CN113321371A

CN113321371A - To STREAMING MBR effluent treatment plant

Info

Publication number: CN113321371A
Application number: CN202110445538.3A
Authority: CN
Inventors: 郭亚辉; 姚阔; 吴亚婷; 王旭
Original assignee: Beijing Shuiyan Environmental Technology Co ltd
Current assignee: Beijing Shuiyan Environmental Technology Co ltd
Priority date: 2021-04-23
Filing date: 2021-04-23
Publication date: 2021-08-31

Abstract

The invention relates to the technical field of wastewater treatment, in particular to a convection type MBR wastewater treatment device, which comprises a fixed base, wherein a filter tank, a biochemical tank, an MBR tank and a clean water tank are sequentially arranged on the surface of the fixed base from left to right, an MBR membrane module is arranged in the MBR tank, a frame-shaped pipe is arranged at a position close to the bottom in the MBR tank, a medicament box and a third water pump are arranged at a position between the MBR tank and the clean water tank on the surface of the fixed base, a metering pump is arranged at a position close to the lower left corner at the top of the medicament box, and a second water pump is arranged at a position close to the rear side at the top of the medicament box. This to STREAMING MBR effluent treatment plant, through the water input frame venturi tube in second water pump will clear water pond, break up the silt of MBR bottom of the pool, help forming great zoogloea, improve the nitration ability of system, reduce the output of silt to the discharge of the silt of being convenient for plays support and fixed effect to the MBR membrane module through the backup pad, thereby convenient to use person clears up or changes the MBR membrane module.

Description

To STREAMING MBR effluent treatment plant

Technical Field

The invention relates to the technical field of wastewater treatment, in particular to a convection type MBR wastewater treatment device.

Background

Along with the continuous growth of population, water resources are more and more scarce, a large amount of waste water is generated at the same time, the waste water can cause environmental pollution without being treated and discharged, therefore, the waste water generated in daily life can be discharged after being treated by a waste water treatment device, the waste water treatment is to treat the waste water by using physical, chemical and biological methods, so that the waste water is purified and the pollution is reduced, so as to achieve the purposes of waste water recovery and reuse, one common mode of the modern waste water treatment is MBR (membrane bioreactor) waste water treatment, but the sludge is easy to deposit at the bottom of an MBR pool and is inconvenient to discharge, so that adverse effects are caused to an MBR membrane of the MBR pool, and the deposited sludge is not beneficial to forming a zoogloea, so that the sludge yield is larger.

Disclosure of Invention

The invention aims to provide a convection type MBR wastewater treatment device, and aims to solve the problems that sludge is easy to deposit at the bottom of an MBR tank and is inconvenient to discharge in the wastewater treatment process of the conventional MBR wastewater treatment device in the background art, the MBR membrane in the MBR tank is adversely affected, and the deposited sludge is not beneficial to forming zoogloea, so that the sludge yield is high.

In order to achieve the purpose, the invention provides the following technical scheme:

a convection type MBR wastewater treatment device comprises a fixed base, wherein a filter tank, a biochemical tank, an MBR tank and a clean water tank are sequentially arranged on the surface of the fixed base from left to right, a wastewater input pipe is arranged at the rear side of the filter tank and at the position close to the top, an L-shaped filter plate is arranged at the left side of the inner wall of the filter tank and at the position close to the top, a first water pump is arranged on the surface of the fixed base and at the position between the filter tank and the biochemical tank, the input end of the first water pump is connected with a first water pumping pipe, the water inlet end of the first water pumping pipe is arranged in the filter tank, the output end of the first water pump is connected with a first water supply pipe, the water outlet end of the first water supply pipe is arranged in the MBR tank, a sludge pump is arranged on the surface of the fixed base and at the position between the biochemical tank and the MBR tank, the input end of the sludge pump is connected with a sludge pumping pipe, and the end of the sludge pumping pipe is arranged in the MBR tank, the sludge pump comprises a sludge pump body, a sludge conveying pipe, a biochemical tank, an MBR membrane assembly, a plurality of MBR membranes, a plurality of through holes, a chemical tank, a third water pump, a metering pump, a chemical pumping pipe, a chemical tank, a third water pump, a chemical tank, a chemical delivery pipe and a chemical delivery pipe, wherein the sludge pump body is connected with the output end of the sludge pump body, the end part of the sludge conveying pipe is positioned in the biochemical tank, the MBR membrane assembly is arranged in the MBR tank and consists of an MBR membrane frame and a plurality of MBR membranes, two water production ends at the top of the MBR membrane assembly are both connected with water production pipes, the end parts of the two water production pipes are connected with a first connecting three-way pipe, a frame-shaped pipe is arranged at a position close to the bottom in the MBR tank, a plurality of through holes which are arranged at equal intervals are arranged at the bottom of the outer wall of the frame-shaped pipe, the chemical tank and a third water pump are arranged on the surface of the fixed base and positioned between the MBR tank and the clean water tank, the top of the chemical tank and the lower corner of the left corner of the chemical tank, the metering pump is connected with the chemical delivery pipe, the outer wall of medicine conveying pipe is equipped with the control valve, the top of medicament case and the position that is close to the rear side are equipped with the second water pump, the input of second water pump is connected with the second drinking-water pipe, the tip of second drinking-water pipe is located the clear water pond, the output of second water pump is connected with the second delivery pipe, the second delivery pipe through the second connect the three-way pipe with medicine conveying pipe intercommunication, the tip of second delivery pipe with frame venturi tube intercommunication, the input of third water pump is connected with the third drinking-water pipe, the tip of third drinking-water pipe with first connection three-way pipe intercommunication, the output of third water pump is connected with the third delivery pipe, the tip of third delivery pipe is located the clear water pond.

Preferably, the end of the wastewater input pipe is located near the top of the left side of the vertical plate of the L-shaped filter plate.

Preferably, a liquid discharge pipe is arranged on the front side of the MBR tank and at a position close to the lower left corner, and a drain valve is arranged on the outer wall of the liquid discharge pipe.

Preferably, the end of the first pumping pipe is positioned near the bottom of the inner wall of the filter tank.

Preferably, the end of the mud pumping pipe is positioned below the frame-shaped pipe.

Preferably, the end of the second pumping pipe is located near the bottom of the inner wall of the clean water tank.

Preferably, the outer wall of the frame-shaped pipe is horizontally provided with four connecting rods which are arranged at equal intervals, and the end parts of the connecting rods are welded with the inner wall of the MBR tank.

Preferably, a support column is arranged in the middle of the bottom of the inner wall of the MBR tank, a support plate is arranged at the top end of the support column, a positioning groove is formed in the top of the support plate, and the bottom of the MBR membrane module is located in the positioning groove.

Preferably, the bottom of the inner wall of the positioning groove is of a hollow structure.

Preferably, a medicine injection pipe is arranged at the top of the medicine box and close to the lower right corner, and a sealing cover is in threaded connection with the end part of the medicine injection pipe.

Compared with the prior art, the invention has the beneficial effects that:

1. this to STREAMING MBR effluent treatment plant can carry out preliminary filtration to the waste water of input through the filtering ponds, filters the large granule thing impurity in the waste water, avoids big particulate matter impurity to enter into the MBR pond in, is favorable to the MBR membrane module to the processing of waste water in the MBR pond, reduces abluent frequency to it is long when improving the use of MBR membrane module.

2. This to STREAMING MBR effluent treatment plant, through the water input frame venturi tube in second water pump will clear water pond, break away the silt of MBR bottom of the pool, help forming great zoogloea, improve the nitration ability of system, reduce the output of silt to the discharge of the silt of being convenient for.

3. This to STREAMING MBR effluent treatment plant, the sodium hypochlorite solution of injecting certain concentration in the medicament case to through measuring pump and second water pump make sodium hypochlorite solution along with rivers input to the MBR pond in, carry out the disinfection and isolation processing to the MBR pond.

4. This to STREAMING MBR effluent treatment plant plays support and fixed effect to the MBR membrane module through support column and backup pad, and convenient to use person takes out the MBR membrane module to convenient to use person clears up or changes the MBR membrane module.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic diagram of a portion of the structure of the present invention;

FIG. 3 is a schematic view of a support pillar structure according to the present invention;

FIG. 4 is a schematic view showing an assembling structure of a frame-shaped pipe and a second water feeding pipe according to the present invention;

FIG. 5 is a second partial schematic view of the present invention.

In the figure: the device comprises a fixed base 1, a filter tank 2, an L-shaped filter plate 20, a wastewater input pipe 21, a biochemical tank 3, an MBR tank 4, a support column 40, a support plate 400, a positioning groove 4000, a liquid discharge pipe 41, a clean water tank 5, a first water pump 6, a first water pumping pipe 60, a first water supply pipe 61, a sludge pump 7, a sludge pumping pipe 70, a sludge conveying pipe 71, an MBR membrane module 8, a water production pipe 80, a medicament box 9, a second water pump 10, a second water pumping pipe 100, a second water supply pipe 101, a metering pump 11, a medicament pumping pipe 110, a medicament conveying pipe 111, a control valve 1110, a third water pump 12, a third water pumping pipe 120, a third water supply pipe 121, a first connecting three-way pipe 13, a second connecting three-way pipe 14, a frame pipe 15, a through hole 150 and a connecting rod 151.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", "third" may explicitly or implicitly include one or more of the features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 1-5, the present invention provides a technical solution:

example 1

The invention relates to a convection type MBR wastewater treatment device, which comprises a fixed base 1, wherein a filter tank 2, a biochemical tank 3, an MBR tank 4 and a clean water tank 5 are sequentially arranged on the surface of the fixed base 1 from left to right, a wastewater input pipe 21 is arranged at the rear side of the filter tank 2 and at a position close to the top, an L-shaped filter plate 20 is arranged at the left side of the inner wall of the filter tank 2 and at a position close to the top and is used for filtering large particulate impurities in wastewater to prevent the large particulate impurities from entering the MBR tank 4 and then rapidly blocking an MBR membrane, so that the service life of an MBR membrane assembly 8 is prolonged, a first water pump 6 is arranged on the surface of the fixed base 1 and at a position between the filter tank 2 and the biochemical tank 3, the input end of the first water pump 6 is connected with a first water pumping pipe 60, the water inlet end of the first water pumping pipe 60 is arranged in the filter tank 2, the output end of the first water pump 6 is connected with a first water supply pipe 61, the water outlet end of the first water supply pipe 61 is arranged in the MBR tank 4, inputting filtered wastewater into an MBR tank 4 through a first water pump 6, arranging a sludge pump 7 on the surface of a fixed base 1 and at a position between a biochemical tank 3 and the MBR tank 4, connecting a sludge pumping pipe 70 to the input end of the sludge pump 7, connecting the end part of the sludge pumping pipe 70 to the MBR tank 4, connecting a sludge conveying pipe 71 to the output end of the sludge pump 7, connecting the end part of the sludge conveying pipe 71 to the biochemical tank 3, sucking out sludge in the MBR tank 4 through the sludge pump 7 and inputting the sludge into the biochemical tank 3, arranging an MBR membrane assembly 8 in the MBR tank 4, wherein the MBR membrane assembly 8 consists of an MBR membrane frame and a plurality of MBR membranes, connecting water-producing pipes 80 to two water-producing ends at the top of the MBR membrane assembly 8, connecting the end parts of the two water-producing pipes 80 together with a first connecting three-way pipe 13, arranging a frame-shaped pipe 15 at a position in the MBR tank 4 and close to the bottom, arranging a plurality of through holes 150 arranged at equal intervals at the bottom of the outer wall of the frame-shaped pipe 15, the water is sprayed out from the bottom of the frame pipe 15 to disperse the sludge, a chemical box 9 and a third water pump 12 are arranged on the surface of the fixed base 1 and between the MBR tank 4 and the clean water tank 5, a metering pump 11 is arranged on the top of the chemical box 9 and near the lower left corner, the input end of the metering pump 11 is connected with a chemical pumping pipe 110, the end of the chemical pumping pipe 110 passes through the left side of the chemical box 9 to a position near the bottom of the inner wall of the chemical box 9, the output end of the metering pump 11 is connected with a chemical delivery pipe 111, the outer wall of the chemical delivery pipe 111 is provided with a control valve 1110 to facilitate control the opening and closing of the chemical delivery pipe 111, when the sludge is dispersed, the chemical delivery pipe 111 does not need to be delivered into the MBR tank 4, at the moment, the chemical delivery pipe 111 needs to be closed, a second water pump 10 is arranged on the top of the chemical box 9 and near the rear side, the input end of the second water pump 10 is connected with a second water pumping pipe 100, the end of the second water pumping pipe 100 is positioned in the clean water tank 5, the output end of the second water pump 10 is connected with a second water supply pipe 101, the second water supply pipe 101 is communicated with the medicine conveying pipe 111 through a second connecting three-way pipe 14, so that the medicine can be conveyed into the second water supply pipe 101 through the medicine conveying pipe 111 and enters the MBR tank 4 along with water flow, the end part of the second water supply pipe 101 is communicated with the frame pipe 15, the input end of the third water pump 12 is connected with a third water pumping pipe 120, the end part of the third water pumping pipe 120 is communicated with the first connecting three-way pipe 13 to convey the produced water of the MBR 8 into the clean water tank 5, the output end of the third water pump 12 is connected with a third water supply pipe 121, and the end part of the third water supply pipe 121 is located in the clean water tank 5.

Example 2

In the above-mentioned scheme, the tip of waste water input tube 21 is located the position that is close to the vertical board left side top of L shape filter 20, ensures that waste water is whole to be filtered through L shape filter 20, avoids having the bottom that large granule thing impurity enters into filtering ponds 2.

Example 3

In the above scheme, the front side of the MBR tank 4 and the position close to the lower left corner are provided with the liquid discharge pipe 41, and the outer wall of the liquid discharge pipe 41 is provided with the drain valve for discharging the agent solution cleaned in the MBR tank 4.

Example 4

The invention relates to a convection type MBR wastewater treatment device, which comprises a fixed base 1, wherein a filter tank 2, a biochemical tank 3, an MBR tank 4 and a clean water tank 5 are sequentially arranged on the surface of the fixed base 1 from left to right, a wastewater input pipe 21 is arranged at the rear side of the filter tank 2 and at a position close to the top, an L-shaped filter plate 20 is arranged at the left side of the inner wall of the filter tank 2 and at a position close to the top and is used for filtering large particulate impurities in wastewater to prevent the large particulate impurities from entering the MBR tank 4 and then rapidly blocking an MBR membrane, so that the service life of an MBR membrane assembly 8 is prolonged, a first water pump 6 is arranged on the surface of the fixed base 1 and at a position between the filter tank 2 and the biochemical tank 3, the input end of the first water pump 6 is connected with a first water pumping pipe 60, the water inlet end of the first water pumping pipe 60 is arranged in the filter tank 2, the output end of the first water pump 6 is connected with a first water supply pipe 61, the water outlet end of the first water supply pipe 61 is arranged in the MBR tank 4, inputting filtered wastewater into an MBR tank 4 through a first water pump 6, arranging a sludge pump 7 on the surface of a fixed base 1 and at a position between a biochemical tank 3 and the MBR tank 4, connecting a sludge pumping pipe 70 to the input end of the sludge pump 7, connecting the end part of the sludge pumping pipe 70 to the MBR tank 4, connecting a sludge conveying pipe 71 to the output end of the sludge pump 7, connecting the end part of the sludge conveying pipe 71 to the biochemical tank 3, sucking out sludge in the MBR tank 4 through the sludge pump 7 and inputting the sludge into the biochemical tank 3, arranging an MBR membrane assembly 8 in the MBR tank 4, wherein the MBR membrane assembly 8 consists of an MBR membrane frame and a plurality of MBR membranes, connecting water-producing pipes 80 to two water-producing ends at the top of the MBR membrane assembly 8, connecting the end parts of the two water-producing pipes 80 together with a first connecting three-way pipe 13, arranging a frame-shaped pipe 15 at a position in the MBR tank 4 and close to the bottom, arranging a plurality of through holes 150 arranged at equal intervals at the bottom of the outer wall of the frame-shaped pipe 15, the water is sprayed out from the bottom of the frame pipe 15 to disperse the sludge, a chemical box 9 and a third water pump 12 are arranged on the surface of the fixed base 1 and between the MBR tank 4 and the clean water tank 5, a metering pump 11 is arranged on the top of the chemical box 9 and near the lower left corner, the input end of the metering pump 11 is connected with a chemical pumping pipe 110, the end of the chemical pumping pipe 110 passes through the left side of the chemical box 9 to a position near the bottom of the inner wall of the chemical box 9, the output end of the metering pump 11 is connected with a chemical delivery pipe 111, the outer wall of the chemical delivery pipe 111 is provided with a control valve 1110 to facilitate control the opening and closing of the chemical delivery pipe 111, when the sludge is dispersed, the chemical delivery pipe 111 does not need to be delivered into the MBR tank 4, at the moment, the chemical delivery pipe 111 needs to be closed, a second water pump 10 is arranged on the top of the chemical box 9 and near the rear side, the input end of the second water, the output end of the second water pump 10 is connected with a second water supply pipe 101, the second water supply pipe 101 is communicated with the medicine conveying pipe 111 through a second connecting three-way pipe 14, so that the medicine can be conveyed into the second water supply pipe 101 through the medicine conveying pipe 111 and enters the MBR tank 4 along with water flow, the end part of the second water supply pipe 101 is communicated with the frame pipe 15, the input end of the third water pump 12 is connected with a third water pumping pipe 120, the end part of the third water pumping pipe 120 is communicated with the first connecting three-way pipe 13 to convey the produced water of the MBR 8 into the clean water tank 5, the output end of the third water pump 12 is connected with a third water supply pipe 121, and the end part of the third water supply pipe 121 is located in the clean water tank 5.

In the above scheme, the end of the first pumping pipe 60 is located near the bottom of the inner wall of the filtering tank 2, so that the water at the bottom of the filtering tank 2 is completely delivered into the MBR tank 4.

Further, the end of the sludge pumping pipe 70 is positioned below the frame-shaped pipe 15, so that the sludge pumping pipe 70 can suck out sludge at the bottom of the MBR tank 4.

Further, the end of the second pumping pipe 100 is located near the bottom of the inner wall of the clean water tank 5, preferably, the water at the bottom of the clean water tank 5 is used, and the water at the top of the clean water tank 5 can be directly discharged as clean water.

Example 5

In the above scheme, the outer wall of the frame-shaped pipe 15 is horizontally provided with four connecting rods 151 arranged at equal intervals, and the end parts of the connecting rods 151 are welded with the inner wall of the MBR tank 4, so that the position of the frame-shaped pipe 15 is fixed.

Example 6

In the above scheme, the middle part of the bottom of the inner wall of the MBR tank 4 is provided with the support column 40, the top end of the support column 40 is provided with the support plate 400, the top of the support plate 400 is provided with the positioning groove 4000, and the bottom of the MBR membrane module 8 is positioned in the positioning groove 4000 to support and fix the MBR membrane module 8.

Furthermore, the bottom of the inner wall of the positioning groove 4000 is of a hollow structure, so that sludge is prevented from being deposited in the positioning groove 4000.

Example 7

In the above scheme, the top of chemical tank 9 and the position that is close to the lower right corner are equipped with the injection pipe, and the tip threaded connection of injection pipe has sealed lid, and convenient to use person injects sodium hypochlorite solution into chemical tank 9.

When the convection type MBR wastewater treatment equipment is used, a user inputs wastewater into the filter tank 2 from the wastewater input pipe 21, the wastewater filtered by the L-shaped filter plate 20 is conveyed into the MBR tank 4 through the first water pump 6, at the moment, the wastewater is treated by the MBR membrane module 8, and the produced water of the MBR membrane module 8 is conveyed into the clean water tank 5 through the third water pump 12, so that the wastewater treatment is completed; when the MBR membrane module 8 works, the second water pump 10 conveys water in the clean water tank 5 to the frame-shaped pipe 15 to disperse sludge at the bottom of the MBR tank 4, which is beneficial to forming larger zoogloea, improving the nitrification capability of the system and reducing the yield of the sludge, thereby facilitating the discharge of the sludge; when needing to disinfect to MBR pond 4, the user opens control valve 1110 to start second water pump 10 and measuring pump 11, make the sodium hypochlorite solution in the medicine case 9 get into MBR pond 4 along with rivers, disinfect the disinfection to MBR pond 4, after the completion, open the drain valve of fluid-discharge tube 41 can.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a STREAMING MBR effluent treatment plant which characterized in that: comprises a fixed base (1), the surface of the fixed base (1) is sequentially provided with a filtering tank (2), a biochemical tank (3), an MBR tank (4) and a clean water tank (5) from left to right, the rear side of the filtering tank (2) and the position close to the top are provided with a waste water input pipe (21), the left side of the inner wall of the filtering tank (2) and the position close to the top are provided with an L-shaped filtering plate (20), the surface of the fixed base (1) and the position between the filtering tank (2) and the biochemical tank (3) are provided with a first water pump (6), the input end of the first water pump (6) is connected with a first water pumping pipe (60), the water inlet end of the first water pumping pipe (60) is positioned in the filtering tank (2), the output end of the first water pump (6) is connected with a first water supply pipe (61), the water outlet end of the first water supply pipe (61) is positioned in the MBR tank (4), the device comprises a fixed base (1), a sludge pump (7) is arranged on the surface of the fixed base and at a position between a biochemical tank (3) and an MBR tank (4), the input end of the sludge pump (7) is connected with a sludge pumping pipe (70), the end part of the sludge pumping pipe (70) is positioned in the MBR tank (4), the output end of the sludge pump (7) is connected with a sludge conveying pipe (71), the end part of the sludge conveying pipe (71) is positioned in the biochemical tank (3), an MBR (8) is arranged in the MBR tank (4), the MBR membrane module (8) is composed of an MBR membrane frame and a plurality of MBR membranes, two water production ends at the top of the MBR membrane module (8) are both connected with water production pipes (80), the end parts of the two water production pipes (80) are both connected with a first connecting three-way pipe (13), a frame-shaped pipe (15) is arranged at a position close to the bottom in the MBR tank (4), a plurality of through holes (150) which are arranged at equal intervals are arranged at the bottom of the outer wall of the frame-shaped pipe (15), the utility model discloses a sewage treatment device, including unable adjustment base (1), MBR pond (4), clean water basin (5), the position on the surface of unable adjustment base (1) just is located between MBR pond (4) and clean water basin (5) is equipped with medicament case (9) and third water pump (12), the top of medicament case (9) and the position that is close to the lower left corner are equipped with measuring pump (11), the input of measuring pump (11) is connected with drug delivery pipe (110), the tip of drug delivery pipe (110) passes the left side of medicament case (9) to being close to the position of medicament case (9) inner wall bottom, the output of measuring pump (11) is connected with drug delivery pipe (111), the outer wall of drug delivery pipe (111) is equipped with control valve (1110), the position that the top of medicament case (9) and be close to the rear side is equipped with second water pump (10), the input of second water pump (10) is connected with second water pumping pipe (100), the tip of second water pumping pipe (100) is located clean water basin (5), the output of second water pump (10) is connected with second flow pipe (101), second flow pipe (101) through the second connect three-way pipe (14) with defeated pencil (111) intercommunication, the tip of second flow pipe (101) with frame venturi tube (15) intercommunication, the input of third water pump (12) is connected with third drinking-water pipe (120), the tip of third drinking-water pipe (120) with first connect three-way pipe (13) intercommunication, the output of third water pump (12) is connected with third flow pipe (121), the tip of third flow pipe (121) is located in clean water basin (5).

2. A convective MBR wastewater treatment plant according to claim 1, characterized in that: the end of the waste water input pipe (21) is positioned close to the top of the left side of the vertical plate of the L-shaped filter plate (20).

3. A convective MBR wastewater treatment plant according to claim 1, characterized in that: a liquid discharge pipe (41) is arranged on the front side of the MBR tank (4) and at a position close to the lower left corner, and a drain valve is arranged on the outer wall of the liquid discharge pipe (41).

4. A convective MBR wastewater treatment plant according to claim 1, characterized in that: the end part of the first water pumping pipe (60) is positioned at a position close to the bottom of the inner wall of the filter tank (2).

5. A convective MBR wastewater treatment plant according to claim 1, characterized in that: the end part of the mud pumping pipe (70) is positioned below the frame-shaped pipe (15).

6. A convective MBR wastewater treatment plant according to claim 1, characterized in that: the end part of the second water pumping pipe (100) is positioned at the position close to the bottom of the inner wall of the clean water tank (5).

7. A convective MBR wastewater treatment plant according to claim 1, characterized in that: the outer wall level of frame venturi tube (15) is equipped with four connecting rods (151) of equidistant arranging, just the tip of connecting rod (151) with the inner wall welding of MBR pond (4).

8. A convective MBR wastewater treatment plant according to claim 1, characterized in that: the middle part of MBR pond (4) inner wall bottom is equipped with support column (40), the top of support column (40) is equipped with backup pad (400), constant head tank (4000) have been seted up at the top of backup pad (400), the bottom of MBR membrane module (8) is located in constant head tank (4000).

9. A convective MBR wastewater treatment plant according to claim 8, characterized in that: the bottom of the inner wall of the positioning groove (4000) is of a hollow structure.

10. A convective MBR wastewater treatment plant according to claim 1, characterized in that: the top of the chemical box (9) is provided with a chemical injection tube at a position close to the lower right corner, and the end part of the chemical injection tube is in threaded connection with a sealing cover.