Backwash water filtering and lifting device for MBR (Membrane Bioreactor) treatment system

Abstract

The utility model discloses a backwashing water filtering and lifting device for an MBR (Membrane Biological Reactor) treatment system, which relates to the technical field of MBR treatment systems, and comprises a membrane pool and a membrane component positioned in the membrane pool, one side of the membrane component is provided with a backwashing filtering mechanism, the backwashing filtering mechanism comprises a water producing system, the water producing system is connected with the end part of the membrane component, and the water producing system is connected with the membrane component. The water production system is used for normally producing water; the vacuum water diversion tank is connected to the end part of the water production system; the backwashing system is connected to the vacuum water diversion tank and the membrane component, and the backwashing system is used for backwashing. The utility model solves the problems that the traditional MBR (Membrane Biological Reactor) treatment system is insufficient in water suction from a lower-layer backwashing water tank, the occupied area of equipment is limited, and the requirement of large-flow and long-time backwashing water cannot be met when water is taken from a water production main pipe. On the basis, the device also needs to have a filtering function and the like, and meanwhile, the requirements of backwashing water filtering and lifting are met.

Description

Technical Field

[0001] This utility model relates to the field of MBR treatment system technology, and in particular to a backwash water filtration and lifting device for MBR treatment systems. Background Technology

[0002] In current MBR treatment systems, backwashing is necessary to mitigate membrane fouling, often using either clean water backwashing or chemically enhanced backwashing, with the water source being MBR permeate. Due to structural layout and land constraints, backwash tanks are sometimes located below the equipment room or far from the equipment, making water intake difficult. Furthermore, to ensure the backwash water does not carry contaminating or damaging particles, a backwash filter is required. However, the most common type of backwash pump is a centrifugal pump, which lacks self-priming capability. Therefore, stable water intake, pumping, and filtration for backwashing limit equipment investment, land use, and system safety and stability. Traditional solutions include adding a backwash tank nearby, drawing water directly from the permeate main pipe, or adding a priming tank, with a backwash filter remaining essential. However, these methods have the following problems: 1) Given the already limited space, the size of the backwash water tank is restricted, making it unsuitable for backwash systems requiring a large water volume; 2) The backwash water volume is generally 1.5 to 2 times the production water of the membrane module. Water is drawn from the main production water pipe, requiring a high production water volume from the remaining parallel membrane modules. During backwash pump operation, it is necessary to ensure that the production water of the remaining parallel membrane modules continuously meets the backwash water intake requirements, making it unsuitable for systems with no or few parallel membrane modules; 3) Simultaneously configuring a priming tank and backwash filter occupies a large area, and cleaning and replacing the filter bags is time-consuming and labor-intensive. Therefore, finding a device that allows the centrifugal pump to continuously and stably draw water from the backwash water tank beyond its suction lift, and that also has a filtration function, is a technical problem that needs to be solved. To this end, we propose a backwash water filtration and lifting device for MBR treatment systems. Utility Model Content

[0003] The purpose of this invention is to provide a backwash water filtration and lifting device for MBR treatment systems, addressing the problems of insufficient suction lift from the lower backwash water tank, limited equipment space, and inability to meet the requirements of large flow rates and long-term backwash water demand in traditional MBR treatment systems. Furthermore, the device must also possess filtration capabilities, simultaneously meeting the requirements for backwash water filtration and lifting.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A backwash water filtration and lifting device for an MBR treatment system includes a membrane tank and a membrane module located in the membrane tank. A backwash filtration mechanism is provided on one side of the membrane module. The backwash filtration mechanism includes:

[0006] A water production system, which is connected to the end of the membrane module and is used for normal water production;

[0007] A vacuum water priming tank, which is connected to the end of the water production system;

[0008] A backwashing system, which is connected to the vacuum water tank and the membrane module, and is used to perform backwashing.

[0009] Preferably, the backwashing system includes a backwashing pneumatic valve fixedly connected to one branch of the membrane module, a backwashing pump connected to the backwashing pneumatic valve, and a backwashing water tank located on one side of the vacuum water tank.

[0010] Preferably, the water production system includes a water production pneumatic valve connected to another branch of the membrane module, a water production pump connected to one end of the water production pneumatic valve, and a water production switching valve connected to one end of the water production pump.

[0011] Preferably, the vacuum water tank is provided with an inlet, an outlet, a backflushing inlet, a backflushing outlet, a filter bag, a water supply valve, an exhaust valve, a pressure gauge, and a drain outlet, and a drain valve is installed on the drain outlet. The tank cover of the vacuum water tank is connected by quick-release bolts.

[0012] Preferably, the inlet extends to the bottom of the backwash tank via a pipeline, and a manual butterfly valve is installed on the pipeline. A foot valve is also installed at the end of the pipeline. The outlet is connected to the backwash pump, and a manual butterfly valve is installed between the outlet and the backwash pump. The outlet pipeline of the backwash pump is connected to the inlet pipeline of the product water pump, and the opening and closing are controlled by a backwash pneumatic valve.

[0013] Preferably, the backwash inlet is connected to the product water pump, a manual butterfly valve for the backwash inlet is installed on the connecting pipeline between the backwash inlet and the product water pump, the backwash outlet extends to the sump through a pipeline, and a manual butterfly valve for the backwash outlet is installed on the pipeline, and the vent valve is connected to the backwash pump.

[0014] The technical effects and advantages of this utility model are as follows:

[0015] (1) The device adds a filter bag to the traditional vacuum water tank, so that while the backwash pump draws water from the low liquid level, it can also act as a backwash filter, which can trap impurities such as particles that may be present in the backwash water and cause MBR membrane fouling and damage, thus ensuring the safety of the MBR membrane system and saving equipment costs and space.

[0016] (2) The device adds a backflush port to the traditional vacuum water tank, and the water source is taken from the production water pipeline, which can significantly reduce the filter bag cleaning and replacement cycle; and the backflush pipeline can also be used to replenish the water tank, making full use of the clear water produced by the MBR and saving water resources.

[0017] (3) The device adds a vacuum pressure gauge to the traditional vacuum water tank, which can judge the filter bag contamination status in time according to the pressure reading, and perform backwashing or filter bag maintenance and replacement. The water tank cover is connected by quick-release bolts, which makes maintenance convenient.

[0018] (4) The device adds an exhaust valve to the traditional vacuum water tank and connects the pipeline to the inlet of the backwash pump. The gas separated from the water is discharged with the water flow in time and will not accumulate in the tank. This not only reduces the tank volume, but also keeps the water pump running stably for a long time. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the pipeline flow of the backwash water filtration and lifting device in the MBR treatment system of this utility model.

[0020] Figure 2 This is a schematic diagram of the backwash water filtration and lifting device of the MBR treatment system of this utility model.

[0021] In the diagram: 1. Membrane tank; 2. Membrane module; 3. Permeate pneumatic valve; 4. Permeate pump; 5. Permeate switching valve; 6. Backwash pneumatic valve; 7. Backwash pump; 8. Vacuum priming tank; 9. Foot valve; 10. Backwash tank; 11. Manual butterfly valve at outlet; 12. Manual butterfly valve at inlet; 13. Manual butterfly valve at backwash inlet; 14. Manual butterfly valve at backwash outlet; 15. Make-up valve; 16. Air vent valve; 17. Pressure gauge; 18. Drain valve; 19. Filter bag; 20. Backwash outlet; 21. Outlet; 22. Backwash inlet; 23. Inlet; 24. Drain; 25. Sump. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] This utility model provides, for example Figure 1-2 The device shown is a backwash water filtration and lifting device for an MBR treatment system, including a membrane tank 1 and a membrane module 2 located in the membrane tank 1. A backwash filtration mechanism is provided on one side of the membrane module 2. The backwash filtration mechanism includes: a product water system connected to the end of the membrane module 2 and used for normal water production; a vacuum water tank 8 connected to the end of the product water system; and a backwash system connected to the vacuum water tank 8 and the membrane module 2 and used for backwashing. Backwashing is performed through the backwash system.

[0024] It should be noted that the backwashing system includes a backwashing pneumatic valve 6 fixedly connected to one branch of the membrane module 2, a backwashing pump 7 connected to the backwashing pneumatic valve 6, and a backwashing water tank 10 located on one side of the vacuum water tank 8.

[0025] Furthermore, the water production system includes a water production pneumatic valve 3 connected to another branch of the membrane module 2, a water production pump 4 connected to one end of the water production pneumatic valve 3, and a water production switching valve 5 connected to one end of the water production pump 4.

[0026] Furthermore, the vacuum water tank 8 is equipped with an inlet 23, an outlet 21, a backflushing inlet 22, a backflushing outlet 20, a filter bag 19, a water supply valve 15, an exhaust valve 16, a pressure gauge 17, and a drain outlet 24. A drain valve 18 is installed on the drain outlet 24, and the tank cover of the vacuum water tank 8 is connected by quick-release bolts.

[0027] It should be noted that the inlet 23 extends to the bottom of the backwash tank 10 through a pipeline, and an inlet manual butterfly valve 12 is installed on the pipeline. A foot valve 9 is also installed at the end of the pipeline. The outlet 21 is connected to the backwash pump 7, and an outlet manual butterfly valve 11 is installed between the outlet 21 and the backwash pump 7. The outlet pipeline of the backwash pump 7 is connected to the inlet pipeline of the product water pump 4, and the opening and closing are controlled by the backwash pneumatic valve 6.

[0028] Furthermore, the backwash inlet 22 is connected to the product water pump 4, and a manual butterfly valve 13 for the backwash inlet is installed on the connecting pipeline between the backwash inlet 22 and the product water pump 4. The backwash outlet 20 extends to the sump 25 through the pipeline, and a manual butterfly valve 14 for the backwash outlet is installed on the pipeline. The air vent valve 16 is connected to the backwash pump 7.

[0029] like Figure 1 As shown, the vacuum water tank 8 is equipped with an inlet 23, an outlet 21, a backwash inlet 22, a backwash outlet 20, a filter bag 19, a water supply valve 15, an air vent valve 16, and a pressure gauge 17. The inlet 23 extends to the bottom of the backwash tank 10 via a pipeline and is controlled by a manual butterfly valve 12. A foot valve 9 is installed at the end of the pipeline. The outlet 21 is connected to the backwash pump 7 via a pipeline and is controlled by a manual butterfly valve 11. The outlet pipeline of the backwash pump 7 is connected to the inlet pipeline of the product water pump 4 and is controlled by a pneumatic backwash valve 6. The backwash inlet 22 is connected to the outlet pipeline of the product water pump 4 via a pipeline and is controlled by a manual butterfly valve 13. The backwash outlet 20 extends to the sump 25 via a pipeline and is controlled by a manual butterfly valve 14. The inlet pipe of the permeate pump 4 is connected to the membrane module 2 in the MBR membrane tank 1, and its opening and closing are controlled by the permeate pneumatic valve 3.

[0030] The specific implementation of this utility model is as follows: the vacuum water tank 8 is equipped with a water replenishment valve 15 for replenishing water during the first use. The manual butterfly valve 13 at the backwash inlet and the manual butterfly valve 14 at the backwash outlet are normally closed, while the manual butterfly valve 11 at the outlet and the manual butterfly valve 12 at the inlet are normally open. When the MBR enters the backwashing sequence, the product water pneumatic valve 3 closes, the backwash pneumatic valve 6 opens, the backwash pump 7 runs, and the backwash water is lifted. After passing through the filter bag 19 to filter impurities, it enters the membrane fibers for the MBR backwashing sequence. This fully utilizes the device's filtration function, satisfying the need for increased backwash water while replacing the function of the backwash filter, saving floor space and equipment costs.

[0031] like Figure 2 As shown, in this embodiment, the vent valve 16 is connected to the inlet pipe of the backwash pump 7. This not only reduces the tank volume but also ensures long-term stable operation of the pump. The function of the vent valve 16 is to promptly discharge the gas separated from the water with the water flow, preventing it from accumulating inside the tank, thus ensuring long-term stable operation. The vacuum priming tank 8 has a quick-release bolt connection for easy disassembly, allowing for periodic cleaning or replacement of the filter bag 19.

[0032] In this embodiment, when the pressure gauge 17 shows an abnormal pressure, the filter bag 19 is manually backwashed. The MBR system stops the backwashing sequence. During the product water sequence, the manual butterfly valve 11 at the outlet and the manual butterfly valve 12 at the inlet are closed, the manual butterfly valve 13 at the backwash inlet and the manual butterfly valve 14 at the backwash outlet are opened, and the product water switching valve 5 is closed. This process continues for three to five minutes, and the flushing wastewater is discharged into the collection pit 25. Using MBR product water to backwash the filter bag 19 meets the daily maintenance needs of the filter bag 19 and extends the cycle of manual cleaning and replacement.

[0033] Furthermore, after rinsing, the MBR's permeate water can continue to be used as a makeup water source for the vacuum water tank 8, making reasonable use of water resources. The specific operation is as follows: close the manual butterfly valve 14 of the backwash outlet, fill the tank with water, open the permeate water switching valve 5, close the manual butterfly valve 13 of the backwash inlet, and open the manual butterfly valve 11 of the outlet and the manual butterfly valve 12 of the inlet to switch the MBR backwashing sequence to normal operation.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A backwash water filtration and lifting device for an MBR treatment system, comprising a membrane tank (1) and a membrane module (2) located in the membrane tank (1), characterized in that, A backwashing filtration mechanism is provided on one side of the membrane module (2), the backwashing filtration mechanism comprising: A water production system is connected to the end of the membrane module (2) and is used for normal water production; Vacuum water tank (8), which is connected to the end of the water production system; A backwashing system is connected to the vacuum water tank (8) and the membrane module (2) and is used to perform backwashing.

2. The backwash water filtration and lifting device for an MBR treatment system according to claim 1, characterized in that, The backwashing system includes a backwashing pneumatic valve (6) fixedly connected to one branch of the membrane module (2), a backwashing pump (7) connected to the backwashing pneumatic valve (6), and a backwashing water tank (10) located on one side of the vacuum water tank (8).

3. The backwash water filtration and lifting device for an MBR treatment system according to claim 2, characterized in that, The water production system includes a water production pneumatic valve (3) connected to another branch of the membrane module (2), a water production pump (4) connected to one end of the water production pneumatic valve (3), and a water production switching valve (5) connected to one end of the water production pump (4).

4. The backwash water filtration and lifting device for an MBR treatment system according to claim 3, characterized in that, The vacuum water tank (8) is equipped with an inlet (23), an outlet (21), a backflushing inlet (22), a backflushing outlet (20), a filter bag (19), a water supply valve (15), an exhaust valve (16), a pressure gauge (17), and a drain outlet (24). A drain valve (18) is installed on the drain outlet (24). The tank cover of the vacuum water tank (8) is connected by quick-release bolts.

5. The backwash water filtration and lifting device for an MBR treatment system according to claim 4, characterized in that, The inlet (23) extends to the bottom of the backwash tank (10) through a pipeline, and a manual butterfly valve (12) is installed on the pipeline. A bottom valve (9) is also installed at the end of the pipeline. The outlet (21) is connected to the backwash pump (7), and a manual butterfly valve (11) is installed between the outlet (21) and the backwash pump (7). The outlet pipeline of the backwash pump (7) is connected to the inlet pipeline of the product water pump (4), and the opening and closing are controlled by the backwash pneumatic valve (6).

6. The backwash water filtration and lifting device for an MBR treatment system according to claim 5, characterized in that, The backwash inlet (22) is connected to the product water pump (4). A manual butterfly valve (13) for the backwash inlet is installed on the connecting pipeline between the backwash inlet (22) and the product water pump (4). The backwash outlet (20) extends to the sump (25) through a pipeline, and a manual butterfly valve (14) for the backwash outlet is installed on the pipeline. The exhaust valve (16) is connected to the backwash pump (7).

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