MBR membrane tank and sewage treatment system

Abstract

The utility model belongs to the technical field of sewage treatment, and discloses an MBR (Membrane Biological Reactor) membrane tank which comprises a tank body, a membrane component and at least two baffles, an aeration element is arranged in the membrane component, and the baffles are used for dividing the tank body into a sludge rising area and a sludge settling area; the membrane component is arranged in the sludge rising area, and the aeration element is positioned below the membrane component; under the pushing of the aeration element, the sludge can cross the baffle plate from the sludge settling area to enter the sludge settling area; and the tank body is also provided with a discharge pipe for outputting sludge deposited at the bottom of the tank body. Meanwhile, the utility model also discloses a sewage treatment system with the MBR membrane tank. By adding the baffle, the tank body is divided into the sludge rising area and the sludge settling area which are open at the upper end and the lower end through the baffle, under the pushing of the aeration element, water flow surrounds the baffle to form circulation, sludge in the sludge rising area is promoted to cross the baffle to enter the sludge settling area, sludge precipitation is promoted, and the burden of the membrane module is relieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sewage treatment technical field, concretely is a kind of MBR membrane pool and sewage treatment system. BACKGROUND

[0002] Membrane bioreactor (MBR, Membrane Bioreactor) is a kind of sewage treatment system combined with membrane separation technology and biological treatment process.MBR membrane pool is widely applied in modern sewage treatment field, and is favored due to its efficient sewage treatment effect and the superiority of effluent quality.

[0003] CN215516814U discloses a small MBR membrane pool convenient for dredging, including filter tank, sewage inlet pipe, outlet pipe, MBR membrane assembly arranged in filter tank, MBR membrane assembly includes a plurality of MBR membrane elements, aeration pipe is arranged below MBR membrane assembly, sludge backflow collecting pipe is also arranged below MBR membrane assembly, sludge backflow collecting pipe is located below aeration pipe and is arranged intersecting with aeration pipe, one end extends out of filter tank for being connected with external suction pump, a plurality of through holes are formed on the pipe wall of sludge backflow collecting pipe, one inclined plate is arranged on the both sides of MBR membrane assembly respectively, the lower end of inclined plate is fixed to the bottom surface in filter tank, the distance between the lower ends of two inclined plates is less than the distance between the upper ends of two inclined plates, aeration pipe and sludge backflow collecting pipe are both located between two inclined plates.

[0004] The above technical scheme sets inclined plate on the both sides of MBR membrane assembly, so that the sludge sinking is gathered to the bottom of pool along inclined plate, and then the sludge is pumped away through sludge backflow collecting pipe with through hole, the problem of stopping work for dredging is solved;But continuous aeration can make sludge particles continuously disturbed by bubbles, so that they are suspended in water, and it is difficult to precipitate, so that in MBR system, most of sludge exists in suspended state, and is separated by membrane filtration, instead of relying on precipitation. UTILITY MODEL CONTENTS

[0005] The purpose of the present application is to solve the above problems, and a kind of MBR membrane pool is provided, and the groove body is separated into sludge rising area and sludge sedimentation area with upper end and lower end being open by increasing baffle, under the impetus of aeration element, water flow forms circulation around baffle, and sludge in sludge rising area is made to enter sludge sedimentation area by baffle, so as to accelerate the precipitation of sludge and reduce the burden of membrane assembly.Meanwhile, the present application also discloses a sewage treatment system with the MBR membrane pool.

[0006] To achieve the above object, the present application provides the following technical scheme:

[0007] The MBR membrane tank comprises a tank body, a membrane assembly, an aeration element arranged in the membrane assembly, and at least two baffles for separating the tank body into a sludge rising area and a sludge settling area both of which are open at the upper and lower ends; the baffles are lower than the liquid level in the tank body, the membrane assembly is arranged in the sludge rising area, and the aeration element is arranged below the membrane assembly.

[0008] Under the pushing of the aeration element, the sludge can pass through the baffles from the sludge settling area into the sludge settling area; the tank body is further provided with a discharge pipe for discharging the sludge settled at the bottom of the tank body.

[0009] Preferably, the two baffles are symmetrically arranged on the inner wall of the tank body, the membrane assembly is arranged between the symmetrically arranged baffles, the symmetrically arranged baffles form the sludge rising area, and the space between the baffles and the inner wall of the tank body forms the sludge settling area.

[0010] Preferably, the membrane assembly comprises a frame, an MBR membrane element connected in the frame, and a water outlet pipe connected to the MBR membrane element, the aeration element is connected to the bottom of the frame, and the water outlet pipe is used for discharging water filtered by the MBR membrane element.

[0011] Preferably, the aeration element comprises a gas supply pipe and a plurality of aeration heads connected to the gas supply pipe, and the gas supply pipe is connected to an external gas supply device.

[0012] Preferably, the MBR membrane tank further comprises a pre-sedimentation module, the pre-sedimentation module comprises a guide hopper arranged at the bottom of the tank body, the guide hopper is arranged below the membrane assembly, the discharge pipe is connected to the output end of the guide hopper, and the feed inlet of the tank body is arranged between the membrane assembly and the guide hopper.

[0013] Preferably, the MBR membrane tank further comprises a swash plate assembly connected in the tank body and arranged between the guide hopper and the membrane assembly, and the feed inlet of the tank body is arranged between the guide hopper and the swash plate assembly.

[0014] Meanwhile, the application also discloses a sewage treatment system comprising a biochemical reaction tank and the above MBR membrane tank, the biochemical reaction tank and the MBR membrane tank are communicated, and the discharge pipe is used for discharging the sludge in the MBR membrane tank into the biochemical reaction tank.

[0015] Compared with the prior art, the application has the following beneficial effects:

[0016] The application separates the tank body into the sludge rising area and the sludge settling area through the baffles, forms a circulating flow around the baffles under the pushing of the aeration element, and promotes the sludge in the sludge rising area to pass through the baffles into the sludge settling area, thereby promoting the sedimentation of the sludge. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic view of the MBR membrane tank of Embodiment 1.

[0018] Figure 2 is a piping diagram of the sewage treatment system of Example 2;

[0019] In which, the reference numerals of each figure are as follows:

[0020] Tank 1; Membrane assembly 2; Aeration element 3; Baffle 4; Pre- sedimentation module 5; Inclined plate assembly 6; Biochemical reaction tank 7; Sludge rising area 11; Sludge settling area 12; Discharge pipe 13; MBR membrane element 21; Effluent pipe 22; Gas conveying pipe 31; Aeration head 32; Guide hopper 51. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without any creative work under the premise of the present application, belong to the scope of protection of the present application.

[0022] Example 1

[0023] Reference Figure 1 A MBR membrane tank, comprising a tank 1, a membrane assembly 2, an aeration element 3 arranged in the membrane assembly 2, and at least two baffles 4, the baffles 4 being used to separate the tank 1 into a sludge rising area 11 and a sludge settling area 12, both of which are open at the upper and lower ends; the baffles 4 are lower than the liquid level in the tank 1, the membrane assembly 2 is arranged in the sludge rising area 11, and the aeration element 3 is located below the membrane assembly 2.

[0024] Under the push of the aeration element 3, the sludge can pass over the baffles 4 from the sludge settling area 12 into the sludge settling area 12; the tank 1 is further provided with a discharge pipe 13 for outputting the sludge precipitated at the bottom of the tank 1.

[0025] In this design, part of the sludge in the sludge-water mixture entering the tank 1 will directly precipitate at the bottom of the tank 1, and the other part will enter the sludge rising area 11 under the action of the gas flow of the aeration element 3. In the sludge rising area 11, the sludge is continuously disturbed by the bubbles, so that it is suspended in the water, and under the push of the aeration element 3, it passes through the baffle 4 from the top of the baffle 4 into the sludge settling area 12. Because the aeration element 3 is arranged in the sludge rising area 11, the sludge in the sludge settling area 12 will not be affected by the bubbles, so that the sludge settling area 12 can accelerate the precipitation of the sludge. At the bottom of the baffle 4, the gas flow of the aeration element 3 will form a low-pressure area at the bottom of the baffle 4, which will cause the water flow and a small part of the sludge at the bottom of the sludge settling area 12 to enter the sludge rising area 11, thereby forming a circulation around the baffle 4, promoting the precipitation of the sludge and reducing the burden on the membrane assembly 2.

[0026] Preferably, the baffle 4 is two, and the two baffles 4 are symmetrically arranged and connected to the inner wall of the tank 1. The membrane assembly 2 is located between the two symmetrically arranged baffles 4. The space between the two symmetrically arranged baffles 4 is the sludge rising area 11, and the space between the baffle 4 and the inner wall of the tank 1 is the sludge settling area 12.

[0027] In actual use, the operator can increase the number of baffles 4 according to the actual situation. In other embodiments, the baffle 4 can also be installed on the membrane assembly 2, but it should be noted that the sludge rising area 11 and the sludge settling area 12 are only connected through the top and the bottom. The symmetric arrangement of the baffle 4 connected to the inner wall of the tank 1 in this embodiment can ensure the stability of the baffle 4.

[0028] In this embodiment, the membrane assembly 2 includes a frame (not shown in the figure), an MBR membrane element 21 connected in the frame, and a water outlet pipe 22. The aeration element 3 is connected to the bottom of the frame, and the water outlet pipe 22 is connected to the MBR membrane element 21. The water outlet pipe 22 is used to output the water filtered by the MBR membrane element 21.

[0029] Further, the aeration element 3 includes a gas supply pipe 31 and a plurality of aeration heads 32 connected to the gas supply pipe 31. The gas supply pipe 31 is connected to an external gas delivery device.

[0030] Since the use of the membrane assembly 2 in the MBR membrane tank is a conventional technical means in the art, and the specific structure of the membrane assembly 2 can refer to the MBR membrane assembly disclosed in Chinese Patent CN115672043A, the specific structure and working principle of the membrane assembly 2 will not be described in detail in this embodiment.

[0031] Preferably, the sewage treatment system further comprises a pre-sedimentation module 5, the pre-sedimentation module 5 comprises a guide hopper 51 arranged at the bottom of the tank body 1, the guide hopper 51 is located below the membrane assembly 2, the discharge pipe 13 is connected with the output end of the guide hopper 51, and the feed inlet of the tank body 1 is located between the membrane assembly 2 and the guide hopper 51.

[0032] In actual application, the feed inlet of the tank body 1 is located between the membrane assembly 2 and the guide hopper 51, so that most of the sludge in the sludge-water mixture entering the tank body 1 is preliminarily separated in the guide hopper 51 and precipitates at the bottom of the guide hopper 51, because in the treatment of the biochemical reaction tank 7, most of the nitrate in the sludge-water mixture has been converted into nitrogen, so the dissolved oxygen and the nitrate in the sludge after preliminary separation are also relatively low, which is very beneficial to the biochemical reaction tank 7.

[0033] After the sludge is pre-sedimented, the sludge in the guide hopper 51 is concentrated, the concentration is high, the backflow amount to the biochemical reaction tank 7 can be reduced, and the energy consumption can also be reduced.

[0034] Preferably, the sewage treatment system further comprises an inclined plate assembly 6, the inclined plate assembly 6 is connected in the tank body 1 and located between the guide hopper 51 and the membrane assembly 2, and the feed inlet of the tank body 1 is located between the guide hopper 51 and the inclined plate assembly 6. Specifically, the inclined plate assembly 6 can adopt the structure of an inclined plate or an inclined pipe to improve the sedimentation effect, and also can avoid the sludge in the guide hopper 51 from returning to the sludge upflow area 11, and the operator can also set an air or water backwashing unit at the bottom of the inclined plate assembly 6 according to the actual situation to prevent blockage. The inclined plate assembly 6 in the embodiment can refer to the inclined plate structure disclosed in Chinese patent CN108939621A.

[0035] Embodiment 2

[0036] Reference Figure 2 A sewage treatment system, comprising a biochemical reaction tank 7 and an MBR membrane tank as in Embodiment 1, the biochemical reaction tank 7 and the MBR membrane tank are communicated, and the discharge pipe 13 is used for outputting the sludge in the MBR membrane tank to the biochemical reaction tank 7.

[0037] The biochemical reaction tank 7 in the embodiment is described by taking the AOA reaction tank as an example, but is not limited to the AOA reaction tank, and other biochemical reaction tanks 7 can also be used. In this design, most of the sludge in the sludge-water mixture entering the MBR membrane tank is preliminarily separated in the pre-sedimentation module 5 and precipitates at the bottom of the pre-sedimentation module 5, and a small amount of sludge enters the sludge rising area 11 and enters the sludge sedimentation area 12 under the push of the aeration element 3, to promote the precipitation of the sludge. The finally precipitated sludge is returned to the AOA reaction tank through the discharge pipe 13. The system fully utilizes the fact that most of the nitrate in the sludge-water mixture has been converted into nitrogen in the anoxic environment of the AOA reaction tank, so that the dissolved oxygen and the nitrate in the preliminarily separated sludge are also relatively low, which is very beneficial to maintaining and guaranteeing the anoxic environment and the anaerobic environment in the AOA reaction tank, and guarantees the effect of denitrification and phosphorus removal.

[0038] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A MBR membrane tank comprising a tank body, a membrane assembly, an aeration element provided in the membrane assembly, characterized in that, Further comprising at least two baffles for separating the tank into a sludge rising area and a sludge settling area both of which are open at the upper and lower ends; the baffles are lower than the liquid level in the tank, the membrane assembly is arranged in the sludge rising area, and the aeration element is below the membrane assembly; Under the pushing of the aeration element, sludge can pass over the baffles from the sludge settling area into the sludge settling area; the tank is further provided with a discharge pipe for outputting sludge precipitated at the bottom of the tank.

2. The MBR tank according to claim 1, characterized in that, The baffles are two, which are symmetrically arranged and connected to the inner wall of the tank, the membrane assembly is between the symmetrically arranged baffles, and the sludge rising area is between the symmetrically arranged baffles, and the sludge settling area is between the baffles and the inner wall of the tank.

3. The MBR tank of claim 1, wherein, The membrane assembly comprises a frame, an MBR membrane element connected in the frame, and a water outlet pipe, the aeration element is connected to the bottom of the frame, and the water outlet pipe is connected to the MBR membrane element, and the water outlet pipe is used for outputting water filtered by the MBR membrane element.

4. The MBR tank of claim 1, wherein, The aeration element comprises a gas supply pipe and a plurality of aeration heads connected to the gas supply pipe, and the gas supply pipe is connected to an external gas supply device.

5. The MBR tank of claim 1, wherein, Further comprising a pre-sedimentation module, which comprises a guide hopper arranged at the bottom of the tank, the guide hopper is below the membrane assembly, the discharge pipe is connected to the output end of the guide hopper, and the feed inlet of the tank is between the membrane assembly and the guide hopper.

6. The MBR tank of claim 5, wherein, Further comprising a swash plate assembly, which is connected in the tank and between the guide hopper and the membrane assembly; the feed inlet of the tank is between the guide hopper and the swash plate assembly.

7. A sewage treatment system characterised in that, Comprise a biochemical reaction tank and the MBR membrane tank as claimed in any one of claims 1-6, the biochemical reaction tank and the MBR membrane tank are communicated, and the discharge pipe is used for outputting sludge in the MBR membrane tank into the biochemical reaction tank.

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