MBR integrated device for assisting PACT purification

Abstract

The utility model discloses an MBR integrated device for assisting PACT purification, and belongs to the technical field of water treatment. The device consists of an MBR membrane pool, a backwashing tank, an air blower, a storage pipe, a reflux pump, a water inlet pipe, a water production pipe, a spraying pipe, a reflux pipe, a backwashing pipe and an MBR membrane, the MBR membrane is arranged in the MBR membrane pool, and a certain gap is reserved between the bottom of the MBR membrane and the bottom of the inner side of the MBR membrane pool; a plurality of groups of spraying devices are arranged on the spraying pipe above the MBR membrane tank; the storage pipe is vertically arranged in the MBR membrane tank; the device is also provided with a cleaning tank, and the MBR membrane to be subjected to off-line backwashing is placed in the cleaning tank. According to the MBR membrane cleaning device, online cleaning, online chemical cleaning and offline cleaning of the MBR membrane are achieved, the service life of the MBR membrane is guaranteed, meanwhile, the offline cleaning transportation cost is reduced, damage to equipment caused by repeated carrying is avoided, in addition, activated carbon powder is conveyed to a regeneration system through the storage pipe, and the recovery efficiency of the activated carbon powder is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to water treatment technical field, concretely relates to a kind of MBR (biological membrane filter) integrated device for assisting PACT (activated carbon adsorption sewage treatment technology) purification. BACKGROUND

[0002] PACT process can combine activated carbon adsorption and biological treatment technology to achieve the purpose of degrading COD. Microorganisms have the dual effects of oxidative decomposition and biological adsorption, which can restore the adsorption capacity of powdered activated carbon. After the adsorption of refractory organic matter by activated carbon, it can be slowly degraded in the biochemical tank. The activated carbon saturated with adsorption in the PACT tank can still be used as a carrier for microorganisms, especially nitrifying bacteria, effectively increasing the amount of activated sludge in the reactor, reducing organic load and nitrogen load, and improving the removal efficiency of organic pollutants and ammonia nitrogen in the biochemical system.

[0003] After the water treated by PACT process contains a large amount of activated carbon powder, a large amount of time is consumed for static settlement. The activated carbon powder cannot settle in the conventional MBR device under aeration, and is mainly enriched in the upper layer of the water body. To recover and reuse the activated carbon powder, the conventional bottom reflux method cannot meet the process requirements. To prevent the enrichment of a large amount of saturated activated carbon powder, the activated carbon powder in the upper layer of the water body needs to be discharged, but the conventional bottom discharge method mainly returns activated sludge, and the content of activated carbon powder is not high. If a large amount of activated sludge is degraded to produce a lot of ash powder in the regeneration system, the recovery rate of activated carbon powder is low.

[0004] At the same time, PACT process also produces a large amount of biochemical process foam. The formation of foam can be roughly divided into three categories, namely start-up foam, denitrification foam and biological foam. The production of biochemical process foam is inevitable, and it is difficult to remove in a short time due to the complexity of the influencing factors. In addition, PACT process adds a large amount of activated carbon powder, part of which adheres to the surface of the foam and floats in the surrounding area of the equipment under the action of wind force, causing environmental pollution and even causing personal injury.

[0005] The existing PACT process effluent adopts conventional secondary sedimentation tank process. Due to the presence of activated carbon powder, longer settling time is still needed after adding flocculant to ensure the turbidity requirement of effluent. In the prior art, MBR device is also used for PACT effluent treatment process, but the process integration degree is not high, and the functions of membrane filtration, membrane cleaning, foam treatment and carbon powder collection cannot be realized. UTILITY MODEL CONTENTS

[0006] In view of the problems existing in the prior art, the utility model provides a kind of MBR integrated device for assisting PACT purification.

[0007] The utility model discloses a kind of MBR integrated device for assisting PACT purification, with purification, dosing, on-line and off-line backwashing, spray defoaming and the like, by MBR membrane pool 1, backwashing tank 3, air blower 4, storage tube 12, reflux pump 15, water inlet pipe 16, water production pipe 17, spray pipe 19, reflux pipe 20, backwashing pipe 22 and MBR membrane 23 Composition;Water inlet pneumatic valve 14-1 and scale inhibitor dosing device 9 are sequentially arranged on water inlet pipe 16 along water inlet direction;The front end of water production pipe 17 is connected with the water production side of MBR membrane 23, and water production pneumatic valve 14-3 and water production pump 5 are sequentially arranged on water production pipe 17 along water production discharge direction;Water production pipe 17 behind water production pump 5 is divided into two branches, one branch is connected with backwashing tank 3 through pipeline, and backwashing tank water inlet hand valve 21-3 is arranged on the pipeline;Backwashing tank 3 is connected on water production pipe 17 in front of water production pneumatic valve 14-3 through backwashing pipe 22, and backwashing pump 6, acid dosing device 7, alkali dosing device 8 and backwashing pneumatic valve 14-4 are sequentially arranged on backwashing pipe 22 along backwashing water direction;MBR membrane pool emptying valve 21-4 is arranged on the side bottom of MBR membrane pool 1 (the main role of MBR membrane pool emptying valve 21-4 is to drain the sewage in the pool, clean the dirt on the bottom of the pool and replace the internal module);MBR membrane pool static pressure liquid level meter 10-1 is arranged in MBR membrane pool 1, and backwashing tank static pressure liquid level meter 10-2 is arranged in backwashing tank 3, for monitoring the liquid level in MBR membrane pool 1 and backwashing tank 3 respectively;

[0008] MBR membrane 23 is multiple, arranged in MBR membrane pool 1;The water production side of multiple MBR membranes 23 is connected with water production pump 5 through water production pipe 17 (MBR membrane 23 is PVDF material hollow fiber membrane, which is composed of about hundreds of soft membranes with noodle thickness)。Water production pump 5 draws water from the water production side of multiple MBR membranes 23 through water production pipe 17, and leaves suspended solids such as activated carbon powder on the surface of the water inlet side of MBR membrane 23, and the water production filtered by multiple MBR membranes 23 is discharged from the system through water production pipe 17 or enters backwashing tank 3 to complete water replenishment of backwashing tank 3;A certain gap is left between the bottom of MBR membrane 23 and the inner bottom of MBR membrane pool 1;

[0009] The air blower 4 is connected with the front end of the aeration pipe 18 through the aeration pneumatic valve 14-2, the rear end of the aeration pipe 18 is divided into three branches, the first branch is connected with the water production side of the MBR membrane 23 after entering the MBR membrane pool 1; the second branch is arranged between the bottom of the MBR membrane 23 and the bottom of the MBR membrane pool 1 after entering the MBR membrane pool 1, and is used for aerating the gap between the bottom of the plurality of MBR membranes 23 and the inside bottom of the MBR membrane pool 1, preventing the activated carbon mud from depositing on the bottom of the MBR membrane pool 1, and playing a stirring role; the third branch is connected with the water production side of the MBR membrane 23 to be offline backwashed after entering the cleaning pool 2; the air washing pneumatic valve 14-5 is arranged in the first branch, the aeration valve 14-7 is arranged in the second branch, and the offline air washing hand valve 21-2 is arranged in the third branch.

[0010] The scale inhibitor added in the scale inhibitor dosing device 9 is phosphate, and the addition amount is 1-3 mg / L, so that the MBR membrane 23 is prevented from being blocked, and meanwhile, the spray equipment is also prevented from being blocked; the spray pipe 19 is arranged on the water inlet pipe 16 behind the scale inhibitor dosing device 9, a plurality of spray devices 11 are arranged on the spray pipe 19 above the MBR membrane pool 1; the water inlet pneumatic valve 14-1 is opened, so that part of the PACT process treated effluent containing 5000-10000 mg / L of activated carbon powder enters the MBR membrane pool 1 through the water inlet pipe 16, and the other part of the PACT process treated effluent enters the spray device 11 through the spray pipe 19, so that the surface of the PACT process treated effluent in the MBR membrane pool 1 is sprayed and defoamed.

[0011] The receiving pipes 12 are vertically arranged in the MBR membrane pool 1, the water inlet and water outlet flow rates in the MBR membrane pool 1 are adjusted, the receiving pipe openings of the receiving pipes 12 are higher than the water layer surface in the MBR membrane pool 1 by 1-2 cm, and part of the activated sludge (normal reproduction and death of bacteria in the MBR membrane pool 1 to produce activated sludge) carrying the activated carbon powder floating on the water layer surface can enter the receiving pipes and be discharged; the bottoms of the plurality of receiving pipes 12 are connected with the front end of the backflow pipe 20, the backflow pump 15 is arranged at the rear end of the backflow pipe 20; the first receiving pipe hand valve 12-1 and the second receiving pipe hand valve 12-2 and the like are arranged on the receiving pipes 12.

[0012] Further, the MBR integrated device for assisting PACT purification is further provided with the cleaning pool 2, the MBR membrane 23 to be offline backwashed is arranged in the cleaning pool 2, the overflow weir 13 is arranged at the position of the water layer surface on the top of the MBR membrane pool 1, the pipeline provided with the cleaning pool water inlet hand valve 21-1 is arranged behind the overflow weir 13, and the tail end of the pipeline is connected with the water production side of the MBR membrane 23 to be offline backwashed; the offline cleaning receiving pipeline 21 is arranged at the bottom of the cleaning pool 2, the offline cleaning receiving pipeline 21 is connected with the front end of the backflow pipe 20, and the backwashing water drainage valve 14 is arranged on the offline cleaning receiving pipeline 21.

[0013] The on-line chemical cleaning system is composed of the backwash tank 3, the backwash pump 6, the acid dosing device 7, the alkali dosing device 8, the backwash pneumatic valve 14-4, the water production pneumatic valve 14-3, the water production pump 5 and the backwash tank water inlet hand valve 21-3; the aeration system is composed of the air blower 4, the aeration pneumatic valve 14-2 and the aeration pipe 18; and the off-line backwash system is composed of the cleaning tank 2, the overflow weir 13, the cleaning tank water inlet hand valve 21-1, the backwash water outlet valve 14, the off-line cleaning storage pipeline 21 and the off-line air washing hand valve 21-2.

[0014] The operation process of the present application can be divided into a purification treatment operation stage and an on-line cleaning stage.

[0015] The purification treatment operation stage: the aeration pneumatic valve 14-2 is opened, the air blower 4 is started and the aeration amount of the aeration pipe 18 is adjusted by the aeration pneumatic valve 14-2 (so that the oxygen content in the system is in the range of 2-4 mg / L); then the water inlet pneumatic valve 14-1 is opened, and the scale inhibitor dosing device 9 and the backflow pump 15 are started, after the water inflow and backflow are stable, the water production pneumatic valve 14-3, the water production valve 14-6 (provided between the water production pneumatic valve 14-3 and the water production side of the MBR membrane 23, for convenient maintenance) and the water production pump 5 are opened, and other valves and devices are in the closed or stopped state. The solid-liquid separation of the water inflow is realized by the MBR membrane 23 in the MBR membrane tank 1, the activated carbon powder contained in the water inflow is intercepted on the water inflow side of the MBR membrane 23, the water production side of the MBR membrane 23 is provided with a transmembrane power of-0.01 to-0.03 MPa by the water production pump 5, and the purification of the water inflow is completed by the solid-liquid separation of the MBR membrane 23; at the same time, the foam generated on the surface of the water layer in the MBR membrane tank 1 (there are organisms in the system, the organisms also act on the sewage, and the excrement of the organisms may cause the generation of foam) can be sprayed and defoamed by the spraying device 11, so as to prevent the foam from splashing and polluting the surrounding environment of the equipment; the water inflow after the solid-liquid separation in the MBR membrane tank 1 is discharged from the system by the water production pump 5 through the water production pipe 17 or enters the backwash tank 3 as backwash water (the backwash tank water inlet hand valve 21-3 is opened when the backwash tank 3 is replenished with water, and the backwash tank water inlet hand valve 21-3 is closed when the replenishment of water is completed). The spraying area of the spraying device 11 covers the entire MBR membrane tank 1, each branch pipe of the spraying device 11 can be respectively provided with a hand valve (for convenient maintenance, not shown in the figure), and the opening and closing of each spraying device 11 can be adjusted according to the actual needs. Figure 1 The filtered wastewater, activated sludge and activated carbon powder are collected through the storage pipe 12, the bottom of the storage pipe 12 is connected with the backflow pipe 20, and the filtered wastewater, activated carbon powder and activated sludge (the density of the activated carbon powder and the activated sludge is smaller than that of the wastewater) are collectively discharged from the system into the activated carbon regeneration device for treatment by the backflow pump 15.

[0016] The on-line cleaning stage of the MBR membrane 23 includes on-line air cleaning, on-line backwashing and on-line chemical cleaning. When the water production decreases by 20%-30% or the water production side pressure approaches -0.03 MPa, the device stops running and then enters the on-line cleaning process. The specific process is as follows:

[0017] The on-line air cleaning stage: the water production pump 5, the backflow pump 15 and the scale inhibitor dosing device 9 are closed, and then the water production pneumatic valve 14-3 and the water production valve 14-6 are closed. Then the air cleaning pneumatic valve 14-5 is slowly opened and the aeration gas pressure is controlled to be less than 0.03 MPa. Under the driving of the aeration gas at this pressure, the remaining water on the water production side of the MBR membrane 23 is first pressed back to the water inlet side of the MBR membrane 23, which plays a flushing role on the surface of the MBR membrane 23. The aeration gas simultaneously penetrates into the MBR membrane tank 1 from the water production side to the water inlet side of the MBR membrane 23, and relies on the airflow to flush the attached substances and dirt on the water production side and the water inlet side of the MBR membrane 23, so as to achieve the cleaning effect. After 1-3 minutes of air cleaning, the air cleaning pneumatic valve 14-5 is closed, and the on-line air cleaning stage is completed.

[0018] The on-line backwashing stage: the back cleaning pneumatic valve 14-4, the water production valve 14-6 and the backwashing pump 6 are opened, and the water production pneumatic valve 14-3, the water production pump 5 and the back cleaning tank water inlet hand valve 21-3 are closed. The backwashing water from the back cleaning tank 3 is flushed to the MBR membrane 23 from the water production side to the water inlet side through the backwashing pump 6, the back cleaning pipe 22 and the back cleaning pneumatic valve 14-4, and the time is 1-3 minutes. The cleaned water is pressed back to the water inlet side of the MBR membrane 23, so as to complete the on-line backwashing stage.

[0019] The on-line chemical cleaning stage: when the on-line backwashing is performed, the alkali dosing device 8 (sodium hypochlorite aqueous solution with a mass concentration of 1-2% is added in the alkali dosing device 8) is started. The MBR membrane 23 is alkali washed from the water production side to the water inlet side through the backwashing pump 6, the back cleaning pipe 22 and the back cleaning pneumatic valve 14-4 for 1-3 minutes. After the dosing device 8 stops working for 30-40 seconds, the acid dosing device 7 (citric acid aqueous solution with a mass concentration of 1.5-3% is added in the acid dosing device 7) is started to prevent neutralization reaction of the acid and alkali agents. The MBR membrane 23 is acid washed from the water production side to the water inlet side through the backwashing pump 6, the back cleaning pipe 22 and the back cleaning pneumatic valve 14-4 for 1-3 minutes. After the acid dosing device 7 stops working, the backwashing pump 6 continues to run for 30-40 seconds to flush the residual acid solution. Then the backwashing pump 6 and the back cleaning pneumatic valve 14-4 are closed in turn. The cleaned water is pressed back to the water inlet side of the MBR membrane 23, so as to complete the on-line chemical cleaning stage.

[0020] After the on-line cleaning is completed, the system returns to the purification treatment running stage.

[0021] Each MBR membrane 23 set produces water and aeration reserved butt flange, while with the production of water or aeration main pipe between the setting control valve, can realize the off-line cleaning function of single group MBR membrane. The water of the cleaning pool 2 is the production of water in the MBR membrane pool 1, which enters the cleaning pool 2 through the overflow weir 13 and the cleaning pool water inlet hand valve 21-1. The aeration gas inlet pressure is controlled by the off-line gas washing hand valve 21-2 to be less than 0.03Mp, and under the driving of the pressure, the production of water on the production side of the MBR membrane 23 is pressed back to the inlet side, which has a flushing effect on the surface of the MBR membrane 23; The aeration gas simultaneously penetrates the MBR membrane from the production side to the inlet side into the cleaning pool 2, and relies on the airflow to wash the attachments and dirt on the production side and the inlet side of the MBR membrane 23, so as to achieve the cleaning effect, which can ensure the normal operation of the other MBR membranes that are not cleaned when a single group of MBR membranes is off-line cleaned. The water after off-line gas washing is transported to the backflow pipe 20 through the off-line cleaning storage pipeline 21 arranged at the bottom of the cleaning pool 2, and then discharged into the system to the activated carbon regeneration device for treatment.

[0022] The utility model has the advantages and technical effects of:

[0023] 1. The utility model discloses an integrated process device for PACT effluent treatment, which can realize purification of PACT effluent, dosing maintenance of membrane block, online and offline backwashing of membrane block, spraying and defoaming, and carbon powder collection function, and is flexible in application to multiple sites.

[0024] 2. The utility model realizes online cleaning, online chemical cleaning and offline cleaning of MBR membrane, prolongs the service life of MBR membrane, reduces offline cleaning transportation cost, and avoids damage caused by multiple handling.

[0025] 3. The utility model eliminates the foam generated in the biological process of the MBR membrane pool, prevents activated carbon powder from entering the surrounding atmosphere to pollute the environment, and provides multiple spraying devices 11 and controls them separately to realize spraying and defoaming in a specified area or the whole area of the MBR membrane pool.

[0026] 4. The utility model uses equipment inlet water for spraying, adds scale inhibitor to reduce MBR membrane blockage and avoid clogging of the spraying equipment; since the spraying water finally enters the MBR membrane pool, it does not affect the treatment capacity of the equipment; the pressure required by the spraying equipment is completely provided by the water pressure, so that the design is more economical and efficient.

[0027] 5. The utility model discloses a storage tube, storage tube connects backflow pipe, the storage tube mouth of storage tube 12 is higher than the water layer surface in MBR membrane pool 1 1~2cm, mainly collects the higher concentration of activated carbon powder and a part of activated sludge in this area, under the action of backflow pump, the activated carbon powder is transported to the regeneration system through the storage tube, and the recovery efficiency of activated carbon powder is improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is the device structure schematic view that the utility model discloses;

[0029] Among them, the component names are: MBR membrane pool 1, cleaning pool 2, backwashing tank 3, air blower 4, water production pump 5, backwashing pump 6, acid dosing device 7, alkali dosing device 8, scale inhibitor dosing device 9, MBR membrane pool static pressure liquid level meter 10-1, backwashing tank static pressure liquid level meter 10-2, spraying device 11, storage tube 12, first storage tube hand valve 12-1, second storage tube hand valve 12-2, overflow weir 13, backwashing drain valve 14, water inlet pneumatic valve 14-1, aeration pneumatic valve 14-2, water production pneumatic valve 14-3, backwashing pneumatic valve 14-4, air washing pneumatic valve 14-5, water production valve 14-6, aeration valve 14-7, backflow pump 15, water inlet pipe 16, water production pipe 17, aeration pipe 18, spraying pipe 19, backflow pipe 20, offline cleaning storage pipeline 21, cleaning pool water inlet hand valve 21-1, offline air washing hand valve 21-2, backwashing tank water inlet hand valve 21-3, MBR membrane pool emptying valve 21-4, backwashing pipe 22. DETAILED DESCRIPTION

[0030] In order to make the utility model's purpose, technical scheme and advantage more clearly, the following is with example, to the utility model is further detailedly explained. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0031] Example 1

[0032] A kind of MBR integrated device for assisting PACT purification, including water inlet pneumatic valve 14-1, water inlet pipeline 16, MBR membrane pool 1, scale inhibitor dosing equipment 9, water inlet pipeline 16 connects MBR membrane pool 1, while setting up spraying pipe 19 connects spraying defoaming equipment 11;MBR membrane in MBR membrane pool 1 is connected with water production pump 5 by water production pipeline 17, and the material after reaching standard is discharged to the outside by water production pneumatic valve 14-3, water production pump 5, water production pipe 17;

[0033] Spraying device 11, spraying area covers entire MBR membrane pool 1, and each branch pipe of spraying device 11 is provided with hand valve, and spraying area is adjusted according to actual needs;

[0034] The backflow pipeline adopts upper end backflow, is collected through the storage pipe 12, the storage pipe is connected with the backflow pipe 21, the backflow pipe is connected with the backflow pump 15, and the activated carbon powder and the activated sludge are backflowed to the previous treatment unit.

[0035] Each membrane block set produces water and aeration and is provided with a control valve between a reserved butt flange of the water production or aeration main pipe, so that the off-line cleaning function of a single MBR membrane can be realized, a cleaning water tank 2 is arranged, the water tank uses the water from the overflow weir 13 of the MBR membrane pool as water, the water amount is controlled through the water inlet hand valve 21-1 of the cleaning pool, and the air inlet amount is controlled through the off-line air washing hand valve 21-2, so that the MBR membrane is gas washed, and thus the normal operation of the MBR membrane which is not cleaned can be ensured when a single MBR membrane is off-line cleaned; in addition, a backwashing system is arranged, an acid and medicine adding system 7 and an alkali and medicine adding system 8 are arranged on the backwashing pipeline 21, and the on-line chemical cleaning function and the MBR backwashing operation can be realized through the control of the PLC control system, so that the operation condition, backwashing requirement and on-line chemical cleaning function of different MBR membrane systems can be adapted.

[0036] The utility model discloses to the PACT treatment system tail water purification and activated carbon powder separation of a chemical plant, and the water quality is as shown in table 1:

[0037] Table 1: Water quality data

[0038] Serial number Name Unit Value 1 COD mg / L ≤2000 2 Suspended solids mg / L ≤9500 3 Alkalinity mg / L ≤2450 4 Conductivity ms / cm ≤6.00 5 Ammonia nitrogen mg / L ≤5 6 Total nitrogen mg / L ≤9 7 Total phosphorus mg / L ≤5 8 pH None 7-9

[0039] Through the purification treatment of the device, the suspended solids of effluent are ≤5mg / L, the COD is reduced from 2000mg / L to 500mg / L, and the effluent discharged from the effluent pipe 17 meets the production recycling requirements of the plant area.

[0040] The high COD content of the incoming water is the main reason for generating a large number of bubbles during aeration, and the suspended solids are mainly activated carbon powder, the incoming water enters the MBR membrane pool through the water inlet pipe, and the spraying device is started at the same time to eliminate bubbles. The incoming water is separated by the MBR membrane after fully reacting in the MBR pool, and the effluent is transported to the designated area by the effluent pump through the effluent pipeline.

[0041] The continuous aeration of the MBR membrane pool causes the enrichment of activated carbon powder in the upper layer of the membrane pool, and the content of activated carbon powder in the upper layer is more than 20% higher than that in the bottom area. Under the action of the storage pipe, the activated carbon powder with high concentration enters the backflow pipe and is transported to the activated carbon powder regeneration system by the backflow pump.

[0042] In order to ensure the flux of the MBR membrane, the MBR membrane is subjected to on-line air washing, chemical cleaning and backwashing through PLC control at regular intervals, and after a long time of operation, the MBR membranes are subjected to off-line cleaning one by one, so that the whole device can be stably operated.

[0043] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An integrated MBR device for assisting PACT purification, characterized in that: It consists of an MBR membrane tank (1), a backwash tank (3), a blower (4), a receiving pipe (12), a return pump (15), an inlet pipe (16), a product water pipe (17), a spray pipe (19), a return pipe (20), a backwash pipe (22), and an MBR membrane (23). An inlet pneumatic valve (14-1) and a scale inhibitor dosing device (9) are sequentially installed on the inlet pipe (16) along the inlet direction. The front end of the product water pipe (17) is connected to the product water side of the MBR membrane (23). A product water pneumatic valve (14-3) and a product water pump (5) are sequentially installed on the product water pipe (17) along the product water discharge direction. The product water pipe (17) after the product water pump (5) is divided into two branches. One branch is connected to the backwash tank (23) through a pipeline. The cleaning tank (3) is connected, and a backwash tank inlet hand valve (21-3) is installed on the pipeline; the backwash tank (3) is connected to the product water pipe (17) in front of the product water pneumatic valve (14-3) through the backwash pipe (22), and a backwash pump (6), an acid dosing device (7), an alkali dosing device (8) and a backwash pneumatic valve (14-4) are installed in sequence on the backwash pipe (22) along the backwash water direction; an MBR membrane tank drain valve (21-4) is installed at the bottom of the side of the MBR membrane tank (1); the spray pipe (19) is installed on the inlet pipe (16) after the scale inhibitor dosing device (9), and multiple spray devices (11) are installed on the spray pipe (19) above the MBR membrane tank (1); There are multiple MBR membranes (23) arranged inside the MBR membrane tank (1); there is a gap between the bottom of the MBR membrane (23) and the bottom of the inner side of the MBR membrane tank (1); The blower (4) is connected to the front end of the aeration pipe (18) through the aeration pneumatic valve (14-2). The rear end of the aeration pipe (18) is divided into three branches. The first branch enters the MBR membrane tank (1) and is connected to the permeate side of the MBR membrane (23). The second branch enters the MBR membrane tank (1) and is located between the bottom of the MBR membrane (23) and the bottom of the MBR membrane tank (1). There are multiple receiving pipes (12), which are vertically installed in the MBR membrane tank (1). The receiving pipe opening of the receiving pipe (12) is 1~2cm higher than the surface of the water layer in the MBR membrane tank (1). The bottom of the multiple receiving pipes (12) is connected to the front end of the return pipe (20), and a return pump (15) is installed at the rear end of the return pipe (20).

2. The integrated MBR device for assisting PACT purification as described in claim 1, characterized in that: A cleaning tank (2) is provided. An overflow weir (13) is provided at the top water surface of the MBR membrane tank (1). A pipeline with a cleaning tank inlet hand valve (21-1) is provided behind the overflow weir (13). The end of the pipeline is connected to the permeate side of the MBR membrane (23) to be backwashed offline. An offline cleaning collection pipe (21) is provided at the bottom of the cleaning tank (2). The cleaning collection pipe (21) is connected to the front end of the return pipe (20). A backwash drain valve (14) is provided on the offline cleaning collection pipe (21). The third branch of the aeration pipe (18) enters the cleaning tank (2) and is connected to the permeate side of the MBR membrane (23) to be backwashed offline.

3. The integrated MBR device for assisting PACT purification as described in claim 2, characterized in that: An air-washing pneumatic valve (14-5) is installed in the first branch at the rear end of the aeration pipe (18), an aeration valve (14-7) is installed in the second branch at the rear end of the aeration pipe (18), and an offline air-washing valve (21-2) is installed in the third branch at the rear end of the aeration pipe (18).

4. The integrated MBR device for assisting PACT purification as described in claim 1, characterized in that: A first storage tube manual valve (12-1) and a second storage tube manual valve (12-2) are provided on multiple storage tubes (12).

5. An integrated MBR device for assisting PACT purification as described in claim 1, characterized in that: An MBR membrane tank static pressure level gauge (10-1) is installed in the MBR membrane tank (1), and a backwash tank static pressure level gauge (10-2) is installed in the backwash tank (3).

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