CN204281404U - A kind of novel film bioreactor device - Google Patents

Abstract

A kind of film bioreactor device, comprise the raw water box, MBR reaction tank and the filtered water tank that connect in turn, the top fixing horizontal cover net of MBR reaction tank, bottom be provided with can move up and down, horizontal compression net that centre has hyperfiltration membrane assembly pre-opened hole, filled polyurethane sponge filler between two nets, when horizontal compression net receives reaction tank top, filler is received to top simultaneously, avoid back flushing to the destruction of micropopulation in filler; Polyurethane sponge has vesicular structure, for microorganism growth provides carrier, can be suitable for the apposition growth of anaerobism and aerobic microbiological simultaneously, nitration denitrification effect is strengthened, and the clearance of nitrogen improves; The existence of filler effectively can reduce the concentration of active sludge in reaction tank, reduces microorganism concn in mixed solution, delays Pollution of Ultrafiltration Membrane; Main line also establishes two counter-flushing pipelines, realizes back flushing and the same pump of exiting water process, has saved equipment cost, be widely used in the process of municipal effluent and trade effluent, especially the process of high-concentration ammonia nitrogenous wastewater.

Description

A new type of membrane bioreactor device

technical field

The utility model relates to the field of sewage treatment, in particular to a novel membrane bioreactor device.

Background technique

Membrane bioreactor (MBR) is a new type of wastewater treatment system that organically combines membrane separation technology and biological treatment technology. It is a new type of water treatment technology that combines a membrane separation unit with a biological treatment unit. It replaces the secondary settling tank with membrane modules to maintain a high concentration of active sludge in the bioreactor to reduce the footprint of sewage treatment facilities and maintain low pollution Sludge loading reduces sludge volume. Mainly use the membrane separation equipment immersed in the aerobic biological tank to retain the activated sludge and macromolecular solids in the tank. With the continuous improvement of membrane manufacturing technology, MBR processing technology will become more mature.

As an efficient water treatment technology, MBR is in the stage of development and perfection, and it still has certain defects that need to be further resolved. For example, the membrane fouling problem is always a technical problem that is difficult to solve. Although the cross-flow technology in the existing technology can reduce the membrane fouling to a certain extent, the required technical equipment is complicated, the energy consumption is high, and the membrane maintenance process is complicated. High requirements for technical personnel and high construction and operation costs; in addition, long biochemical treatment time, low efficiency and low total nitrogen removal rate are currently the main bottlenecks that limit the application of MBR projects.

Utility model content

The utility model provides a new type of membrane bioreactor device, which is mainly used to solve the serious membrane pollution in the sewage treatment of the existing membrane bioreactor device. Although the cross-flow technology can reduce the membrane pollution to a certain extent, the required Complex technical equipment, high energy consumption, complex membrane maintenance process, high requirements for equipment and technical personnel, and high cost of construction and operation; it also solves the problems of long time, low efficiency and total nitrogen biochemical treatment of sewage in existing membrane bioreactor devices. The technical problem of low removal rate.

In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is:

A new type of membrane bioreactor device, including a raw water tank, an MBR reaction tank, a clean water tank, a water inlet pipe connecting the raw water tank and the MBR reaction tank, a connecting pipe connecting the MBR reaction tank and the clean water tank, and connecting the outlet of the clean water tank The water outlet pipe is provided with a water inlet valve and a water inlet pump on the water inlet pipe. The connecting pipe is provided with a connecting pipe control valve, an outlet water pump and a solenoid valve in sequence from the MBR reaction tank to the clean water tank, and the water outlet pipe is provided with an outlet valve. , the bottom of the MBR reaction tank is provided with a mud discharge pipe and an aeration pipe connected to the blower, and an ultrafiltration membrane module and a reaction tank level gauge are arranged inside the MBR reaction tank, and the sewage enters the MBR reaction tank, where it is Microbial purification treatment, enter the clean water tank after passing through the ultrafiltration membrane module, and then discharge from the clean water tank. It is characterized in that: the top of the MBR reaction tank is fixed with a horizontal cover net, and the bottom is provided with a horizontal compression net that can move up and down. The MBR reaction tank between the horizontal compression net and the horizontal cover net is filled with polyurethane sponge filler, and the middle of the net surface of the horizontal compression net is opened for the ultrafiltration membrane module between the horizontal compression net and the horizontal cover net to pass through. hole.

As a preferred technical solution of the present utility model, the connecting pipe between the connecting pipe control valve and the outlet pump communicates with the clean water tank through the backwash pipeline one, and the connecting pipe between the MBR reaction tank and the connecting pipe control valve passes through the backwashing pipe. The second pipeline communicates with the connecting pipe between the connecting pipe control valve and the electromagnetic valve. The first backwashing pipeline is provided with a backwashing control water inlet valve, and the backwashing pipeline 2 is provided with a backwashing control water outlet valve.

As a further preferred technical solution of the present invention, the polyurethane sponge filler has a particle size ranging from 0.5 to 1.5 cm, and can be in the shape of a sphere, a cube or an irregular shape.

Further preferably, the horizontal compression net and the horizontal cover net are steel wire nets with a hole diameter of 1-5 mm.

Further preferably, a raw water tank liquid level gauge is provided in the raw water tank, and the raw water tank liquid level gauge is set at the bottom of the raw water tank, higher than the water inlet pipe.

Further preferably, the liquid level gauge of the reaction tank includes an outlet water level gauge, a water inlet high water level gauge and an inlet water low water level gauge whose heights are successively reduced. When the water level in the MBR reaction tank is lower than the low water level gauge, The water inlet pump starts to feed water, and when the water level reaches the high water level, the water inlet pump stops feeding water; intermittent water discharge, the duration and interval of water discharge are controlled by the circuit, and can be manually set on the control system.

Further preferably, the ultrafiltration membrane module is a PVDF hollow fiber membrane submerged in the liquid in the MBR reaction tank.

Compared with the prior art, the technical advantages of the utility model are:

1. Save equipment and reduce costs

There are two branch pipelines on the main road, backwashing pipeline 1 and backwashing pipeline 2. When draining, the connecting pipe control valve and the water outlet valve are opened, and the backwashing control water inlet valve and the backwashing control water outlet valve are closed at the same time. When backwashing, The connecting pipe control valve and the water outlet valve are closed, the backwash control water inlet valve and the backwash control water outlet valve are opened, the outlet pump is manually started, and the water in the clean water tank passes through the clean water tank, backwash pipeline 1, outlet pump, and backwash in sequence The second pipeline enters the MBR reaction tank for backwashing, and the same pump is used for backwashing and water outlet process, which saves equipment and reduces costs;

2. Effectively retain microorganisms

The top of the MBR reaction tank is fixed with a horizontal cover net, and the bottom is equipped with a horizontal compression net that can move up and down and has holes reserved for ultrafiltration membrane modules in the middle. The polyurethane sponge filler is filled between the two nets. When the horizontal compression net is received at the top of the reaction pool, it will The packing is collected to the top at the same time, avoiding the damage to the microorganisms in the packing by backwashing, especially the poisoning of the microorganisms in the packing during chemical backwashing;

3. Improve the removal rate of total nitrogen

Add polyurethane sponge filler to the sludge mixture. The polyurethane sponge has a porous structure and can provide a carrier for the growth of microorganisms. A microbial film can be formed on the surface of the filler and in the micropores of the filler. Denitrifying bacteria grow in the oxygen environment, while nitrifying bacteria grow in the aerobic environment outside the biofilm, thus forming an environment where nitrification-denitrification reactions coexist, which can be suitable for the attachment and growth of anaerobic and aerobic microorganisms at the same time, so that The nitrification and denitrification effect is strengthened, and the removal efficiency of nitrogen is improved; at the same time, the presence of filler can effectively reduce the concentration of activated sludge in the reaction tank, so that the amount of sludge discharged from the membrane bioreactor is small, and the longer sludge age is conducive to nitrifying bacteria. and the growth of denitrifying bacteria, so this new membrane bioreactor helps to improve the removal efficiency of total nitrogen;

4. Reduce membrane fouling

The application of polyurethane sponge filler can effectively reduce the concentration of activated sludge in the reaction tank, reduce the concentration of microorganisms in the mixed solution, and delay the fouling of the ultrafiltration membrane.

The utility model can be widely used in the treatment of urban sewage and some industrial wastewater, especially the treatment of high-concentration ammonia nitrogen wastewater.

Description of drawings

Fig. 1 is the water treatment flowchart of the membrane bioreactor device that the utility model relates to;

Fig. 2 is the structural representation of the MBR reaction pool 4 that the utility model relates to;

Fig. 3 is a schematic structural view of the horizontal compression network 6 involved in the utility model;

Fig. 4 is a schematic structural view of the horizontal cover net 7 involved in the present invention.

Reference signs: 1-raw water tank, 2-water inlet pipe, 3-water inlet pump, 4-MBR reaction tank, 5-polyurethane sponge packing, 6-horizontal compression net, 7-horizontal cover net, 8-bottom tank, 9- Aeration pipe, 10-ultrafiltration membrane module, 11-liquid level gauge, 11.1-low water level gauge, 11.2-high water level gauge, 11.3-outlet level gauge, 12-blower, 13-outlet pump, 14 -Solenoid valve, 15-gas flow meter, 16-water outlet flow meter, 17-backwash pipeline 1, 18-backwash pipeline 2, 19-water outlet pipe, 20-clean water tank, 21-silt discharge pipe, 22.1- Water inlet valve, 22.2-pressure gauge control valve, 22.3-connecting pipe control valve, 22.4-backwash control water inlet valve, 22.5-backwash control water outlet valve, 22.6-water outlet valve, 22.7-mud discharge pipe control valve, 23- Pressure gauge, 24-raw water tank liquid level gauge, 25-reserved hole, 26-connecting pipe.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described. As shown in Figure 1, comprise raw water tank 1, MBR reaction tank 4, clear water tank 20, the water inlet pipe 2 that communicates with raw water tank 1 and MBR reaction tank 4, the connecting pipe 26 that communicates with MBR reaction tank 4 and clear water tank 20, and Connected to the water outlet pipe 19 at the outlet of the clean water tank 20, the water inlet pipe 2 is provided with a water inlet valve 22.1 and a water inlet pump 3, and the connection pipe 26 is provided with a pressure gauge 23, a connection Pipe control valve 22.3, outlet pump 13 and solenoid valve 14, outlet pipe 19 is provided with outlet valve 22.6, pressure gauge 23 is controlled by pressure gauge control valve 22.2, and the bottom of described MBR reaction tank 4 is provided with mud discharge pipe 21 and with The aeration pipe 9 connected to the blower 12 and the sludge discharge pipe 21 are arranged at the bottom of the MBR reaction tank 4, which can regularly discharge part of the activated sludge and control the sludge age. The sludge discharge pipe 21 is provided with a sludge discharge pipe control valve 22.7; Described aeration pipe 9 is placed in the bottom tank 8 of MBR reaction tank 4, to prevent the sludge layer of formation; The filter membrane assembly 10 is a PVDF hollow fiber membrane submerged in the liquid in the MBR reaction tank 4; an outlet flow meter 16 is arranged between the outlet pump 13 and the clean water tank 20; A gas flow meter 15 is provided.

The top of the MBR reaction tank 4 is fixed with a horizontal cover net 7, and the bottom is provided with a horizontal compression net 6 that can move up and down. The reserved hole 25 that the ultrafiltration membrane assembly 10 passes between the cover net 7; the mesh surfaces of the horizontal compression net 6 and the horizontal cover net 7 are all horizontal directions; the horizontal compression net 6 and the horizontal cover net 7 The other spaces between are filled with polyurethane sponge filler 5. The polyurethane sponge filler 5 has a particle size ranging from 0.5 to 1.5 cm, and can be in the form of spheres, cubes or other irregular shapes. Both the horizontal compression net 6 and the horizontal cover net 7 are steel wire nets with a hole diameter of 1-5 mm.

The connecting pipe 26 between the connecting pipe control valve 22.3 and the outlet pump 13 communicates with the clean water tank 20 through the backwash pipeline 17, and the connecting pipe 26 between the MBR reaction tank 4 and the connecting pipe control valve 22.3 passes through the backwashing pipe Road two 18 communicates with the connecting pipe 26 between the connecting pipe control valve 22.3 and the solenoid valve 14. The backwashing pipeline one 17 is provided with a backwashing control water inlet valve 22.4, and the backwashing pipeline two 18 is provided with a backwashing pipeline. Flushing control water outlet valve 22.5. The backwash pipeline includes clean water tank 20, backwash pipeline one 17, outlet pump 13, backwash pipeline two 18 and MBR reaction tank 4 connected in sequence. During backwash, the water in the clean water tank passes through the clean water tank in sequence 20. Backwash pipeline 1 17, outlet pump 13, and backwash pipeline 2 18 enter the MBR reaction tank 4 for backwashing.

The raw water tank 1 is provided with a raw water tank liquid level gauge 24, and the raw water tank liquid level gauge 24 is arranged on the bottom of the raw water tank 1, slightly higher than the water inlet pipe 2, when the water level in the raw water tank 1 is lower than the raw water tank liquid level At 24 o'clock, the water inlet pump 3 stops working; the reaction tank level gauge 11 includes a water outlet level gauge 11.3 whose height gradually decreases, an inlet high water level gauge 11.2 and an inlet low water level gauge 11.1, when the MBR reaction tank 4 When the internal water level is lower than the inlet low water level gauge 11.1, the inlet pump 3 is turned on, and the sewage in the raw water tank 1 enters the MBR reaction tank 4; when the water level in the MBR reaction tank 4 reaches the inlet high water level gauge 11.2, the inlet pump The water pump 3 is closed to stop the water intake; when the water level in the MBR reaction tank 4 is lower than the water outlet level gauge 11.3, the water outlet pump 13 is closed to stop the water outlet.

The aeration rate of the equipment is controlled by blower 12 and gas flowmeter 15, and the outlet water flow is regulated by outlet pump 13 and outlet water flowmeter 16. The outlet time and intermittent time can be set on the control system.

Below in conjunction with accompanying drawing respectively with regard to the use state of the utility model equipment in sewage treatment process and backwashing process, describe in detail:

1. Sewage treatment process: When the sewage treatment equipment is in automatic operation state, open the pressure gauge control valve 22.2, the connecting pipe control valve 22.3 and the water outlet valve 22.6, and close the backwash control water inlet valve 22.4 and the backwash control water outlet valve 22.5 at the same time, the sewage from The raw water tank 1 is pumped into the MBR reaction pool 4, and purified by microorganisms distributed in the polyurethane sponge filler 5 and the mixed solution. The purified water passes through the ultrafiltration membrane module 10 and then pumped out. Under the combined effect of filtration, the sewage treatment efficiency is high and the treatment time is short. See Figure 2. During this process, the polyurethane sponge filler 5 is evenly suspended in the entire MBR reaction tank 4. Some microorganisms are suspended in the reactor, and some are in the polyurethane sponge filler. 5. If the microbial film is formed on the surface or adsorbed in the micropores of the filler, the diversified existence of microorganisms helps to improve the sewage treatment effect; most of the microorganisms are adsorbed on the surface of the filler or in the micropores, and the number of microorganisms suspended in the water is reduced, which is beneficial Membrane fouling is slowed down; there is anaerobic space inside the micropores of the filler, which is conducive to the large-scale reproduction of anaerobic microorganisms and makes the removal rate of total nitrogen high. The aeration tube is placed in the bottom tank. Under the action of aeration, the concentration of activated sludge in the entire reaction tank is uniform, there is no sludge sedimentation area or aeration dead angle, and the reaction system has high sewage treatment efficiency.

2. Backwashing operation: when the reading of the pressure gauge 23 reaches 0.04-0.05MPa, it is necessary to backwash the ultrafiltration membrane module 10 . When backwashing, stop the automatic operation program, add the backwashing water or the backwashing water with chemical reagents into the clean water tank 20, close the connecting pipe control valve 22.3, the water outlet valve 22.6, open the backwashing control water inlet valve 22.4 and Backwash control outlet valve 22.5, manual start water outlet pump 13, at this time the water in clean water tank 20 enters MBR reaction pool 4 through backwash control inlet valve 22.4, outlet pump 13, outlet water flow meter 16, backwash control outlet valve 22.5 Inside, the backwashing of the ultrafiltration membrane module 10 is realized.

Claims (7)

1. a novel film bioreactor device, include raw water box (1), MBR reaction tank (4), filtered water tank (20), be communicated with the water inlet pipe (2) of raw water box (1) and MBR reaction tank (4), be communicated with the pipe connecting (26) of MBR reaction tank (4) and filtered water tank (20), and be connected to the rising pipe (19) that filtered water tank (20) exports, described water inlet pipe (2) is provided with inlet valve (22.1) and intake pump (3), pipe connecting (26) is sequentially with pipe connecting by-pass valve control (22.3) by MBR reaction tank (4) to filtered water tank (20) direction, go out water pump (13) and magnetic valve (14), rising pipe (19) is provided with flowing water Valve (22.6), the bottom of described MBR reaction tank (4) be provided with shore pipe (21) and and the aeration tube (9) that is connected with gas blower (12), MBR reaction tank (4) inside is provided with hyperfiltration membrane assembly (10) and reaction tank liquidometer (11), it is characterized in that:

The top of described MBR reaction tank (4) is fixed with a horizontal cover net (7), bottom is provided with a horizontal compression net (6) moving up and down, filled polyurethane sponge filler (5) in MBR reaction tank (4) between horizontal compression net (6) and horizontal cover net (7), has the pre-opened hole (25) for being located at the hyperfiltration membrane assembly (10) between horizontal compression net (6) and horizontal cover net (7) and passing in the middle of the wire side of horizontal compression net (6).

2. novel film bioreactor device according to claim 1, it is characterized in that: described pipe connecting by-pass valve control (22.3) is communicated with filtered water tank (20) by counter-flushing pipeline one (17) with the pipe connecting (26) gone out between water pump (13), pipe connecting (26) between MBR reaction tank (4) with pipe connecting by-pass valve control (22.3) is communicated with the pipe connecting (26) between water flow meter (16) and magnetic valve (14) by counter-flushing pipeline two (18), described counter-flushing pipeline one (17) is provided with back flushing and controls inlet valve (22.4), counter-flushing pipeline two (18) is provided with back flushing and controls flowing water Valve (22.5).

3. novel film bioreactor device according to claim 1, is characterized in that: the particle size range of described polyurethane sponge filler (5) is 0.5 ~ 1.5cm, is spheroid, cubes or anomalistic object.

4. novel film bioreactor device according to claim 1, is characterized in that: the woven wire of described horizontal compression net (6) and horizontal cover net (7) to be aperture be 1 ~ 5mm.

5. novel film bioreactor device according to claim 1, is characterized in that: be provided with raw water box liquidometer (24) in described raw water box (1), and described raw water box liquidometer (24) is arranged at the bottom of raw water box (1), higher than water inlet pipe (2).

6. novel film bioreactor device according to claim 1, is characterized in that: described reaction tank liquidometer (11) comprises the water outlet liquidometer (11.3), high-water liquidometer (11.2) and the low-water level liquidometer (11.1) that reduce highly gradually.

7. novel film bioreactor device according to claim 1, is characterized in that: described hyperfiltration membrane assembly (10) is immersed in the PVDF hollow-fibre membrane in MBR reaction tank (4) interior liquid.