CN216005352U

CN216005352U - Energy-conserving MBR sewage treatment system

Info

Publication number: CN216005352U
Application number: CN202121740228.6U
Authority: CN
Inventors: 邱敬贤; 潘智民; 曾木平; 孙慧智; 吴卫; 何曦
Original assignee: Changsha Industrial Research Institute Environmental Protection Co Ltd
Current assignee: Changsha Industrial Research Institute Environmental Protection Co Ltd
Priority date: 2021-07-29
Filing date: 2021-07-29
Publication date: 2022-03-11
Anticipated expiration: 2031-07-29

Abstract

The utility model discloses an energy-saving MBR sewage treatment system, which comprises an adjusting tank, an anoxic tank, an anaerobic tank, an aerobic tank, an MBR membrane tank, a clean water tank, a gas stripping pipe and a mixed liquid return pipe, wherein the top of the aerobic tank is provided with a three-phase separator and a gas collecting device, the gas outlet end of the three-phase separator is connected with the gas collecting device, the gas collecting device is communicated with the gas stripping pipe, and the gas stripping pipe is communicated with the mixed liquid return pipe; the MBR membrane tank is arranged at the bottom of the aerobic tank. The MBR sewage treatment system has the advantages of low operation energy consumption, simple structure, convenience in operation and the like.

Description

Energy-conserving MBR sewage treatment system

Technical Field

The utility model relates to the technical field of sewage treatment, in particular to an energy-saving MBR sewage treatment system.

Background

The application of the MBR membrane technology brings great development to the field of sewage treatment, has the advantages of stable effluent quality, small occupied area, no need of a secondary sedimentation tank, simple and convenient operation and the like, brings great environmental and economic benefits to human beings, and particularly has wide application prospect along with gradual maturity of the membrane technology and upgrading and transformation of treatment plants in recent years.

However, the high energy consumption of MBR membrane technology limits its wide application. Specifically, the sludge concentration in the MBR membrane tank is very high, the aeration intensity must be increased to maintain a sufficient oxygen transfer rate, and simultaneously, in order to increase the membrane flux and reduce membrane pollution, the flow rate must be increased to wash out the membrane surface, so that the aeration rate of the membrane tank is large, the aeration energy consumption is very high, and simultaneously, the energy consumption is also required for the reflux of the sludge and the nitrifying liquid, so the energy-saving key is to reduce the aeration energy consumption, the reflux energy consumption and the backwashing energy consumption. Therefore, an energy-saving MBR sewage treatment mode needs to be found.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims to overcome the defect of high operation energy consumption of the MBR sewage treatment system in the prior art, and provides an energy-saving MBR sewage treatment system so as to reduce the operation energy consumption.

The utility model solves the problems through the following technical means: an energy-saving MBR sewage treatment system comprises an adjusting tank, an anoxic tank, an anaerobic tank, an aerobic tank, an MBR membrane tank, a clean water tank, a gas stripping pipe and a mixed liquid return pipe, wherein a three-phase separator and a gas collecting device are arranged at the top of the aerobic tank; the MBR membrane tank is arranged at the bottom of the aerobic tank.

Further, MBBR fillers are filled in the aerobic tank and the MBR membrane tank.

Further, be provided with the MBR membrane module in the MBR membrane cisterna, the MBR membrane module passes through outlet pipe and clean water basin intercommunication, be provided with self priming pump and product water valve on the outlet pipe.

Further, still include backwash pipe, sour charge device and alkali charge device, the backwash pipe is parallelly connected with the play water pipe section of installing self priming pump and producing the water valve and is arranged, is provided with backwash valve and backwash pump on the backwash pipe, sour charge device includes sour dosing tank, sour dosing pipe and sour dosing pump, sour dosing tank passes through sour dosing pipe and backwash pipe intercommunication, sour dosing pump sets up on sour dosing pipe, alkali charge device includes alkali dosing tank, alkali dosing pipe and alkali dosing pump, alkali dosing tank passes through alkali dosing pipe and backwash pipe intercommunication, alkali dosing pump sets up on alkali dosing pipe.

Further, a lift pump is arranged in the adjusting tank, a main water inlet pipe is arranged at the water outlet end of the lift pump, the main water inlet pipe is communicated with the anoxic tank and the anaerobic tank through an anoxic tank water inlet branch pipe and an anaerobic tank water inlet branch pipe respectively, a water inlet main valve is arranged on the main water inlet pipe, and an anoxic water inlet valve and an anaerobic water inlet valve are arranged on the anoxic tank water inlet branch pipe and the anaerobic tank water inlet branch pipe respectively.

Further, the anoxic tank is communicated with the anaerobic tank at the bottom, and the anaerobic tank is communicated with the aerobic tank at the top.

Further, be provided with first aeration equipment and second aeration equipment in oxygen deficiency pond and the MBR membrane cisterna respectively, first aeration equipment and second aeration equipment communicate with the fan through first aeration pipe and second aeration pipe respectively, all be provided with aeration control valve on first aeration pipe and the second aeration pipe.

Further, the liquid inlet end of the mixed liquid return pipe is communicated with the MBR membrane tank, the liquid outlet end of the mixed liquid return pipe is communicated with the anoxic tank, and a return valve is arranged on the mixed liquid return pipe.

Further, a first interception net is arranged at the communication position of the anaerobic tank and the aerobic tank; and the liquid inlet end of the mixed liquid return pipe is provided with a second interception net.

Further, oxygen deficiency pond, anaerobism pond, good oxygen pond, MBR membrane cisterna and clean water basin are integrated together and constitute sewage treatment reactor main part, sewage treatment reactor main part is the concentric circle structure of two rings inside and outside, oxygen deficiency pond, anaerobism pond and clean water basin are arranged in the outer lane, separate through the baffle between oxygen deficiency pond, anaerobism pond and the clean water basin, good oxygen pond and MBR membrane cisterna are arranged at the inner circle and are arranged from top to bottom.

The utility model has the beneficial effects that: the energy-saving MBR sewage treatment system comprises an adjusting tank, an anoxic tank, an anaerobic tank, an aerobic tank, an MBR membrane tank, a clean water tank, a gas stripping pipe and a mixed liquid return pipe, wherein a three-phase separator and a gas collecting device are arranged at the top of the aerobic tank; the MBR membrane tank is arranged at the bottom of the aerobic tank. This MBR sewage treatment system adopts the MBR membrane cisterna to set up the design in good oxygen pond below, utilizes the surplus air of MBR membrane cisterna aeration to carry out the aeration to good oxygen pond, practices thrift the aeration energy consumption, sets up three-phase separator and gas collection device on good oxygen pond upper portion simultaneously and collects gas for the air stripping of mixed liquid flows back, need not backwash pump and extra power. In addition, MBBR fillers are added into the aerobic tank and the MBR membrane tank, and move freely under the aeration condition, so that a certain scrubbing effect on pollutants attached to the surface of the MBR membrane is achieved, the pollution and backwashing frequency of the MBR membrane are reduced, and the backwashing energy consumption is further reduced. In a word, the MBR sewage treatment system has the advantages of low operation energy consumption, simple structure, convenience in operation and the like.

Drawings

The utility model is further described below with reference to the figures and examples.

FIG. 1 is a schematic structural diagram of an energy-saving MBR sewage treatment system of the present invention.

Fig. 2 is a concentric circle structure view of an energy-saving MBR sewage treatment system of the present invention.

In the figure: 1. a grid; 2. a regulating tank; 3. a lift pump; 4. a main water inlet valve; 5. an anoxic water inlet valve; 6. an anaerobic water inlet valve; 7. a reflux valve; 8. a first interception net; 9. a three-phase separator; 10. a gas collection device; 11. MBBR filler; 12. an anoxic tank; 13. a first aeration device; 14. an anaerobic tank; 15. an MBR membrane tank; 16. a fan; 17. a sludge discharge pipe; 18. a second aeration device; 19. an MBR membrane module; 20. a second interception net; 21. an aerobic tank; 22. a clean water tank; 23. a self-priming pump; 24. a backwash valve; 25. a backwash pump; 26. a water production valve; 27. an acid dosing pump; 28. an acid dosing tank; 29. an alkali dosing pump; 30. an alkali dosing tank; 31. a gas stripping tube; 32. a mixed liquid return pipe; 33. an aeration control valve.

Detailed Description

The utility model is explained in more detail below with reference to the figures and examples. The features and advantages of the present invention will become more apparent from the description. It is to be understood that the described embodiments are merely a few embodiments of the utility model, and not all embodiments.

As shown in fig. 1, the energy-saving MBR sewage treatment system of the present embodiment includes an adjusting tank 2, an anoxic tank 12, an anaerobic tank 14, an aerobic tank 21, an MBR membrane tank 15, a clean water tank 22, an air stripping pipe 31, and a mixed liquid return pipe 32, and the anoxic tank, the anaerobic tank, the aerobic tank, the MBR membrane tank, and the clean water tank are integrated together to form a sewage treatment reactor main body. The water inlet of the adjusting tank is provided with a grid 1, the adjusting tank is internally provided with a lift pump 3, the water outlet end of the lift pump is provided with a main water inlet pipe, the main water inlet pipe is communicated with the anoxic tank and the anaerobic tank through an anoxic tank water inlet branch pipe and an anaerobic tank water inlet branch pipe respectively, the main water inlet pipe is provided with a water inlet main valve 4, and the anoxic tank water inlet branch pipe and the anaerobic tank water inlet branch pipe are respectively provided with an anoxic water inlet valve 5 and an anaerobic water inlet valve 6. The anaerobic tank is communicated with the anaerobic tank through a water hole at the bottom, the anaerobic tank is communicated with the aerobic tank through an overflow port at the top, and a first interception net 8 is arranged at the overflow port. The MBR membrane tank is provided with an MBR membrane module 19 at the bottom of the aerobic tank, the bottom of the MBR membrane tank is provided with a sludge discharge pipe 17, the MBR membrane module is communicated with a clean water tank through a water outlet pipe, and a self-priming pump 23 and a water production valve 26 are arranged on the water outlet pipe. For the compactness that improves the structure, as shown in fig. 2, sewage treatment reactor main part is the concentric circle structure of inside and outside two rings, oxygen deficiency pond, anaerobism pond and clean water basin are arranged in the outer lane, separate through the baffle between oxygen deficiency pond, anaerobism pond and the clean water basin, good oxygen pond and MBR membrane cisterna are arranged at the inner circle and are arranged from top to bottom.

The liquid inlet end of the mixed liquid return pipe is communicated with the MBR membrane tank, the liquid outlet end of the mixed liquid return pipe is communicated with the anoxic tank, the liquid inlet end of the mixed liquid return pipe is provided with a second interception net 20, and the mixed liquid return pipe is provided with a return valve 7; the gas stripping pipe is communicated with the mixed liquid return pipe.

The top of the aerobic tank is provided with a three-phase separator 9 and a gas collecting device 10, the gas outlet end of the three-phase separator is connected with the gas collecting device, and the gas collecting device is communicated with a gas stripping pipe.

The anaerobic tank and the MBR membrane tank are respectively internally provided with a first aeration device 13 and a second aeration device 18, the first aeration device and the second aeration device are respectively communicated with a fan 16 through a first aeration pipe and a second aeration pipe, and the first aeration pipe and the second aeration pipe are respectively provided with an aeration control valve 33.

The acid dosing device comprises an acid dosing tank 28, an acid dosing pipe and an acid dosing pump 27, the acid dosing tank is communicated with the backwashing pipe through the acid dosing pipe, the acid dosing pump is arranged on the acid dosing pipe, the alkali dosing device comprises an alkali dosing tank 30, an alkali dosing pipe and an alkali dosing pump 29, the alkali dosing tank is communicated with the backwashing pipe through the alkali dosing pipe, and the alkali dosing pump is arranged on the alkali dosing pipe.

In the specific application process, the equipment rooms for placing the self-sucking pump 23, the backwashing pump 25, the fan 16, the acid dosing device, the alkali dosing device and the like can be independently arranged.

The concrete during operation: the wastewater firstly intercepts floating objects through a grating 1 and then enters an adjusting tank 2, then enters a reactor main body through a lift pump 3 along a main water inlet pipe and a main water inlet valve 4 and then respectively enters an anoxic tank 12 and an anaerobic tank 14 through an anoxic water inlet valve 5 and an anaerobic water inlet valve 6, wherein the water inlet ratio is that of the anoxic tank: the anaerobic pool is 7: 3; the anoxic tank 12 and the anaerobic tank 14 are separated by a partition plate, the bottoms of the anoxic tank 12 and the anaerobic tank 14 are communicated, wastewater enters the anaerobic tank 14 from the anoxic tank 12, meanwhile, a first aeration device 13 is arranged at the bottom of the anoxic tank 12, aeration is performed by periodically opening the first aeration device, and the first aeration device is controlled by an aeration control valve 33 on a first aeration pipe to start and stop the first aeration device. The water in the anoxic tank 12 is mixed with the mixed liquid flowing back from the mixed liquid return pipe 32 arranged in the MBR membrane tank 15, so that the denitrification of the anoxic tank 12 preferentially obtains a carbon source, and the denitrification effect of the equipment is improved. The mixed liquid is refluxed by gas stripping, the power required by the reflux is provided by the gas collected by the gas collecting device 10 after the gas-liquid separation is carried out by the three-phase separator 9 arranged at the upper end of the aerobic tank 21, a reflux pump and additional power are not needed, and the energy consumption is saved. The modular design of the three-phase separator is convenient for installation and lifting out, and is also beneficial to the lifting out off-line cleaning of the MBR membrane module. The gas collecting apparatus 10 is connected to a stripping pipe 31, and the reflux ratio of the reflux liquid is controlled by a reflux valve 7 provided in a mixed liquid reflux pipe 32.

MBBR fillers are added into the aerobic tank 21 and the MBR membrane tank 15, the effluent of the anaerobic tank 14 enters the aerobic tank 21 through an overflow port and a first interception net 8, and the interception net plays a role in intercepting the MBBR fillers to prevent the MBBR fillers from escaping. The wastewater is biochemically treated under the action of aeration and MBBR filling 11 to remove pollutants, the aeration of the aerobic tank 21 is provided by the residual air after the aeration of the second aeration device 18 in the MBR membrane tank 15, no additional aeration device or power is needed, and the energy consumption is saved. Meanwhile, the biomembrane on the surface of the filler can cause solution concentration difference according to the adjustment of aeration air quantity, so that the synchronous nitrification and denitrification are promoted. In addition, the MBBR filler 11 can freely move under aeration to scrub the MBR membrane, so that the pollution of the MBR membrane is reduced, the backwashing frequency is reduced, and the energy consumption is saved. The filling rate of MBBR fillers in the aerobic tank 21 and the MBR membrane tank 15 is 30%, the diameter of the fillers is 20mm, the size of the fillers is larger than the aperture of the first interception net and the aperture of the second interception net 20, the blockage is prevented, and the fillers are made of PE materials. The small holes are uniformly distributed on the surfaces of the two intercepting nets, the aperture of each small hole is smaller than the size of the filler, so that the intercepting nets are prevented from being blocked by the filler, meanwhile, when the second intercepting net 20 is accidentally blocked by the filler, the backflow valve 7 is closed, and the gas collected by the gas collecting device 10 is used for cleaning the second intercepting net 20, so that the blocked filler falls off. An MBR membrane module 19 is arranged in the MBR membrane tank 15 and is divided into water production and backwashing, and the MBR membrane module alternately and intermittently operates. When water is produced, the self-priming pump 23 and the water production valve 26 are opened, the backwashing pump 25 and the backwashing valve 24 are closed, and the produced water enters the clean water tank 22 through the water outlet pipe; during backwashing, the backwashing pump 25 and the backwashing valve 24 are opened, the self-priming pump 23 and the water production valve 26 are closed, and water enters the MBR membrane module from the clean water tank 22 for backwashing. The self-priming pump is used with the water production valve in a matching way, and the backwashing pump is used with the backwashing valve in a matching way, and the self-priming pump and the backwashing valve do not operate simultaneously. Meanwhile, citric acid or sodium hypochlorite is added by an acid dosing device or an alkali dosing device respectively during chemical backwashing. In addition, a chemical phosphorus removal dosing device is configured according to requirements, and the dosing pump automatically adds the chemicals into the aerobic tank to remove the phosphorus, so that the phosphorus is ensured to reach the standard and be discharged according to the discharge.

In conclusion, the energy-saving MBR sewage treatment system of the embodiment adopts the design that the MBR membrane tank is arranged below the aerobic tank, utilizes the residual air of the aeration of the MBR membrane tank to aerate the aerobic tank, saves the aeration energy consumption, and simultaneously sets the three-phase separator and the gas collecting device at the upper part of the aerobic tank to collect the gas for the gas stripping reflux of the mixed liquid without a reflux pump and additional power. In addition, MBBR fillers are added into the aerobic tank and the MBR membrane tank, and move freely under the aeration condition, so that a certain scrubbing effect on pollutants attached to the surface of the MBR membrane is achieved, the pollution and backwashing frequency of the MBR membrane are reduced, and the backwashing energy consumption is further reduced. In a word, the MBR sewage treatment system has the advantages of low operation energy consumption, simple structure, convenience in operation and the like.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims

1. The utility model provides an energy-conserving MBR sewage treatment system which characterized in that: the device comprises a regulating tank, an anoxic tank, an anaerobic tank, an aerobic tank, an MBR membrane tank, a clean water tank, a gas stripping pipe and a mixed liquid return pipe, wherein a three-phase separator and a gas collecting device are arranged at the top of the aerobic tank, the gas outlet end of the three-phase separator is connected with the gas collecting device, the gas collecting device is communicated with the gas stripping pipe, and the gas stripping pipe is communicated with the mixed liquid return pipe; the MBR membrane tank is arranged at the bottom of the aerobic tank.

2. The energy-efficient MBR sewage treatment system of claim 1, wherein: and MBBR fillers are filled in the aerobic tank and the MBR membrane tank.

3. The energy efficient MBR wastewater treatment system of claim 2, wherein: the MBR membrane tank is internally provided with an MBR membrane module, the MBR membrane module is communicated with the clean water tank through a water outlet pipe, and the water outlet pipe is provided with a self-priming pump and a water production valve.

4. The energy efficient MBR sewage treatment system of claim 3, wherein: the acid dosing device comprises an acid dosing tank, an acid dosing pipe and an acid dosing pump, the acid dosing tank is communicated with the backwashing pipe through the acid dosing pipe, the acid dosing pump is arranged on the acid dosing pipe, the alkali dosing device comprises an alkali dosing tank, an alkali dosing pipe and an alkali dosing pump, the alkali dosing tank is communicated with the backwashing pipe through the alkali dosing pipe, and the alkali dosing pump is arranged on the alkali dosing pipe.

5. The energy-efficient MBR sewage treatment system of claim 4, wherein: the anaerobic sewage treatment device is characterized in that a lifting pump is arranged in the regulating tank, a main water inlet pipe is arranged at the water outlet end of the lifting pump, the main water inlet pipe is communicated with the anaerobic tank and the anoxic tank through an anoxic tank water inlet branch pipe and an anaerobic tank water inlet branch pipe respectively, a water inlet main valve is arranged on the main water inlet pipe, and an anoxic water inlet valve and an anaerobic water inlet valve are arranged on the anoxic tank water inlet branch pipe and the anaerobic tank water inlet branch pipe respectively.

6. The energy efficient MBR sewage treatment system of claim 5, wherein: the anaerobic tank is communicated with the anaerobic tank at the bottom, and the anaerobic tank is communicated with the aerobic tank at the top.

7. The energy-efficient MBR sewage treatment system of claim 6, wherein: the membrane bioreactor is characterized in that a first aeration device and a second aeration device are respectively arranged in the anoxic tank and the MBR membrane tank, the first aeration device and the second aeration device are respectively communicated with a fan through a first aeration pipe and a second aeration pipe, and aeration control valves are respectively arranged on the first aeration pipe and the second aeration pipe.

8. The energy efficient MBR sewage treatment system of claim 7, wherein: the liquid inlet end of the mixed liquid return pipe is communicated with the MBR membrane tank, the liquid outlet end of the mixed liquid return pipe is communicated with the anoxic tank, and a return valve is arranged on the mixed liquid return pipe.

9. The energy efficient MBR wastewater treatment system of claim 8, wherein: a first interception net is arranged at the communication position of the anaerobic tank and the aerobic tank; and the liquid inlet end of the mixed liquid return pipe is provided with a second interception net.

10. The energy efficient MBR sewage treatment system of claim 9, wherein: the utility model discloses a sewage treatment reactor, including oxygen deficiency pond, anaerobism pond, good oxygen pond, MBR membrane cisterna and clean water basin, sewage treatment reactor main part is the concentric circle structure of two rings inside and outside the sewage treatment reactor main part is in the same place and constitutes sewage treatment reactor main part, oxygen deficiency pond, anaerobism pond and clean water basin are arranged in the outer lane, separate through the baffle between oxygen deficiency pond, anaerobism pond and the clean water basin, good oxygen pond and MBR membrane cisterna are arranged at the inner circle and are arranged from top to bottom.