CN219079309U

CN219079309U - Integrated MBR (Membrane biological reactor)

Info

Publication number: CN219079309U
Application number: CN202320171501.0U
Authority: CN
Inventors: 王聿琳; 杨磊; 杨冠; 罗华飞
Original assignee: Jiangsu Strait Environmental Protection Technology Development Co ltd
Current assignee: Jiangsu Strait Environmental Protection Technology Development Co ltd
Priority date: 2023-02-09
Filing date: 2023-02-09
Publication date: 2023-05-26
Anticipated expiration: 2033-02-09

Abstract

The utility model discloses an integrated MBR (Membrane biological reactor) membrane biological reaction device, and belongs to the technical field of sewage treatment. Units with different treatment capacities and functions such as biochemical reaction, nitrifying liquid reflux, flocculation precipitation, disinfection and sterilization are orderly integrated into a whole, the denitrification capacity in sewage treatment is enhanced by using the front-end anoxic tank through inverting the AAO coupling MBR process form, the impact of dissolved oxygen in mixed liquid reflux on an anaerobic tank is reduced, and meanwhile, the MBR membrane process is utilized to increase the number and diversity of microorganisms, so that sewage is effectively treated, and the membrane pollution problem is relieved.

Description

Integrated MBR (Membrane biological reactor)

Technical Field

The utility model belongs to the technical field of sewage treatment, and particularly relates to an integrated MBR (Membrane biological reactor).

Background

With the development of economy and the continuous acceleration of urban process, the water environment management of China faces more and more challenges, the sewage treatment is extended from the city to the villages and towns, and how to collect sewage is a difficult point in the treatment process. To solve this problem, the past centralized treatment is changed into the decentralized treatment to become the trend of village and town sewage treatment. Therefore, how to convert the prior large-water-volume engineering sewage treatment plant into miniaturized or integrated process equipment capable of realizing assembly rapidly becomes the research focus of the current sewage treatment industry.

A Membrane Bioreactor (MBR) is used as a novel sewage treatment system organically combining a Membrane separation technology and a biological treatment technology, and utilizes ultrafiltration or microfiltration membranes to realize efficient interception of sludge, so that the concentration of microorganisms can be effectively improved, and the novel sewage treatment system has the advantages of good solid-liquid separation, strong treatment capacity, stable effluent quality, occupied land, low residual sludge yield and the like. Due to the above advantages, MBR membrane bioreactors have been widely used, and gradually become an important technical means in the integrated sewage treatment process.

MBR technology is also facing a number of challenges and obstacles as a technology that is being scaled up and rapidly developed: 1. the biological treatment and the membrane interception in the integrated aerobic membrane bioreactor are combined, so that the high-efficiency removal of pollutants such as ammonia nitrogen, BOD, SS, turbidity and the like in the sewage can be realized, but the reflux sludge in the conventional anaerobic and aerobic combined reaction device contains higher dissolved oxygen, the anaerobic function of the reflux sludge is difficult to realize in the actual working condition, and the total nitrogen removal effect is relatively poor; 2. the aeration quantity is regulated in the normal biological treatment process to control reasonable dissolved oxygen, and the combined back flushing of air and water exists in the back flushing process, so that the control requirement of the aeration quantity of the MBR membrane is relatively high; 3. in practical application, the MBR membrane is easily blocked by organic and inorganic pollutants in sewage, so that the transmembrane pressure difference is increased, and the membrane flux is reduced.

Disclosure of Invention

1. Problems to be solved

Aiming at the problems of poor total nitrogen removal effect, easiness in causing membrane pollution and the like in the prior art, the utility model provides an integrated MBR membrane biological reaction device. The utility model orderly integrates units with different treatment capacities and functions such as biochemical reaction, nitrifying liquid reflux, flocculation precipitation, disinfection and sterilization and the like into a whole, enhances the denitrification capacity in sewage treatment by utilizing the front of an anoxic tank through inverting an AAO coupling MBR process form, reduces the impact of dissolved oxygen in mixed liquid reflux on the anaerobic tank, and simultaneously increases the number and diversity of microorganisms by utilizing an MBR membrane process, so that sewage is effectively treated and the problem of membrane pollution is relieved.

2. Technical proposal

In order to solve the problems, the technical scheme adopted by the utility model is as follows:

the utility model relates to an integrated MBR (Membrane biological reactor) membrane biological reaction device which sequentially comprises an adjusting tank, an anoxic tank, an anaerobic tank and an aerobic combined MBR membrane tank, wherein a lifting pump is arranged in the adjusting tank, and the adjusting tank is connected with the anoxic tank through a pipeline by virtue of the lifting pump; an upper inlet pipe and a lower outlet pipe are arranged above the anoxic tank, and the anoxic tank is connected with the anaerobic tank through the upper inlet pipe and the lower outlet pipe;

an MBR membrane frame is arranged in the aerobic combined MBR membrane tank, an aeration device is arranged below the MBR membrane frame, the aeration device is connected with an external fan through a pipeline, a suction pipe is arranged at the top of the MBR membrane frame, a back flushing pipe is arranged at the bottom of the MBR membrane frame, the suction pipe is connected with a suction pump through a pipeline, and the back flushing pipe is connected with the back flushing pump through a pipeline; and the bottom of the aerobic combined MBR membrane tank is provided with a mixed liquid reflux pump, and the aerobic combined MBR membrane tank is connected with the anoxic tank through a reflux pipe by the mixed liquid reflux pump.

Preferably, a floating ball liquid level controller is arranged in the regulating tank.

Preferably, an electromagnetic flowmeter is arranged on a pipeline connected with the lift pump and the anoxic tank.

Preferably, a hydraulic stirrer is arranged in the anoxic tank.

Preferably, an overflow port is arranged at the top of the aerobic combined MBR membrane tank, and overflow water flows back to the regulating tank through the overflow port.

Preferably, the aeration device comprises a microporous aeration disc and an aeration main pipe, and the aeration main pipe is connected with the microporous aeration disc through a pipeline.

The utility model relates to an integrated MBR (Membrane biological reactor), which also comprises a clean water tank, wherein the clean water tank is connected with an aerobic combined MBR membrane tank through a water collecting pipe.

Preferably, the integrated MBR membrane biological reaction device further comprises a device room, wherein a PAC dosing tank and a NaClO dosing tank are arranged in the device room, the PAC dosing tank and the NaClO dosing tank are connected with a clean water tank through pipelines, and pipeline mixers are arranged on pipelines connected with the clean water tank through the PAC dosing tank and the NaClO dosing tank.

Preferably, a citric acid dosing tank is arranged in the equipment room and is connected with the backwashing pipe through a pipeline.

Preferably, a residual sludge pump is arranged in the setting room.

3. Advantageous effects

Compared with the prior art, the utility model has the beneficial effects that:

(1) The integrated MBR membrane biological reaction device orderly integrates units with different treatment capacities and actions such as biochemical reaction, nitrifying liquid backflow, flocculation precipitation, disinfection and sterilization into a whole, saves investment of large-scale equipment, reduces the occupied area of the equipment, and provides a reasonable and effective treatment device for dispersed sewage treatment;

(2) According to the integrated MBR membrane biological reaction device, the anaerobic tank is pre-positioned by inverting the AAO coupling MBR process form, so that the denitrification capacity in sewage treatment is enhanced, the impact of dissolved oxygen in mixed liquid reflux on the anaerobic tank is reduced, and meanwhile, the MBR membrane process is utilized to increase the number and diversity of microorganisms, so that the microorganism treatment modes are diversified;

(3) According to the integrated MBR membrane biological reaction device, the control mode of the MBR membrane biological reaction device is integrated, the degree of automation is high, the control logic of normal water production, aeration and back flushing is relatively simple, the manual intervention in the whole treatment process is less, no special personnel is required, and the accurate control of the integrated MBR membrane biological reaction device is realized;

(4) According to the integrated MBR membrane biological reaction device, backwashing aeration blowing is continuously carried out on the surface of an MBR membrane, a double fan is started during MBR membrane backwashing, the aeration amount is increased, the MBR membrane backwashing effect is improved, and the membrane pollution problem is relieved.

Drawings

FIG. 1 is a schematic structural view of an integrated MBR membrane bioreactor according to the present utility model;

FIG. 2 is a schematic structural diagram of an aeration control mode of an integrated MBR membrane bioreactor according to the present utility model;

FIG. 3 is a schematic view of a water production control mode structure of an integrated MBR membrane bioreactor according to the present utility model;

FIG. 4 is a schematic structural diagram of a backwash control mode of an integrated MBR membrane bioreactor according to the present utility model;

in the figure:

100. an adjusting tank; 110. a lift pump; 120. a float level controller; 130. an electromagnetic flowmeter;

200. an anoxic tank; 201. a device water inlet; 202. an anoxic pond observation hole; 210. a hydraulic stirrer;

220. an upper inlet and outlet pipe; 300. an anaerobic tank; 302. an observation hole of the anaerobic tank; 310. a return pipe;

400. an aerobic combined MBR membrane tank; 402. an aerobic combined MBR membrane Chi Renkong; 410. MBR membrane frame;

420. an aeration device; 4201. a microporous aeration disc; 4202. an aeration dry pipe; 4210. roots blower;

430. a suction tube; 440. a back flushing pipe; 450. an overflow port; 460. a mixed liquid reflux pump;

500. a clean water tank; 501. a water outlet pipe of the equipment; 502. an electric valve; 503. a clean water tank water inlet pipe;

504. a pipe mixer; 505. a hose; 506. PAC dosing tank; 507. a NaClO dosing tank;

508. a citric acid dosing tank; 600. the equipment room; 610. a residual sludge pump; 620. a suction pump;

6210. a water collecting pipe; 630. and a backwash pump.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1, the integrated MBR membrane bioreactor of the present utility model sequentially comprises an adjusting tank 100, an anoxic tank 200, an anaerobic tank 300, an aerobic combined MBR membrane tank 400, a clean water tank 500 and an inter-device 600, wherein a lift pump 110 and a floating ball liquid level controller 120 are arranged in the adjusting tank 100, the adjusting tank 100 is connected with the anoxic tank 200 through a pipeline via the lift pump 110, and an electromagnetic flowmeter 130 is arranged on the pipeline connecting the lift pump 110 with the anoxic tank 200; the anaerobic tank 200 is internally provided with a hydraulic stirrer 210, an upper inlet pipe and a lower outlet pipe 220 are arranged above the anaerobic tank 200, the anaerobic tank 200 is connected with an anaerobic tank 300 through the upper inlet pipe and the lower outlet pipe 220, a suspension type three-dimensional elastic filler is arranged in the anaerobic tank 300, and a backflow inlet (not shown) is arranged at the bottom of the anaerobic tank 200;

an MBR membrane frame 410 is arranged in the aerobic combined MBR membrane tank 400, MBR is a hollow fiber membrane and made of polyvinylidene fluoride (PVDF), an aeration device 420 is arranged below the MBR membrane frame 410, the aeration device 420 is connected with an external fan through a pipeline, and the external fan is a Roots fan 4210; the top of the MBR membrane frame 410 is provided with a suction pipe 430, the bottom of the MBR membrane frame 410 is provided with a back flushing pipe 440, the suction pipe 430 is connected with a suction pump 620 through a pipeline, and the back flushing pipe 440 is connected with a back flushing pump 630 through a pipeline; and a mixed liquor reflux pump 460 is arranged at the bottom of the aerobic combined MBR membrane tank 400, the aerobic combined MBR membrane tank 400 is connected with a reflux inlet of the anoxic tank 200 through a reflux pipe 310 by the mixed liquor reflux pump 460, an overflow port 450 is arranged at the top of the aerobic combined MBR membrane tank 400, and overflow effluent flows back to the regulating tank 100 through the overflow port 450.

As shown in fig. 2, the aeration device 420 includes a microporous aeration disc 4201 and an aeration trunk 4202, the aeration trunk 4202 is connected to the microporous aeration disc 4201 through a pipe, and the aeration trunk 4202 is connected to the Roots blower 4210 through a pipe.

In addition, the clean water tank 500 is connected with the aerobic combined MBR membrane tank 400 through a water collecting pipe 6210. As shown in fig. 3, a PAC dosing tank 506 and a NaClO dosing tank 507 are disposed in the equipment room 600, the PAC dosing tank 506 and the NaClO dosing tank 507 are connected with the clean water tank 500 through pipelines, and a pipeline mixer 504 and an electric valve 502 are disposed on the pipelines connecting the PAC dosing tank 506 and the NaClO dosing tank 507 with the clean water tank 500. As shown in fig. 4, a residual sludge pump 610 and a citric acid dosing tank 508 are further disposed in the equipment room 600, the citric acid dosing tank 508 is connected with the backwash pipe 440 through a pipeline, and the residual sludge pump 610 is used for discharging residual sludge of the system.

The sewage treatment control mode of the integrated MBR membrane biological reaction device comprises a device water production control mode, a device aeration control mode and a device back flushing control mode. The water production control mode comprises a mode one: raw water is sucked from the outer side of the MBR hollow fiber membrane to enter the membrane wall through negative pressure suction of a suction pump 620, produced water of each group of membrane modules is firstly collected into a clean water tank 500 through a water collecting pipe 6210, and the produced water is automatically converted into a second control mode through a floating ball control valve of the clean water tank 500 after reaching a certain liquid level; mode two: the water produced by the suction pump 620 is directly discharged to a sewage discharge port, the suction pump 620 is linked with a PAC and NaClO dosing metering pump, wherein the water production time of the MBR membrane reaction device is set to be 7-9 minutes, the operation is stopped for 1-3 minutes, and the backwashing aeration purging is continuously carried out on the surface of the MBR membrane by using the stopping time.

The aeration control mode comprises a mode one: during conventional aeration, a single fan is started, and the dissolved oxygen of the aerobic combined MBR membrane tank is controlled to be more than 2mg/L; mode two: when the MBR membrane is backwashed, the double fans are started, the aeration rate is increased, and the MBR membrane backwashed effect is improved.

The back flush control mode comprises a mode one: daily water washing is carried out for 4 to 6 times per day, the water washing time is controlled for 2 to 4 minutes each time, and the water washing strength is controlled for 20 to 40L/m ² H, back flushing the MBR membrane from inside to outside by a back flushing water pump; mode two: the back washing is enhanced, the back washing pump is linked with a citric acid or NaClO dosing pump according to different pollutants, the dosing back washing is controlled for 2-4 times per week, and the running time of the dosing pump is 1-3 minutes; mode three: on-line cleaning, automatically generating a transmembrane pressure difference curve through a data accumulation PLC, controlling the system to perform on-line cleaning according to the transmembrane pressure difference average data within 30 continuous days being higher than 0.05MPa, injecting liquid medicine into the membrane wire by using a back flushing water pump and a medicine adding pump, and slowly exuding and soaking the cleaning liquid medicine from the inside of the membrane wire, wherein the soaking time is controlled to be 1-4 hours.

Example 1

The embodiment is to treat rural sewage treatment sites in a certain area with a treatment scale of 50m ³ /d。

The integrated MBR membrane biological reaction device of the embodiment comprises an adjusting tank 100, an anaerobic tank 200, an aerobic combined MBR membrane tank 300, a clean water tank 400 and an equipment room 500, wherein a floating ball liquid level controller 120 is arranged in the adjusting tank 100, the adjusting tank 100 is connected into the integrated equipment anoxic tank 200 through a top water outlet pipe by a lifting pump 110, and an electromagnetic flowmeter 130 is arranged on a water outlet pipe of the lifting pump 110; the anoxic tank 200 is internally provided with a hydraulic stirrer 210, the anoxic tank 200 automatically flows into the anaerobic tank 300 through an upper inlet pipe 220 and a lower outlet pipe 220, and the anoxic tank 200 is internally provided with an anoxic tank observation hole 202; a suspension type three-dimensional elastic filler is arranged in the anaerobic tank 300, the anaerobic tank 300 overflows to the aerobic combined MBR membrane tank 400 through a top water outlet hole, and an anaerobic tank observation hole 302 is arranged in the anaerobic tank 300; an aerobic combined MBR membrane Chi Renkong 402 is arranged in the aerobic combined MBR membrane tank 400, the aerobic combined MBR membrane tank 400 discharges water through a suction pump 620 in the equipment room 600, and the discharged water is discharged through an equipment water outlet pipe 501.

The process of sewage treatment by adopting the integrated MBR membrane biological reaction device of the embodiment is as follows:

the sewage enters the anoxic tank 200 through a pipeline via a device water inlet 201 by a lifting pump 110 in the regulating tank 100, is uniformly mixed under the action of a hydraulic stirrer 210 of the anoxic tank 200, flows to the bottom of the anaerobic tank 300, and hydrolyzes and acidizes substances difficult to degrade in the sewage under anaerobic conditions; the effluent of the anaerobic tank 300 overflows to an aerobic combined MBR membrane tank 400 through an overflow hole, and the membrane tank is fully aerated by a Roots blower 4210, so that DO is kept to be more than or equal to 2mg/L; the device effluent is firstly discharged into the clean water tank 500 through the clean water tank water inlet pipe 503 by the MBR membrane 410 via the suction pump 620, and the volume of the clean water tank 500 meets the water required by one back flushing; after the clean water tank 500 is used for storing water, the conversion electric valve 502 is controlled by the liquid level meter to discharge the equipment effluent to nearby water bodies, the suction pump 620 is linked with the PAC dosing tank 506 and the NaClO dosing tank 507 when the nearby water bodies are discharged, the PAC dosing tank 506 and the NaClO dosing tank 507 are connected with the hose 505, the equipment effluent is subjected to further dephosphorization, sterilization and disinfection in a pipeline through the pipeline mixer 504, and the effluent is stable to reach the first-level A discharge standard. The integrated equipment is set for 10 minutes in a period, wherein the water production time is set for 8 minutes, the dead time is set for 2 minutes, and the backwashing aeration purging is continuously carried out on the surface of the MBR membrane by utilizing the dead time.

Oxygen is provided to the membrane tank through the single Roots blower 4210 by the aeration dry pipe 4202 during normal water production of the aeration device 420, and the air is fully and uniformly distributed in the membrane tank through the microporous aeration disc 4201; during back flushing, the two Roots fans 4210 are simultaneously started, so that the vibration amplitude and vibration frequency of the MBR membrane wires are increased, and the sludge shedding efficiency of the membrane wires is improved.

When the equipment is backwashed, the backwashed is carried out by using the clean water stored in the clean water tank 500 through the backwashed pump 630, the water washing is controlled for 4 times per day, the water washing time is controlled for 2 minutes each time, and the water washing strength is controlled to 20L/m ² H. The dosing back flushing is set in the PLC control system for 4 times per week, the operation time of the dosing pump is 2 minutes, the back flushing water pump is linked with the citric acid dosing tank 508 for pickling, and the concentration of the citric acid is 0.1%. Automatically generating a transmembrane pressure difference curve through a data accumulation PLC, controlling a system to clean online according to the transmembrane pressure difference average data higher than 0.05MPa in 30 continuous days, injecting liquid medicine into the membrane filaments by a backwash pump and a dosing pump, and cleaning the liquid medicine slowlySlowly oozes out from the inside of the membrane silk and is soaked for 4 hours.

The water quality data of rural sewage treatment sites in a certain area after being treated by the integrated sewage treatment device are shown in the following table 1:

table 1 water quality data of rural sewage treatment sites in a certain area after being treated by integrated equipment

Project	COD	NH ₃ -N	TN	pH
					Before treatment	150	30	40	6～9
After treatment	≤40	≤3.0	≤15	6～9

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An integral type MBR membrane biological reaction device, its characterized in that: the anaerobic treatment device comprises a regulating tank (100), an anoxic tank (200), an anaerobic tank (300) and an aerobic combined MBR membrane tank (400), wherein a lifting pump (110) is arranged in the regulating tank (100), and the regulating tank (100) is connected with the anoxic tank (200) through a pipeline by virtue of the lifting pump (110); an upper inlet and lower outlet pipe (220) is arranged above the anoxic tank (200), and the anoxic tank (200) is connected with the anaerobic tank (300) through the upper inlet and lower outlet pipe (220);

an MBR membrane frame (410) is arranged in the aerobic combined MBR membrane tank (400), an aeration device (420) is arranged below the MBR membrane frame (410), the aeration device (420) is connected with an external fan through a pipeline, a suction pipe (430) is arranged at the top of the MBR membrane frame (410), a backwashing pipe (440) is arranged at the bottom of the MBR membrane frame (410), the suction pipe (430) is connected with a suction pump (620) through a pipeline, and the backwashing pipe (440) is connected with the backwashing pump (630) through a pipeline; and a mixed liquid reflux pump (460) is arranged at the bottom of the aerobic combined MBR membrane tank (400), and the aerobic combined MBR membrane tank (400) is connected with the anoxic tank (200) through a reflux pipe (310) by the mixed liquid reflux pump (460).

2. The integrated MBR membrane bioreactor of claim 1, wherein: a floating ball liquid level controller (120) is arranged in the regulating tank (100).

3. The integrated MBR membrane bioreactor of claim 1, wherein: an electromagnetic flowmeter (130) is arranged on a pipeline connected with the lift pump (110) and the anoxic tank (200).

4. The integrated MBR membrane bioreactor of claim 1, wherein: a hydraulic stirrer (210) is arranged in the anoxic tank (200).

5. The integrated MBR membrane bioreactor of claim 1, wherein: an overflow port (450) is arranged at the top of the aerobic combined MBR membrane tank (400), and overflow effluent flows back to the regulating tank (100) through the overflow port (450).

6. The integrated MBR membrane bioreactor of claim 1, wherein: the aeration device (420) comprises a microporous aeration disc (4201) and an aeration main pipe (4202), and the aeration main pipe (4202) is connected with the microporous aeration disc (4201) through a pipeline.

7. An integrated MBR membrane bioreactor apparatus according to any one of claims 1-6, wherein: the device also comprises a clean water tank (500), wherein the clean water tank (500) is connected with the aerobic combined MBR membrane tank (400) through a water collecting pipe (6210).

8. The integrated MBR membrane bioreactor of claim 7, wherein: the device is characterized by further comprising a device room (600), wherein a PAC dosing tank (506) and a NaClO dosing tank (507) are arranged in the device room, the PAC dosing tank (506) and the NaClO dosing tank (507) are connected with the clean water tank (500) through pipelines, and pipeline mixers (504) are arranged on the pipelines, connected with the clean water tank (500), of the PAC dosing tank (506) and the NaClO dosing tank (507).

9. The integrated MBR membrane bioreactor of claim 8, wherein: a citric acid dosing tank (508) is arranged in the equipment room (600), and the citric acid dosing tank (508) is connected with a backwashing pipe (440) through a pipeline.

10. The integrated MBR membrane bioreactor of claim 8, wherein: a residual sludge pump (610) is arranged in the equipment room (600).