CN111701326A - A mud-water separation device for sewage treatment - Google Patents

Abstract

The invention belongs to the technical field of sewage treatment, and discloses a mud-water separation device for sewage treatment. The bottom of the filter cartridge is connected to the sewage collection pipe through a rotary joint; the filter cloth is pressed against each other by two fixed pressing rubber rollers outside the rotating filter cartridge to realize the wrapping of the filter cloth on the rotating filter cartridge; the filter cartridge transmission motor drives the central cylinder to rotate , the central cylinder drives each rotating filter cylinder to rotate through the filter cloth; at the same time, the filter cloth is provided with tension by the filter cloth tensioning system. The invention changes the vertical filtration of the traditional mud-water separation device to the horizontal filtration, which can increase the filtration area and increase the filtration speed, thereby increasing the surface load of the mud-water separation, reducing the floor space, increasing the concentration of the return sludge, and improving the reaction rate of the biological reaction tank. , reducing the investment of the mud-water separation tank and the biological reaction tank, and it can be made into any shape, which is more conducive to the combination arrangement.

Description

A mud-water separation device for sewage treatment

technical field

The invention belongs to the technical field of sewage treatment, and more specifically relates to a device for separating mud and water after a biological reaction tank in a sewage treatment plant.

Background technique

The pollutant discharge standard of domestic sewage treatment plants is getting higher and higher. The local discharge standards of cities and other places "Comprehensive Discharge Standard of Water Pollutants" (DB11/307-2013), "Pollutant Discharge Standard for Urban Sewage Treatment Plants" (DB12/599-2015), etc. The SS emission standard has been raised from the original 20mg/L to 10mg/L, and even to the local emission standard of 5mg/L.

In the process of improving the discharge standard, the sewage treatment process has also been upgraded from pretreatment + secondary treatment + mud water separation to pretreatment + secondary treatment + mud water separation + coagulation sedimentation filtration process, and then developed to the more common pretreatment + The process of secondary treatment + mud water separation + coagulation sedimentation + advanced oxidation + (denitrification) filtration. However, the sludge-water separation after biological treatment has not changed so far in terms of pool type, sedimentation method, and design parameters.

The traditional mud-water separation method has the advantages of stable treatment effect, low energy consumption and convenient operation and management under the discharge standards at that time. However, it also exposes four inherent shortcomings of the current mud-water separation process: 1. Low surface load for solid-liquid separation, large area required for a single tank, and large civil construction investment; the combination of circular sedimentation tanks reduces land use. Although the rectangular sedimentation tank has certain advantages in the combination of the tank body, it does not fundamentally improve the disadvantage of low surface load and large floor space. 2. Due to the gravity sludge collection method, the sludge does not need to settle. Generally, the return sludge concentration is only 6000-8000 mg/L. The return sludge concentration is low and requires a large amount of external return flow. On the one hand, it increases the energy consumption of the return flow and reduces the biological reaction on the other hand pool efficiency. Third, sludge bulking is prone to occur. 4. Since the flow state of the water in the pool is very important, it is related to the success or failure of mud-water separation, so the traditional mud-water separation needs to set up good water distribution channels and add hydraulic baffles.

With the improvement of emission standards, coagulation sedimentation + advanced oxidation + (denitrification) filtration and other processes have been added after the mud-water separation process section. The traditional mud-water separation process is no longer the gatekeeping process of the sewage treatment plant. If the traditional mud-water separation method is still adopted, it will be more prominent that the traditional mud-water separation pursues the precipitation effect too much, but will cause the coagulation and precipitation effect in the subsequent coagulation and precipitation section due to less binding substances. Not good, the disadvantages that affect the overall treatment effect of the process.

In order to change the disadvantages of the traditional sludge-water separation process, especially to increase the concentration of the return sludge, membrane filtration separation has been added on the basis of traditional gravity separation in recent years. The mud-water separation rate is high, the effluent SS is low, the floor area is small, and the sludge concentration of the reaction tank is high. However, the energy consumption during the membrane separation process is greatly increased. At the same time, in order to prevent membrane fouling, a large amount of blast aeration needs to be added. This will bring a large amount of dissolved oxygen to the front end of the reaction tank with the return of the sludge, reducing the denitrification and denitrification efficiency.

SUMMARY OF THE INVENTION

The invention focuses on solving the inherent shortcomings of traditional gravity separation of mud and water and membrane filtration separation, and provides a mud water separation device for sewage treatment, which organically combines traditional gravity separation and filtration separation, and is compatible with the current new discharge standards of domestic sewage plants. Adapted to reflect a new technical concept.

In order to solve the above-mentioned technical problems, the present invention is specifically realized through the following technical solutions:

A mud-water separation device for sewage treatment, comprising a pool body, a plurality of rotating filter cartridges uniformly distributed in concentric circles are arranged inside the pool body, and the cylindrical body of each of the rotating filter cartridges is provided with water permeable holes, and each The outside of the rotating filter cartridge is wrapped with a filter cloth covering the permeable holes; the bottom of each rotating filter cartridge is connected to a sewage collection pipe through a rotary joint; the filter cloth passes through two outside the rotating filter cartridge. The fixed pressing rubber rollers are pressed against each other to realize the wrapping of the filter cloth on the rotating filter cylinder; a center cylinder is arranged between the multiple rotating filter cylinders, and the center cylinder is driven by the filter cylinder transmission motor to rotate. , the filter cloth is wound around the outside of the central cylinder and successively bypasses each of the rotating filter cylinders, and the central cylinder drives each of the rotating filter cylinders to rotate through the filter cloth; at the same time, the filter cloth is made of The filter cloth tensioning system provides tension.

Further, the pool body is provided with a water inlet pipe and a water outlet main pipe, the water inlet pipe is communicated with the inside of the pool body, and the water outlet main pipe is connected with the sewage collection pipe.

Further, overflow weirs are arranged around the tank body.

Further, the top of the rotating filter cartridge is connected with a seat bearing through a reinforcing rib plate.

Further, the filter cloth tensioning system is composed of a tensioning spring, a tensioning swing arm, a tensioning rotating shaft, and a tensioning rubber roller, and the tensioning force of the filter cloth is provided by the tensioning spring, through the The tensioning swing arm generates torque and acts on the tensioning rotating shaft, and then transmits the force to the filter cloth through the tensioning rubber roller to complete the automatic tensioning of the filter cloth.

Further, a rotating brush is provided between the rotating filter cartridges, and the rotating brush acts on the surface of the filter cloth; the surface of the filter cloth at the entrance of the rotating brush is provided with a spray pipeline and a nozzle .

Further, a sludge pump is provided at the bottom of the tank body for discharging sludge.

The beneficial effects of the present invention are:

The invention changes the vertical filtration of the traditional mud-water separation device to the horizontal filtration through the unique arrangement of the filter cartridge and filter cloth and the transmission system, the filter cloth support system, the filter cloth tensioning system and the filter cloth cleaning system, which can increase the filter area, Increase the filtration speed, thereby increasing the surface load of the mud-water separation, reducing the floor space by at least half, increasing the return sludge concentration, increasing the reaction rate of the biological reaction tank, reducing the investment of the mud-water separation tank and the biological reaction tank, and No water distribution system is required, and it can be made into any shape, which is more convenient for combined arrangement.

Description of drawings

Fig. 1 is the elevation view of the mud-water separation device in the embodiment;

Fig. 2 is the plan view of the mud-water separation device in the embodiment;

3 is a plan view of the filter cloth tensioning system of the mud-water separation device in the embodiment;

Fig. 4 is the A-A sectional view of Fig. 3;

5 is a plan view of the filter cloth cleaning system of the mud-water separation device in the embodiment;

FIG. 6 is a B-B cross-sectional view of FIG. 5 .

In the above picture: 1- water inlet pipe, 2- overflow weir, 3- rotating filter cartridge, 4- filter cloth, 5- rotating joint, 6- sewage collection pipe, 7- water outlet main pipe, 8- pressing rubber roller, 9- Filter cylinder drive motor, 10- Center cylinder, 11- Tension spring, 12- Tension swing arm, 13- Tension rotating shaft, 14- Tension rubber roller, 15- Rotating brush, 16- Brush transmission Motor, 17-sprocket, 18-nozzle, 19-spray pipeline, 20-sludge pump.

Detailed ways

The present invention will be further described in detail below through specific examples. The following examples can make those skilled in the art understand the present invention more comprehensively, but do not limit the present invention in any way.

As shown in FIG. 1 and FIG. 2 , the present embodiment discloses a mud-water separation device for sewage treatment, including a pool body. The pool body is provided with a water inlet pipe 1 and a water outlet main pipe 7. The water inlet pipe 1 is used to The sewage separated from the mud and water is transported to the inside of the tank body, and the water outlet pipe 7 is used to discharge the treated sewage out of the tank body. An overflow weir 2 is arranged around the pool body, which is used to make the sewage transported by the water inlet pipe 1 flow evenly into the pool body.

A plurality of identical rotary filter cartridges 3 are arranged inside the pool body, each rotary filter cartridge 3 is vertically arranged with its axis, and the plurality of rotary filter cartridges 3 are evenly distributed concentrically in the horizontal direction. The cylindrical body of each rotating filter cartridge 3 is covered with water permeable holes, and the outside of the cylindrical body is wrapped with a filter cloth 4, which fully covers the water permeable holes. The sewage in the pool body completes the separation of mud and water during the process of passing through the filter cloth 4 and entering the interior of the rotating filter cartridge 3 .

The top of the rotary filter cartridge 3 is open and located above the liquid level in the tank body. The top of the rotary filter cartridge 3 is provided with a reinforcing rib plate and is connected to the connecting seat bearing above the tank body through the reinforcing rib plate. The bottom of the rotary filter cartridge 3 is provided with a constricted portion and is connected to the sewage collection pipe 6 through the rotary joint 5 . The sewage collection pipe 6 is connected to the water outlet main pipe 7, and the collected sewage is discharged out of the tank body through the water outlet main pipe 7.

All the rotating filter cartridges 3 are driven by the filter cloth 4 to rotate, and the filter cloth 4 is pressed against each other by two fixed pressing rubber rollers 8 outside each rotating filter cartridge 3 to realize the wrapping of the filter cloth 4 to the rotating filter cartridge 3 . A center cylinder 10 is arranged at the center between the plurality of rotating filter cylinders 3 , the center cylinder 10 is connected with a filter cylinder transmission motor 9 , and the central cylinder 10 is driven by the filter cylinder transmission motor 9 to rotate continuously. A whole circle of filter cloth 4 is wound around the center cylinder 10 and successively bypasses each rotating filter cylinder 3 . The filter cloth 4 transmits power to each rotating filter cylinder 3 through the rotation of the center cylinder 10 .

As shown in Figures 3 and 4, the entire circle of filter cloth 4 is provided with tension by the filter cloth tensioning system, thereby ensuring the effect of transmission and filtration. In this embodiment, the filter cloth tensioning system is mainly composed of a tensioning spring 11 , a tensioning swing arm 12 , a tensioning rotating shaft 13 , and a tensioning rubber roller 14 . One end of the tensioning spring 11 is fixed to the bracket above the tank body, and the other end is fixedly connected to one end of the tensioning swing arm 12 . The tensioning force of the filter cloth 4 is provided by the tensioning spring 11, the torque is generated by the tensioning swing arm 12, and acts on the tensioning rotating shaft 13, and then the tensioning rubber roller 14 transmits the force to the filter cloth 4, The automatic tensioning of the filter cloth 4 is completed.

As shown in FIG. 5 and FIG. 6 , the mud-water separation device of the present invention is further equipped with a filter cloth cleaning system, which is used to clean the filter cloth 4 at any time. In this embodiment, the filter cloth cleaning system is composed of a brush cleaning device and a spray device, including a rotating brush 15 , a brush transmission motor 16 , a sprocket 17 , a nozzle 18 , and a spray pipeline 19 . Several rotating brushes 15 are arranged on the surface of the filter cloth 4 to clean the sludge on the surface of the filter cloth 4 , so that the sludge is peeled off from the filter cloth 4 . The top of the rotating brush 15 is connected to the brush drive motor 16 through the sprocket 17, and the brush drive motor 16 provides rotational power, and under the transmission action of the sprocket 17, the rotating brush 15 is rotated, and the surface of the filter cloth 4 is completed. Sludge cleaning. Generally, the rotating brushes 15 are arranged on the path of the filter cloth 4 between the rotating filter cartridges 3 , and the two rotating brushes 15 can be driven by a brush transmission motor 16 through the sprocket 17 . A plurality of nozzles 18 longitudinally arranged on the spray pipeline 19 are provided at the entrance of the rotating brush 15 , and the cleaning effect is improved by pre-spraying before the rotating brush 15 cleans the filter cloth 4 .

The sludge separated by the filter cloth 4 falls into the bottom of the tank body, and is discharged from the tank body by the sludge pump 20 arranged at the bottom of the tank body, the excess sludge enters the sludge treatment system, and the remaining sludge is returned to the biological reaction tank. Mud and water separation.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. Under the inspiration of the present invention, without departing from the scope of the present invention and the protection scope of the claims, personnel can also make many specific transformations, which all fall within the protection scope of the present invention.

Claims (7)

1. A mud-water separation device for sewage treatment comprises a pool body and is characterized in that a plurality of rotary filter cylinders are uniformly distributed in the pool body in concentric circles, the cylinder body of each rotary filter cylinder is provided with a water permeable hole, and the outer part of each rotary filter cylinder is wrapped with filter cloth covering the water permeable hole; the bottom of the rotary filter cylinder is connected with a sewage collecting pipe through a rotary joint; the filter cloth is pressed against each other outside the rotary filter cylinder through two fixed pressing rubber rollers to wrap the rotary filter cylinder; a central cylinder is arranged among the rotary filter cylinders, the central cylinder is driven by a filter cylinder transmission motor to rotate, the filter cloth winds the outside of the central cylinder and sequentially and continuously winds around each rotary filter cylinder, and the central cylinder drives each rotary filter cylinder to rotate through the filter cloth; at the same time, the filter cloth is provided with a tensioning force by a filter cloth tensioning system.

2. The sludge-water separation device for sewage treatment as claimed in claim 1, wherein the tank body is provided with a water inlet pipeline and a water outlet main pipe, the water inlet pipeline is communicated with the inside of the tank body, and the water outlet main pipe is connected with the sewage collecting pipe.

3. The apparatus of claim 1, wherein the tank body is provided with an overflow weir at its periphery.

4. The mud-water separator for sewage treatment according to claim 1, wherein the top of the rotary filter cartridge is connected with an adapter bearing through a reinforcing rib plate.

5. The sludge-water separation device for sewage treatment according to claim 1, wherein the filter cloth tensioning system is composed of a tensioning spring, a tensioning swing arm, a tensioning rotary shaft and a tensioning rubber roll, the tensioning force of the filter cloth is provided by the tensioning spring, the tensioning swing arm generates torque and acts on the tensioning rotary shaft, and the tensioning rubber roll transmits acting force to the filter cloth to complete automatic tensioning of the filter cloth.

6. The mud-water separation device for sewage treatment as claimed in claim 1, wherein a rotary brush is arranged between the rotary filter cartridges, and the rotary brush acts on the surface of the filter cloth; and a spraying pipeline and a nozzle are arranged on the surface of the filter cloth in the inlet direction of the rotary brush.

7. The sludge-water separation device for sewage treatment as claimed in claim 1, wherein a sludge pump is provided at the bottom of the tank body for discharging sludge.

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