JPS63154298A - Dehydrator for sludge and similar substance - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sludge dewatering device, and more specifically,
The sludge to be dewatered is continuously supplied to the apparatus and subsequently transferred to an enclosed sludge chamber space through which a fixed pressurizing plate is passed intermittently, providing means for continuous supply of sludge and means for discontinuously intermittent transfer of sludge. The present invention relates to a dewatering device for sludge and similar substances, particularly waste sludge and manufactured sludge, which has a buffer between the sludge and the like.

[Conventional technology]

Such a dewatering device is disclosed in European Patent No. 006399.
Known by No. 1. In the sieve belt press shown here, the sludge to be dewatered is continuously fed to a substantially horizontal sieve belt. There, the upper sieve belt is moved relative to the lower sieve belt, and these sieve belts are moved along a tortuous path between a number of mutually opposing pressure plates, while the sieve belt is sealed and dewatered. The sludge to be processed is enclosed between the sieve belts. The sludge is dewatered between pressure plates while the sieve belt is stopped. In this case, buffer means are provided, which are arranged between the means for continuous supply of sludge and the means for discontinuous intermittent transfer of sludge, and are provided with an enclosed The sludge chamber space (or sludge chamber volume) is increased by movable roller means while the sieve belt is stopped.

For this purpose, a translational movement is transmitted to suitable rotating rollers in order to increase the length of the sludge chamber space.

[Problem that the invention seeks to solve].

The previously known device has the advantage that, although the sieve belt is moved intermittently, the sludge to be dewatered can be fed continuously to the device. However, on the other hand, the disadvantage is that the damping device provided is relatively expensive in connection with its construction and control means.

It is therefore an object of the present invention to simplify the above-mentioned known device, especially with respect to the damping means, and to make it possible to carry out more effective dewatering.

[Means and Effects for Solving the Problems] The object of the present invention is to provide a buffer means, in accordance with the present invention, to which sludge to be dewatered is continuously supplied and one end thereof communicates with the sludge chamber space. This is achieved by constructing a fixed container that constitutes a preliminary dehydration stage.

By adopting measures such as those described above, particular advantages over the prior art are obtained. First of all, according to the invention, the damping means can be provided without the need for any mechanically movable parts.

When the sludge advancement is stopped and sludge is continuously fed to the dewatering basket, the sludge level in the dewatering basket increases continuously. As soon as the advancement of the sludge in the sludge chamber space continues again, the sludge level in the dewatering basket decreases accordingly. Very large buffer volumes can be provided and appropriate dimensions are selected for the dewatering basket.

Another fundamental advantage obtained by the invention is that the dewatering basket serving as a buffer volume at the same time constitutes a very effective preliminary dewatering stage. While the belt is stopped
The rising sludge level causes the hydrostatic pressure in the dewatering basket to increase, so that the belt stop periods are no longer lost or dead time with respect to the dewatering of the sludge, and the pre-dewatering in the pre-dewatering stage is greatly intensified.

According to a particularly advantageous embodiment of the invention, a filter basket is arranged directly above the filter belt, which filter belt extends substantially horizontally adjacent to the point at which the sludge is transferred, and which extends to one side of the sludge chamber space. stipulate the section. In such an arrangement, the entire hydrostatic pressure of the sludge column in the dewatering basket is applied directly to the filter belt, whereby the pre-dewatering of the sludge is further significantly enhanced.

According to the invention, the preliminary dewatering stage comprises a mixing reaction chamber having a sludge/flocculant inlet for continuously feeding sludge and flocculant into the mixing reaction chamber, and a mixing reaction chamber having a sludge/flocculant inlet for continuously feeding sludge and flocculant into the mixing reaction chamber, and a continuous feeding of sludge from the mixing reaction chamber to the dewatering basket. - means for dewatering the filtrate, the dewatering basket having a vertical cylindrical axis and comprising at least nineteen preferably cylindrical sieve baskets (sieve baskets) serving for hydrostatic dewatering of the sludge; The sieve basket is configured to flow radially through the sieve basket (all 19);
It also has means for collecting and draining the filtrate. In this case, the pre-dewatering stage essentially consists of a mixer for sludge and flocculant followed by a dewatering basket.
It is constructed in combination with a reaction passage interposed in the middle.

According to a particularly advantageous embodiment of the invention, the mixing reaction chamber is defined by a vertical U-shaped tubular body, the sludge-flocculant inlet being arranged at the upper end of the 19 legs of said tubular body; The upper end of the other leg communicates with means for continuously supplying sludge to the dewatering basket. It will be readily appreciated that other mixing means known to those skilled in the art may also be used. If the mixing reaction chamber is U-shaped, its leg in combination with the sludge inlet constitutes the mixing zone, and the other leg in combination with the sludge outlet constitutes the settling zone.

The dewatering basket may include 19 or 2 sieve baskets. If a single case is provided, a vertical sieve basket is provided, the sludge to be dewatered is fed into the interior of the sieve basket, and the filtrate flows out to the outside, is collected there and is drawn off in a suitable manner. The pre-dewatered sludge is removed continuously or discontinuously from the region below the sieve basket and fed to means for its further processing.

However, particularly efficient dewatering is achieved if, according to a particularly preferred embodiment of the invention, two coaxial sieve baskets are provided and the sludge is fed to an annulus located between the two sieve baskets. In this case, the sludge can be dewatered radially inwardly and radially outwardly.

In order to enhance the dewatering action of the dewatering basket and effectively prevent the sieve baskets from becoming progressively clogged, according to the invention means for cleaning at least 19 sieve baskets are provided.

The cleaning means are preferably constituted by a rotating scraper which sweeps the surface of at least 19 sieve baskets and has, for example, a strip-shaped vertical brush in contact with the surface of the sieves.

The special design of the pre-dewatering stage described above makes it possible to obtain a particularly effective pre-dewatering effect of the sludge to be dewatered, thus making it possible to greatly increase the efficiency of the entire device.

According to a further advantageous embodiment of the invention, means are provided between the lower end of the dewatering basket and the sludge chamber space for controlling the speed at which the pre-dewatered sludge is transferred to the sludge chamber space. The control means preferably consist of a controlled or automatically controlled flap valve or a controlled or automatically controlled slip valve. The flap or slide valve automatically controls the speed of the pre-dewatered sludge depending on, for example, the solids concentration in the sludge or other operating conditions.

A particularly simple construction of the entire device is achieved, according to a further aspect of the invention, by extending the sludge chamber space in a straight line between the dewatering basket and the sludge cake discharge station. In this case, the sludge chamber space is preferably defined between a lower rotating filter belt and an upper rotating belt, said upper rotating belt preferably being a pressure belt.

According to yet another aspect of the invention, a belt defining a sludge chamber space extends through a linear horizontal high pressure dewatering zone defined by at least one pair of mutually opposing horizontal stationary pressure plates. In addition, a belt defining the sludge chamber space extends between the pairs of pressure plates, and the pairs of pressure plates are configured to be intermittently movable toward each other to apply dewatering pressure. Preferably, a number of juxtaposed pressurized false pairs are provided.

The lower pressure plate is preferably rigidly mounted on the apparatus frame and configured 114 such that the lower pressure plate is moved into engagement with the lower pressure plate by a hydraulic high pressure generator.

According to a further preferred embodiment of the invention, the pressure plate is preferably opened by spring force. Therefore, when the pressure plate of each month is not pressurized by the hydraulic high pressure generator, it is urged to the open position by the compression spring, and in the open position, the belt defining the sludge chamber space is applied. It is configured to advance between the pressure plates.

Even when the pressurization valve is released, the tightly enclosed sludge chamber space is, according to a further advantageous aspect of the invention, provided with a pair of mutually opposed belts for guiding the belt defining the sludge chamber space. A pressure roller is placed along and secured to the high pressure dewatering zone. Each month's pressure roller is spring biased toward the sludge chamber space. The pair of pressure rollers serves as a low-friction guide for the sludge chamber space and as a sealing compressor for the belt means defining the sludge chamber space, ensuring that the belt means defining the sludge chamber space is sealed and compressed during the transfer phase. Make it.

By providing a sealing ring which rotates about a vertical axis and is driven intermittently in conjunction with the belt means, the sides of the sludge chamber space are sealed adjacent to the high pressure dewatering zone.

In a particularly preferred embodiment, the buffer means constitutes a large-volume pre-drying chamber, the bottom of which consists of a filter belt.
Higher throughput is achieved.

Due to the effective pre-dewatering, the volume has already been reduced by approximately 1/3 at this stage, so that the above design provides a significantly improved throughput.

This is because subsequent parts of the device have to process smaller quantities. When the advancement of sludge in the sludge chamber space is stopped, i.e., while high pressure is applied intermittently by the pressure plate, continuous transfer of sludge to the sludge chamber continues, so that the level of sludge remains constant. The hydrostatic pressure inside the sludge chamber increases.

This means that the pre-draining rate is increased even when the filter belt is stopped during the high pressure phase.

According to a preferred development of the invention, an additional filter surface is provided in the pre-drying chamber, which in particular consists of a fluted sieve arranged in the pre-drying chamber.

With the above design, a volume reduction of 50% can be easily achieved.

In a particularly preferred embodiment of the invention, the preliminary dewatering chamber is followed in the conveying direction by an intermediate pressure stage in which the upper pressure belt runs over the conveyed sludge.

In particular, it is preferred in this case for the pressure belt to consist of a winged belt or a scraper belt, which is provided with a number of protruding transverse webs (vanes) fixed to the belt. In this case, the sludge is treated essentially in batches and no longer advances or retreats during the application of pressure.

It is likewise desirable to provide a filter belt with projecting transverse webs.

In either case, it is desirable that the projecting transverse web is swingable and/or flexible.

In certain embodiments, it may be desirable to have two intermediate pressure stages connected in series.

In particular, it is desirable to support the filter belt and the pressure belt on a number of pressure rollers in a medium pressure stage. In this case, the pressure applied by the pressure roller is preferably variable.

In a particularly preferred embodiment of the invention, the upper and/or lower pressure rollers are each provided with a common mounting on the frame, the mounting being pivotable at one end, and the mounting preventing pivoting to the frame. A pressure generator is provided for the transmission. It will be appreciated that such a configuration constitutes a true intermediate pressure stage due to the ability to apply higher pressures than known intermediate pressure stages. Due to the nature of the discontinuously operated means following the pre-dewatering stage, in each case during the pressurization process in the high-pressure stage, all the areas defining the sludge chamber space during the pressurization process in the high-pressure stage The time the belt is at rest can be used to apply high pressure in the medium pressure stage as well. This can preferably be done by moving a set of pressure rollers, the common attachment of which is mounted on the frame, towards each other by means of a pressure generator. There is virtually no upper limit to the pressure that can be applied. This is because the belt is then stopped and there is no relative movement and there is no risk of high wear on the filter belt. At the same time, the protruding transverse webs provided according to the invention ensure that the sludge cannot revert in a direction opposite to the conveying direction as the pressure increases.

In particular, it is preferable to provide a support bar made of a low-friction material between adjacent pressure rollers. In a particularly preferred embodiment, the support bar is arranged between the pressure rollers so as to face the upper or lower pressure roller, respectively, so that during the pressure step in the intermediate pressure stage, the filter belt and the pressure Uniform support in the plane of the belt is achieved. It is also desirable to spring dampen the support bar.

The pressure generator in the medium pressure stage preferably consists of a hydraulic cylinder which can be operated during pressure crawling in the high pressure stage, ie during belt rest.

According to a particularly preferred development of the invention, the high-pressure stage is designed in such a way that the filter belt rests on a plate with a filtrate groove open at the top and provided on a lower fixed pressure plate.

It may be desirable to provide an additional pressure roller projecting through an opening on the surface of the plate. The plate is preferably made of low friction plastic or rubber. This development of the invention makes it possible to eliminate the co-rotating support belts used in known devices. This is because the provision of support belts has been found to be desirable in practice, particularly in high pressure zones. In the above embodiments of the invention, the fixed support belt section is substantially mounted on the high pressure stage, whereby significant structural and operational savings may be achieved. The above configuration can be employed because the relative movement of the plate and filter belt that is formed as the filter passes takes place in the high pressure zone only when the high pressure stage is opened.

It will be appreciated that in a variant of the invention, the filter belt can be supported on a co-rotating support belt having an open-topped filtrate groove extending at an angle to the conveying direction. Will.

In some embodiments of the invention, the vaned belt extends through the locking chamber until it enters the intermediate pressure stage, ie, on the way between the dewatering chamber and the intermediate pressure stage. This locking chamber prevents the sludge, which is still relatively liquid in this region, from moving in a direction opposite to the direction of movement of the vaned belt.

The locking chamber is preferably defined by a surface portion spaced apart from and opposite the winged belt, said surface portion being in contact with the free upper edge of the projecting transverse web. As a result, there is a constant sealing between the pre-dehydration chamber and the intermediate pressure stage by at least 19 protruding transverse webs.

Further advantageous aspects of the invention are, in connection with the following description:
It will be clear from the other dependent claims than those described above.

The means provided according to the invention constitute a high-pressure dewatering zone and have the advantage of having a particularly simple mechanical structure, high stability and the most effective dewatering action. The reduction in sludge volume due to pre-dewatering allows continuous transport of the sludge despite intermittent discharge of the dewatered sludge cake.

The basic characteristics of the dewatering equipment are that the pre-dehydrated sludge is
It is seen moving along a straight horizontal parallel path from adjacent to the pre-dewatering stage to the sludge cake discharge station.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The dehydration device includes a preliminary dehydration stage 100. Following this, in the sludge transport direction A, there is a wedge-shaped dewatering stage 200, followed by a high-pressure dewatering zone 300.

The preliminary dehydration stage 100, as shown in particular in FIGS. 1 and 4, has as its basic components a mixing reaction chamber 102 and a dehydration basket 104 communicating with the mixing reaction chamber 102.
including. The mixing reaction chamber 102 includes a vertical U-shaped tubular body 1
06, and in the illustrated embodiment the height 1
It has a length of 60 cm and a width of 100 cm. One leg 108 of the tubular body 106 is provided with a tubular inlet section 110, which feeds the sludge to be dewatered, premixed with chemical additives, in particular flocculants, into the tubular body 106 via metering means 112.
06. An automatically controllable gear motor 114 is flanged to the top end of the leg 108 and is connected to the leg 1 adjacent the tubular inlet section 110.
08 to drive an agitation wheel 116 which provides effective mixing of the sludge and flocculant. For this reason,
The space defined by the legs 108 is the mixing and stirring zone 11
It may be written as 8.

The other leg 120 of the U-shaped tubular body 106 has a zone 118
allows the agitated medium to settle, thus defining a so-called settling zone 122.

The top end of the leg 120 of the U-shaped tubular body 106 terminates at the level of the inner bottom surface of the tubular inlet portion 110 and communicates with a channel system 124 that is open at the top. The system enters the tubular body 1 via the tubular inlet section 110 after flocculant addition.
Receive free overflow of sludge fed to 06.

The sludge to be dewatered is fed via a flow system 124 to the dewatering basket 104, which comprises two vertical coaxial sieve baskets 130.degree. 131 with vertical axes and a height of approximately 150 cm. The sludge to be dewatered passes through the channel system 124 to the sieve baskets 130, 131.
It is guided to an annular portion formed between the two. Due to the increase in the hydrostatic pressure of the suspension, the sieve basket 130 is moved inwardly in the case of the internal sieve basket 130 and outwardly in the case of the external sieve basket 131.
, 131, the sludge is dewatered. A collection trough 132 is provided at the lower end of the sieve baskets 130, 131 and extends around the sieve basket 131 for receiving and collecting filtrate through the sieve mesh.

A similar collection trough 1 is provided inside the internal sieve basket 130.
34 is provided inside for receiving the dehydrated filtrate.

The collected IX fluid is drained via a drain line communicating with the collection trough.

Sieve baskets 130, 131 are preferably made of steel and have a suitable dewatering structure. These can in particular consist of fluted sieves. A cloth 136 is provided on the outside of the sieve basket 131 and is fixed to the channel system 124 to serve as a splash protection. The lower end of cross 136 is located inside collection trough 132.

A cleaning means 138 is arranged inside the sieve basket 130 and has four vertical vanes 142 extending radially outwardly and having inner and outer vertical edges. Banded brans are secured to the inner and outer edges and are in contact with the inner surface of the sieve basket 131 and the outer surface of the sieve basket 130.

Each vane 142 is simultaneously driven by a gear motor 146 flange mounted on the top of the sieve baskets 130,131. The rotating cleaning means 138 is the sieve basket 13
Activate filter plane 0,131. That is, the deposited solids are continuously swept away, thereby keeping the sieve mesh open. Vanes 14 extending in the radial direction
2 are formed with a plurality of circular openings 148, distributed over the height of the vanes, and forming sludge baffles.

The base of the U-shaped tubular body 106 is connected to the space located below the sieve basket 1.30, 131 by a pipeline 154, which pipeline is configured to be closed by a slide valve. As a result, the tubular body 1
06 can be easily emptied if needed.

As can be seen in particular from FIGS. 1 and 2, the dewatering basket 104 is located on top of belt means, generally designated 202, the construction of which will be described in detail below. As is particularly apparent from FIG. 2, the space 204 between the bottom end of the dewatering basket 104 and the facing side of the lower belt means 202 is such that the pre-dewatered sludge coming out of the dewatering basket 104 is on the left side in FIG. The sides are sealed by sheet metal elements 206 so that there is no leakage to the sides or to the sides and transport in the direction of arrow A by belt means 202 is possible.

The sealing plates 206 extend on both sides of the belt means 202 to the discharge end of the wedge-shaped dewatering stage 200 or to the receiving end of the high pressure dewatering stage 300. A top cover plate 208 follows the dewatering basket 104 on the right side in FIGS. 1 and 2 so that the pre-dewatered sludge is directed within a closed passageway 210.

A wedge-shaped dehydration stage 200 is installed in the sealed passageway 210.
A flap valve 158 is arranged between the dewatering basket 104 and the dewatering basket 104 to completely close the passage 210 or to completely or partially close the passage 210, depending on the operating mode of the plant and the liquid concentration of the pre-dewatered sludge. Open or
Can be used selectively. The interior of the passageway 210 is accessible from the outside through a hinged inspection lid 159 located on the top of the flap valve 158.

The pre-dewatered sludge flowing through passage 210 is
Entering a wedge-shaped dewatering stage 200, disposed therein is an upper belt means generally designated 212, which upper belt means moves synchronously with the lower belt means 202 to form a wedge-shaped tapered dewatering space. It extends at an acute angle with respect to the lower belt means 202 so as to be shown.

The side seals adjacent to the wedge-shaped dewatering stage 200 are constituted by sheet metal elements 206 arranged on the sides. After the wedge-shaped dehydration stage 200 is a high-pressure dehydration stage 300.
continues, which will be explained in detail later.

The lower belt means 202 includes an endless filter belt 214 running around two pivoting pulleys 216, 218 and extending in a substantially horizontal straight line between these pulleys. The filter belt 214 is supported by a support belt disposed inside and rotating in unison with the filter belt 214 and pivoting pulleys 220,
222 and is provided with suitable dewatering structures such as channels, grooves, etc. for the removal of filtrate, and is therefore described as a grooved belt 224. Lower belt means 202
The lower stroke of is supported by a support roller 226. The upper stroke of the lower belt means 202 is supported adjacent to the pre-dewatering stage 100 and the wedge-shaped dewatering stage 200 by a chain link belt 228 which rotates in unison with the lower belt means 202; It runs around two pivoting pulleys 230, 232 inside a closed loop formed by a grooved belt 224.

In this embodiment, the upper belt means comprises a smooth pressure belt 212. From a pivot pulley 234 located close to the inspection lid 159, the upper pressure belt is inclined downward in the direction of arrow A and extends to a pivot pulley 236 opposite to the pivot pulley 232. ing.

Thereafter, the pressure belt 212 is parallel to the lower belt means 202 up to the turning roller 238, which is opposed to the turning pulley 222 and defines the rear end of the high pressure dewatering stage 300. Pressure belt 212
is then rotated upward and further passes through rotating rollers 240 to 250 to reach a rotating pulley 234.

The pressure belt is supported in the wedge-shaped dewatering stage 200 by another chain link belt 254, which rotates with the pressure belt 212 and runs around the pivot pulleys 234, 236.

In the high pressure dewatering stage 300, the sludge chamber space is sealed on its sides by endless seal rings 256, 258 located on both sides of the sludge chamber space and rotating with the belt means 202, 212. The sealing rings 256, 258 run around rotating rollers 260-266 having vertical axes of rotation, so that the sealing rings 256, 258, as seen in particular from FIG.
．． 258 rotates along a horizontal trajectory. Seal ring 2
A number of support rollers 268 are provided to support the outer return portion of 56,258 (see especially FIG. 3).
.

As is clear, in the high pressure dehydration stage 300,
The top and bottom of the sludge chamber space 270 are provided by upper belt means 212 and lower belt means 202, respectively.
Both sides are also surrounded by co-rotating seal rings 256, 258.

In the high pressure dewatering stage 300, the sludge chamber space 2
70 extends through a number of fixed pressure plate pairs. Each of said pairs is fixedly attached to a lower pressure plate 2
72 and a vertically movable upper pressure plate 274, which is directly opposite the lower pressure plate 272. A clamp-like frame 276 is combined with six pairs of pressure plates 272, 274.

As previously mentioned, each lower pressure plate 272 is connected to the frame 276.
is fixedly mounted on the lower cross member 278 of the.

Two hydraulic cylinders 282 are fixed to both sides of the upper cross member 280 of the frame 276, each having a piston 284. Each piston 284 operates vertically downward and cooperates with the upper pressure plate 274 to bring it under high pressure when the sludge in the sludge chamber space between the pressure plates needs to be dewatered under high pressure. lower pressure plate 27
Push down toward 2.

The resulting pressurizing force is maintained within the frame system and does not exert any load on the foundation (floor surface).

As is particularly clear from FIG.
Each of the arms 286 is provided on each side of the front and rear ends thereof, and the arms extend outwardly on the plane of the pressure plate, and the arms 286 extend outwardly on the plane of the pressure plate, and the arms 286 extend outwardly on the plane of the pressure plate. A compression spring 288 is maintained in a compressed state between the opposing arms of. At the end of the pressing operation, the compression spring 288 automatically lifts the upper pressure plate 274 from the lower pressure plate 272 so that the belt means can advance thereon. The lower and upper belt means are guided by a pair of pressure rollers 290, 292 facing each other.

In the illustrated embodiment, eight pairs of pressure rollers are provided for each pair of pressure plates. The pressure rollers extend into corresponding openings 294 in the pressure plate. The six pairs of pressure rollers 290.degree. 292 are biased toward each other by suitable spring members 296. This ensures that even when the upper pressure plate 274 is lifted, the sludge chamber space remains sealed under the pressure applied by the pair of pressure rollers.

After the high-pressure dewatering stage 300, the dehydrated sludge cake is discharged in the direction of arrow B. A scraper 258 is provided adjacent to the rotating roller 238 and serves to clean the pressure belt 212. Adjacent to the pivoting pulley 218 there is provided another scraper 302, immediately followed by a cleaning brush 304, also followed by a cleaning nozzle 306, serving to clean the filter belt.

During plant operation, sludge and flocculant are continuously fed to the mixing reaction chamber 102. The sludge passes through the flow path system to the two sieve baskets 130 and 13 of the dewatering basket 104.
overflow freely into the annulus between 1. Filtrate flows inwardly and outwardly from the annulus and is collected and discharged by collection troughs 132,134.

The sludge in the annular portion flows through the annular portion and continuously delivers four liquids. The bottom of the annulus is defined by a horizontal filter belt 214, which is positioned close to the filter belt so that the total hydrostatic pressure is effective as filtration pressure. A flap valve 158 located at the outlet of the pre-dewatering stage controls the flow of sludge into the wedge-shaped dewatering stage 200. The successive reduction in sludge volume in the pre-dewatering stage and the wedge-shaped dewatering stage is due to the removal of filtrate, so that the volume of sludge entering the high-pressure dewatering stage 300 is only 20% of the original volume, depending on the nature of the sludge. ~30%. This means that the volume has been reduced by 1/3 to 1/4.

Sludge supply, sludge transfer and dewatering in the pre-dewatering stage and the wedge-shaped dewatering stage are carried out continuously. Transfer to the high-pressure dehydration zone and dehydration in the high-pressure dehydration zone are performed intermittently. When the filter belt is stopped during dewatering in the high pressure dewatering stage, the annulus volume within the dewatering basket 104 in the pre-dewatering stage 100 serves as a sludge buffer. Meanwhile, all pressure elements in the high-pressure dewatering stage, such as pressure plates and hydraulic cylinders, are fixed in place on the machine so that they do not move with the filter belt, which accommodates an adjustable dewatering period. It advances only in timing, and the increase or decrease in its advance corresponds to the length of the high-pressure dehydration stage.

The sludge dewatered by the high-pressure dewatering stage is discharged from the machine, while the high-pressure dewatering stage is filled with sludge entering from the wedge-shaped dewatering stage. As a result, the sludge level in the dewatering basket of the pre-dewatering stage decreases and rises again during the dewatering period in the high-pressure dewatering stage.

With a timed pressure responsive relay, the pressure application in the high pressure dewatering stage can be adjusted in terms of the amount of pressure applied and the time of pressure application.

The length of the high pressure dehydration stage can be varied as required. In addition, the entire length of the high-pressure dewatering stage can be divided into several mechanical parts, for example for performing high-pressure dewatering, washing, re-drying, blowing with compressed air, etc.

The dewatering apparatus according to the invention, which is schematically depicted in FIG. and a final high pressure stage 5.

The embodiment shown schematically tall in FIG. 5 has two endless filter belts 6.7. The lower filter belt 6 is rotated counterclockwise within the intermediate pressure stage 4 and the high pressure stage 5 which apply a slightly higher pressure, while the upper filter belt 7 is rotated clockwise across all four stages mentioned above. I'm being forced to do it.

The upper filter belt 7 is associated with a plurality of transverse webs 8, which will be described in detail below, spaced regularly from the belt 7 and projecting perpendicularly from the belt surface.

In the embodiment shown in FIG. 5, the filter belts 6 and 7 consist of two synchronously rotating combinations having a plurality of grooves (not shown) opening on the sides facing these belts. They are supported by support belts 9a and 9, respectively.

Furthermore, two rotary seals 10.11 are provided for laterally sealing the sludge chamber formed by and between the filter belt 6.7.

Said first intermediate pressure stage 3 applying low pressure comprises another endless rotating heald 12 having a plurality of rows of webs projecting perpendicularly from the belt surface.

This belt 12 rotates clockwise and combines with the filter belt 7 to form a first wedge-shaped pressurizing chamber 13 .

The pre-dewatering stage 2, shown diagrammatically in FIG. and a large-capacity preliminary dehydration chamber 15 that serves as a buffer between the The bottom of this preliminary dehydration chamber 15 has a plurality of webs 8 protruding perpendicularly from the belt surface.
The rotating belt 7 is supported by the combined support belt 9. Bottom 1 of preliminary dehydration chamber 15
6, since the upward slope of the plurality of support rollers 17 supporting the combined support belt 9 continues to the entrance of the first intermediate pressure stage 3 that applies low pressure, the slope gradually rises and slopes toward the sludge conveyance direction. ing.

The pre-dewatering chamber 15 is shown to contain further filter surfaces 18 for separating the filtrate from the sludge solids. In this preferred embodiment, the filter surface 18 consists of a plurality of slotted and steeply sloped sieves 19 placed in the pre-drying chamber 15 .

High-efficiency pre-dewatering necessarily results in a considerable volume reduction, since a minimum volume reduction of one-half to one part is required to be passed from the inlet of the first intermediate pressure stage 3 to beyond.

In this first intermediate pressure stage 3, an upper bladed belt 12 having a plurality of webs 8 protruding perpendicularly from the belt surface is provided on the filter belt 7 as shown in the figure. The respective protruding webs facing each other overlap and the sludge is packed and conveyed into the respective sections in the wedge-shaped pressurizing chamber 13.

At the outlet of the first intermediate pressure stage 3, the filter belt 6
is combined with and supported by said combined support belt 9a.

The intermediate pressure stage 4, which applies a slightly higher pressure, is likewise operated by the filter belt 6 and another filter belt 7, which has an associated support belt 9 and overlays the belt 6 in this intermediate pressure stage 4. , and a wedge-shaped pressurizing chamber 22 formed between these two belts, and in this intermediate pressure stage 4, the filter belt 7 and the combined support belts constitute one pressurizing belt device. There is.

In the intermediate pressure stage 4, the filter belt 6 and the combined support belt 9 are supported by a number of pressure rollers 23 that are juxtaposed close to each other and are movably provided on a common equipment frame 24. . The filter belt 7 is provided above the wedge-shaped pressurizing chamber 22 and has a plurality of webs 8 protruding perpendicularly from the belt surface,
It is also provided on one common mounting frame 26 and moved along a number of pressure rollers 36 lying above.

The invention will now be described in more detail in connection with the more detailed cross-sectional views shown in FIGS. 6 and 7. The pressure exerted on the sludge in the wedge-shaped pressure chamber 22 by the combined support belt 9 and the two filter belts 6.7 through the pressure roller 25 is varied. This is because at least one of the tubing frames 24 and 26 is pivotally mounted, and a plurality of pressure generators are provided to bias the pivotally mounted frame relative to the other frame.

A similar design may be adopted for the first intermediate pressure stage 3 applying low pressure. In this case, the means for mounting the two pivot pulleys 27 and 28 are pivotally mounted under pressure.

As can be seen in FIG. 5, two support bars 29 and 30 made of or coated with a low-friction material are placed in the two tube frames 24 and 26 between the respective pressure rollers 23.25. roller 23.25
is placed parallel to.

The support bar 29.30 supports the pressure roller 23.25.
On the other hand, the lower support bar 29 is provided to overlap the upper pressure roller 25, and the upper support bar 30 is provided to overlap the lower pressure roller 23.

Because of this design, as previously discussed, the pressure applied when each belt is stopped will necessarily create a highly uniform pressure application surface on both sides of the sludge.

It is desirable to apply a resilient cushion to the support bar 29,30.

Before providing a more detailed explanation shown in the cross-sectional views of FIGS. 6 and 7, the operating mode of the dewatering apparatus of the present invention having the above configuration will be briefly described below.

The apparatus of the present invention is operated intermittently as described above, and its cycle time is determined by the amount of time the sludge volume exists in the high pressure stage. The sludge undergoing dewatering is continuously fed to the pre-dewatering chamber 15 through a mixing reaction unit, indicated generally at 31. The feed sludge also undergoes continuous dewatering via the bottom consisting of the filter belt 7 and the slotted sieve 19. This dehydration is assisted by the water pressure that prevails inside the pre-dehydration chamber 15. If the filter belts, i.e. the pressure belts and the vaned belts, are initially stopped, then during the next opening stroke of the high pressure stage 5, they are moved forward by a distance corresponding to the width of the high pressure stage. If so, the part of the filter belt 7 that previously constituted the bottom of the pre-drying chamber 15 is moved to the first intermediate pressure stage 3 for being subjected to a low pressure during the next opening stroke of the high pressure stage 5. . In the first intermediate pressure stage 3 where a low pressure is applied, the sludge is further dewatered under intermediate pressure in a wedge-shaped pressurizing chamber 13 by means of a vaned belt 12 mounted on the filter belt 7 . At the same time, the two filter belts 6 and 7 are moved into the wedge-shaped pressurizing chamber 22 of the intermediate pressure stage 4 for applying a slightly high pressure, so that the wedge-shaped pressurizing chamber 1
The sludge previously stored in the wedge-shaped pressurizing chamber 22 is transported to the wedge-shaped pressurizing chamber 22 of the intermediate pressure stage 4, which applies a slightly high pressure, and the sludge that was previously stored in the wedge-shaped pressurizing chamber 22 is transferred to the high-pressure stage 5. be moved inside.

When each belt has been advanced a distance corresponding to the width of the high-pressure stage 50, the dewatering apparatus of the present invention is again stopped, and also while the continuous supply of sludge into the pre-dewatering chamber 15 continues. Q preparations are made for the pressure stage.

During the pressing phase, each belt is stopped and the contained sludge in the high pressure stage 5 is subjected to the action of a plurality of pressing plates, as will be explained in detail below.

In any case, when each belt is stopped,
A plurality of pressure generating devices provided in the illustrated embodiment are used simultaneously to apply pressure to the upper mounting frame 26 within the intermediate pressure stage 4. As a result, the sludge contained within the wedge-shaped pressurized chamber 22 is subjected to a strong dewatering effect under pressure.

In said first intermediate pressure stage 3, another additional pressure can be applied simultaneously by the optional vaned belt 12.

During the pressurization phase, each seal 10.11 on the side of the device prevents lateral leakage of the sludge undergoing dewatering under pressure.

After the high pressure stage 5, the dewatered sludge cake is thrown out in the direction indicated by arrow 32 in the figure. Each belt is then cleaned by scraping and cleaning means shown diagrammatically in FIG. During sludge discharge, each part of the sludge to be dewatered is pre-treated in preparation for the next pressurization stage.
E 3 Proceed to stages 2, 3.4 and 5 respectively.

Details of the preliminary dehydration chamber 15 and the high-pressure stage 5 provided below it become clear from the first folded surface of FIG. It can be seen that in the pre-drying stage 2 the rotating seals 10.11 extend outside the side walls 33, 34 of the pre-drying chamber 15.

From this cross-sectional view, it can be seen that a plurality of webs 8 projecting perpendicularly from each belt surface are secured to a separate rotating web belt 61 rotating in unison with rotating seals 10.11, and that adjacent to the pre-dewatering stage are Both sides 33 of the dehydration chamber 15.
It can be seen that it extends into the interior of 34. The web belt 61 consists of two rotating rubber bands 62, 6 to which are fixed protruding webs 8 perpendicular to the longitudinal direction of the belt.
It consists of B. This same design is also used in the two embodiments shown in FIGS. 10 and 11.

In the cross section shown in FIG. 5, the web belt 61
It can be seen that the water enters the preliminary dehydration chamber 15 along the rear wall surface 64 separated from the filter belt 7.

In the high pressure stage 5, each part of the sludge placed between each protruding web 8 is connected to a first belt pair of a filter belt 7 and an associated support belt 9 behind the filter belt, and to the other lower filter belt 6. It is placed between its associated support bell h9a and the second pair of belts. The lateral binding of each sludge portion is achieved by a rotary seal 10.11 which is press-fitted between the two filter belts 6.7 in said area.

The high pressure stage 5 consists of a number of stationary pressure plate pairs, each pressure plate pair consisting of a fixed lower pressure plate 35 and a reversely movable lower pressure plate 36. - set of hydraulic cylinders 3;
7.38 is combined with each upper and lower pressure plate pair 35.36, and the lower pressure plate 35 holds the upper pressure plate 36 stationary.
It acts to bias against. Lower pressure plate 35
are attached to three frames.

Each pair of upper and lower pressure plates 35 and 36 has a set of springs 40.41 acting between them to open the high pressure stage 5 when the hydraulic cylinder 37.38 is released.
It is combined with These springs 40,41 raise the upper pressure plate 36 from the lower pressure plate 35 when the pressure stroke ends. This set of springs 40, 41 automatically raises the lower pressing plate 36 when the pressing operation is completed, allowing the belt means to advance. The lower belt means consisting of the filter heald 6 and its associated support bell h9a is guided by a number of pressure rollers 42, four of which are connected to each lower pressure plate 35.
It extends into a corresponding opening 43 in the lower pressure bell 35 and projects above its surface. These pressure rollers 42 are movably mounted on suitable spring elements 44 located within the openings 43.

The above configuration enables the following. That is, when the high-pressure stage 5 is opened, the belt means 6.7 is raised steadily. As a result, the friction of the lower pressure plate 35 during advancement of the belt means can be reduced.

The outermost pressure roller 42 has two belt means 6.7
The synchronous rotating seal 10.11 is placed exactly in position between the two. Thereby, the additional pressure applied by the pressure roller 42 acts on the side seal even at the beginning of the pressure cycle.

Details of particularly preferred embodiments of the intermediate pressure stage 4 can be found in Section 7.
This becomes clear from the cross section of the figure. Regarding this detail, attention should be drawn to the above description.

The configuration of intermediate pressure stage 4 is similar to that of high pressure stage 5. A rather high pressure is applied to the sludge portion contained in the wedge-shaped pressurizing chamber 22 when the belt means is stopped. For this purpose, a plurality of hydraulic cylinders 45 are provided on both sides of the mutually opposing lower pressure rollers 23 . In the illustrated embodiment, a plurality of lower pressure rollers 23 are coupled to a stationary mounting frame 24 that is placed on a lower frame 46 . Meanwhile, the plurality of upper pressure rollers 25 are movably mounted on a movable mounting frame 46 that is vertically movable by the hydraulic cylinder 45. In another alternative configuration, each pressure roller 2
5 can be made individually movable by one hydraulic cylinder.

A plurality of compression springs 47 are held horizontally in a compressed state between the respective mounting frames 24 and 26, and when the pressurizing operation of the dewatering device is completed, the upper mounting frame 2
6 and the lower pressure roller 25 are automatically lifted. This prevents a somewhat high pressure from acting on the sludge when the belt means moves forward.

FIG. 8 shows another particularly preferred embodiment of the invention, with a cross section similar to that of FIG. Reference numerals similar to those in FIG. 5 are used for similar parts and cross-sections having the same function. The embodiment of FIG. 8 is even simpler than the embodiment of FIG. 5, having only a single intermediate pressure stage to provide a slightly higher pressure.

As is clear from FIG. 8, the intermediate pressure stage 4 is adjacent to the pre-dehydration stage 2. The entire device comprises one filter belt, one pressure belt 70 with a plurality of protruding webs perpendicular to the belt's longitudinal direction, and two rotating seals.

In the apparatus illustrated in FIG.
When moving from to intermediate pressure stage 4, a plurality of webs 8
A pressure belt 70 comprising a plurality of vanes extends initially into a pressure lock chamber, designated generally at 48, and under the action of hydraulic pressure prevailing within the pre-dewatering chamber 15, the vaned belt 70 The movement of the sludge in the preliminary dewatering chamber 15 in the direction opposite to the conveying direction of the sludge 12 is prevented.

Said pressure lock chamber 48 is formed by four surfaces facing and remote from the vaned belt 12 and always in contact with the respective free tip 50 of each web 8.

As a result, as can be seen in FIG. 8, this pressure locking chamber 48 is constantly sealed by at least one chamber located between two webs in each case during a clockwise movement of the winged belt 12.

Next, the following becomes clear from the cross section of FIG. That is, the bottom 16 of the preliminary dehydration chamber 15 is formed only by a pressure belt 70 supported by a plurality of rollers 17 and having a plurality of protruding webs 8 . Also, due to the special design of the high pressure stage, which will be explained in more detail below, support belts are not equally required. In the embodiment shown in FIGS. 8-12, a plurality of synchronously rotating seals 10.
11 can be seen extending to the outside of both walls 33, 34 adjacent to the pre-dehydration chamber 15. According to FIG. 9, a special embodiment is shown. i.e. rotary seal 10.11
The upper passage course of each extends into a filtrate discharge trough 51 or 52 and into a plurality of floats above the filtrate carried into the trough. The filtrate discharge tubs 51 and 52 are the preliminary dehydration chamber 1.
It is fixed to both side walls 33 and 34 of 5.

Adjacent to the preliminary dehydration chamber 15, the both side walls 33 and 34 are
These walls 33.34 are sealed from the pressure belt 70 by two seals 53.54 which contact the pressure belt 70 at their lower ends.

Figure 10 shows the line ■- in Figure 8 at intermediate pressure stage 4.
It is a cross-sectional view along ■. It can be seen from this figure that the stages are similar to that shown in FIG. 7, and like reference numerals used therein indicate parts having the same function as described above. However, they differ in the following points. That is, the vaned belt 12 having a plurality of protruding webs 8 is used as one pressure belt 70 within the intermediate pressure stage 4. Also in this embodiment, each projecting web 8 is pivoted to the winged belt 12 or is flexible.

FIG. 11 is a cross-sectional view taken along the line ■--■ in FIG. 8 regarding the plane of the high-pressure stage 5.

In the preferred embodiment of the high pressure stage 5 shown in FIGS. 8-12, a plurality of support straps are provided on each lower stationary pressure plate 35 to support the filter belt 6 and to support the upwardly directed filtrate grooves 56. Plate 55 formed by
has been replaced by

Furthermore, we know the following: That is, the plurality of pressure rollers 42 not only pass through each opening 43 in each pressure plate 35 but also protrude through each opening 57 in the plate 55. When the high pressure stage 5 is opened, the spring element 44 or the pressure roller 42 is caused to directly lift the filter belt 6. Thereby, the sludge cake can be discharged with low friction. Regarding the details of FIG. 11, attention should be paid to the foregoing description, particularly in connection with FIG. 6.

FIG. 12 is a top plan view of another specific example of the dewatering device of the present invention, viewed from the direction of the arrow {circle around (2)} in FIG. 8. Only part of the apparatus is shown, namely the pre-dehydration stage. The structure of each part of the slotted sieve 19 and the mixing reaction unit 31 is made clear from FIG.

FIG. 13 is a schematic side sectional view showing details of the intermediate pressure stage 4, including a hydraulic cylinder 45, a pressure roller 23.25,
The connection state of each spring element 44 for the support bar 29, 30 is also shown in detail.

FIG. 14 is a schematic longitudinal sectional view corresponding to FIGS. 5 and 8 and showing yet another embodiment of the dewatering device 1 according to the invention, and similar references used therein. The reference numerals indicate the same parts having the same function and used for the two specific examples described above.

In the embodiment shown in FIG. 14, the bottom 16 of the pre-dewatering stage 2 has two first and second sections 58.
It is divided into 59 parts.

A dewatering box 60 having a large area is placed below the first section 58 on the negative side in the sludge conveyance direction. The dewatering box 60 supports the filter belt 7 within this first section 58. The first section 58 of the bottom 16 of the preliminary dewatering stage 2 is located at the lowest point 6 of the preliminary dewatering bead 15.
It is descending towards 1. This lowest point 61 is located substantially below a plurality of additional filter surfaces 18 made up of a plurality of sieves 19 with narrow grooves.

A second section 5 following the conveying direction of the filter belt 7
9 slopes upward to a bending point 62 which connects to the inlet 2° to the intermediate pressure stage 4. Regarding other details, attention is drawn to the above description.

FIG. 15 shows a modification (first modification) of the third specific example of the dewatering apparatus of the present invention shown in FIG. 14. Since the same symbols as those used in Fig. 14 are used, the 15th
Regarding the variants of the figures, it will be understood without further explanation.

It should be noted that for the sake of clarity, the hydraulic cylinders 37, 38 and 45 have been omitted in FIGS. 14 and 15.

Similar to FIGS. 14 and 15, FIG. 16 shows yet another modification (second modification) of the dewatering device 1 of the present invention. The essential differences between this second modification and other specific examples are as follows. That is, preliminary dehydration chamber 1
5 is the first dehydration section 15 and the second dehydration section 15
This is the point where it is divided into A and A. Second dewatering section 1
5A directly precedes the entrance to intermediate stage 4. Regarding other design aspects, the second variant of FIG. 16 is similar to the embodiment of FIG. 5, so that reference is made to the above description made with respect to FIG.

FIG. 17 shows a particularly simple example of the dewatering apparatus of the present invention. In this specific example, the rotary seal 10
．． 11, only one filter belt 6 without webs 8 and one pressure belt 70 with said webs 8 are used. The high pressure stage 5 is also provided with a plate 55 formed with a filtrate groove 56 as shown in FIG. Therefore, for details of this specific example, please refer to the explanation regarding the specific example in FIGS. 8 and 9.

The following is common to each of the specific examples described with reference to the figures from FIG. 5 to FIG. 17. That is, in the preliminary dewatering stage, sludge supply, sludge transport, and sludge dewatering are performed continuously, while sludge transport and dewatering in the intermediate pressure stage and high pressure stage are performed intermittently. This is the point. At the pre-dehydration stage, a large-capacity pre-dehydration chamber 15
However, each filter belt acts as a buffer when it is stopped during dewatering in the high pressure stage. Furthermore, since in any case each belt is stopped during dewatering in the high pressure stage, in each embodiment that dewatering time is utilized for increasing the pressure in the intermediate pressure stage. Furthermore, as in the intermediate-pressure caste and the high-pressure stage, all pressure-applying and pressurizing elements, such as pressure membranes and hydraulic cylinders, are kept stationary. That is, the elements do not move with each filter belt, and only the filter belt means are advanced by a period corresponding to the variable dewatering period and an increment comparable to the length of the high pressure stage. Also, when each hydraulic cylinder is released, the dewatered sludge in the high pressure stage is discharged from the high pressure stage and discharged as a sludge cake. At the same time, the high pressure stage is filled with fresh sludge from the intermediate pressure stage. The amount of sludge in the pre-dewatering chamber is such that it increases when each belt is stopped and decreases when sludge fills both the intermediate and high pressure stages.

The foregoing description is merely illustrative of some preferred embodiments of the invention and is not intended to limit the scope of the invention. Many further variations and modifications of the present invention will readily occur to those skilled in the art without departing from the scope of the invention.

[Brief explanation of the drawing]

FIG. 1 is a sectional side view showing a schematic configuration of an embodiment of the dewatering device according to the present invention, FIG. 2 is a top view of the device shown in FIG. 1,
Figure 3 is a sectional view taken along the line III-I in Figure 1, and Figure 4 is an arrow ■
FIG. 5 is a schematic vertical cross-sectional view showing the first embodiment of the dewatering apparatus according to the present invention, and FIG. FIG. 7 is an enlarged sectional view taken along line -■, FIG. 7 is a schematic enlarged sectional view of FIG. 5, and FIG. 8 is an enlarged sectional view taken along line -■. A schematic diagram similar to
Fig. 9 is an enlarged vertical cross-sectional view taken along the schematic line ■-V of Fig. 8, Fig. 10 is an enlarged vertical cross-sectional view cut along the schematic line Vl-Vl of Fig. 8, and Fig. 11 is an enlarged vertical cross-sectional view taken along the schematic line Vl-Vl of Fig. 8. Outline of Figure 8 -
■An enlarged vertical cross-sectional view cut along the line; Figure 12 is an enlarged top view taken from the direction of the arrow ■ in Figure 8 showing the area of the pre-dehydration chamber; Figure 13 is an enlarged view showing details of the medium pressure stage section. figure,
14 to 17 are fifth diagrams showing various embodiments of the present invention.
It is a schematic configuration diagram similar to the figure. 1 is a dehydration device, 2,100 is a preliminary dehydration stage, 3, 4
, 200 is a wedge-shaped dehydration stage, 5° 300 is a high-pressure dehydration stage, 6 and 7 are filter belts, 8 is a web, 9,
9a is a support heddle, 102 is a mixing reaction chamber, 104 is a dehydration basket, 106 is a U-shaped tubular body, and 130 is a sieve basket. Outer 1: Albert, Bale

Claims (1)

[Claims] (1) Sludge to be dewatered is continuously supplied to the device,
Subsequently, the sludge is transferred to an enclosed sludge chamber space through which a fixed pressurizing plate is passed intermittently, and the sludge and Apparatus for dewatering similar materials, in particular waste sludge and production sludge, in which the buffer means consist of a stationary container (15, 104), to which the sludge to be dewatered is continuously fed, and one end of which A preliminary dehydration stage (270) communicating with the sludge chamber space (270)
2, 100). (2) The buffer means has a lower end portion that is connected to the sludge chamber space (27
2. Device according to claim 1, characterized in that it consists of a dewatering basket (104) communicating with the dewatering basket (104). (3) having a filter belt extending substantially horizontally adjacent the point at which the sludge is transferred and defining one side of the sludge chamber space, the filter basket (104) being directly above the filter belt (214); 3. The device according to claim 2, characterized in that it is arranged in a. (4) A mixing reaction chamber (102) having a sludge/flocculant inlet (110) for continuously supplying sludge and flocculant to the mixing reaction chamber (102);
means for continuously feeding the dewatering basket (104) from the dewatering basket (102);
4) comprises at least one preferably cylindrical sieve basket (130) having a vertical cylindrical axis and serving for hydrostatic dewatering of the sludge, the filtrate passing through the dewatering basket (104);
13, characterized in that it is configured to flow radially therein through at least one sieve basket (130) and has means (132, 134) for collecting and discharging the filtrate. The device according to paragraph 2 or 3. (5) The mixing reaction chamber (102) is a vertical U-shaped tubular body (1
06) and the sludge/flocculant inlet (110
) is arranged at the upper end of one leg (108) of the tubular body (106) and the upper end of the other leg (120) of the tubular body (106) continuously transports the sludge into the dewatering basket (104). Device according to claim 4, characterized in that it is in communication with means (124) for supplying. (6) the top end of the other leg (120) is such that, with respect to the dewatering basket (104), sludge exiting the top end of the other leg (120) freely overflows from the top end of the dewatering basket (104); 6. Device according to claim 5, characterized in that it is arranged at a height. (7) A mixing means (116), in particular a stirring wheel, is provided in the mixing reaction chamber (102), preferably adjacent to the sludge/flocculant inlet (110). The device according to any one of items 4 to 6. (8) Two coaxial sieve baskets (130, 131) are provided, and the sludge is transferred to the two sieve baskets (130, 13).
The device according to any one of claims 4 to 7, characterized in that the device is supplied to an annular portion located between 1) and 1). (9) means for the dewatering basket (104) to clean the opening of the at least one sieve basket (130);
138)
The method according to any one of Items 8 to 9. 10. Apparatus according to claim 9, wherein the cleaning means (138) comprises a rotating scraper for sweeping the surface of at least one sieve basket (130). (11) Between the lower end of the dewatering basket (104) and the sludge chamber space (270), means (158) are provided for controlling the speed at which the pre-dewatered sludge is transferred to the sludge chamber space (270). 11. The device according to claim 1, further comprising: . 12. The device according to claim 11, wherein the control means comprises a controlled or automatically controlled flap valve (158) or a controlled or automatically controlled slip valve. (13) The sludge chamber space (270) extends linearly between the dewatering basket (104) and the sludge cake discharge station (B). equipment. (14) The sludge chamber space (270) has a lower rotating filter belt (6, 214) and an upper rotating belt (7, 21).
13. Device according to claim 12, characterized in that it is defined between: (2) and (2). (15) The upper belt (7) is connected to the pressure belt (12, 212
).) The device according to claim 13. (16) A belt (
6, 7, 214, 212) at least one pair of mutually opposing horizontal fixed pressure plates (35, 36, 272, 27
4) A linear and horizontal high-pressure dewatering zone (
belts (6, 7, 214, 21) extending through the sludge chamber space (270);
2) extends between the pairs of pressure plates, and the pairs of pressure plates are arranged to be intermittently movable towards each other to apply dewatering pressure. The device according to item 15. 17. Device according to claim 16, characterized in that a number of juxtaposed pairs of pressure plates (35, 36, 272, 274) are provided. (18) The lower pressure plate (35, 272) is connected to the device frame (
39, 276), and the upper pressure plate (
36, 274) are hydraulic high pressure generators (37, 38, 28
2), or vice versa. The device described. (19) Pressure plates of each pair of pressure plates (35, 36, 272,
274) is biased to the open position by the compression springs (40, 41, 288), in which the sludge chamber space (2
belt (6, 7, 9, 9a, 212,
214, 224) are pressure plates (35, 36, 272, 27
4) A device according to claim 18, characterized in that it is capable of advancing between 4) and 4). (20) A pair of pressure rollers (42) facing each other for guiding the belt defining the sludge chamber space (270).
, 290, 292) are arranged along the high-pressure dewatering zone (5, 300). (21) The device according to claim 19, characterized in that the pressure rollers (47, 290, 292) are spring-biased towards the sludge chamber space (270). (22) Seal ring (10
, 11, 256, 268), high pressure dehydration zone (5, 3
00) and is used to seal the sides of the sludge chamber space (270). equipment. (23) The filter belt (6, 7, 214) has a support belt (9, 9a,
22. Apparatus according to any one of claims 14 to 22, characterized in that it is supported by: 224). (24) A wedge-shaped dehydration stage (3,
4, 200), and the sludge chamber space is narrowed into a wedge shape in the sludge transfer direction (A) in the wedge-shaped dewatering stage (3, 4, 200). Apparatus according to any of paragraph 23. (25) Belts (6, 7, 2
12, 214), wedge-shaped dehydration stage (3, 4, 200
) adjacent rotating chain link belts (228, 25
8) or supported by a roller belt. (26) a rotating lower belt means (202) extends linearly and substantially horizontally between the end pivot pulleys (216, 218), and the dewatering basket (104) is located at one end of the lower belt means (202); The space (204) between the lower end of the sludge space of the dewatering basket (104) and the lower belt means (202) is sealed on its sides towards one end of the belt means, and the belt The device according to any one of claims 13 to 25, characterized in that it has a structure that is open in the moving direction (A). (27) Device according to claim 26 or 12, characterized in that a flap valve (158) or a slide valve follows the dewatering basket (104) of the pre-dewatering stage (100). (28) Turning roller (234) of the upper rotating belt means (212) facing the preliminary dewatering stage (100)
) follows the flap valve (158) or slide valve, and the upper belt means (212) follows the turning roller (23).
4) down to the other turning roller (236) at the end of the wedge-shaped sludge chamber space (200), thereby defining the wedge-shaped sludge chamber space (200). The device according to item 27 or item 24. (29) The sludge to be dewatered flows vertically through the pre-dewatering stage (2, 100) and the sludge chamber space (2,
70) followed by pressurization stages (3, 4, 5, 200,
29. A device according to any one of claims 1 to 28, characterized in that the device extends horizontally within 300). (30) The buffer means is provided with a large-volume pre-dehydration chamber (1) whose bottom (16) is constituted by a filter belt (7).
5). The device according to any one of claims 1 to 29, characterized in that the device comprises: (31) In addition to the filter surface (1
31. Device according to claim 30, characterized in that 8) is provided. (32) Device according to claim 31, characterized in that the filter surface (18) consists of a fluted sieve (19) arranged in the pre-drying chamber (15). (33) A wedge-shaped intermediate pressure stage (3, 4) continues in the conveying direction after the preliminary dewatering chamber (15), and in the intermediate pressure stage, the upper pressure belt (7, 13) runs over the sludge being conveyed. The device according to any one of claims 30 to 32, characterized in that: (34) Claim characterized in that the pressure belt (70, 13) consists of a vaned belt or scraper belt provided with a number of protruding transverse webs (vanes) (8) fixed to the belt. Apparatus according to paragraph 33. 35. Device according to any one of claims 30 to 34, characterized in that a number of co-circulating protruding transverse webs (8) cooperate with the filter belts (6, 7). (36) A device according to claim 34 or 35, characterized in that the projecting transverse web (8) is swingable or flexible. (37) Device according to claim 35 or 36, characterized in that the projecting transverse web (8) is fixed to a separately rotating web belt (61). 38. Device according to claim 37, characterized in that the web belt (61) consists of two spaced apart rotating rubber bands (62, 63). (39) Web belt (61) is sealed (10, 11)
39. A device according to claim 37 or 38, characterized in that it rotates in unison with the rotation of the device. (40) The device according to any one of claims 30 to 39, characterized in that two intermediate pressure stages (3, 4) are connected in series. (41) Filter belt (6) and pressure belt (7)
is a large number of pressure rollers (2) in the medium pressure stage (4).
3) Device according to any one of claims 30 to 40, characterized in that it is supported on. (42) Claim 4, characterized in that the pressure applied by the pressure rollers (23, 25) is variable.
The device according to item 1. (43) Upper and/or lower pressure roller (23 and/or
or 25) to the respective common mounting frames (24, 2
6) is provided, and the mounting frame (24, 26
) is pivoted at one end, and the mounting frame (24, 2
43. Device according to claim 42, characterized in that a pressure generator (45) is provided for transmitting the oscillations to 6). (44) Any one of claims 1 to 43, characterized in that support bars (29, 30) made of a low-friction material are provided between adjacent pressure rollers (23, 25). The device described in Crab. (45) The support bars (29, 30) are arranged such that each support bar has an upper or lower pressure roller (23,
45. The device according to claim 44, wherein the device is disposed so as to face the device 25). (46) Device according to claim 45, characterized in that the support bars (29, 30) are spring-damped. (47) The pressure generator (45) is a hydraulic cylinder (45)
47. A device according to any one of claims 43 to 46, characterized in that it consists of: (48) The filter belt (6) is placed on a plate provided on the lower fixed pressure plate (35) in the high pressure stage, and the plate has a filtrate groove (56) open at the top. An apparatus according to any one of claims 30 to 47, characterized in that: (49) The device according to claim 48, characterized in that a pressure roller (42) is provided that projects on the surface of the plate (55). (50) Claim 4, characterized in that the plate (55) is made of low-friction plastic or rubber.
The device according to item 8 or 49. (51) A filter belt (6 or 7) is supported on support belts (9, 9a) that move in unison with the filter belt, and the support belt extends at a constant angle with respect to the conveying direction. Claims 30 to 47 have a filtrate groove with an open top.
Apparatus according to any of paragraphs. (52) The vaned belt (12) and/or the web belt (61) extend through the locking chamber (48) until entering the medium pressure stage (3, 4). The apparatus according to any one of items 34 to 51. (53) The lock chamber (48) is the winged belt (12)
Claim 1, characterized in that it is defined by a surface portion (49) spaced apart from and opposite thereto, said surface portion being in contact with the free upper edge (50) of the projecting transverse web (8). 53. Apparatus according to paragraph 52. (54) The sludge chamber space is connected to the lower rotating filter belt (
6) and the upper rotating belt (7, 12, 61, 70). (55) The device according to claim 54, characterized in that the upper belt is a pressure belt (7a, 12).