A sewage plant MBR membrane cleaning system

Abstract

The application belongs to the technical field of dismounting tools and discloses a sewage plant MBR membrane cleaning system which comprises a membrane pool, a negative pressure device and a detection device, an MBR membrane is arranged in the membrane pool, the negative pressure device comprises a negative pressure tank and a self-priming pump, the negative pressure tank is communicated with the membrane pool through a water outlet pipe, a water inlet of the self-priming pump is connected with a water outlet of the negative pressure tank, a water outlet of the self-priming pump is connected with a water inlet of a dosing assembly, and a water outlet of the dosing assembly is connected with a water inlet of the membrane pool; the detection device comprises a negative pressure gauge and a pH detector, the negative pressure gauge is arranged on the negative pressure pump, and the pH detector is arranged in the membrane pool. The MBR membrane is cleaned in a reciprocating cycle mode, the MBR membrane is cleaned while the cleaning agent is saved, the MBR membrane surface and the MBR membrane interior can be effectively cleaned, and the water flux is improved. The offline manual membrane dismounting, cleaning and chemical cleaning mode is reasonably replaced, the working efficiency is improved, the labor is reduced, and potential safety hazards during manual cleaning are avoided.

Description

Technical Field

[0001] This utility model belongs to the field of membrane cleaning technology, specifically relating to a wastewater treatment plant MBR membrane cleaning system. Background Technology

[0002] In recent years, the application fields of MBR membranes have been continuously expanding. Besides reclaimed water reuse, domestic sewage, and industrial wastewater treatment, the application of MBR in the upgrading and transformation of secondary sedimentation wastewater treatment plants has also received widespread attention. Membrane bioreactors (MBRs) use membranes to filter sludge-containing wastewater in the biological reaction tank, achieving sludge-water separation. Unlike the activated sludge process, it does not use sedimentation tanks for solid-liquid separation. Instead, it uses ultrafiltration membrane separation technology to replace the sedimentation tanks and conventional filtration units of the traditional activated sludge process, achieving complete separation of hydraulic retention time (HRT) and sludge age (STR).

[0003] In existing technologies, such as Chinese utility model patent application number CN202321791102.0, a modular treatment device for plate-type MBR membranes is disclosed. Specifically, it includes a treatment tank, an air-washing pipe, an effluent pipe, an effluent tank, plate-type MBR membrane modules, a blower, and a negative pressure pump. The treatment tank is equipped with a drain valve; the air-washing pipe is equipped with a gas regulating valve, and also has a pressure gauge, a first flow meter, and a blower; the effluent pipe is equipped with an effluent valve, and also has a negative pressure gauge, a second flow meter, and a negative pressure pump; the effluent tank has a main effluent valve; and the plate-type MBR membrane module is composed of multiple individual plate-type MBR membrane modules connected by bolts. This modular treatment device for plate-type MBR membranes is modular and reusable. When cleaning or replacing the MBR membrane due to membrane fouling offline, only wastewater needs to be discharged, and the individual modules need to be disassembled in the membrane tank. The membrane frames can be reused, reducing labor and saving subsequent economic costs.

[0004] However, the above-mentioned cleaning method still requires manual disassembly and installation of the membrane, which is not only time-consuming and labor-intensive, but also poses safety hazards such as falls from heights, poisoning, and suffocation during the disassembly and installation process. Summary of the Invention

[0005] Based on this, this application provides a wastewater treatment plant MBR membrane cleaning system to solve the problem that the membrane still needs to be disassembled and installed manually during cleaning, which is not only time-consuming and labor-intensive, but also poses safety hazards such as falls from heights, poisoning, and suffocation during the disassembly and installation process.

[0006] The technical solution to the above-mentioned technical problems in this application is as follows:

[0007] A wastewater treatment plant MBR membrane cleaning system includes:

[0008] The system includes a membrane tank, a negative pressure device, and a detection device. The membrane tank contains an MBR membrane. The negative pressure device includes a negative pressure tank and a self-priming pump. The negative pressure tank is connected to the membrane tank via an outlet pipe. The inlet of the self-priming pump is connected to the outlet of the negative pressure tank, and the outlet of the self-priming pump is connected to the inlet of a dosing assembly. The outlet of the dosing assembly is connected to the inlet of the membrane tank. The dosing assembly is used to add cleaning agent to the membrane tank. The detection device includes a negative pressure gauge and a pH meter. The negative pressure gauge is mounted on the negative pressure pump and is used to detect the negative pressure value. The pH meter is located inside the membrane tank and is used to monitor the pH value within the membrane tank.

[0009] Preferably, a check valve is provided on the water outlet pipe.

[0010] Preferably, there are several outlet pipes, and the inlet of each outlet pipe corresponds to a set of MBR membranes.

[0011] Preferably, the dosing assembly includes several dosing chambers, and each dosing chamber is equipped with a weighing device for weighing the amount of cleaning agent added.

[0012] Preferably, the dosing chamber is provided with an observation port for observing the type of cleaning agent inside the dosing chamber.

[0013] Preferably, the dosing assembly further includes a temporary storage tank located below the dosing chamber, with the inlet of the temporary storage tank connected to the outlet of the self-priming pump and the outlet of the temporary storage tank connected to the inlet of the membrane tank. A filter box is provided inside the temporary storage tank for filtering the cleaning agent.

[0014] Preferably, it further includes a collection device, which is connected to the outlet of the self-priming pump via a connecting pipe. A first valve is provided on the connecting pipe. The collection device is used to collect the cleaning agent containing contaminants.

[0015] Preferably, the collection device includes a collection tank, a filter screen, and a water pump. The inlet of the collection tank is connected to the outlet of the connecting pipe. The filter screen is disposed at the outlet of the connecting pipe. The inlet of the water pump is disposed in the collection tank. The outlet of the water pump is connected to the inlet of the dosing assembly. A second valve is provided between the water pump and the dosing assembly.

[0016] Preferably, a partition is provided in the collection pool, the partition is located in the middle of the collection pool, and the height of the partition is lower than the height of the collection pool. The inlet of the water pump is located at the end of the collection pool away from the outlet of the connecting pipe.

[0017] The technical solution adopted in this application can achieve the following beneficial effects:

[0018] 1. The MBR membrane is cleaned by reciprocating circulation, which saves cleaning agent while cleaning the MBR membrane. Both the surface and the inside of the MBR membrane are effectively cleaned, thus improving the permeate flux.

[0019] 2. It reasonably replaces the offline manual film removal, cleaning, and chemical soaking cleaning mode, improves work efficiency, reduces labor costs, and avoids potential safety hazards during manual cleaning.

[0020] 3. By displaying the negative pressure, the membrane fiber blockage can be monitored in a timely manner. When the negative pressure is between -0.05Mpa and -0.06Mpa, the MBR membrane can be cleaned online with cleaning agent in a timely manner to achieve the optimal cleaning capacity without disassembling or damaging the membrane. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall MBR membrane cleaning system for the wastewater treatment plant in this application.

[0022] Figure 2 This is a partial front view of the MBR membrane cleaning system for the wastewater treatment plant in this application.

[0023] Figure 3 for Figure 2 AA cross-section view.

[0024] Figure 4 This is a partial schematic diagram of the MBR membrane cleaning system for the wastewater treatment plant in this application. Figure 1 .

[0025] Figure 5 This is a partial schematic diagram of the MBR membrane cleaning system for the wastewater treatment plant in this application. Figure 2 .

[0026] Figure 6 This is a partial schematic diagram of the MBR membrane cleaning system for the wastewater treatment plant in this application. Figure 3 .

[0027] In the diagram: Membrane tank 100, MBR membrane 110, effluent pipe 120, check valve 121, negative pressure device 200, negative pressure tank 210, self-priming pump 220, negative pressure gauge 310, collection device 400, collection tank 410, filter screen 420, baffle plate 430, connecting pipe 440, first valve 441, dosing assembly 500, dosing chamber 510, observation port 511, temporary storage tank 520, filter box 530, disc 531, sliding groove 532, push rod 533, filter screen 534, through hole 535, second valve 540. Detailed Implementation

[0028] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0029] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," "top," "bottom," "end," "top," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] Please see Figures 1 to 6 This application provides a wastewater treatment plant MBR membrane cleaning system, including a membrane tank 100, a negative pressure device 200, and a detection device. An MBR membrane 110 is installed inside the membrane tank 100. The negative pressure device 200 includes a negative pressure tank 210 and a self-priming pump 220. The negative pressure tank 210 is connected to the membrane tank 100 via an outlet pipe 120. The inlet of the self-priming pump 220 is connected to the outlet of the negative pressure tank 210, and the outlet of the self-priming pump 220 is connected to... The device includes an inlet for a dosing assembly 500, the outlet of which is connected to the inlet of the membrane tank 100. The dosing assembly 500 is used to add cleaning agent into the membrane tank 100. The detection device includes a negative pressure gauge 310 and a pH value detector. The negative pressure gauge 310 is installed on the negative pressure pump and is used to detect the negative pressure value. The pH value detector is installed inside the membrane tank 100 and is used to monitor the pH value inside the membrane tank 100.

[0032] Specifically, membrane tank 100 and MBR membrane 110 are commonly used filtration and purification devices in wastewater treatment plants. Negative pressure gauge 310 detects and maintains the negative pressure value between -0.05 MPa and -0.08 MPa. The dosing unit 500 stores citric acid and sodium hydroxide cleaning agent. Furthermore, when cleaning the MBR membrane 110 is required, the operator controls the dosing unit 500 to add cleaning agent to the membrane tank 100, soaking the MBR membrane 110 and softening the sludge. The self-priming pump 220 is then activated to create negative pressure, and... Adjusting the negative pressure using the negative pressure gauge 310 and controlling it between -0.05 MPa and -0.08 MPa, the softened sludge on and inside the MBR membrane 110 is discharged into the negative pressure tank 210 under negative pressure. Then, air is introduced into the membrane tank 100 by the self-priming pump 220 to continue soaking the MBR membrane 110 and continuously softening the sludge on and inside the MBR membrane 110. The sludge is then circulated again under the negative pressure of the self-priming pump 220. Operators can then use their experience to remove the cleaning agent containing sludge or continue the circulation.

[0033] The technical solution of the MBR membrane 110 cleaning system adopted in this application can achieve the following beneficial effects:

[0034] 1. The MBR membrane 110 is cleaned by reciprocating circulation, which saves cleaning agent while cleaning the MBR membrane 110. Both the surface and the interior of the MBR membrane 110 are effectively cleaned, thereby improving the permeate flux.

[0035] 2. It reasonably replaces the offline manual film removal, cleaning, and chemical soaking cleaning mode, improves work efficiency, reduces labor costs, and avoids potential safety hazards during manual cleaning.

[0036] 3. By displaying the negative pressure, the blockage status of the MBR membrane 110 can be monitored in a timely manner. When the negative pressure is between -0.05Mpa and -0.06Mpa, the MBR membrane 110 should be cleaned online with cleaning agent in a timely manner to achieve the optimal cleaning capacity without disassembling or damaging the membrane.

[0037] Based on the above solution, a check valve 121 is installed on the outlet pipe 120. Several outlet pipes 120 are provided, and the inlet of each outlet pipe 120 corresponds to a group of MBR membranes 110. By setting the check valve 121, the problem of cleaning agent containing sludge flowing backward from the negative pressure tank 210 into the membrane tank 100 is solved; by setting a number of outlet pipes 120 corresponding to the number of MBR membrane groups 110, the softened sludge on the surface and inside each group of MBR membranes 110 can be removed more quickly and efficiently, solving the problem of low sludge removal efficiency and long time for a single outlet pipe 120.

[0038] In a preferred embodiment of this application, the dosing assembly 500 includes a plurality of dosing chambers 510, each of which is equipped with a weighing device for weighing the amount of cleaning agent added.

[0039] At least one dosing chamber 510 is provided, storing sodium hypochlorite. Multiple chambers can be provided to store cleaning agents such as citric acid and sodium hydroxide. The weighing device can be, but is not limited to, a flow meter or a level sensor. If a flow meter is used, the amount of cleaning agent added is calculated based on the flow meter and time. If a level sensor is used, the amount of cleaning agent added is manually determined based on the drop in the liquid level. Preferably, a level sensor is used. By setting up a weighing device, the problem of insufficient or excessive addition of cleaning agent due to the inability to measure the amount added manually is solved.

[0040] Furthermore, the dosing chamber 510 is provided with an observation port 511, which is used to observe the type of cleaning agent inside the dosing chamber 510. The observation port 511 is made of transparent material and has several graduations. The graduations can be set according to the amount added, standard volume, etc. The operator observes the initial level of the cleaning agent in the dosing chamber 510, and then adds cleaning agent to make the level of the cleaning agent drop. When the level drops to the preset level graduation, the operator immediately closes the dosing chamber 510, thereby controlling the amount added. At the same time, the operator identifies the type of cleaning agent inside the dosing chamber 510 through the observation port 511 and manually judges whether to add this type of cleaning agent. This solves the problem that when there are many types of cleaning agents, the closed dosing chamber 510 cannot identify them, leading to incorrect addition of cleaning agent.

[0041] In the above scheme, in order to reduce the sludge content in the circulating cleaning agent, the dosing assembly 500 further includes a temporary storage tank 520. The temporary storage tank 520 is located below the dosing chamber 510, and the inlet of the temporary storage tank 520 is connected to the outlet of the self-priming pump 220. The outlet of the temporary storage tank 520 is connected to the inlet of the membrane tank 100. A filter box 530 is provided inside the temporary storage tank 520, and the filter box 530 is used to filter the cleaning agent.

[0042] The inlet of the temporary storage tank 520 is equipped with a filter box 530, which includes a disc 531 and a push rod 533. The disc 531 is rotatably mounted on the side wall of the temporary storage tank 520, and the inlet of the temporary storage tank 520 is covered by the disc 531. The disc 531 is provided with several through holes 535, and a filter screen 534 is covered on the through holes 535 (the filter screen 534 is snapped onto the disc 531). The size of the through holes 535 is the same as the size of the inlet of the temporary storage tank 520. The disc 531 is provided with several sliding grooves 532. One end of the push rod 533 is slidably engaged with the sliding groove 532 (connected by means of, but not limited to, flexible sleeves). The other end of the push rod 533 extends out of the temporary storage tank 520 and is slidably connected to the side wall of the temporary storage tank 520. When the cleaning agent containing sludge enters from the inlet of the temporary storage tank 520, it is filtered by the filter screen 534 (using a fishing net bag type). The cleaning agent enters the temporary storage tank 520, and then the operator, based on experience, controls the addition of new cleaning agent to the dosing tank 510. The cleaning agent then enters the membrane tank 100 together. The pH value detector in the membrane tank 100 is used for testing. If the pH value is insufficient, the operator manually adds more cleaning agent. The operator, based on experience, judges the clogging rate of the filter screen 534 and presses the push rod 533 to push one side of the sliding groove 532, causing the disc 531 to rotate. When the next through hole 535 coincides with the inlet of the temporary storage tank 520, the operator stops pressing down the push rod 533 (when the push rod 533 cannot be pressed down, the operator pulls the push rod 533 upwards instead). When the system is offline and shut down, the filter screen 534 that is clipped onto the through hole 535 is removed and replaced. By setting up a temporary storage tank 520 and a filter screen 534, the cleaning agent containing sludge is filtered to reduce the sludge content in the cleaning agent.

[0043] In another embodiment of this application, a collection device 400 is further included. The collection device 400 is connected to the outlet of the self-priming pump 220 via a connecting pipe 440. A first valve 441 is provided on the connecting pipe 440. The collection device 400 is used to collect the cleaning agent containing contaminants. The collection device 400 is located on one side of the self-priming pump 220. When the operator judges based on experience that the cleaning agent has circulated several times, the cleaning agent containing sludge is discharged directly into the collection device 400. The collection device 400 treats the cleaning agent using chemical or physical methods, and then recycles or treats it, reducing the pollution of the cleaning agent to the environment.

[0044] Furthermore, the collection device 400 includes a collection tank 410, a filter screen 420, and a water pump. The inlet of the collection tank 410 is connected to the outlet of the connecting pipe 440. The filter screen 420 is disposed at the outlet of the connecting pipe 440. The inlet of the water pump is disposed in the collection tank 410. The outlet of the water pump is connected to the inlet of the dosing assembly 500. A second valve 540 is provided between the water pump and the dosing assembly 500.

[0045] The filter screen 420 is detachably installed at the inlet of the collection tank 410. The detachment method includes, but is not limited to, sliding plates, snap-fit ​​rings, etc. The inlet of the water pump is located on the side of the collection tank 410 away from the filter screen 420. The cleaning agent, which has circulated multiple times and contains sludge, is filtered by the filter screen 420 along the connecting pipe 440 and enters the collection tank 410. It is then pumped by the water pump into the temporary storage tank 520 of the dosing assembly 500. If the sludge cleaning agent cannot be recirculated, the water pump does not start, and it is directly discharged from the collection tank 410 after the treatment truck arrives and is taken away for treatment. The filter screen 420 is manually replaced according to the number of cycles. By setting up the collection tank 410 and the filter screen 420, the cleaning agent, which has circulated multiple times and contains sludge, is filtered, improving the utilization rate of the cleaning agent. Simultaneously, in conjunction with the filtration of the filter screen 534 in the temporary storage tank 520, dual filtration reduces waste of the cleaning agent, thereby reducing costs.

[0046] Furthermore, a partition 430 is provided inside the collection pool 410. The partition 430 is located in the middle of the collection pool 410, and the height of the partition 430 is lower than the height of the collection pool 410. The inlet of the water pump is located at the end of the collection pool 410 away from the outlet of the connecting pipe 440.

[0047] A baffle 430 is installed inside the collection tank 410, and the baffle 430 is parallel to the filter screen 420. The height of the baffle 430 is three-quarters the height of the collection tank 410. The inlet of the water pump is located at the end of the baffle 430 away from the filter screen 420. The cleaning agent that passes through the filter screen 420 falls into the collection tank 410 and is blocked by the baffle on the side of the collection tank 410 near the filter screen 420. The level of the cleaning agent gradually rises, the sludge falls to the bottom, and the cleaning agent overflows the baffle and enters the other side of the collection tank 410. Then the water pump transports the cleaning agent to the temporary storage tank 520. By setting up the baffle, the cleaning agent is further filtered by sedimentation, thereby reducing the sludge content in the cleaning agent. The utilization rate of the cleaning agent is improved by multiple cycles, and the MBR membrane 110 is continuously softened by multiple cycles, solving the problem of difficult sludge cleaning inside the MBR membrane 110.

[0048] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A wastewater treatment plant MBR membrane cleaning system, characterized in that, include: A membrane tank, wherein an MBR membrane is installed inside the membrane tank; A negative pressure device, comprising a negative pressure tank and a self-priming pump, wherein the negative pressure tank is connected to the membrane tank via an outlet pipe, the inlet of the self-priming pump is connected to the outlet of the negative pressure tank, the outlet of the self-priming pump is connected to the inlet of a dosing component, and the outlet of the dosing component is connected to the inlet of the membrane tank, wherein the dosing component is used to add cleaning agent into the membrane tank; as well as The detection device includes a negative pressure gauge and a pH value detector. The negative pressure gauge is installed on the negative pressure tank and is used to detect the negative pressure value. The pH value detector is installed in the membrane tank and is used to monitor the pH value in the membrane tank.

2. The wastewater treatment plant MBR membrane cleaning system as described in claim 1, characterized in that, A check valve is installed on the water outlet pipe.

3. The wastewater treatment plant MBR membrane cleaning system as described in claim 2, characterized in that, The water outlet pipe is provided in several parts, and the water inlet of each water outlet pipe corresponds to a set of MBR membranes.

4. The wastewater treatment plant MBR membrane cleaning system as described in claim 1, characterized in that, The dosing assembly includes several dosing chambers, each containing a weighing device used to weigh the amount of cleaning agent added.

5. The wastewater treatment plant MBR membrane cleaning system as described in claim 4, characterized in that, The dosing chamber is equipped with an observation port, which is used to observe the type of cleaning agent inside the dosing chamber.

6. The wastewater treatment plant MBR membrane cleaning system as described in claim 4, characterized in that, The dosing assembly also includes a temporary storage tank located below the dosing chamber. The inlet of the temporary storage tank is connected to the outlet of the self-priming pump, and the outlet of the temporary storage tank is connected to the inlet of the membrane tank. A filter box is installed inside the temporary storage tank for filtering the cleaning agent.

7. The wastewater treatment plant MBR membrane cleaning system as described in claim 1, characterized in that, It also includes a collection device, which is connected to the outlet of the self-priming pump via a connecting pipe. A first valve is provided on the connecting pipe. The collection device is used to collect the cleaning agent containing contaminants.

8. The wastewater treatment plant MBR membrane cleaning system as described in claim 7, characterized in that, The collection device includes a collection tank, a filter screen, and a water pump. The inlet of the collection tank is connected to the outlet of the connecting pipe. The filter screen is installed at the outlet of the connecting pipe. The inlet of the water pump is located in the collection tank. The outlet of the water pump is connected to the inlet of the dosing assembly. A second valve is provided between the water pump and the dosing assembly.

9. The wastewater treatment plant MBR membrane cleaning system as described in claim 8, characterized in that, A partition is provided inside the collection tank. The partition is located in the middle of the collection tank and its height is lower than the height of the collection tank. The inlet of the water pump is located at the end of the collection tank away from the outlet of the connecting pipe.

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