CN115872521A

CN115872521A - Membrane bioreactor

Info

Publication number: CN115872521A
Application number: CN202111125259.5A
Authority: CN
Inventors: 韩爱龙; 孟繁明; 刘燕; 沈军彦; 郭庆贺
Original assignee: Beijing Crystec Technologies Co ltd
Current assignee: Beijing Crystec Technologies Co ltd
Priority date: 2021-09-26
Filing date: 2021-09-26
Publication date: 2023-03-31

Abstract

The invention discloses a membrane bioreactor, and belongs to the technical field of sewage treatment. The method comprises the following steps: the device comprises a sewage treatment tank, an aeration device at the bottom of the sewage treatment tank, a plurality of flat membrane assemblies in the sewage treatment tank, a suction pump, an air blower and an air compressor outside the sewage treatment tank; the flat membrane component consists of a bracket, a self-cleaning spray head, a membrane unit, a central pipe penetrating through a central circular hole of the membrane unit, a first end, a second end and a sealing ring between the membrane units; the diaphragm units are stacked together according to the sequence of a first diaphragm, a first flow guide net, a support plate, a second flow guide net and a second diaphragm, the diaphragm units are circular, the periphery of the diaphragm units is sealed, and the center of the diaphragm units is a circular hole; the first membrane and the second membrane are formed by compounding polyether sulfone membranes and non-woven fabrics and are sealed back to back. The invention has the advantages of simple process, strong impact load resistance, small occupied area, good treatment effect and better environmental and economic benefits.

Description

Membrane bioreactor

Technical Field

The invention relates to a membrane bioreactor, in particular to a membrane bioreactor of a flat membrane with strong pollution resistance and a self-cleaning function, belonging to the technical field of sewage treatment.

Background

The Membrane Bioreactor (MBR) is a new sewage treatment technology integrating membrane separation and biodegradation, and compared with the traditional biological treatment, the technology has the advantages of high pollutant removal efficiency, good and stable effluent quality, low residual sludge yield, high bearable organic load, small occupied area, easiness in automatic control, convenience in operation and management and the like, and has a good development prospect.

At present, a membrane bioreactor can be divided into a built-in type and an external type according to different use states of membranes, wherein the built-in type is also called as an immersed membrane bioreactor, and is relatively low in energy consumption due to low-pressure water pumping, so that the membrane bioreactor is one of the most widely applied membrane bioreactors. The immersed membrane modules adopted at home and abroad at present are basically hollow fiber membranes and flat membranes. The hollow fiber membrane has the advantages of high packing density, but has the defects of easy filament breakage, easy blockage, difficult cleaning and the like. The flat membrane has lower filling density than that of hollow fiber membrane, and has the advantages of high membrane strength, less blocking and long service life. The current membrane bioreactor applying the flat membrane has the defects of easy pollution, incomplete pollutant cleaning, high energy consumption and the like due to unreasonable material and structural design.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides a membrane bioreactor of a flat membrane with strong pollution resistance and an instant self-cleaning function by starting from membrane material and component design.

The invention relates to a membrane bioreactor, which comprises a sewage treatment tank, an aeration device at the bottom of the sewage treatment tank, a plurality of flat membrane components in the sewage treatment tank, scrubbing fillers filled in the sewage treatment tank, a suction pump, an air blower and an air compressor outside the sewage treatment tank, wherein each flat membrane component consists of a support, a self-cleaning spray head, a membrane unit, a central pipe penetrating through a central circular hole of the membrane unit, a first end, a second end and a sealing ring between the membrane units, the central pipe of the flat membrane component is connected with the suction pump through a water pipe, and the aeration device is connected with the air blower through a gas pipeline. The diaphragm unit is stacked together according to the sequence of the first diaphragm, the first flow guide net, the supporting plate, the second flow guide net and the second diaphragm, the diaphragm unit is circular, the periphery of the diaphragm unit is sealed, and the center of the diaphragm unit is a circular hole. The supporting plate in the membrane unit is provided with a radiation-shaped flow guide channel. The first membrane and the second membrane of the membrane unit are formed by compounding non-woven fabrics and polyether sulfone membranes coated on the non-woven fabrics, the polyether sulfone membranes are formed by mixing polyether sulfone, dimethylacetamide, polyethylene glycol 400, polyvinylpyrrolidone and calcium chloride according to the weight percentage of 10-30, 60-80, 1-10, 1-5 and 1-5 respectively, stirring, curing at 50-90 ℃, defoaming, coating and water bath gelling, the non-woven fabric surface of the first membrane in the membrane unit is sealed with the first flow guide net, the non-woven fabric surface of the second membrane is sealed with the second flow guide net, and the first membrane and the second membrane are sealed back to back. The scrubbing filler in the membrane bioreactor is polyurethane biological sponge filler with the aperture of 5 ppi-120 ppi.

The invention has the beneficial effects that: the flat membrane with strong pollution resistance is prepared by adopting polyether sulfone as a base material and utilizing a membrane material formula; the flat membrane component which is not easy to be polluted and blocked is adopted, and the design of scrubbing filler is added, so that the pollution resistance of the membrane bioreactor is further improved, the service life is prolonged, and the energy consumption is reduced.

The invention has the advantages of simple process, strong impact load resistance, small occupied area, good treatment effect and better environmental and economic benefits.

Drawings

FIG. 1 is a schematic structural diagram of the present invention, FIG. 2 is a schematic structural diagram of a flat membrane module, and FIG. 3 is a schematic structural diagram of a membrane unit, wherein 1 is a sewage treatment tank, 2 is an aeration device, 3 is a flat membrane module, 4 is scrubbing filler, 5 is an air blower, 6 is a suction pump, 7 is an air compressor, 8 is a self-cleaning spray head, 9 is a membrane unit, 10 is a central pipe, 11 is a first end, 12 is a second end, 13 is a support, 14 is a sealing ring, 15 is a first membrane, 16 is a first flow guide net, 17 is a support plate, 18 is a second flow guide net, and 19 is a second membrane.

Detailed Description

The present invention will be described in further detail with reference to specific examples.

The first embodiment is as follows:

the utility model provides a membrane bioreactor, be applied to the sewage treatment of a certain agriculture ecological garden, including sewage treatment pond (1), aeration equipment (2) of sewage treatment pond (1) bottom, two sets of flat membrane module (3) in sewage treatment pond (1), the filler (4) are cleaned in the intussuseption of sewage treatment pond (1), outside suction pump (6) and air-blower (5) in sewage treatment pond (1), air compressor machine (7), wherein flat membrane module (3) comprise support (13), from cleaning shower nozzle (8), diaphragm unit (9) and center tube (10) that run through in diaphragm unit center round hole, first end (11), sealing washer (14) between second end (12) and diaphragm unit (9), wherein center tube (10) and suction pump (6) water piping connection of flat membrane module, aeration equipment (2) are connected through gas piping with air-blower (5), from cleaning shower nozzle (8) are connected through gas piping with air compressor machine (7). The diaphragm unit is stacked together according to the sequence of a first diaphragm (15), a first flow guide net (16), a support plate (17), a second flow guide net (18) and a second diaphragm (19), and is circular, the periphery of the diaphragm unit is sealed, and the center of the diaphragm unit is a circular hole. The supporting plate (17) in the membrane unit is provided with a radiation-shaped flow guide channel. The first membrane and the second membrane of the membrane unit are formed by compounding non-woven fabrics and polyether sulfone membranes coated on the non-woven fabrics, the polyether sulfone membranes are formed by mixing polyether sulfone, dimethylacetamide, polyethylene glycol 400, polyvinylpyrrolidone and calcium chloride according to the weight percentages of 12%, 70%, 10%, 4% and 4% respectively, stirring, curing at 80 ℃, defoaming, coating and water bath gelling, the non-woven fabric surface of the first membrane in the membrane unit is sealed with the first flow guide net, and the non-woven fabric surface of the second membrane is sealed with the second flow guide net, namely the first membrane and the second membrane are sealed back to back. The scrubbing filler in the membrane bioreactor is polyurethane biological sponge filler with the aperture of 50 ppi-70 ppi.

Claims

1. A membrane bioreactor, characterized by comprising: sewage treatment pond, the aeration equipment of sewage treatment bottom of the pool portion, a plurality of dull and stereotyped membrane module in the sewage treatment pond, the filler is cleaned in the intussuseption of sewage treatment pond, outside suction pump, air-blower, the air compressor machine in sewage treatment pond, dull and stereotyped membrane module comprises support, self-cleaning shower nozzle, diaphragm unit and the sealing washer that runs through between center tube, first end, second end and the diaphragm unit of diaphragm unit center round hole, the center tube and the suction pump of dull and stereotyped membrane module lead to pipe connection, aeration equipment passes through gas piping connection with the air-blower, the self-cleaning shower nozzle passes through gas piping connection with the air compressor machine.

2. The membrane bioreactor as claimed in claim 1, wherein the membrane units are stacked in the order of the first membrane, the first flow guide net, the support plate, the second flow guide net and the second membrane, the membrane units are circular, the periphery of the membrane units is sealed, the center of the membrane units is a circular hole, and the support plate is provided with a radial flow guide channel.

3. The membrane bioreactor as claimed in claims 1-2, wherein the first membrane and the second membrane of the membrane unit are formed by compounding non-woven fabrics and polyether sulfone membranes coated on the non-woven fabrics, the polyether sulfone membranes are formed by mixing polyether sulfone, dimethylacetamide, polyethylene glycol 400, polyvinylpyrrolidone and calcium chloride according to the weight percentage of 10-30, 60-80, 1-10, 1-5 and 1-5 respectively, stirring, curing at 50-90 ℃, defoaming, coating and gelling in a heat preservation manner, the non-woven fabric surface of the first membrane in the membrane unit is sealed with the first flow guide net, the non-woven fabric surface of the second membrane is sealed with the second flow guide net, namely the first membrane and the second membrane are sealed back to back, the scrubbing filler is polyurethane biological sponge filler, and the pore size is 5 ppi-120 ppi.