KR20120091553A - A solid-and-liquid seperating apparatus for treating effluents, a screw dehydration apparatus and a treatment using them - Google Patents

Abstract

PURPOSE: A solid-liquid separating apparatus for treating wastewater, a screw dehydrating apparatus, and a wastewater treating apparatus using the same are provided to increase solid-liquid separating efficiency by coagulating harmful materials into sludge and eliminating the sludge. CONSTITUTION: A solid-liquid separating apparatus for treating wastewater includes an outer container(501) and an inner container. The inner container is mounted at the outer container. The outer container includes a treating water inlet, a suspended material outlet, a treated water outlet, and a precipitate outlet. The treating water inlet is in contact with the inner side of the outer container. The lower side of the inner container is opened, and a treated water discharging section is formed at one inner side of the inner container. The water discharging section is divided from remaining sections by a filter(530).

Description

A solid-and-liquid seperating apparatus for treating effluents, a screw dehydration apparatus and a treatment using them

The present invention is a sludge separation device used to increase the solid-liquid separation efficiency when the harmful substances in the waste water are mixed with chemicals and coagulated and removed by sludge, and a screw dehydration device for dewatering the sludge recovered from the separator, and a wastewater treatment device using the same. It is about.

In general, the sludge sedimentation method in which a plurality of tanks are provided and waste water passes through each tank and undergoes aeration and sedimentation is widely used. However, this aeration and sedimentation treatment method of the wastewater has a problem that it takes a lot of time to purify the wastewater and the area required to install the device is large, the treatment cost is high and inefficient.

Another wastewater treatment method that has been widely used in recent years has been applied to a method and apparatus for collecting and removing the injured sludge by flocculating the harmful substances of the wastewater into the sludge to rise above the water surface. This causes the sludge to be floated by applying a high pressure in the tank using a pressure flotation tank to instantly float the sludge. However, the pressure flotation method requires the installation of a separate sealed pressurized tank and the pressurization and depressurization is adjusted by applying pressure with the compressor, which reduces the instantaneous flotation efficiency of the agglomerated sludge and sometimes the sludge does not form a single layer in the tank. Even if a few layers are separated or a moment of injury, the sludge is settled as time passes, so that the floating effect is not sustained, so that there is a problem that the treatment efficiency is greatly reduced. As a result, in this wastewater treatment apparatus, the treatment chemicals (typically wastewater treatment chemicals containing inorganic polymer flocculant and organic polymer flocculant) are mixed with the wastewater to coagulate into sludge particles (flocs) and then effectively separated into sludge and treated water. A device is needed. On the other hand, a dewatering device for further lowering the water content is required for the useful utilization of the separated sludge, but the conventional belt dewatering device, vacuum dewatering device and gravity filtration device is not preferable in terms of installation cost and space utilization.

The present invention was created in view of the above problems, by mixing wastewater and treatment chemicals to agglomerate harmful substances present in the wastewater into sludge, and separate the sludge centrifugal force introduced without using a separate pressurized flotation tank when separating them. It is to provide a rotary solid-liquid separator that can separate the slurry from the treated water by the weight difference according to the properties. It is also to provide a screw dewatering device useful in installation cost and space utilization. These devices have a simple structure and a small installation size, which greatly reduces the cost of the device. By applying this, the cost of maintaining the wastewater treatment device can be minimized.

In order to achieve the above object, the present invention is a solid-liquid separation device of the wastewater treatment apparatus for aggregating and removing the harmful substances by sludge by mixing the treatment chemicals in the waste water, the solid-liquid separation device is the inner cylinder and the inner cylinder is mounted to the inner center of the outer cylinder The outer cylinder has a treatment mixture inlet formed in contact with the inner surface such that the treated mixture is pivoted along the inner surface by the inlet centrifugal force, the wound outlet and the treated water outlet through which the wounds forming the inner surface of the inner outer cylinder are discharged. A sediment outlet is formed in the lower part of the outer cylinder. The inner cylinder has an open lower portion and a treatment water discharge zone is formed at one inner side thereof, and the treatment water discharge zone is separated from the inner cylinder and other zones by a filter. A treated water path extending from the inner cylinder treated water discharge zone and reaching the treated water outlet is formed so that the treated water passing through the inner cylinder filter is discharged to the outside. Non-limiting, the solid-liquid separator outer cylinder and inner cylinder can be cylindrical or rectangular. A floating flow obstructing mesh may be further formed on one side of the inner cylinder outer outer cylinder.

The dewatering device according to the present invention can separate the dewatering filtrate from the sludge by screw pressing. The dehydration apparatus of the present invention includes a collecting tank having a dehydration liquor outlet formed therein and a transport path pipe extending therethrough. Inside the feed path is provided a rotating shaft which is linked by a motor and a spiral plate bound to the outer circumference of the rotating shaft. In particular, the transport path portion passing through the collection tank is formed with a plurality of slot holes, the brush is mounted on the outer periphery of the spiral plate corresponding to the slot hole. Preferably the brush is a wire brush. Floating and upstream of the collection path portion may be formed of inlet and sediment inlet, respectively. An inspection window may be formed on the upper surface of the collection tank to observe and gradually collect the inside of the collection tank such as a brush state.

In another aspect, the present invention to provide a wastewater treatment apparatus comprising the separator and / or dewatering device. The wastewater treatment apparatus may further include a reaction tube, a stirring apparatus, and a stirring pump tank upstream of the separator.

According to the present invention, sludges formed by mixing treatment chemicals and wastewater and reaction can be separated into sediment, flotation and treated water according to the treatment mixture water inlet centrifugal force and sludge properties without sludge. The sediment and the flotation separated therefrom can be further compressed by the slot hole forming transfer path and the brush binding screw plate, which are easy to maintain, to obtain sludge with reduced water content. These devices can be manufactured in a small size, which is advantageous in space utilization, can eliminate expensive sludge flotation pumps, and prevents slot hole clogging that may occur during operation in filtrate dehydration. Maintenance costs can be minimized.

1 is a system diagram of a wastewater treatment apparatus according to the present invention,
2 is a schematic plan view (a) and side view (b) of the solid-liquid separator of the present invention;
3 is a view showing a schematic plan view (a) and a side view (b) of the present invention dehydrating device,
Figure 4 is a perspective view of the present invention dehydrator removed top plate.

Hereinafter, the configuration and operation of the present invention will be described with reference to the accompanying drawings.

First, terms used in the present invention are defined. The present invention relates to a device for separating sludge formed from the agitation and reaction of waste water and treatment chemicals with a fluid, and further, a device for reducing the sludge moisture content, and the term 'treated mixed water' herein refers to a stirring device and a reaction. It means a fluid in which a certain sludge flowing out of the tube is formed. Sediment as used herein means a relatively heavy sludge class in sludge, and flotation means a relatively light sludge class in sludge. In the wastewater treatment, the degree of deposit and flotation formation may vary depending on the treatment chemicals and the like. In other words, if floc formation is favorable according to the performance of the treatment chemicals, the sediment ratio may increase. Based on the fluid flow including the treated mixture, 'upstream' means the position before or after the element that it designates and 'downstream' means the position after or after the element that you designate. For example, the dehydrator arrangement herein is located downstream of the separator and the reaction tube is disposed upstream of the separator.

1 is a schematic view showing a wastewater treatment apparatus according to the present invention. In general, the wastewater treatment device is a stirring pump tank 100, the first stirring device 200, the second stirring device 300, the reaction tube 400, rotary solid-liquid separator 500, screw dewatering device (600) ) And the dewatering liquor tank 650, the sewage tank for supplying the sewage (wastewater) to the wastewater treatment apparatus in Figure 1 is not given a separate sign. In general, the wastewater to be purified is collected and stored in the sewage tank, and the wastewater stored in the sewage tank is introduced into the stirring pump tank 100 through a transfer pipe by a pump driving, and the treatment chemical is preliminarily treated in the stirring pump tank. And the mixed fluid is introduced into the stirrer (200, 300) at a high pressure by the pump. After sludge formation is completed while passing through the reaction tube, these sludges are separated from the treated water by the solid-liquid separator 500 of the present application.

Figure 2 shows a solid-liquid separator 500, referring to this, the separator 500 according to the present invention is composed of a hollow outer cylinder 501 and the inner cylinder 520 mounted to the inner cylinder inner center, the The outer cylinder is treated mixed water inlet 510 formed in contact with the inner surface such that the treated mixed water including sludge is rotated along the inner surface of the outer cylinder by the inlet centrifugal force, the wound outlet 540 through which the injured object forming the inner surface of the inner outer cylinder is discharged; A treated water outlet 550 is formed at the side, and a sediment outlet 504 is formed at the bottom of the outer cylinder. The three openings formed on the side surface are preferably spaced apart as much as possible to utilize the outer space. In particular, the sediment outlet 504 formed in the lower portion is further equipped with an on-off valve can be automatically opened when a certain amount of sediment is collected. In the front of the wound outlet 540, a float flow blocking mesh 511 may be further formed on one side. As a result, the wounds pivoting along the outer cylinder inner surface are likely to escape the float outlet 540 by stopping the flow across the mesh.

On the other hand, the inner cylinder 520, which is mounted at the inner center of the outer cylinder, is opened at a lower portion, and the treated water discharge zone 503 is formed at one inner side thereof. The treated water discharge zone is separated from the inner cylinder and other zones 533 by a filter 530. A treated water path 502 is formed extending from the inner cylinder treated water discharge zone 503 and reaching the treated water outlet 550 so that the treated water passing through the inner cylinder filter is discharged to the outside. The solid-liquid separator and the outer cylinder and the inner cylinder may be cylindrical or rectangular, but preferably, it is advantageous to maintain the centrifugal force consisting of a cylinder. The treated mixture contains sludge of various properties, but if it is strongly sprayed along the inner surface of the outer cylinder through the treated mixture inlet 510, the treated mixture is rotated and there are many factors, but most decisively depending on the sludge weight. It can be separated into deposits, flotations and the like. The sediment sinks to the bottom of the outer cylinder by its own weight and the lighter wounds form the inner outer shell outer surface while maintaining the turn. Slewing wounds do not pass through the floating flow disturbance mesh 511 and are collected in front of the floating outlet 540 and are pushed to the outlet 540 by the ongoing floating. On the other hand, pure fluid and the lightest sludge are concentrated and raised under the inner cylinder while turning, and flow into the inner cylinder. At this time, the lightest sludge flowing in and out is filtered by the filter 530 so that only the fluid including the treated water is discharged to the outside along the treated water path 502. Precipitates and flotations recovered through the above process can be further dewatered by the dehydration apparatus of the present application to produce useful sludge with low water content.

3 and 4 illustrate a screw dewatering device, referring to this, the dewatering device 600 according to the present invention can separate the dewatering filtrate from the sludge by rotating screw compression. The dewatering apparatus of the present invention includes a collecting tank 650 having a dehydration liquid outlet 602 formed therein and a transport path pipe 601 extending therethrough. Inside the transport path, a rotating shaft 640 interlocked by the motor 630 and a spiral plate 641 fastened to the outer circumference of the rotating shaft are installed. The transfer path 601 may be divided into a section passing through the collecting tank and an upstream and downstream section of the collecting tank. In particular, the feeding path section passing through the collecting tank is formed with a plurality of slot holes 670, and the slot hole Correspondingly, a wire brush 642 is mounted on the outer circumference of the spiral plate 641. Float and sediment inlets 610 and 620 may be formed in the collection tank upstream transport path, respectively. The collection tank upper surface 603 may be provided with a check window for observing and monitoring the interior of the collection tank, such as a brush state. At the feed path end 660, a sludge discharge port having reduced water content may be formed. Looking at the helical plate operation inside the transport path, the flotation and sediment introduced upstream of the transport path are pressed against the inner surface of the pipe profile forming the transport path while advancing towards the end as the plate 641 rotates. Accordingly, the dehydration filtrate is discharged through the formed plurality of slot holes 670 and collected in the lower portion of the collection tank 650. As this operation continues, the slot holes may be blocked by sludge, so the present invention is characterized by further mounting the brush 642 on the outer periphery of the plate 641, which may be in contact with the slot hole. Therefore, when the plate rotates, the brush contacts the slot hole at the same time to prevent potential slot hole clogging.

Hereinafter will be described in more detail with respect to the operation of the present invention.

The waste water stored in the sewage tank is mixed with the treatment chemicals in the stirring pump tank 100 and the stirring apparatuses 200 and 300 to react with various sludges. The treated mixed water including such sludge is strongly sprayed along the inner surface of the solid-liquid separator external cylinder 501 through the treated mixed water inlet 510. The injected treated mixed water is moved downward while turning the inner surface of the outer cylinder by centrifugal force, and heavy sludge descends and precipitates in the lower portion of the outer cylinder. However, the lightweight float forms an inner cylinder outer outer cylinder inner surface along the interlocking fluid, and flow is stopped by the obstacle obstructing mesh 511 and collects in front of the float outlet 540. Subsequently, the fluid containing the wound is discharged from the outlet 540 by the fluid including the wound that continues to be pushed. On the other hand, the fluid and the lightest sludge are concentrated under the inner cylinder and raised inside the inner cylinder while turning the outer cylinder outer surface. The lightest sludge is filtered by the inner cylinder filter 530 and the fluid (treated water) passing through the remaining filter is discharged to the outside through the treated water path 502. Sediment settled in the lower part of the outer cylinder and the floating off the side of the outer cylinder is further removed by the dehydration apparatus of the present application to be used as a useful sludge. Specifically, the flotation and precipitate are introduced into the dehydrator transport path 610 via inlets 610 and 620, respectively. As the motor 630 operates to rotate the rotation shaft 640, the attached spiral plate 641 and the wire brush 642 attached to the outer circumference thereof are rotated at the same time. The sludge filled in the space between the plates is dewatered as it comes into contact with the inner surface of the pipe forming the transport path and is compressed. The dewatering filtrate is discharged through a plurality of slot holes 670 formed at the pipe interface and collects on the bottom of the collection tank 650. At the same time, as the wire brush 642 is rotated, the slot hole is blocked by sludge in contact with the slot hole. The dewatered filtrate is collected in the dewatered filtrate 650 and can be circulated to the separator 500 according to the filtrate properties. As shown in FIG. 1, the dewatering filtrate may be circulated through a separate inlet to one side of the separator via a pump (not shown), but may optionally be introduced into the separator through the treated mixture inlet.

According to the present invention as described above, the sludge formed by mixing the treatment chemicals and waste water, and the reaction is effectively treated as sediment, flotation and treated water according to the centrifugal force and sludge properties of the treated mixed water including sludge, without the need for a separate pressurized flotation. The sediments and flotations separated therefrom can be further compressed by slot hole-forming transfer paths and brush-bound spiral plates that are easy to maintain to obtain sludge with reduced water content. The devices can be manufactured in a small size, which is advantageous for space utilization, can eliminate expensive sludge floating pressure pumps, and can be applied to a wastewater treatment device by preventing slot hole clogging that may occur during operation in filtrate dewatering. Maintenance costs can be minimized.

10: wastewater treatment device, 100: agitating pump tank, 200, 300: agitator, 500: rotary solid-liquid separator, 501: outer cylinder, 520: inner cylinder, 530: filter, 600: dewatering device, 601: transfer path pipe, 641 : Spiral plate, 642: brush, 650: dehydration tank, 670: slot hole.

Claims (8)

In the solid-liquid separation device of the waste water treatment apparatus for mixing the treatment chemicals in the waste water to agglomerate the harmful substances by sludge, the solid-liquid separation device is composed of an inner cylinder and the inner cylinder mounted on the inner center of the outer cylinder, the outer cylinder is treated mixed water inflow The treatment mixture water inlet formed in contact with the inner surface to rotate along the inner surface by centrifugal force, the inlet and outlet of the treated water, and the outlet of the treated water are formed on the side, and the sediment outlet is formed at the lower side. The inner cylinder is open at the lower portion and formed on the inner side of the treated water discharge zone which is separated from the other zones by a filter, and the treated water path extending from the inner cylinder treated water discharge zone and reaching the treated water discharge port is formed. Solid-liquid separator for processing. The solid-liquid separator for wastewater treatment according to claim 1, wherein the outer cylinder and the inner cylinder are cylindrical or rectangular in shape. The solid-liquid separator for wastewater treatment according to claim 1, wherein a floating flow obstructing mesh is further formed on one side of the inner cylinder outer outer cylinder. In the dewatering device for dewatering the sludge separated from the solid-liquid separation device of the wastewater treatment device by mixing the treatment chemicals in the waste water by agglomeration of the harmful substances with sludge, the dewatering device is a collection tank formed in the bottom of the dehydration filtrate and through It includes a conveying path extending to the inside, the conveying path is provided with a rotating shaft and a spiral plate bound to the outer circumference of the rotating shaft interlocked by the motor, a plurality of slot holes are formed in the conveying path pipe passing through the collection tank, the slot Sludge dewatering device, the brush is mounted on the outer periphery of the spiral plate corresponding to the hole. 5. The sludge dewatering device of claim 4, wherein the collection tank upstream transport path zone is formed with a float and a sediment inlet, respectively. A wastewater treatment apparatus comprising the solid-liquid separator for wastewater treatment of claim 1, wherein the treatment chemicals are mixed with the wastewater to coagulate and remove harmful substances with sludge. The wastewater treatment apparatus according to claim 6, further comprising the sludge dewatering apparatus of claim 4 downstream of the solid-liquid separator. The wastewater treatment apparatus according to claim 7, wherein the reaction tube and the stirring apparatus are further connected in series with the solid-liquid separator upstream.

Images