Low-energy-consumption self-cleaning MBR (Membrane Bioreactor) sewage treatment device

Abstract

The utility model discloses a self-cleaning MBR sewage treatment device with low energy consumption, which comprises an anoxic tank, an aerobic tank, an MBR tank, a clean water tank, a self-cleaning MBR component, an aeration system, a reflux pump, a water production system and a backwashing system, and has the characteristics of reducing the aeration rate of the MBR tank, prolonging the cleaning period of an MBR membrane and reducing the overall operation cost of sewage treatment.

Description

Technical Field

[0001] The utility model relates to a self-cleaning MBR sewage treatment device, in particular to a low-energy-consumption self-cleaning MBR sewage treatment device. Background Art

[0002] The MBR membrane sewage treatment process is currently the mainstream development direction of water treatment technology due to its high treatment efficiency, good effluent quality, compact equipment, small footprint, easy automatic control, and simple operation and management. However, the high operating cost of the MBR membrane water treatment process is also a major problem in the industry.

[0003] In addition to supplying oxygen, aeration in the MBR membrane reactor also uses rising bubbles to generate turbulent water flow to clean the membrane surface and prevent sludge aggregation. Therefore, the required aeration volume is very large. Generally, the gas-water ratio is 30:1 to 100:1. According to the "Technical Specifications for Wastewater Treatment Engineering by Biological Contact Oxidation", the maximum gas-water ratio for aerobic biochemical treatment is 15:1 to 20:1. It can be seen that the compressed air consumption of conventional MBR membrane process is 2 to 5 times that of normal aerobic biochemical treatment, that is, the power consumption is increased by 2 to 5 times.

[0004] Therefore, a low-energy self-cleaning MBR sewage treatment device is needed. The device can reduce the aeration volume and the number of backwashing times by being provided with a self-cleaning MBR component, thereby achieving the purpose of low energy consumption. Utility Model Content

[0005] In order to overcome the above-mentioned defects or shortcomings in the prior art, the purpose of the utility model is to provide a low-energy self-cleaning MBR sewage treatment device, which can reduce the aeration volume and the number of backwashing times by providing a self-cleaning MBR component, thereby achieving the purpose of low energy consumption.

[0006] The utility model provides a low-energy self-cleaning MBR membrane sewage treatment device, comprising an anoxic tank, an aerobic tank, an MBR tank, a clean water tank, a self-cleaning MBR component, a reflux pump, a water production suction pump, a backwash water pump, an aeration plate, a blower, an air control valve, a water production flow meter, a water production control electric valve, a backwash control electric valve, a pressure sensor, a membrane filament, a lower packaging plate, an upper packaging plate, a water production port, a flushing water inlet, a central flushing pipe, and a flushing hole.

[0007] The water from the regulating tank is connected to the water inlet of the anoxic tank through a pipeline, the anoxic tank is connected to the aerobic tank, a reflux pump and an aeration disk are arranged in the aerobic tank, an MBR component and an aeration system are arranged in the MBR tank, the reflux pump is connected to the MBR component, the aeration disk is connected to the blower, the MBR component is connected to the water production system and the backwash system, and the water production system and the backwash system are connected to the clean water tank.

[0008] Furthermore, the blower compresses air and transports it to the aeration plates of the aerobic tank and the MBR tank through pipelines. The compressed air is released into the aerobic tank through the aeration plates to provide oxygen required for biochemical reactions, while stirring the activated sludge in the aerobic tank and the MBR tank to prevent sedimentation.

[0009] Furthermore, the self-cleaning MBR component is composed of membrane filaments, a lower packaging plate, an upper packaging plate, a water production port, a flushing water inlet, a central flushing pipe, and a flushing hole. The energy-saving core component of the utility model is the self-cleaning MBR component.

[0010] Furthermore, the water production system includes a hose connected to the self-cleaning MBR component, a pressure sensor, a water production control electric valve, a water production suction pump, and a water production flow meter. The water production suction pump is connected to the self-cleaning MBR component through pipes, pipe fittings, and valves. The connected hose, pressure sensor, and water production control electric valve are installed on the water inlet pipe of the water production suction pump. The water production flow meter is installed on the water outlet pipe of the water production suction pump. The water production suction pump is connected to the clean water tank.

[0011] Furthermore, the backwash system includes a hose, a pressure sensor, a backwash control electric valve, and a backwash water pump connected to the self-cleaning MBR component. The connected hose, pressure sensor, and backwash control electric valve are installed on the backwash pump outlet pipe, and the backwash pump is connected to the clean water tank.

[0012] Furthermore, the self-cleaning MBR component is supported by a central flushing pipe, and the membrane filaments are evenly arranged around the central flushing pipe. The membrane filaments are composed of hollow nylon ropes and PVDF coatings. The upper and lower packaging disks adopt a disc structure. One end of the membrane filament is packaged in the lower packaging disk, and the other end is packaged in the upper packaging disk. The membrane filaments are packaged with polyurethane soft glue to avoid breaking of the membrane filaments. A hole is reserved in the center of the lower packaging disk for the central flushing pipe to pass through, and a fixed position for the central flushing pipe is reserved in the center of the upper packaging disk. The upper and lower packaging disks are connected and positioned by the central flushing pipe. The upper and lower packaging disks are covered with membrane filaments, and the spacing between them is shorter than the length of the membrane filaments after packaging. The length of the membrane filaments is longer than the central flushing pipe, so the membrane filaments are in a relaxed state.

[0013] Furthermore, the central flushing pipe is a hollow pipe with flushing holes arranged thereon. The flushing holes are evenly distributed throughout the central flushing pipe, and the hole diameter is The spacing between flushing holes is 150 to 200 mm. One end of the central flushing pipe is connected to the flushing water inlet and can be extended to connect to the flushing water pipeline. The other end is closed and fixed to the upper packaging plate.

[0014] The beneficial effects are: 1. The utility model has a unique design of a low-energy self-cleaning MBR sewage treatment device. It adopts the reflux pump required in the MBR process as the power to flush the membrane filaments, and eliminates the process of air scrubbing of the membrane filaments by compressed air aeration. This design reduces the air supply of the blower, reduces the blower power, and saves electricity costs. The membrane filaments are cleaned with flushing water. Compared with the increased air washing intensity, the membrane filament cleaning effect is better, so the membrane filament backwashing time is extended. The use of a self-cleaning MBR sewage treatment device can greatly reduce the operating cost of the MBR system.

[0015] 2. It can be understood that the low-energy self-cleaning MBR sewage treatment device of the utility model cancels the air scrubbing step in the conventional MBR process, that is, cancels the standard blower, and adopts a reflux circulation pump (digestate circulation pump) as the power to hydraulically flush the membrane fibers. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the novel.

[0017] Figure 2 It is a three-dimensional cross-sectional structural schematic diagram of the MBR pool, aerobic pool and blower of the utility model.

[0018] Figure 3 It is a three-dimensional cross-sectional structural schematic diagram of the pressure sensor, water production flow meter and backwash water pump of the utility model.

[0019] Figure 4 It is a three-dimensional cross-sectional structural schematic diagram of the membrane wire, the lower packaging plate and the water outlet of the utility model.

[0020] Among them, the above-mentioned drawings include the following figure marks: 1. anoxic tank, 2. aerobic tank, 3. MBR tank, 4. clean water tank, 5. self-cleaning MBR component, 6. reflux pump, 7. water production suction pump, 8. backwash water pump, 9. aeration plate, 10. blower, 11. air control valve, 12. water production flow meter, 13. water production control electric valve, 14. backwash control electric valve, 15. pressure sensor, 16. hose, 17. pipeline, 18. membrane wire, 19. lower packaging plate, 20. upper packaging plate, 21. water production port, 22. flushing water inlet, 23. central flushing pipe, 24. flushing hole. DETAILED DESCRIPTION

[0021] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for the convenience of description, only the parts related to the utility model are shown in the accompanying drawings.

[0022] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] Please refer to Figure 1-Figure 4 The utility model includes an anoxic tank 1, an anoxic tank, 2, an aerobic tank, 3, an MBR tank, 4, a clean water tank, 5, a self-cleaning MBR component, 6, a reflux pump, 7, a water production suction pump, 8, a backwash water pump, 9, an aeration plate, 10, a blower, 11, an air control valve, 12, a water production flow meter, 13, a water production control electric valve, 14, a backwash control electric valve, 15, a pressure sensor, 16, a hose, 17, a pipeline, 18, a membrane wire, 19, a lower packaging plate, 20, an upper packaging plate, 21, a water production port, 22, a flushing water inlet, 23, a central flushing pipe, and 24, a flushing hole.

[0024] Embodiment 1: This embodiment is used for a containerized MBR sewage treatment device having a treatment capacity of 100 m3 / d. The device dimensions are: length 7.0 m (along the length direction of the container) × width 2.3 m × height 2.8 m, designed effective water depth 2.6 m, effective volume 41.86 m3, designed total residence time HRT = 10 h, designed activated sludge suspended solids average concentration 5000 mg / L (MLSS), and mixed liquor reflux ratio R = 300%.

[0025] A low-energy self-cleaning MBR membrane sewage treatment device according to this embodiment is shown in FIG. Figure 1 and Figure 2 , where the anoxic pool 1 is 2m long, the aerobic pool 2 is 3m long, the MBR pool 3 is 2m long, and the total length is 7m. The flux of the self-cleaning MBR component 5 is 18L / m3h, the flow of the reflux pump 6 is 17.0m3 / h, the flow of the water production suction pump 7 is 6.0m3 / h, the flow of the backwash water pump 8 is 10.0m3 / h, and the air volume of the blower 10 under the standard condition of 30KPa is 1.38m3 / min (the pump head in this example is adjusted according to the actual situation, which is not reflected here).

[0026] The anoxic pool 1, aerobic pool 2 and MBR pool 3 are made as a whole, separated by a partition in the middle. The partition in the middle of the anoxic pool and the aerobic pool is reserved. The water hole, the aerobic pool leads to the MBR pool by the reflux pump 6 for transportation. The reflux pump transports the liquid and flows out through the flushing hole 24 of the central flushing pipe 23 of the self-cleaning MBR assembly 5 in the MBR pool. The MBR pool is provided with a reflux pipe to the anoxic pool and the aerobic pool. The excess liquid in the MBR pool flows back to the anoxic pool and the aerobic pool through the reflux pipe. When the reflux liquid transported by the reflux pump is released through the flushing hole, the membrane filaments are flushed. In this embodiment, the reflux pump is used to transport the reflux liquid to flush the membrane filaments instead of the blower delivering compressed air to air wash or air scrub the membrane filaments. The water production suction pump 7 is connected to the self-cleaning MBR assembly through a pipeline and a connecting hose. The pressure sensor 15 and the water production control electric valve 13 are installed on the water inlet pipeline of the water production suction pump. The water production flowmeter 12 is installed on the water outlet pipeline of the water production suction pump. The water discharged from the water production suction pump flows into the clean water pool. The backwash pump 8 is connected to the self-cleaning MBR assembly through a pipeline and a connecting hose. The pressure sensor 15 and the backwash control electric valve 14 are installed on the backwash pump outlet pipe, and the backwash pump inlet pipe is connected to the clean water tank. The blower 10 compresses air and sends it to the aeration plate 9 of the aerobic tank and the MBR tank through the pipeline and the air control valve 11 respectively. The aeration plate releases tiny bubbles to deliver oxygen (DO ≥ 2.0 mg / L) to the aerobic tank and the MBR tank, ensuring aerobic respiration of microorganisms and bacteria in the sewage and efficient water purification.

[0027] See also Figure 4 The self-cleaning MBR component is composed of membrane filaments 18, a lower packaging plate 19, an upper packaging plate 20, a water outlet 21, a flushing water inlet 22, and a central flushing pipe 23.

[0028] See also Figure 4 A flushing hole 24 is provided on the central flushing pipe 23, and the reflux liquid is transported through a pipeline connected to the central flushing pipe and then released from the flushing hole to flush the surrounding membrane wires 18, thereby delaying the fouling of the membrane wires.

[0029] The integrated equipment of this embodiment is installed in a residential area in North China. The data is obtained in spring and summer. After one month of operation, the actual water temperature is 18-26°C, the measured sewage water volume Q=100m3 / d, CODCr=250-430mg / L, SS=150-280mg / L, NH3-N=21-30mg / L, TN=36-41mg / L. The measured water volume of MBR membrane water production is Q=5.3m3 / h, CODCr=28-45mg / L, SS=0-1mg / L, NH3-N=3-4.2mg / L, TN=10mg / L.

[0030] Equipment operation settings:

[0031] The flux of self-cleaning MBR component 5 is 18L / m3h, the reflux pump runs 24 hours a day (1 in use and 1 in reserve), the water production suction pump runs for 8 minutes and pauses for 2 minutes (1 in use and 1 in reserve), the backwash water pump is set to run once every 4 days, each time running for 10 minutes, the blower runs 24 hours a day, and the motor power is 1.5KW.

[0032] According to the operating data for half a year, the equipment is in good operating condition. The equipment selected in this embodiment is basically the same as the conventional MBR system design. The biggest difference is that the conventional 100m3 / d MBR system selects a blower air volume of 3.47 to 6.94m3 / min, and the corresponding power is between 4 and 7.5KW. This embodiment adopts the self-cleaning MBR component of this patent, and the aeration supply does not need to be used for membrane silk air scrubbing, so the blower air volume is 1.38m3 / min, and the corresponding power is 1.5KW. The use of the self-cleaning MBR component of this patent can save 2.5 to 6KW of power. The industrial electricity is calculated at 1 yuan / kWh. The use of the self-cleaning MBR component of this patent can save 2.5 to 6Kw×24h×1 yuan / Kwh=60 to 144 yuan per day. It can save 20,000 to 50,000 yuan per year.

[0033] In this embodiment, the reflux pump is used to deliver reflux liquid to wash the membrane filaments instead of the blower delivering compressed air to wash or scrub the membrane filaments. Therefore, the air delivery volume of the blower is reduced, the power of the blower is reduced, and energy saving can be greatly achieved.

[0034] Example 2: This example is used for the transformation of a municipal sewage treatment plant with a treatment capacity of 5000m3 / d. The original facilities remain unchanged, and a self-cleaning MBR component unit is added to upgrade the municipal sewage treatment plant. The original reflux pump is removed and a mixed liquor reflux pump is added to make the MBR pool reflux ratio reach R=350%.

[0035] Equipment operation settings:

[0036] Add 4 containers (dimensions: length × width × height: 13m × 3m × 3m), the membrane flux of the self-cleaning MBR module is 20L / m3h, and an aeration plate is installed at the bottom of the container.

[0037] Add 5 mixed liquid reflux pumps, Q=180m3 / h, H=15m, (4 in use and 1 in reserve),

[0038] Add 2 Roots blowers, Q=15m3 / min, P=30KPa, W=15KW (1 for use and 1 for backup),

[0039] Add 3 suction pumps, Q=150m3 / h, H=20m, (2 for use and 1 for standby),

[0040] Add 2 backwash pumps, Q=300m3 / h, H=25m, (1 for use and 1 for backup),

[0041] Add 1 set of chemical cleaning system,

[0042] The mixed liquor return pump of the original system was cancelled and the secondary sedimentation tank was changed into a sludge thickening tank.

[0043] In this embodiment, the municipal sewage treatment plant reconstruction adopts a self-cleaning MBR assembly, and the suction pump, backwash pump, and chemical washing system used are the same as those of the conventional MBR membrane assembly, so the power of the same parts is not compared.

[0044] The conventional MBR system used in the municipal sewage treatment plant renovation increases aeration by 70m3 / min (aeration is mainly used for membrane fiber air scrubbing) and increases the blower power by about 75KW. In fact, the aeration blower power of the self-cleaning MBR component used in this project is only 15KW (aeration is used for mixing the mixed liquid in the MBR pool), which can save 60KW compared with the conventional MBR system. Calculated at 1 yuan / kWh for industrial electricity, the use of this patented self-cleaning MBR component can save 1,440 yuan per day. It can save 520,000 yuan per year.

[0045] In the description of this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0046] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A low-energy self-cleaning MBR sewage treatment device, characterized in that: It includes an anoxic tank (1), an aerobic tank (2), an MBR tank (3), a clean water tank (4), a self-cleaning MBR component (5), an aeration system, a reflux pump (6), a water production system and a backwash system; Water from the regulating tank is connected to the water inlet of the anoxic tank (1) through a pipeline. The anoxic tank (1) is connected to the aerobic tank (2). A reflux pump (6) and an aeration disk (9) are arranged in the aerobic tank (2). A self-cleaning MBR component (5) and an aeration system are arranged in the MBR tank (3). The reflux pump (6) is connected to the self-cleaning MBR component (5). Air for the aeration disk (9) and the aeration system is provided by a blower (10). The self-cleaning MBR component (5) is connected to a water production system and a backwashing system. The water production system and the backwashing system are connected to a clean water tank (4).

2. A low-energy self-cleaning MBR sewage treatment device as claimed in claim 1, characterized in that: The blower (10) compresses air and transports the air to the aerobic tank (2), the aeration plate (9) and the self-cleaning MBR assembly (5) through the pipeline. The compressed air is released to the aerobic tank (2) through the aeration plate (9), and the compressed air is also released to the MBR tank (3) through the self-cleaning MBR assembly (5).

3. A low-energy self-cleaning MBR sewage treatment device as claimed in claim 1, characterized in that: The water production system comprises a hose connected to the self-cleaning MBR component (5), a pressure sensor (15), a water production control electric valve (13), a water production suction pump (7), and a water production flow meter (12); the water production suction pump (7) is connected to the self-cleaning MBR component (5) through pipes, pipe fittings, and valves; the pressure sensor (15) and the water production control electric valve (13) are installed on the water inlet pipe of the water production suction pump (7); the water production flow meter (12) is installed on the water outlet pipe of the water production suction pump (7); and the water production suction pump (7) is connected to the self-cleaning MBR component (5) and the clean water tank (4).

4. A low-energy self-cleaning MBR sewage treatment device as claimed in claim 1, characterized in that: The backwash system comprises a hose connected to the self-cleaning MBR component (5), a pressure sensor (15), a backwash control electric valve (14) and a backwash water pump (8). The pressure sensor (15) and the backwash control electric valve (14) are on the outlet pipe of the backwash water pump (8). The backwash water pump (8) is connected to the self-cleaning MBR component (5) and the clean water tank (4).

5. A low-energy self-cleaning MBR sewage treatment device as claimed in claim 1, characterized in that: The self-cleaning MBR component (5) is assembled from a water production port (21), a flushing water inlet (22), a central flushing pipe (23), an upper packaging plate (20), a lower packaging plate (19), membrane filaments (18) and flushing holes (24).

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