An integrated MBR sewage treatment station and treatment method

Abstract

The present invention relates to an integrated MBR sewage treatment station and a treatment method, and belongs to the technical field of sewage treatment. The integrated MBR sewage treatment station includes an anoxic tank, an aerobic tank and a membrane tank. The anoxic tank and the aerobic tank surround the outside of the membrane tank. The two ends of the anoxic tank are respectively connected to the two ends of the aerobic tank through a water channel and a rotary return gate. It also includes a water distribution area and a sludge return area. The water distribution area and the sludge return area are respectively located on the opposite sides of the membrane tank, and are respectively located on the side of the anoxic tank and the aerobic tank close to the membrane tank. The present invention makes full use of the space of the sewage treatment station, shortens the distance between adjacent processes, and can better save floor space through the special structure and arrangement of the anoxic tank, aerobic tank, membrane tank, water distribution area and sludge return area, greatly shortening the entire sewage treatment process and saving sewage treatment costs.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and relates to an integrated MBR sewage treatment station and a treatment method. Background Art

[0002] Membrane bioreactor (MBR) is a biochemical reaction system that integrates membrane separation technology and biodegradation of bioreactors. It is a development process of the traditional activated sludge method, which realizes the complete separation of hydraulic retention time and sludge retention time, has flexible operation control, and is easy to achieve full automation control from water inlet to water outlet. As a biochemical and deep treatment process, the integrated MBR process has obvious advantages in terms of reagent usage, sludge output, low carbon, green environmental protection, etc. It has extremely high pollutant removal efficiency, excellent and stable water quality, and the main indicators of effluent meet the surface water Class III water body standards. It can be used as a supplementary water source for drinking water sources and is very suitable for the reconstruction of old urban areas. However, the current MBR process occupies a relatively large area, the overall structure is not very reasonable, and the cost is still high. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, one of the objects of the present invention is to provide an integrated MBR sewage treatment plant, and the second object of the present invention is to provide an integrated MBR sewage treatment method.

[0004] One of the purposes of the present invention is achieved by the following technical solution:

[0005] An integrated MBR sewage treatment station comprises an anoxic tank, an aerobic tank and a membrane tank, wherein the anoxic tank and the aerobic tank surround the outside of the membrane tank, and the two ends of the anoxic tank are respectively connected to the two ends of the aerobic tank through a water channel and a rotary return gate, and further comprises a water distribution area and a sludge return area, wherein the water distribution area and the sludge return area are respectively located on the opposite sides of the membrane tank and are respectively located on the side of the anoxic tank and the aerobic tank close to the membrane tank.

[0006] As a preferred technical solution of the present invention, a group of relative pool walls of the anoxic pool and the aerobic pool are bent toward the membrane pool to form an arc shape, and the anoxic pool and the aerobic pool are connected to form a ring structure.

[0007] As a preferred technical solution of the present invention, one opposite side wall of the membrane pool is bent outward to form an arc-shaped pool wall, one of which is in contact with the inner pool wall of the anoxic pool, and the other is in contact with the inner pool wall of the aerobic pool.

[0008] As a preferred technical solution of the present invention, the water distribution area and the sludge reflow area are respectively located in the gap between the other opposite side wall of the membrane pool and the annular structure.

[0009] As a preferred technical solution of the present invention, the anoxic pool is provided with an inlet pipe, a vent pipe and a plurality of anoxic pool flow producers, one end of the inlet pipe is communicated with the anoxic pool, one end of the vent pipe is communicated with the inlet pipe, and the plurality of anoxic pool flow producers are evenly distributed in the anoxic pool.

[0010] As a preferred technical solution of the present invention, a plurality of liftable tubular aerators and a plurality of aerobic pool flow promoters are distributed in the aerobic pool, and each of the liftable tubular aerators is connected to an air riser respectively.

[0011] As a preferred technical solution of the present invention, multiple groups of ultrafiltration flat membrane assemblies are distributed in the membrane pool, each group of the ultrafiltration flat membrane assemblies includes multiple groups of flat membrane filters and water outlet pipes, multiple groups of the flat membrane filters are distributed on both sides of the water outlet pipe, and each of the flat membrane filters is connected to the water outlet pipe respectively.

[0012] The second object of the present invention is achieved by adopting the following technical solution:

[0013] An integrated MBR sewage treatment method comprises the following steps:

[0014] S1: The sewage enters the anoxic tank through the water inlet pipe, and the denitrifying bacteria in the anoxic tank remove the nitrate nitrogen mixed in the sewage;

[0015] S2: The sewage enters the aerobic tank from the anoxic tank, and the aerobic microorganisms in the aerobic tank degrade the organic matter and ammonia nitrogen in the sewage;

[0016] S3: Part of the sewage in the aerobic tank enters the anoxic tank for mixed liquid reflux, and the other part of the sewage in the aerobic tank enters the water distribution area;

[0017] S4: The water in the water distribution area enters the membrane pool and is filtered through the ultrafiltration flat membrane assembly to separate the sludge and clean water. The clean water flows out of the membrane pool through the outlet pipe, and the sludge mixed liquid enters the sludge return area;

[0018] S5: The mixed liquor is pumped into the anoxic tank and the aerobic tank respectively through the mixed liquor return pump to complete the mixed liquor return, and the sludge in the sludge return area is pumped into the sludge dewatering room through the sludge pump.

[0019] As a preferred technical solution of the present invention, in the aerobic tank, the sewage is stirred by the aerobic tank flow promoter to make the sewage fully contact with the microorganisms, and oxygen is provided to the sewage by microporous aeration.

[0020] As a preferred technical solution of the present invention, the clean water flowing out of the water pipe of the membrane pool is disinfected by ultraviolet rays before being discharged.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention surrounds the anoxic tank and the aerobic tank outside the membrane tank, connects the two ends of the anoxic tank to the two ends of the aerobic tank through a water channel and a rotary return gate, and arranges the water distribution area and the sludge return area on the opposite side of the membrane tank and on the side of the anoxic tank and the aerobic tank close to the membrane tank, thereby fully utilizing the space of the sewage treatment station and shortening the distance between adjacent processes. Through this special structure and arrangement, the floor space can be better saved, the entire sewage treatment process can be greatly shortened, and the sewage treatment cost is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 Flow chart of sewage treatment;

[0025] In the figure: 1. Anoxic tank; 11. Water inlet pipe; 12. Vent pipe; 13. Anoxic tank flow generator; 2. Aerobic tank; 21. Liftable tubular aerator; 22. Aerobic tank flow generator; 3. Membrane tank; 31. Flat membrane filter; 32. Outlet pipe; 4. Water distribution area; 5. Sludge return area. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Preferred embodiments of the present invention are provided in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0027] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] Example 1: See attached Figure 1-Figure 2 An integrated MBR sewage treatment station includes an anoxic tank 1, an aerobic tank 2, a membrane tank 3, a water distribution area 4 and a sludge return area 5. The anoxic tank 1 and the aerobic tank 2 surround the outer side of the membrane tank 3. The two ends of the anoxic tank 1 are respectively connected to the two ends of the aerobic tank 2 through a water channel and a rotary return gate. The water distribution area 4 and the sludge return area 5 are respectively located on the opposite side of the membrane tank 3, and are respectively located on the side of the anoxic tank 1 and the aerobic tank 2 close to the membrane tank 3. A plurality of water distribution holes are opened between the aerobic tank 2 and the water distribution area 4, and a water distribution gate is arranged in the water distribution hole. Gates are respectively arranged between the water distribution area 4 and the membrane tank 3, between the membrane tank 3 and the sludge return area 5, between the sludge return area 5 and the anoxic tank 1, and between the sludge return area 5 and the aerobic tank 2. A mixed liquor return pump and a sludge pump are arranged in the sludge return area 5. The gate is normally open or half open. When the membrane is cleaned offline, the first gate and the second gate of the corresponding membrane pool 3 are closed, and they are turned normally open after cleaning.

[0030] Anoxic pool 1 is provided with an inlet pipe 11, a vent pipe 12, a carbon adding pipe and a plurality of anoxic pool flow promoters 13. One end of the inlet pipe 11 is communicated with the anoxic pool 1, and one end of the vent pipe 12 is communicated with the inlet pipe 11. A plurality of anoxic pool flow promoters 13 are evenly distributed in the anoxic pool 1. In the preparation stage, a mixture of anoxic sludge and water is added to the anoxic pool 1, and the anoxic pool 1 is placed in an anoxic state. By providing the anoxic pool flow promoter 13, during the anoxic reaction process, sewage and anoxic sludge can be fully mixed and the anoxic sludge can be prevented from settling, so that the anoxic reaction is more complete. Sodium acetate is added to the anoxic pool 1 through the carbon adding pipe to provide a carbon source for the anoxic process when the denitrification efficiency is low in winter.

[0031] A plurality of liftable tubular aerators 21 and a plurality of aerobic pool flowmakers 22 are distributed in the aerobic pool 2. Each liftable tubular aerator 21 is connected to an air riser, and the liftable tubular aerator 21 is used to oxygenate the aerobic pool 2, so that the aerobic pool 2 is kept in an aerobic state. In the preparation stage, a mixture of aerobic sludge and water is added to the aerobic pool 2. By setting the aerobic pool flowmaker 22, during the aerobic reaction process, the sewage and the aerobic sludge can be fully mixed and the aerobic sludge can be prevented from settling, so that the aerobic reaction is more complete.

[0032] PAC is added into the membrane pool 3 and the water distribution area 4 to remove phosphorus from the sewage.

[0033] The sewage flowing out of the municipal pipeline network first enters the fine screen pool through the integrated pump station, and then flows into the cyclone sand settling tank to remove larger and finer debris and sand particles in the sewage. The sewage from the cyclone sand settling enters the fine screen after metering to ensure that the faulty materials are cleaned to the greatest extent, reduce the physical damage of the MBR, reduce the surface pollution in the membrane components, and pre-treat the sewage first.

[0034] The sewage flowing out of the fine screen enters the anoxic tank 1 through the water inlet pipe 11, and anoxic reaction is carried out in the anoxic tank 1, and nitrogen organic matter mixed in the sewage is removed by denitrifying bacteria; then the water channel is opened, and the sewage enters the aerobic tank 2, and then the water channel is closed, and the organic matter and ammonia nitrogen in the sewage are degraded by aerobic microorganisms in the aerobic tank 2; after the aerobic reaction is completed, part of the mixed liquid enters the anoxic tank 1 through the rotary reflux gate to complete the mixed liquid reflux, and after the reflux is completed, the rotary reflux gate is closed and the water distribution gate is opened, and the other part The sewage enters the water distribution area 4, through which it is distributed; the sewage enters the membrane pool 3 through the gate, and is pumped to the subsequent disinfection pool through the negative pressure axial suction pump and the ultrafiltration flat membrane to be discharged or reused in the factory after the purified sewage is discharged in compliance with the standards. The mixed liquid is pumped into the anoxic pool 1 and the aerobic pool 2 respectively through the mixed liquid reflux pump to complete the mixed liquid reflux, and the sludge is pumped into the sludge dewatering room through the sludge pump. The dehydrated mud cake is transported to a qualified company for comprehensive utilization, and the compressed liquid is mixed with the sewage flowing out of the municipal pipe network and enters the sewage treatment process.

[0035] The present invention makes full use of the space of the sewage treatment station and shortens the distance between adjacent processes. Through the special structure and arrangement of the anoxic tank 1, the aerobic tank 2, the membrane tank 3, the water distribution area 4 and the sludge return area 5, the floor space can be better saved, the entire sewage treatment process is greatly shortened, and the sewage treatment cost is saved.

[0036] like Figure 1 As shown, a set of opposite pool walls of the anoxic pool 1 and the aerobic pool 2 are bent toward the membrane pool 3 to form an arc shape, and the anoxic pool 1 and the aerobic pool 2 are connected to form a ring structure. One opposite side wall of the membrane pool 3 is bent outward to form an arc pool wall, one of which is in contact with the inner pool wall of the anoxic pool 1, and the other is in contact with the inner pool wall of the aerobic pool 2. The water distribution area 4 and the sludge return area 5 are respectively located in the gap between the other opposite side wall of the membrane pool 3 and the ring structure.

[0037] like Figure 1As shown, multiple groups of ultrafiltration flat membrane assemblies and negative pressure axial suction pumps are distributed in the membrane pool 3, and each group of ultrafiltration flat membrane assemblies includes multiple groups of flat membrane filters 31 and water outlet pipes 32, multiple groups of flat membrane filters 31 are distributed on both sides of the water outlet pipe 32, and each flat membrane filter 31 is connected to the water outlet pipe 32. Through the negative pressure axial suction pump, the clean water separated by the flat membrane filter 31 flows out of the membrane pool 3 through the water outlet pipe 32. One or more perforated pipes are also provided at both ends of the membrane pool 3, and each perforated pipe is connected to a riser, and oxygen is supplied to the membrane pool 3 through the riser and the perforated pipe to avoid sludge deposition and insufficient aeration. A drug supply pipeline is also provided in the membrane pool 3, and PAC is added to the membrane pool 3 through the drug supply pipeline to remove phosphorus from the sewage in the membrane pool 3.

[0038] Embodiment 2: An integrated MBR sewage treatment method comprises the following steps:

[0039] Pretreatment: The sewage first enters the fine screen tank through the integrated pump station, and then flows into the cyclone sand settling tank to remove larger and finer debris and sand particles in the sewage. The sewage from the cyclone sand settling enters the fine screen after metering, ensuring that the faulty substances are cleaned to the greatest extent, reducing the physical damage of the MBR and reducing the surface pollution in the membrane components;

[0040] S1: The sewage flowing out from the fine screen enters the anoxic tank 1 through the water inlet pipe 11, and the nitrate nitrogen mixed in the sewage is removed by the denitrifying bacteria in the anoxic tank 1;

[0041] S2: The sewage enters the aerobic tank 2 from the anoxic tank 1, and the organic matter and ammonia nitrogen in the sewage are degraded by the aerobic microorganisms in the aerobic tank 2. During the degradation process, the sewage is stirred by the aerobic tank flow promoter 22 to make the sewage fully contact with the microorganisms, and oxygen is provided to the sewage by microporous aeration;

[0042] S3: part of the sewage in the aerobic tank 2 enters the anoxic tank 1 for mixed liquid reflux, and the other part of the sewage in the aerobic tank 2 enters the water distribution area 4;

[0043] S4: The water in the water distribution area 4 enters the membrane pool 3 and is filtered through the ultrafiltration flat membrane assembly to separate the sludge and clean water. The clean water flows out of the membrane pool 3 through the outlet pipe 32, and the sludge mixed liquid enters the sludge return area 5;

[0044] S5: The mixed liquid is pumped into the anoxic tank 1 and the aerobic tank 2 respectively through the mixed liquid reflux pump to complete the mixed liquid reflux, and the sludge in the sludge reflux area 5 is pumped into the sludge dewatering room through the sludge pump.

[0045] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An integrated MBR sewage treatment station, comprising an anoxic tank, an aerobic tank and a membrane tank, characterized in that: The anoxic pool and the aerobic pool surround the outside of the membrane pool, and the two ends of the anoxic pool are connected to the two ends of the aerobic pool through a water channel and a rotary return gate, and also include a water distribution area and a sludge return area, the water distribution area and the sludge return area are respectively located on the opposite side of the membrane pool, and are respectively located on the side of the anoxic pool and the aerobic pool close to the membrane pool; A set of opposite pool walls of the anoxic pool and the aerobic pool are bent toward the membrane pool to form an arc shape, and the anoxic pool and the aerobic pool are connected to form a ring structure; The opposite side walls of the membrane pool are bent outward to form arc-shaped pool walls, one of which is in contact with the inner pool wall of the anoxic pool, and the other is in contact with the inner pool wall of the aerobic pool; The water distribution area and the sludge reflow area are respectively located in the gap between the other opposite side wall of the membrane pool and the annular structure.

2. An integrated MBR sewage treatment plant as claimed in claim 1, characterized in that: The anoxic pool is provided with an inlet pipe, a vent pipe and a plurality of anoxic pool flow promoters, one end of the inlet pipe is communicated with the anoxic pool, one end of the vent pipe is communicated with the inlet pipe, and the plurality of anoxic pool flow promoters are evenly distributed in the anoxic pool.

3. The integrated MBR sewage treatment plant according to claim 1, characterized in that: A plurality of liftable tubular aerators and a plurality of aerobic pool flow promoters are distributed in the aerobic pool, and each of the liftable tubular aerators is connected to an air riser respectively.

4. The integrated MBR sewage treatment plant according to claim 1, characterized in that: There are multiple groups of ultrafiltration flat membrane components distributed in the membrane pool, each group of ultrafiltration flat membrane components includes multiple groups of flat membrane filters and water outlet pipes, multiple groups of flat membrane filters are distributed on both sides of the water outlet pipe, and each flat membrane filter is connected to the water outlet pipe.

5. An integrated MBR sewage treatment method applied to an integrated MBR sewage treatment plant as claimed in claim 1, characterized in that: The following steps are involved: S1: The sewage enters the anoxic tank through the water inlet pipe, and the denitrifying bacteria in the anoxic tank remove the nitrate nitrogen mixed in the sewage; S2: The sewage enters the aerobic tank from the anoxic tank, and the aerobic microorganisms in the aerobic tank degrade the organic matter and ammonia nitrogen in the sewage; S3: Part of the sewage in the aerobic tank enters the anoxic tank for mixed liquid reflux, and the other part of the sewage in the aerobic tank enters the water distribution area; S4: The water in the water distribution area enters the membrane pool and is filtered through the ultrafiltration flat membrane assembly to separate the sludge and clean water. The clean water flows out of the membrane pool through the outlet pipe, and the sludge mixed liquid enters the sludge return area; S5: The mixed liquor is pumped into the anoxic tank and the aerobic tank respectively through the mixed liquor return pump to complete the mixed liquor return, and the sludge in the sludge return area is pumped into the sludge dewatering room through the sludge pump.

6. An integrated MBR sewage treatment method as claimed in claim 5, characterized in that: In the aerobic tank, the sewage is stirred by the aerobic tank flow promoter to allow the sewage to fully contact with microorganisms, and oxygen is provided to the sewage through microporous aeration.

7. An integrated MBR sewage treatment method as claimed in claim 5, characterized in that: The clean water flowing out of the membrane pool water pipe is disinfected by ultraviolet rays before being discharged.

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