CN205387523U - Low energy consumption composite membrane bioreactor - Google Patents

Abstract

The utility model relates to a composite membrane bioreactor with low energy consumption. The low energy consumption composite membrane bioreactor comprises: a bioreactor main body, a membrane unit and an aeration pipe, wherein the membrane unit is located below the inside of the bioreactor main body, and the biological The interior of the reactor main body is divided into two symmetrical areas, and the membrane stacks are respectively located in the two symmetrical areas; the aeration tubes are respectively arranged in the two symmetrical areas, and the aeration tubes are respectively connected with the Electric valves are connected, and the electric valves respectively control the circulation of the aeration pipes to perform aeration alternately; and the main body of the bioreactor is also provided with carrier fillers.

Description

Low energy consumption composite membrane bioreactor

technical field

The utility model relates to a biological sewage reactor, in particular to a low energy consumption composite membrane bioreactor.

Background technique

At present, with the development of my country's rural economy and the improvement of rural living standards, rural decentralized water pollution is also increasing. Distributed water source pollution treatment in rural areas is different from centralized treatment in cities and small and medium-sized towns. It is difficult to collect sewage in a decentralized manner, lacks municipal sewage collection pipe network and effective management, and is small in volume and wide in scope and decentralized. Developed countries such as Europe, the United States and Japan started research on decentralized domestic sewage treatment early, while domestic research started late and the technology is single, mainly using aerobic, anaerobic or a combination of anaerobic and aerobic processes, which have poor applicability, accounting for It has disadvantages such as large area, poor nitrogen and phosphorus removal effect, and complicated operation and management.

Membrane bioreactor is an efficient wastewater treatment technology that combines biological treatment and membrane separation. It has the advantages of high treatment efficiency, effluent can be directly reused; stable system operation, simple process, less equipment, small footprint; long sludge age, less residual sludge; convenient operation and management, easy to realize automatic control and so on. The domestic sewage treated by the membrane bioreactor can meet the discharge standard and be discharged directly.

In addition, domestic and foreign studies have found that total nitrogen (TN) can be removed by simultaneous nitrification and denitrification or short-cut nitrification and denitrification in the same reactor. Applying this technology to the membrane bioreactor, by adding a certain amount of carrier filler, not only can change the properties of the mud-water mixture, reduce membrane pollution, and prolong the service life of the membrane; The outer layer is in an aerobic state and nitrification occurs, while the inner biofilm is in anoxic/anaerobic state and denitrification occurs. Simultaneous denitrification is realized, which greatly enhances the removal of total nitrogen by the system.

However, one of the biggest disadvantages of current conventional membrane bioreactors is that they often require continuous aerobic aeration. Specifically, because the existing conventional membrane bioreactor aeration system uses continuous aeration, the aeration energy consumption accounts for as high as 60%-80% of the entire operation energy consumption, resulting in high overall operating costs. In addition, due to continuous aeration, problems such as serious membrane pollution and short service life will occur, which limit its practical use in sewage treatment.

Therefore, there is an urgent need in this field for a new composite biofilm reactor device, which can reduce energy consumption, slow down membrane fouling and prolong service life while efficiently treating wastewater, thereby reducing the overall cost of sewage treatment.

Utility model content

The utility model provides a composite membrane bioreactor with low energy consumption, aiming at improving the load impact resistance of the system, slowing down membrane pollution, saving operation energy consumption, and at the same time obtaining stable nitrogen and phosphorus removal effects.

In one aspect, the utility model provides a composite membrane bioreactor with low energy consumption. The composite membrane bioreactor with low energy consumption includes: a bioreactor main body, a membrane assembly and an aeration tube, wherein the membrane assembly Located below the interior of the bioreactor main body, the interior of the bioreactor main body is divided into two symmetrical areas using a deflector, and the membrane modules are respectively located in the two symmetrical areas; the two The aeration pipes are respectively arranged in the symmetrical area, and the aeration pipes are respectively connected with electric valves, and the electric valves respectively control the cycle of the aeration pipes to aerate alternately; and the main body of the bioreactor is also arranged With carrier filler.

In a preferred embodiment, the low energy consumption composite membrane bioreactor also includes a water inlet system, the water inlet system is installed outside the main body of the bioreactor, and the water inlet system includes an inlet water pump and a grid, The filter aperture of the grid is 1-3mm.

In yet another preferred embodiment, the grate is a stainless steel grate.

In another preferred embodiment, the low energy consumption composite membrane bioreactor also includes a water outlet system, the system is installed outside the main body of the bioreactor, and the water outlet system includes a vacuum negative pressure gauge, an outlet water flow rate Meter and production water pump.

In yet another preferred embodiment, the produced water pump operates in a periodic intermittent operation mode, and the pumping and stopping times are about 4-10 minutes and 1-5 minutes respectively.

In another preferred embodiment, the low energy consumption composite membrane bioreactor further includes a blower, and the blower is connected to the electric valve and the aeration pipe through an air supply pipeline.

In another preferred embodiment, the aeration tube is a perforated aeration tube or a microporous aeration tube, and the aeration tubes are respectively arranged under the membrane stack in two symmetrical areas for alternate aeration. gas.

In yet another preferred embodiment, the aeration time is about 30-40 seconds.

In another preferred embodiment, the low-energy composite membrane bioreactor also includes a sludge discharge pipe connected to the bottom of the bioreactor body, and a static pressure pipe located inside the bioreactor body. liquid meter.

In another preferred embodiment, the low energy consumption composite membrane bioreactor also includes the water inlet pump, the vacuum negative pressure gauge, the water outlet flow meter, the produced water pump, the static pressure liquid The main control system connected with the meter, the mud discharge pipe, the electric valve and the blower.

In another preferred embodiment, the carrier filler includes one or more of the following: powder filler activated carbon (PAC), granular activated carbon (GAC), sponge, spherical filler, calcium alginate.

In another preferred embodiment, the membrane assembly includes a plurality of hollow fiber composite membrane membranes, and the hollow fiber composite membrane membranes include polyvinyl chloride (PVC) membranes or polyvinylidene fluoride (PVDF) membranes piece.

The working principle of the composite membrane bioreactor of the utility model is as follows when in use: the sewage to be treated enters the main body of the bioreactor after being filtered by the inlet pump, and then enters the main body of the bioreactor. The aeration system continuously supplies air to the aeration pipe, and the membrane unit The deflector set in between divides the membrane unit into two symmetrical areas. By controlling the electric valve switch of the aeration pipe, the alternate cycle aeration of the area is realized, and the aeration makes the sludge mixture and filler evenly distributed to the membrane unit. Inside. When one area is aerated, an aerobic environment is formed in the area, organic matter is rapidly decomposed, aerobic nitrification, and aerobic phosphorus uptake occur; the other area forms an anoxic/facultative environment, denitrification, anoxic phosphorus release occur. The two areas continuously realize the conversion of aerobic and anoxic/facultative environmental conditions through alternating cycle aeration, which provides symbiotic conditions for the growth of nitrifying bacteria and denitrifying bacteria, thereby achieving efficient nitrogen and phosphorus removal. At the same time, the growth of biofilm on the carrier filler increases the total microbial mass in the bioreactor, reduces the organic load of the system, reduces the sludge concentration, and slows down the membrane fouling. (EPS) adsorption degradation can also delay membrane fouling. Throughout the treatment process, the main control device controls the operation of the water inlet system, aeration system, and water outlet system.

Description of drawings

Figure 1 is a schematic structural view of an exemplary embodiment of a low-energy composite membrane bioreactor of the present invention.

The low-energy composite membrane bioreactor comprises: an inlet pump 1; a grid 2; a carrier filler 3; a membrane assembly 4; a first aeration pipe 5-1 and a second aeration pipe 5-2; Vacuum negative pressure gauge 7; produced water flow meter 8; produced water pump 9; main control system 10; static pressure liquid level gauge 11; mud discharge pipe 12; first electric valve 13-1 and second electric valve 13-2; blower 14; and bioreaction body zone 15.

detailed description

The utility model will be further described below in conjunction with the accompanying drawings, but it should be understood that they are only used to illustrate the utility model and are not intended to limit the scope of the utility model.

As shown in Figure 1 is the low-energy composite membrane bioreactor of the present invention, which includes: biological reaction main body 15, membrane group device 4, first aeration pipe 5-1 and second aeration pipe 5-2 and carrier Packing 3, wherein the membrane assembly device 4 is arranged below the inside of the bioreactor body 15, and the inside of the bioreactor body 15 is divided into two symmetrical areas by using a deflector 6, and the membrane assembly The devices 4 are respectively located in two symmetrical areas.

The lower part of the deflector 6 is about 30-45 cm away from the bottom of the bioreactor body 15, and the upper part is about 5-15 cm away from the liquid surface of the bioreactor body 15.

Two independent aeration pipes, the first aeration pipe 5-1 and the second aeration pipe 5-2 are respectively installed below the membrane unit 4 in two symmetrical areas, 15 meters away from the main body of the biological reaction. The bottom of the pool is about 20-40cm. The two aeration pipes, the first aeration pipe 5-1 and the second aeration pipe 5-2 are connected with the first electric valve 13-1 and the second electric valve 13-2 and then connected with the inlet of the blower 14. catch.

The membrane module 4 is connected to the vacuum negative pressure gauge 7 through pipelines, and the generated sewage is discharged through the produced water pump 9 .

The commissioning operation is as follows: the waste water flows into the grid 2 through the water inlet pump 1, and enters the biological reaction main area 15 after being filtered by the grid 2. The first electric valve 13-1 and the second electric valve 13-2 control two aeration pipes, and the first aeration pipe 5-1 and the second aeration pipe 5-2 alternately circulate aeration. That is, the first aeration pipe 5-1 performs aeration, the second aeration pipe 5-2 stops aeration, then the second aeration pipe 5-2 aerates, the first aeration pipe 5-1 stops aeration, and the aeration The air time is about 30-40s respectively, and the cycle alternates like this. Under the action of aeration, the sludge mixture and carrier filler 3 are evenly distributed to one side of the deflector 6 to form an aerobic environment, while the other side forms an anoxic environment. In the two symmetrical areas, aerobic-anoxic-combined Oxygen environments are alternately distributed. The membrane module 4 is connected to the product water pump 9 through pipelines to pump out water, the suction pressure is about 0-60kPa, and the product water flux is about 1-120L/m ² .h. The hydrostatic liquid level gauge 11 shows high and low water levels. When the water level is low, the main control system 10 starts the water intake pump 1 for water intake, and when the water level is high, stops the water intake pump 7 for water intake. The produced water pump 9 runs intermittently periodically, and the pumping and stopping times are about 4-10 minutes and 1-5 minutes respectively.

Beneficial Effects of Utility Models

In the utility model, fillers are added to the main body of the bioreactor, so that a large number of microorganisms are attached to the fillers, effectively forming biofilms, improving the system's ability to resist load impacts, slowing down membrane fouling and reducing membrane cleaning. frequency.

In the utility model, by changing the continuous aeration mode of the traditional conventional membrane bioreactor, the membrane unit is divided into two symmetrical areas, which not only reduces the demand for energy consumption, but also realizes synchronous nitrification and denitrification in the same reactor, enhancing The effect of nitrogen and phosphorus removal in the system is improved.

In the utility model, the membrane assembly adopts composite hollow fiber membranes, which can effectively prevent broken filaments.

Although the utility model has been described in detail for the purpose of clarity and understanding, after reading the description of the application, those skilled in the art will understand that, without departing from the spirit and essence of the utility model, the utility model can be Various modifications and changes are made to the utility model, and these modifications and changes all fall within the scope included in the appended claims and their equivalents.

Claims (9)

1. a composite membrane bioreactor with low energy consumption, said composite membrane bioreactor with low energy consumption comprises: bioreactor main body (15), membrane group device (4) and the first aeration pipe (5-1) and the second Two aeration pipes (5-2), are characterized in that: The membrane stack (4) is located below the interior of the bioreactor body (15), and the interior of the bioreactor body (15) is divided into two symmetrical areas using a deflector (6). The membrane assembly (4) is respectively located in the two symmetrical areas; The first aeration pipe (5-1) and the second aeration pipe (5-2) are respectively arranged in the two symmetrical areas, and the first aeration pipe (5-1) and the second aeration pipe (5-1) The air pipe (5-2) is respectively connected with the first electric valve (13-1) and the second electric valve (13-2), and the first electric valve (13-1) and the second electric valve (13-2) ) respectively controlling the first aeration tube (5-1) and the second aeration tube (5-2) to circulate and alternately aerate; and Carrier fillers (3) are also arranged in the bioreactor main body (15). 2. low energy consumption composite membrane bioreactor as claimed in claim 1, is characterized in that, described low energy consumption composite membrane bioreactor also comprises water inlet system, and described water inlet system is installed outside described bioreactor main body , the water inlet system includes a water inlet pump (1) and a grille (2), and the filter aperture of the grille (2) is 1-3 mm. 3. low energy consumption composite membrane bioreactor as claimed in claim 1, is characterized in that, described low energy consumption composite membrane bioreactor also comprises water outlet system, and described water outlet system is installed outside described bioreactor main body, so The water outlet system includes a vacuum negative pressure gauge (7), an outlet water flow meter (8) and a produced water pump (9). 4. the low energy consumption composite membrane bioreactor as described in any one in claim 1-3, is characterized in that, described low energy consumption composite membrane bioreactor also comprises blower (14), and described blower (14) passes The air supply pipeline is connected with the first electric valve (13-1) and the second electric valve (13-2) and the first aeration pipe (5-1) and the second aeration pipe (5-2) . 5. the low energy consumption composite membrane bioreactor as described in any one in claim 1-3, is characterized in that, described first aeration pipe (5-1) and the second aeration pipe (5-2) It is a perforated aeration tube or a microporous aeration tube, and the first aeration tube (5-1) and the second aeration tube (5-2) are respectively arranged under the membrane stack device (4) for Alternate aeration. 6. low energy consumption composite membrane bioreactor as claimed in claim 1, is characterized in that, described low energy consumption composite membrane bioreactor also comprises water inlet system, and described water inlet system is installed outside described bioreactor main body , the water inlet system includes a water inlet pump (1) and a grid (2), the filter aperture of the grid (2) is 1-3mm, and the low energy consumption composite membrane bioreactor also includes a water outlet system, the The water outlet system is installed outside the main body of the bioreactor, and the water outlet system includes a vacuum negative pressure gauge (7), an outlet water flow meter (8) and a produced water pump (9), and the low energy consumption composite membrane bioreactor also includes a blower (14), the blower (14) is connected with the first electric valve (13-1) and the second electric valve (13-2) and the first aeration pipe (5-1) and the first electric valve (13-2) through the air supply pipeline The second aeration pipe (5-2) links to each other, and the low-energy composite membrane bioreactor also includes a sludge discharge pipe (12) connected to the bottom of the bioreactor main body (15), and a The hydrostatic liquid meter (11) inside the device main body (15). 7. low energy consumption composite membrane bioreactor as claimed in claim 6, is characterized in that, described low energy consumption composite membrane bioreactor also comprises and described inlet pump (1), described vacuum negative pressure gauge (7) , the outlet water flow meter (8), the produced water pump (9), the static pressure liquid meter (11), the mud discharge pipe (12), the first electric valve (13-1) and The main control system (10) to which the second electric valve (13-2) and the blower (14) are connected. 8. The low-energy composite membrane bioreactor according to any one of claims 1-3, characterized in that, the carrier filler (3) comprises one or more of the following: powder filler activated carbon (PAC), Granular activated carbon (GAC), sponge, spherical fillers, calcium alginate. 9. The low-energy composite membrane bioreactor according to any one of claims 1-3, wherein the membrane assembly (4) comprises a plurality of hollow fiber composite membrane membranes, and the hollow fiber composite The diaphragm includes a polyvinyl chloride (PVC) diaphragm or a polyvinylidene fluoride (PVDF) diaphragm.