JPS61262498A - High-pressure dehydration treatment device - Google Patents

Abstract

PURPOSE:To improve working efficiency by providing pressing plates facing each other, executing intermittent high-pressure dehydration and disposing a gravity dehydration sludge hopper and feeding mechanism. CONSTITUTION:Two sheets of the pressing plates 7a, 7b facing each other are provided and the sludge sandwiched between filter cloths 5a and 5b is fed therebetween, by which the intermittent high-pressure dehydration is executed. The sludge supplied first to a mixing tank 1 is mixed and is fed to a gravity dehydration section 2 from which the sludge is intermittently supplied onto the belt-like filter cloth 5a through the sludge hopper 3 and the feeding mechanism 4. The sludge is subjected to the low-pressure dehydration between another filter cloth 5b and filter cloth 5a and is fed to the high-pressure dehydration section 7 to execute relatively the intermittent operation so that said dehydration is connected to the high-pressure dehydration of the plates 7a, 7b. The low- pressure dehydration and high-pressure dehydration are efficiently executed by the mechanism 4 and therefore the sludge treatment efficiency over the entire part is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-pressure dehydration treatment device, and the present invention relates to a high-pressure dewatering device having an intermittent high-pressure squeezing mechanism built into a pressurizing plate. Under normal operating conditions, the gravity dewatering section installed in front of the sludge is operated continuously to smoothly carry out processing related to sludge flocculation, etc., and to efficiently carry out high-pressure compression processing. .

Industrial applications High-pressure dewatering equipment for sludge and other materials obtained from sewage treatment facilities.

Conventional technology With the recent spread of sewage systems, the amount of sludge generated from sewage treatment plants has increased, and 3i is becoming more and more efficient in its treatment and disposal. There is a demand for higher efficiency.

However, the requirements that such a high-efficiency dewatering machine must meet are: ■ Low cake moisture content (for example, sewage mixed raw sludge 7
0% or less) ■ Must have high-speed performance (more than 120 kg/1 m) ■ Must be easy to maintain ■ Must be economical By the way, increasing the pressurizing pressure is effective against (1) among these conditions. It's obvious that it's gone! Figure 3 shows the relationship between pressurization pressure and cake moisture content, and Figure 4 shows the relationship between pressurization time and cake moisture content. From these results, it is clear that if the pressurization pressure is 2 kp/crI or more, the pressurization time is It is understood that if the heating time is 10 minutes or longer, the moisture content of one re-cake can be reduced to 70% or less.

However, Fig. 5 shows the conventional general Peltogeles,
The sludge received by the supply conveyor 14, which is a gravity dewatering section, is fed onto the belt 11 while being gravity dehydrated, and the sludge passes through a group of rollers 15 and 16 between the belts 11 and 12. It is dehydrated under pressure.

In addition, a version that further increases the pressure of the one shown in Fig. 5 is one that also employs an additional pressure belt 13 and roller 17 that act on the hydraulic mechanism shown in Fig. 6, and a pair of high-pressure plates 18t. The pressurizing effect of the high-pressure plate 18 is applied intermittently, and the discontinuous plate pressurizing method is shown in Figure 7. Take it out from section 19.

Problems to be Solved by the Invention However, each of the above nine conventional devices still has its own problems. In other words, if the belt is simply suspended between the rollers 15 and the rollers 16 in FIG.
d or less, and the time for which the water actually acts effectively as a dewatering action depends on the time it takes to pass through the roller surface, so the effective dewatering time cannot be taken into account.

The one in Figure 6 uses an additional pressure belt 13 that is operated by a hydraulic mechanism, etc., and the pressure is 10 kg/cm.
r! However, the effective dewatering time is also the time required for the additional pressure belt 13 to pass through the portion in contact with the roller, and cannot be achieved sufficiently. Therefore, in order to lengthen the passage time, it is necessary to employ the additional pressure belts 13 in multiple stages, which complicates the configuration, increases the size of the device, and increases operating costs.

This instillation shown in Figure 7 is installed opposite to the latter half of the I-1 Peltogelles dehydrator and uses a pressurizing plate f'L9, so the pressurizing pressure and pressurizing time can be set arbitrarily. Since the pressure plate stops when pressurizing, the running of the belt has to be intermittent, and the continuous running of the belt has to be intermittent in relation to sludge supply as well. In other words, in such a belt press dehydrator, dehydration is carried out through the following steps: heat treatment → gravity dehydration → low pressure pressurization section → high pressure pressurization section, but when each of these steps is operated intermittently, the most The problem lies in the tempering process. In the refining step, the supplied sludge is mixed with a flocculant to form flocs,
It is an important factor for the dewatering process that the floc formation is carried out in an optimal state, and optimization of floc formation is achieved because sludge supply, stirring, flocculant addition, etc. are generally continuous. Even though the sludge temperature is constant at 11 degrees, intermittent operations are not only extremely cumbersome in terms of operation, but also disrupt floc type GL & optimization. It has no choice but to become a thing.

It is also possible to install a timing roller in the middle of the pressure process and run the roller while the pressure plate is applying pressure to perform continuous processing. If this is done, the travel distance of the rollers will have to be increased, and the device i will become larger. In addition, if the running speed of the belt is slowed down for this purpose, it is necessary to change the sludge supply and tempering speeds, and even if the sludge is slow to reach the bottom, these controls must be carried out in the same way as described above. make it extremely difficult.

``Structure of the invention'' Means for solving the problem: sludge is supplied between the belt-like filter cloths, and a pressurizing plate is disposed opposite to the process of suspending and transferring the belt-like P cloths to intermittently apply high pressure. In the dewatering device, a gravity sludge hopper is provided between the gravity dewatering unit placed in front of the pressure plate area and the belt-shaped filter cloth suspension transfer process. A high-pressure dehydration treatment apparatus, characterized in that a cutter m is installed between the belt-shaped filter cloth and the hanging transfer process.

The sludge supplied between the belt-shaped filter cloths is intermittently subjected to high-pressure dehydration treatment by a pressurizing plate arranged opposite to the suspension transfer process of the belt-shaped filter cloths, which is a very suitable dehydration process. Acquire.

By providing a gravity dewatering hopper between the high-pressure dewatering section using the pressure plate and the gravity dewatering section located in front of the high-pressure dewatering section, the gravity dewatering section and the gravity dewatering section are provided in front of the gravity dewatering section to perform flocculation treatment for fixed sludge, etc. The sludge is continuously carried out, and the sludge is appropriately cut out from this gravity dewatered sludge hopper via a cut-out mechanism, and the dewatering process in the high-pressure dewatering section is carried out accurately under predetermined high-pressure conditions and pressurization time.

The degree and time of pressurization obtained in the high-pressure dewatering section decisively control the water content in the sludge cake obtained through the high-pressure dewatering section, and the sludge cake is dehydrated with an appropriate water content.

EXAMPLE A concrete embodiment of the invention according to the above-mentioned specific gravity will be described with reference to the attached drawings. Sludge is supplied from a sludge storage tank, etc., and is stored in a mixing tank 1 together with a flocculant, and is heated under suitable stirring conditions. Sludge flocs are formed in this manner, and the sludge after floc formation is guided to the gravity dewatering section 2 and received by the sludge hopper 3 after gravity dewatering.

The Kamimachi sludge hopper 3 is provided with a cutting mechanism 4 at its bottom, which is operated intermittently to cut out the sludge.

The sludge cut out in this way is supplied onto the belt-like F cloth 5a, and is separately led onto the belt-like F cloth 5a.
It is sandwiched between b and 9 and guided to a low-pressure dewatering section 6, dehydrated while meandering between rollers, and sent to a high-pressure dehydrating section 7. The high-pressure dehydration section 7 is composed of two facing pressure plates 7.
a.

The sludge sandwiched between the furnace cloths 5a and 5b is fed between the furnace cloths 5a and 5b, and a hydraulic or other pressurizing mechanism is used while the F cloths 5a and 5b are stopped! 55
To? The sludge is dehydrated with a pressure of /c-d or more.

The sludge that has been subjected to high-pressure dewatering using the pressure plates 7a and 7bKj as described above is exposed to the belt-like cloth 5a, and is peeled off from the furnace cloth 5a by a scraper 9, and conveyed to a conveyor (not shown).
The gravity-dehydrated sludge from the sludge hopper 3 is cut out in conjunction with the drive drum 8 of the high-pressure pressurizing section 7 and the furnace cloths 5a and 5b. Appropriate electrical or mechanical interlocking means are provided for the operation, and their driving is stopped during pressurization in the high pressure pressurizing section 7.

The floc formation process in the sludge mixing tank 1 and the gravity dewatering process in the gravity dewatering section 2 are performed continuously between them, and the sludge is stored in the sludge hopper 43.

Solids S degree F in feed sludge to be generally dewatered
The moisture content of the sludge in the sludge pile after gravity dewatering is about 90%. This means that gravity dewatering reduces the volume of sludge by 50 to 60%, and compared to storing raw sludge, the hopper volume can be made smaller.
The size and operating conditions of the equipment after 3 are also reduced. Since the refining process and the gravity dewatering process are operated continuously as described above, the operating conditions in these processes can be operated in the optimal state, and the properties of the raw sludge change and are adjusted in the summer.

It uses a sophisticated control mechanism and requires complicated operations.

The cutting mechanism 4 may have any structure as long as it can cut out gravity-dehydrated sludge intermittently.
After pressurizing in the high pressure pressurizing section 7, the furnace cloths 5a and 5bl are run, and while the cake is peeled off by the scraper 9, the cutting mechanism 4. is operated, and the gravity-dehydrated sludge is cut out onto the cloth 5a that is moved by the drive drum 8. A specific example of this sludge hopper 3 and cut-out mechanism 4 is shown in the second section.
As shown in the figure, the row 241 is placed 2 times in the cow radial direction.
The F cloth 42 is hung between these rollers 41 and 41 in the groove shown in the figure, and a gap 43 is formed on the outer side between the inner diameter roller and the outer diameter roller. By rotating this device, the outer diameter roller comes into contact with the side wall of the cutout section 49!1114, and the gravity-dehydrated sludge does not fall while the rotation of the cutout mechanism 4 is stopped. Due to the rotation, nine predetermined amounts of sludge that fills the cavity 43 are sequentially discharged. The gravity-dehydrated sludge in Hola/-3 is consolidated by 7 minutes, and the water content is 1 jl and 9 water is P.
It is dripped onto the belt-like p-cloth 51 through the cloth 42 and received by an eF liquid receiver (not shown) provided at the bottom of the cloth 42, but dehydration is also carried out in the hopper 3, so that the water content is reduced. The lower gravity dewatered sludge is supplied to the low pressure dewatering section 6.

Decreasing the water content rP1 of the gravity-dehydrated sludge supplied to the low-pressure dewatering section 6 to the above 15 as much as possible reduces the fluidity of the sludge, and prevents sludge leakage at the inlet of the low-pressure dewatering section 6. In addition, the pressurizing pressure of the low-pressure dewatering section 6 is set high. This further causes a decrease in the water content of the sludge cake supplied to the high-pressure dewatering section.
It also shortens high-pressure dehydration processing time and increases throughput.

The 7 tt force-dehydrated sludge cut out by the cut-out mechanism 4 shown in FIG.
The layer is developed as a layer having a substantially uniform thickness between the layers b.

``Effects of the Invention'' As explained above, the present invention is based on the above-mentioned method in which a pressurizing plate is disposed opposite to the suspended conveyance process of the belt-like filter cloth to perform high-pressure dehydration treatment intermittently. A gravity dewatering sludge hopper girder is provided between the gravity dewatering section placed in front of the continuous pressure plate distribution area and the above-mentioned hanging transfer process of the belt-like filter cloth, and the hopper and the above-mentioned belt-like filter cloth hanging transfer process are provided. By providing a cut-out mechanism between the sludge process and the sludge treatment process, the intermittent high-pressure dewatering process can be carried out without affecting the sludge refining process or gravity dewatering process, that is, accurate high-pressure dewatering can be performed at any desired time and pressure. In addition, it is possible to carry out the V4 quality or gravity dewatering process continuously and in an optimal state.Moreover, it is possible to convert the entire equipment into a conductor/duct by simply adding a hopper. Effect 1: This invention has 7 industrially significant effects.

[Brief explanation of drawings]

The drawings show the technical contents of the present invention, and FIG. 1 shows the general structural relationship of the high-pressure dehydration treatment apparatus according to the present invention. The clear and wcz diagrams are cross-sectional views of the cutting mechanism at the lower end of the 7th hole/4', and Figure 3 shows the relationship between pressurization pressure and cake moisture content obtained by sludge treatment at a sewage treatment plant. Figure 4 shows the relationship between cake moisture content and pressurization time; Figure 5 is a side view of a conventional general belt press;
The figure is a side explanatory view of a device using the additional pressure belt No. 7, and FIG. However, in these drawings, 1 is the 'l & platform, 2 is the gravity dewatering section, 3d is the sludge hopper, 4 is the cutting mechanism, 5a, 5
b is a belt-like filter cloth, 6 is a low-pressure dehydration section, f is a high-pressure dehydration section,
Numerals a and 7b are pressure plates, 8 is a driving drum, 9 is a scraper, 41 is a roller, 42 is an F cloth, and 43 is a gap. No. / En O4 Ha 11-2 Same No. 4 ■ Orono E Tachikenra (Intermediate Jun 6 I 1/, / No. 6 En

Claims (1)

[Scope of Claims] 1. In an apparatus in which sludge is supplied between belt-like filter cloths and a pressure plate is disposed opposite to the suspended transfer process of the belt-like filter cloths to perform high-pressure dehydration treatment intermittently. , a gravity dewatering sludge hopper is provided between the gravity dewatering unit disposed in front of the pressure plate installation area and the belt-like filter cloth suspension transfer process, and the gravity dewatering sludge hopper and the belt-like filter cloth 1. A high-pressure dehydration treatment apparatus characterized in that a cutting mechanism is provided between the suspension transfer process and the suspension transfer process. 2. The high-pressure dehydration treatment apparatus according to claim 1, wherein the cutting mechanism is formed of a filter material. 3. The high-pressure dehydration treatment apparatus according to claim 1, wherein the cutting mechanism is linked with a high-pressure dehydration section provided with a pressure plate.