Multilayer horizontally-arranged MABR sewage treatment device and use method thereof

Abstract

The invention discloses a multi-layer horizontally-arranged MABR sewage treatment device and a use method thereof, and belongs to the technical field of municipal sewage treatment. The device comprises a square steel supporting frame, a bubble-free aeration membrane assembly, a tubular aerator, a tail gas release pipe, an electric valve and a check valve, a gas inlet end is arranged on one side of the upper portion of the square steel supporting frame, a tail gas collecting end is arranged on the other side of the upper portion of the square steel supporting frame, and the bubble-free aeration membrane assembly and the tubular aerator are fixed in the square steel supporting frame and at the bottom of the square steel supporting frame respectively. One end of the tail gas release pipe is connected with the upper part of the tail gas collecting end, and the other end is connected with the tubular aerator; the electric valve and the check valve are arranged on the tail gas release pipe. Gas is supplied to the device through gas supply equipment, the gas enters from the gas inlet end and is supplied to the bubble-free aeration membrane assembly, tail gas is firstly discharged to the tail gas release pipe through square steel and conveyed to the tubular aerator, and the time-space switch is used for controlling the frequency to scrub the bubble-free aeration membrane assembly. The problems of breakage and air leakage of the end part of the membrane assembly can be solved, the MABR oxygen utilization efficiency is improved, and the service life of the membrane assembly is prolonged.

Description

Technical Field

[0001] The present invention discloses a multi-layer horizontally arranged MABR sewage treatment device and its usage method, belonging to the technical field of municipal sewage treatment. Background Art

[0002] Traditional MABR (Chinese name: Membrane Aerated Biofilm Reactor) membrane modules draw on the MBR design concept and are arranged vertically in rows. Utilizing the turbulent state of sewage, the membrane filaments swing left and right, and to a certain extent, have a self-cleaning function. This structural form is mainly applied to integrated equipment, making full use of the longitudinal water depth and saving the floor area of the reactor. However, in actual operation, after the membrane filaments are fouled, their weight increases exponentially, and the downward stretching causes deformation of the top membrane shell or even breakage and air leakage of the membrane filaments. In addition, for horizontally arranged MABR membrane modules, after a single membrane filament breaks, the resistance of the bubbles in the vertical direction is small, and they directly rise and are released into the air, resulting in a decrease in the dissolved oxygen utilization rate.

[0003] Patent CN 119797589 A uses horizontally arranged MABR membrane modules, and the air supply system supplies air to the membrane modules in series from top to bottom. The bottom layer is micro-nano aeration. Although the pressure in the membrane cavity is reduced, this form is mainly used for the ecological restoration and treatment of rivers and lakes. The scouring ability of micro-nano aeration on the membrane filaments is weak, and it cannot solve the problem of reduced oxygen transfer efficiency of MABR caused by too thick biofilm in the scenario of highly polluted municipal sewage. In addition, when the air supply equipment stops supplying air, pollutants enter the micro-nano aerator with the water flow, and the membrane cavity is filled with water. After restarting, the oxygen transfer efficiency of MABR decreases in the short term, and in the long term, problems such as pollution and blockage of the MABR membrane cavity will occur, greatly reducing the service life of the membrane module. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem of doubled weight of the vertical membrane module leading to end breakage and air leakage, improve the oxygen utilization efficiency of MABR, extend the service life of the membrane module, and provide a horizontally arranged MABR sewage treatment device and its usage method.

[0005] The present invention provides a multi-layer horizontally arranged MABR sewage treatment device, which includes a square steel support frame, a bubble-free aeration membrane module, a tube-type aerator, a tail gas release pipe, an electric valve and a check valve. One side of the upper part of the square steel support frame is provided with an air inlet end, and the other side of the air inlet end is provided with a tail gas collection end. The bubble-free aeration membrane module is fixed inside the square steel support frame, and the tube-type aerator is fixed at the bottom of the square steel support frame. One end of the tail gas release pipe is connected to the upper part of the tail gas collection end, and the other end is connected to the tube-type aerator. The electric valve and the check valve are arranged on the tail gas release pipe; several circular card slots are reserved on both sides of the square steel support frame from top to bottom; the bubble-free aeration membrane module is composed of a membrane shell and bubble-free aeration membrane filaments; the membrane shell includes a sealing end and a through end; the through end is communicated with the main gas pipeline of the square steel support frame, and the sealing end and the through end are respectively fixed in the circular card slots and are horizontally arranged at intervals from top to bottom; the opening frequency of the electric valve is controlled by a time control switch.

[0006] Preferably, the square steel support frame is made of 306L stainless steel and is assembled by welding. The bottoms of the air inlet end and the tail gas collection end are sealed, the middle is through, and the top is an internal thread joint; several lifting lugs are welded at the top of the support frame.

[0007] Preferably, the bubble-free aeration membrane modules are arranged in multiple layers from top to bottom, with an interval of 15-20 cm between each layer, the top is 10-15 cm away from the water surface, and the lowermost bubble-free aeration membrane module is 30-50 cm away from the bottom of the pool.

[0008] Preferably, the membrane shell is made of non-plasticized polyethylene material, and epoxy resin is poured inside the sealing end, and the pouring length is 20-30 mm; the inner cavity diameter of the membrane shell is 20-25 mm, and the sealing end and the through end respectively extend outward by 25-30 mm.

[0009] Preferably, the bubble-free aeration membrane filaments are in the shape of hollow fibers and are fixed inside the membrane shell with epoxy resin, extending 3-5 mm into the inner cavity of the membrane shell.

[0010] Preferably, the outermost layer of the tube-type aerator is made of ethylene propylene diene monomer (EPDM) rubber, is located at the lowermost end of the square steel support frame, is 30-50 cm away from the bottom of the pool, is horizontally arranged in 2-3 rows, and the horizontal spacing is 20-30 cm.

[0011] The present invention provides a method for using a multi-layer horizontally arranged MABR sewage treatment device, which includes the following steps: 1) Fix the lifting lugs with nylon ropes, and use a crane to hang the nylon ropes to place the main device into the sewage to be treated, ensuring that the plane where the spreading direction of the bubble-free aeration membrane module is parallel to the water flow direction; 2) Supply gas to the device using a gas supply equipment. The gas enters from the top of the intake end of the square steel support frame and is supplied downward in parallel to multiple groups of bubble-free aeration membrane modules arranged in a plane. The tail gas collected at the tail gas collection end of the other side of the square steel support frame is first discharged to the tail gas release pipe through the square steel, and the tail gas release pipe transports the tail gas to the tube aerator; 3) The electric valve adopts an automatic control operation mode. The time control switch controls the opening frequency to open once every 4 minutes, and the operation duration each time is 30s. The tail gas is released from the tube aerator to scrub the bubble-free aeration membrane module; 4) When the device is restarted for the second time, first adjust the time control switch to the manual mode, keep the electric valve in the open state, then turn on the gas supply equipment and keep it running for 5 - 10 minutes to quickly drain the accumulated water in the device and scrub the bubble-free aeration membrane filaments. Finally, adjust the time control switch to the automatic mode to resume normal operation; 5) When obvious large bubbles appear above the bubble-free aeration membrane module, lift out the MABR sewage treatment device and analyze the reasons. If a single bubble-free aeration membrane filament is broken, adopt the treatment method of tying 2 - 3 knots. If there is air leakage at the connection root of the membrane shell and the bubble-free aeration membrane filament, remove the single membrane module of this layer, replace it with a new membrane module, and finally put it into the sewage and resume operation according to step 4);

[0012] Compared with the prior art, the present invention aims at the phenomenon of membrane filament breakage and air leakage caused by the deformation of the membrane shell at the top of the traditional vertical MABR for municipal sewage treatment, improves the existing MABR river sewage treatment device with a plane layout, and improves the oxygen transfer efficiency and service life of the MABR membrane module. The specific beneficial effects are as follows: (1) Effectively avoid the membrane pollution problem during intermittent operation and extend the service life: The use scenario of the traditional plane layout type MABR is a river. If it is used for municipal sewage treatment, when adopting an intermittent sewage treatment operation mode or during the maintenance of the gas supply equipment, pollutants enter the inner cavity of the membrane filaments with the water flow, resulting in a membrane pollution problem. The present invention adds a check valve to the tail gas release pipe and uses a tube aerator to replace the traditional perforated pipe aeration or microporous aeration, which can effectively solve the membrane pollution problem during the intermittent operation of MABR and extend the service life; (2) Automatically control the scrubbing of the membrane filaments, synchronously improve the oxygen transfer efficiency and oxygen transfer rate, and regulate the thickness of the biofilm: On the one hand, by adopting a planar layout type MABR, when the bottom tube aerator is closed, the theoretical dissolved oxygen transfer efficiency of MABR is close to 100%. However, with the accumulation of nitrogen content and the condensation of water molecules, the dissolved oxygen transfer rate decreases. After the electric valve is automatically controlled to open, the tail gas is instantaneously released, and the inner cavity of the membrane filaments is flushed. As the tail gas rises, it passes through multiple membrane modules. Due to the delay effect, the residual oxygen in the tail gas is utilized to a greater extent, simultaneously improving the oxygen transfer efficiency and the oxygen transfer rate. On the other hand, during the rising process of the tail gas, the membrane filaments are jittered, and the overly thick biofilm attached to the surface of MABR is scrubbed and reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 is a schematic structural view of the horizontally arranged MABR sewage treatment device of the present invention.

[0014] Attached Figure 2 is a schematic structural view of a single MABR membrane module of the present invention.

[0015] Attached Figure 3 is a front view of the horizontally arranged MABR sewage treatment device of the present invention.

[0016] Attached Figure 4 is a side view of the horizontally arranged MABR sewage treatment device of the present invention.

[0017] In the figures: 1, square steel support frame; 2, air inlet end; 3, tail gas collection end; 4, bubble-free aeration membrane module; 5, tube aerator; 6, tail gas release pipe; 7, electric valve; 8, time control switch; 9, check valve; 10, plugging end; 11, through end; 12, membrane shell; 13, bubble-free aeration membrane filaments; 14, lifting lug; 15, epoxy resin; 16, circular card slot. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The present invention will be further described and explained below in conjunction with the drawings and specific embodiments. The technical features of each embodiment of the present invention can be combined correspondingly without conflict.

[0019] As Figure 1 shown, as a preferred embodiment of the specific embodiment of the present invention, this embodiment provides a multi-layer horizontally arranged MABR sewage treatment device and its usage method.

[0020] The processing device includes a square steel support frame 1, a bubble-free aeration membrane module 4, a tube-type aerator 5, a tail gas release pipe 6, an electric valve 7 and a check valve 9. On one side of the upper part of the square steel support frame 1, an air inlet end 2 is provided, and on the other side of the air inlet end 2, a tail gas collection end 3 is provided. The bubble-free aeration membrane module 4 is fixed inside the square steel support frame 1, and the tube-type aerator 5 is fixed at the bottom of the square steel support frame 1. One end of the tail gas release pipe 6 is connected to the upper part of the tail gas collection end 3, and the other end is connected to the tube-type aerator 5. The electric valve 7 and the check valve 9 are arranged on the tail gas release pipe 6; A number of circular card slots 16 are reserved on both sides of the square steel support frame 1 from top to bottom; The bubble-free aeration membrane module 4 is composed of a membrane shell 12 and bubble-free aeration membrane filaments 13; The membrane shell 12 includes a sealing end 10 and a through end 11; The through end 11 is communicated with the main gas pipeline of the square steel support frame 1, and the sealing end 10 and the through end 11 are respectively fixed in the circular card slots 16 and are horizontally spaced from top to bottom; The opening frequency of the electric valve 7 is controlled by a time control switch 8.

[0021] In this embodiment, as Figure 1 shown, the device is supplied with gas by a gas supply device. The gas enters from the top of the air inlet end 2 of the square steel support frame 1 and is supplied downward in parallel to multiple groups of horizontally arranged bubble-free aeration membrane modules 4. The tail gas collected by the tail gas collection end 3 of the other side square steel support frame is first discharged to the tail gas release pipe 6 through the square steel, and the tail gas release pipe 6 transports the tail gas to the tube-type aerator 5. The opening frequency of the electric valve 7 is controlled by the time control switch 8 to scrub the upper layer of the bubble-free aeration membrane module 4.

[0022] In this embodiment, the square steel support frame 1 is made of 306L stainless steel and is assembled by welding. The dimensions are 1150 mm in width × 2140 mm in length × 2000 mm in height. The bottoms of the air inlet end 2 and the tail gas collection end 3 are sealed, the middle is through, and the top is an internal thread joint. 4 lifting lugs 14 are welded at the top of the support frame; The bubble-free aeration membrane modules 4 are arranged in 7 layers from top to bottom, with a spacing of 20 cm between each layer, 10 cm from the water surface at the top, and 50 cm from the bottom of the pool for the lowermost bubble-free aeration membrane module 4; The membrane shell 12 is made of non-plasticized polyethylene material, and epoxy resin is poured inside the sealing end, with a pouring length of 25 mm; The inner cavity diameter of the membrane shell 12 is 20 mm, and the sealing end 10 and the through end 11 respectively extend outward by 25 mm; The bubble-free aeration membrane filaments 13 are in the shape of hollow fibers and are fixed inside the membrane shell with epoxy resin, extending 5 mm into the inner cavity of the membrane shell 12; The outermost layer of the tube-type aerator 5 is made of ethylene propylene diene monomer rubber and is horizontally arranged at the lowermost end of the square steel support frame 1, 30 cm from the bottom of the pool, with 2 horizontal rows arranged, and the horizontal spacing is 20 cm.

[0023] Based on the above MABR sewage treatment device, nylon ropes are used to fix the surrounding lifting lugs 14, and the crane hangs the nylon ropes and puts it into the sewage to be treated, ensuring that the plane of the membrane module is parallel to the plane where the water flow direction is located; use the air supply equipment to supply air to the device, and the gas enters from the top of the air inlet end 2 of the square steel support frame 1 and is supplied downward in parallel to multiple groups of flat-arranged bubbleless aeration membrane modules 4. The tail gas collected at the tail gas collection end 3 of the other side square steel support frame is first discharged to the tail gas release pipe 6 through the square steel, and the tail gas release pipe 6 transports the tail gas to the tube aerator 5. The time control switch 8 is used to control the opening frequency of the electric valve 7 to scrub the upper layer of bubbleless aeration membrane module 4; the electric valve 9 adopts an automatic control operation mode, and the time control switch 8 controls the opening frequency to be turned on once every 4 minutes, and the operation duration each time is 30s. The tail gas is released from the tube aerator 5 to scrub the bubbleless aeration membrane module 4.

[0024] When the device is restarted for the second time, first adjust the time control switch 8 to the manual mode, keep the electric valve 9 in the open state, then turn on the air supply equipment and keep it running for 8 minutes to quickly drain the accumulated water in the device and scrub the bubbleless aeration membrane filaments 13. Finally, adjust the time control switch 8 to the automatic mode to resume normal operation.

[0025] When obvious large bubbles appear above the bubbleless aeration membrane module 4, lift out the MABR sewage treatment device and analyze the reasons. If a single bubbleless aeration membrane filament 13 is broken, adopt the treatment method of tying 2 knots. If there is air leakage at the connection root of the membrane shell 12 and the bubbleless aeration membrane filament 13, remove the single membrane module of this layer, replace it with a new membrane module, and finally put it into the sewage and resume operation according to the above steps for the second startup of the device.

[0026] In this embodiment, aiming at the phenomenon of membrane filament breakage and air leakage caused by the deformation of the membrane shell at the top of the traditional vertical MABR for municipal sewage treatment, the existing flat-arranged MABR river sewage treatment device is improved. A check valve is added to the tail gas release pipe, and the tube aerator is used to replace the traditional perforated pipe aeration or microporous aeration, which can effectively solve the membrane pollution problem during the intermittent operation of MABR and extend the service life; after the electric valve is automatically controlled to open, the tail gas is instantly released, the inner cavity of the membrane filament is washed, and the tail gas passes through multiple layers of membrane modules during the rising process. Due to the time-delay effect, the residual oxygen in the tail gas is utilized to a greater extent, synchronously improving the oxygen transfer efficiency and oxygen transfer rate. On the other hand, during the rising process of the tail gas, the membrane filaments are shaken, and the too thick biofilm attached to the surface of MABR is scrubbed and reduced.

[0027] The above-described embodiments are only a preferred solution of the present invention, but it is not used to limit the present invention. Those of ordinary skill in the relevant technical fields can make various modifications without departing from the spirit and scope of the present invention. All technical solutions obtained by adopting equivalent replacements or equivalent transformations fall within the protection scope of the present invention.

Claims

1. A multi-layer horizontally arranged MABR sewage treatment device, characterized in that: It includes a square steel support frame (1), a bubble-free aeration membrane module (4), a tubular aerator (5), a tail gas release pipe (6), an electric valve (7) and a check valve (9). On one side of the upper part of the square steel support frame (1), an air inlet end (2) is provided, and on the other side of the air inlet end (2), a tail gas collection end (3) is provided. The bubble-free aeration membrane module (4) is fixed inside the square steel support frame (1), and the tubular aerator (5) is fixed at the bottom of the square steel support frame (1). One end of the tail gas release pipe (6) is connected to the upper part of the tail gas collection end (3), and the other end is connected to the tubular aerator (5). The electric valve (7) and the check valve (9) are arranged on the tail gas release pipe (6); Several circular clamping grooves (16) are reserved on both sides of the square steel support frame (1) from top to bottom; The bubble-free aeration membrane module (4) is composed of a membrane shell (12) and bubble-free aeration membrane filaments (13); The membrane shell (12) includes a sealing end (10) and a through end (11); The through end (11) is connected to the main gas pipeline of the square steel support frame (1), and the sealing end (10) and the through end (11) are respectively fixed in the circular clamping grooves (16), and are horizontally spaced from top to bottom; The opening frequency of the electric valve (7) is controlled by a time control switch (8).

2. The multi-layer horizontally arranged MABR sewage treatment device according to claim 1, characterized in that: The square steel support frame (1) is made of 306L stainless steel and is assembled by welding. The bottoms of the air inlet end (2) and the tail gas collection end (3) are sealed, the middle is through, and the top is an internal thread joint; Several lifting lugs (14) are welded at the top of the support frame.

3. The multi-layer horizontally arranged MABR sewage treatment device according to claim 1, wherein: The bubble-free aeration membrane modules (4) are arranged in multiple layers from top to bottom, with a spacing of 15 - 20 cm between each layer, the top is 10 - 15 cm from the water surface, and the lowermost bubble-free aeration membrane module is 30 - 50 cm from the bottom of the pool.

4. The multi-layer horizontally arranged MABR sewage treatment device according to claim 1, characterized in that: The membrane shell (12) is made of non-plasticized polyethylene material, and epoxy resin (15) is poured inside the sealing end (10), and the pouring length is 20 - 30 mm; The inner cavity diameter of the membrane shell is 20 - 25 mm, and the sealing end (10) and the through end (11) respectively extend outwards by 25 - 30 mm.

5. The multi-layer horizontally arranged MABR sewage treatment device according to claim 1, characterized in that: The bubble-free aeration membrane filaments (13) are in the shape of hollow fibers, and the membrane filaments are fixed inside the membrane shell (12) by epoxy resin and extend 3 - 5 mm into the inner cavity of the membrane shell (12).

6. The multi-layer horizontally arranged MABR sewage treatment device according to claim 1, wherein: The outermost layer of the tubular aerator (5) is made of ethylene propylene diene monomer rubber, and it is located at the lowermost end of the square steel support frame (1), 30 - 50 cm from the bottom of the pool, and is horizontally arranged in 2 - 3 rows with a horizontal spacing of 20 - 30 cm.

7. A method for using the multi-layer horizontally arranged MABR sewage treatment device according to claims 1 to 6, characterized in that: It includes the following steps: 1) Fix the lifting lugs (14) with nylon ropes, and use a crane to hang the nylon ropes to put the main device into the sewage to be treated, ensuring that the spreading direction of the bubble-free aeration membrane module (4) is parallel to the plane where the water flow direction is located; 2) Use a gas supply device to supply gas to the device. The gas enters from the top of the air inlet end (2) of the square steel support frame (1) and supplies gas downward in parallel to multiple groups of horizontally arranged bubble-free aeration membrane modules (4). The tail gas collected by the tail gas collection end (3) of the other side of the square steel support frame is first discharged to the tail gas release pipe (6) through the square steel, and the tail gas release pipe (6) transports the tail gas to the tubular aerator (5); 3) The electric valve (9) operates in an automatic control mode. The time control switch (8) controls the opening frequency to open once every 4 minutes, and the operation duration each time is 30 s. The tail gas is released from the tube aerator (5) to scrub the bubble-free aeration membrane module (4). 4) When the device is restarted for the second time, first adjust the time control switch (8) to the manual mode, keep the electric valve (9) in the open state, then start the air supply equipment and keep it running for 5 - 10 minutes to quickly drain the accumulated water in the device and scrub the bubble-free aeration membrane filaments (13). Finally, adjust the time control switch (8) to the automatic mode to resume normal operation. 5) When obvious large bubbles appear above the bubble-free aeration membrane module (4), lift out the MABR sewage treatment device and analyze the reasons. If a single bubble-free aeration membrane filament (13) is broken, use the treatment method of tying 2 - 3 knots. If there is air leakage at the connection root of the membrane shell (12) and the bubble-free aeration membrane filaments (13), remove the single membrane module of this layer, replace it with a new membrane module, and finally put it into the sewage and resume operation according to step 4).

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