CN217016116U - Membrane module automatic cleaning system of marine MBR domestic sewage treatment device - Google Patents
Membrane module automatic cleaning system of marine MBR domestic sewage treatment device Download PDFInfo
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- CN217016116U CN217016116U CN202123012706.4U CN202123012706U CN217016116U CN 217016116 U CN217016116 U CN 217016116U CN 202123012706 U CN202123012706 U CN 202123012706U CN 217016116 U CN217016116 U CN 217016116U
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Abstract
The utility model relates to an automatic membrane component cleaning system of a marine MBR (membrane bioreactor) domestic sewage treatment device, wherein a membrane component is placed in a membrane cabinet, the membrane cabinet is respectively connected with a coagulation-aeration scouring membrane device, a sludge cabinet and an off-line chemical cleaning device through pipelines, and the membrane component is connected with a reverse air washing device and an on-line reverse chemical cleaning device through pipelines; the air pump is connected with the coagulation-aeration scouring membrane device, the reverse air washing device, the online reverse chemical cleaning device and the offline chemical cleaning device through an air distributor; the bottom of the membrane cabinet is provided with a membrane cabinet discharge valve, and the membrane cabinet is provided with a membrane cabinet low liquid level. According to the utility model, organic matters which are easy to block the membrane can be formed into flocs with large particle sizes by a coagulation-aeration scouring membrane surface mode, and the flocs are removed by precipitation in the precipitation cabinet through gas stripping, so that membrane pores are not easy to block, and meanwhile, aeration scouring can utilize bubbles to shake and scour the surface of the membrane element, so that pollutants are not easy to stay on the surface of the membrane element, and the possibility of membrane blocking is reduced.
Description
Technical Field
The utility model relates to an automatic membrane component cleaning system of a sewage treatment device, in particular to an automatic membrane component cleaning system for a marine MBR domestic sewage treatment device.
Background
The development of the membrane separation water treatment technology starts in the fifties of the twentieth century, the scale industrial application of the membrane separation technology starts from the sixties of the twentieth century, and the micro-filtration, ultra-filtration and reverse osmosis membrane separation water treatment technology has been realized in large scale industrial application worldwide by the eighties of the twentieth century. More than 90% of developed countries in Europe and America adopt a biochemical sewage treatment device, Hamworthy company in England in 2000 produces a first ship treatment device and a device for the same by using a membrane bioreactor, and a real ship test is completed in 2001. Then, companies such as the United states, Germany, and China developed domestic sewage treatment apparatuses for ships based on the membrane biochemical method, which satisfy the requirements of the resolution of MEPC.227.
The reduction of permeation flux caused by the pollution of a membrane separation trapped solute accumulated to form a membrane is a main obstacle for the popularization of the water treatment technology of the marine membrane separation, and the reduction of the permeation flux causes the reduction of the production capacity and the production stability. The factors causing membrane fouling in membrane biochemical treatment devices are mainly divided into: particulate matter, soluble organic matter (mainly soluble microbial products, extracellular polymers, microorganisms), inorganic matter in the wastewater. In order to ensure the stable operation of the membrane separation water treatment, the membrane component must be subjected to back washing, chemical cleaning and even membrane component replacement, which all require the operation of a shipman. And inaccurate judgment of the membrane component state by the crew leads to delayed membrane washing, which shortens the service life of the membrane, and increases the operation workload of the crew who cleans the membrane too early.
In land engineering, an aeration fan is often used for scouring the surface of the membrane, so that pollutants are not easy to adhere to the surface of the membrane to reduce the pollution to the membrane. However, in the actual use process of the marine domestic sewage treatment device, in order to ensure that the effluent reaches the standard, the membrane module may be started to be used under the condition that the front-end biochemical operation is not good, and if organic matters and particulate matters causing membrane blockage are not removed, the membrane module is accelerated to be blocked. In the membrane cleaning technology, membrane component permeate liquid is usually used for performing hydraulic backwashing on a membrane component, and the method can obtain a good cleaning effect and save resources. However, the method reduces the final system water yield, and the number of membrane elements needs to be increased under the condition of constant water yield requirement, so that the volume of the device is increased. And the pump is required to be added for reversely acting the produced water on the membrane element, so that the energy consumption and the system complexity are increased. In marine conditions, it is disadvantageous to have as small a device as possible and to simplify the operation.
Disclosure of Invention
The utility model aims to provide an automatic membrane module cleaning system suitable for a marine MBR (membrane bioreactor) domestic sewage treatment device, which can prolong the off-line cleaning period, reduce the frequency of high-concentration off-line chemical membrane cleaning and reduce the workload of operators in the daily working process.
In order to realize the purpose, the technical scheme of the utility model is as follows: a membrane module automatic cleaning system of a marine MBR domestic sewage treatment device comprises a sludge cabinet, an air pump, an air distributor, a membrane cabinet, a membrane module, a coagulation-aeration scouring membrane device, a reverse air washing device, an online reverse chemical cleaning device, an offline chemical cleaning device and an electric control system, wherein the membrane module is placed in the membrane cabinet, the membrane cabinet is respectively connected with the coagulation-aeration scouring membrane device, the sludge cabinet and the offline chemical cleaning device through pipelines, and the membrane module is connected with the reverse air washing device and the online reverse chemical cleaning device through pipelines; the air pump is connected with the coagulation-aeration scouring membrane device, the reverse air washing device, the online reverse chemical cleaning device and the offline chemical cleaning device through an air distributor; the membrane cabinet is characterized in that a membrane cabinet discharge valve is arranged at the bottom of the membrane cabinet, and a membrane cabinet low liquid level, a membrane cabinet middle liquid level and a UV254 sensor are arranged on the membrane cabinet.
Further, the coagulation-aeration scouring membrane device comprises a flocculant medicine box, a medicine feeding pump, an air lifting valve, a gas flowmeter, an air stripper, a membrane aeration valve, a gas flowmeter and a membrane aeration pipe, wherein the flocculant medicine box is connected with the membrane assembly through the medicine feeding pump, and the air inlet end of the air stripper is connected with the gas distributor and the air pump through the gas flowmeter and the air lifting valve; the membrane aeration pipe is arranged at the bottom of the membrane component and is connected with the gas distributor and the gas pump through the gas flowmeter and the membrane aeration valve.
Further, the membrane aeration pipe below the membrane component is a PVC, PVDF or ABS pipe which is inclined downwards at 45 degrees and has 50mm cross open holes at intervals.
Further, the reverse gas washing device comprises a gas backwashing electric valve, a backwashing pipeline and a pressure sensor, wherein the backwashing pipeline is connected with the gas distributor and the gas pump through the gas backwashing electric valve, and the backwashing pipeline is a membrane component water production pipeline.
Further, the on-line reverse chemical cleaning device comprises a chemical back-washing solenoid valve, a back-washing pipeline, a membrane cleaning medicine box, a pressure sensor, a membrane assembly water production electric valve, a suction pump and a liquid flow meter, wherein the back-washing pipeline is connected with the membrane cleaning medicine box through the chemical back-washing solenoid valve and is connected with a gas distributor and an air pump through a gas back-washing electric valve, the back-washing pipeline is connected with a membrane assembly water production pipeline, the membrane assembly water production pipeline is connected with the suction pump through a membrane assembly water production electric valve, the liquid flow meter is arranged at the water outlet of the suction pump, and the pressure sensor is arranged on the membrane assembly water production pipeline.
Further, the off-line chemical cleaning device comprises an off-line chemical cleaning electromagnetic valve and a membrane cleaning medical kit, and the membrane cleaning medical kit is connected with the membrane cabinet through the off-line chemical cleaning electromagnetic valve.
Further, the membrane module is a flexible sheet membrane, a flat sheet membrane or a hollow fiber membrane.
The beneficial effects of the utility model are:
the utility model provides a membrane module automatic cleaning system suitable for a marine MBR (membrane bioreactor) domestic sewage treatment device, which adopts a combined membrane automatic cleaning technology of coagulation-aeration scouring membrane surface, reverse air washing, reverse on-line chemical cleaning and off-line chemical cleaning. Organic matters which are easy to block the membrane can be formed into flocs with large particle size by a mode of washing the surface of the membrane through coagulation and aeration, the flocs are removed by precipitation in a precipitation cabinet through gas stripping, so that membrane pores are difficult to block, and meanwhile, the surface of the membrane element can be shaken and washed by utilizing bubbles in aeration washing, so that pollutants are difficult to stay on the surface of the membrane element, and the possibility of membrane blocking is reduced. The pollutants in the membrane pores are backflushed by utilizing gas backflushing in the pumping interval, so that the pollutants can be blown out of the membrane pores. The chemical back washing of membrane pollution by low-concentration alkaline liquid medicine in the low-peak period of the device can react with the organic pollution in the membrane pores to make the pollutant leave the membrane material. The mode can reduce the dosage of membrane cleaning agents and the off-line chemical cleaning times, improve the utilization rate of the membrane component and simultaneously reduce the workload of operators. The off-line chemical cleaning of the technology of the utility model does not need to detach the membrane module from the domestic sewage treatment device, and can carry out off-line chemical cleaning in situ, thereby reducing the cleaning difficulty.
Drawings
FIG. 1 is a schematic structural view of an automatic membrane module cleaning apparatus according to the present invention;
FIG. 2 is a schematic flow chart of the present invention;
description of the various references in the drawings: 1. the system comprises a sludge cabinet, a flocculant medicine box 2, a flocculant medicine box 3, a medicine feeding pump 4, an air pump 5, an air distributor 6, an air stripping valve 7, an air flow meter 8, an air stripper 9, a membrane aeration valve 10, an air flow meter 11, a membrane aeration pipe 12, an air back flushing electric valve 13, a membrane cleaning medicine box 14, a chemical back flushing electromagnetic valve 15, an off-line chemical cleaning electromagnetic valve 16, a pressure sensor 17, a water production electric valve 18, a suction pump 19, a liquid flow meter 20, a membrane assembly 21, a UV254 sensor 22, an electric control system 23, a membrane cabinet discharge valve 24, a membrane cabinet low liquid level 25 and a membrane cabinet medium liquid level.
Detailed Description
In order to make the advantages and technical solutions of the present invention clearer and clearer, the present invention is described in detail below with reference to specific embodiments.
As shown in fig. 1, the automatic membrane module cleaning system for the marine MBR domestic sewage treatment device provided by the utility model comprises a sludge cabinet 1, an air pump 4, an air distributor 5, a membrane cabinet, a membrane module 20, a coagulation-aeration scouring membrane device, a reverse air washing device, an online reverse chemical cleaning device, an offline chemical cleaning device and an electric control system 23.
The membrane module 20 is placed in the membrane cabinet, the membrane cabinet is respectively connected with the coagulation-aeration scouring membrane device, the sludge cabinet 1 and the off-line chemical cleaning device through pipelines, and the membrane module 20 is connected with the reverse air washing device and the on-line reverse chemical cleaning device through pipelines. The air pump 4 is connected with the coagulation-aeration scouring membrane device, the reverse air washing device, the online reverse chemical cleaning device and the offline chemical cleaning device through an air distributor 5. The bottom of the membrane cabinet is provided with a membrane cabinet discharge valve 23. The membrane cabinet is provided with a membrane cabinet low liquid level 24, a membrane cabinet middle liquid level 25 and a UV254 sensor 21.
The coagulation-aeration scouring membrane device comprises a flocculant medicine box 2, a medicine feeding pump 3, a gas stripping valve 6, a gas flowmeter 7, a gas stripper 8, a membrane aeration valve 9, a gas flowmeter 10 and a membrane aeration pipe 11. The flocculant medicine box 2 is connected with the membrane component 20 through the medicine adding pump 3, and coagulant is added into the membrane box through the medicine adding pump 3 to coagulate granular substances and soluble organic matters in the sewage into macromolecular substances. The air inlet end of the air stripper 8 is connected with the air distributor 5 and the air pump 4 through an air flow meter 7 and an air stripping valve 6. The mixed liquid of the flocs and the sewage in the membrane tank is lifted to a sludge tank 1 by a stripper 8 according to a certain reflux ratio for precipitation, so that the concentration of the mixed liquid of the flocs and the sewage is reduced. The membrane aeration pipe 11 is arranged at the bottom of the membrane component 20 and is connected with the gas distributor 5 and the air pump 4 through the gas flowmeter 10 and the membrane aeration valve 9, the membrane surface is aerated and washed in the normal use process of the membrane component, so that pollutants are not easy to adhere to the membrane surface, gas backwashing is carried out in the pumping intermittent process, the pollutants in membrane holes are backflushed to wash out the membrane holes, the membrane holes are recovered to be normal, membrane blockage is reduced, and the service life of the membrane is prolonged.
The reverse gas washing device comprises a gas back washing electric valve 12 and a back washing pipeline. The back washing pipeline is connected with the air distributor 5 and the air pump 4 through an air back washing electric valve 12. Wherein the back flushing pipeline is a membrane component water production pipeline.
The on-line reverse chemical cleaning device comprises a chemical back-flushing electromagnetic valve 14, a back-flushing pipeline, a membrane cleaning medicine box 13, a pressure sensor 16, a membrane component water production electric valve 17, a suction pump 18 and a liquid flow meter 19. The backwashing pipeline is connected with the membrane cleaning medicine box 13 through a chemical backwashing electromagnetic valve 14, is connected with the gas distributor 5 and the air pump 4 through a gas backwashing electric valve 12, is connected with the membrane component water production pipeline, is connected with the suction pump 18 through a membrane component water production electric valve 17, is provided with a liquid flowmeter 19 at the water outlet of the suction pump 18, and is provided with a pressure sensor 16 on the membrane component water production pipeline.
The off-line chemical cleaning device comprises an off-line chemical cleaning electromagnetic valve 15 and a membrane cleaning medicine box 13. The membrane cleaning medicine box 13 is connected with the membrane cabinet through an off-line chemical cleaning electromagnetic valve 15.
Preferably, the membrane module 20 is a flexible sheet membrane, a flat sheet membrane, or a hollow fiber membrane.
Preferably, the source of gas is a plant configured with gas pumps or compressed air supplied on board the vessel.
Preferably, under normal working conditions, the pressure of the membrane module 20 is less than-0.045 Mpa in a set constant flow state, and the start and stop of the membrane module 20 are controlled by the start-stop and low-stop ratio and the suction pump start-stop ratio in the control of the membrane cabinet liquid level meter.
Preferably, the low liquid level of the membrane tank needs to be 200mm higher than the height of the membrane component, and the medium liquid level of the membrane tank needs to be 500mm higher than the low liquid level of the membrane tank.
Preferably, the membrane module is started or stopped preferentially by the liquid level control of the membrane cabinet.
Preferably, the membrane aeration pipe below the membrane component is a PVC, PVDF or ABS pipe with cross open holes which are inclined downwards at 45 degrees and have 50mm intervals.
As shown in fig. 2, the membrane module automatic cleaning method of the marine MBR domestic sewage treatment device adopts the membrane module automatic cleaning system of the utility model, and comprises four methods of coagulation-aeration scouring membrane surface, reverse air washing, reverse online chemical cleaning and offline chemical cleaning, and comprises the following specific steps:
1) in normal work, a coagulant is added into the membrane cabinet by a dosing pump 3 to coagulate organic matters in the sewage, and a mixture of flocs and sewage is lifted to a sludge cabinet 1 by a gas stripping device 8 according to a certain reflux ratio to be precipitated;
2) in normal work, a coagulation-aeration scouring membrane device is adopted to carry out gas scouring cleaning on the surface of the membrane component 20;
3) in normal operation, after the suction pump 18 is started and stopped for a certain number of times, the membrane module 20 is reversely air-washed by the reverse air-washing device;
4) when the pressure of the pressure sensor 16 reaches a set value, an online reverse chemical cleaning device is adopted to perform online reverse chemical cleaning on the membrane component 20 in a low-peak period of the system use;
5) and in a set time period, when the frequency of the pressure sensor 16 reaching the set value exceeds the set value, performing off-line chemical cleaning on the membrane module 20 by using an off-line chemical cleaning device.
Preferably, the coagulant in step 1) is a coagulant such as PAC. The reflux ratio of the mixed liquid is 0-300%, and the reflux ratio is specifically controlled by a gas flowmeter.
Preferably, the step 2) of gas scouring and cleaning the membrane surface by using gas is realized by arranging an aeration pipeline below the membrane component to scour and clean the membrane surface by using gas at a certain gas flow rate. Wherein, the gas flow rate required by the unit membrane area is 8L/m2, and is specifically controlled by a gas flow meter.
Preferably, the reverse gas washing in the step 3) is realized in a manner that the start-stop time of the suction pump is 4min for 1.5min, gas backwashing is performed every 30 times, a backwashing pipeline is a membrane component water production pipeline, the backwashing time is 1min10s, and the backwashing pressure is less than 0.025 Mpa. And when gas backwashing is carried out, the chemical backwashing electromagnetic valve and the water production electromagnetic valve need to be closed.
Preferably, after the pressure of the pressure sensor 16 in the step 4) reaches a set value of-0.045 Mpa, performing online reverse chemical cleaning for 2 hours by using a sodium hypochlorite solution with the effective chlorine content of 3 ten thousandths at 12 nights to 4 times in the low peak period of the system;
preferably, the online reverse chemical cleaning in step 4) is implemented by closing the membrane module water production electric valve, closing the membrane module aeration valve, closing the gas stripping valve, opening the chemical back-flushing electromagnetic valve, reversely flowing an alkaline chemical cleaning agent with a certain concentration into the membrane element along the membrane module water production pipeline, and closing the chemical back-flushing electromagnetic valve when the pressure of the pressure sensor is 0.020 Mpa. After soaking for 2 hours, the membrane module water production electric valve is opened, the suction pump is started, chemical agents in the membrane module are pumped out and discharged, and the suction pump is stopped after the liquid level of the membrane cabinet reaches a low level. And after the on-line reverse chemical cleaning is finished, the membrane module is recovered to be in a normal working mode.
Preferably, the alkaline chemical cleaning agent is sodium hypochlorite, and the available chlorine content is 3 ten-thousandth.
Preferably, the set condition in the step 5) is that the membrane module needs to be chemically cleaned off line within 7 days after the pressure of the pressure sensor reaches a set value of-0.045 Mpa for the first time and the number of times that the pressure of the pressure sensor reaches-0.045 Mpa is 3 times.
Preferably, the off-line chemical cleaning in the step 5) is realized in a way that the domestic sewage treatment device stops running. And (5) carrying out chemical back cleaning on the membrane component in the step (4), after the back cleaning is finished, opening an off-line chemical cleaning electromagnetic valve, and putting the prepared chemical agent into a membrane cabinet to soak the membrane component. Firstly, soaking for 2 hours by using acid liquor, then discharging liquid in the membrane cabinet, and then soaking for 2 hours by using alkali liquor, and then discharging the liquid in the membrane cabinet. And after the off-line reverse chemical cleaning is finished, the recovery device and the membrane module are in a normal working mode.
Preferably, the acid solution is one or more mixed solutions of citric acid and oxalic acid, and the pH is controlled to be 2-3 in consideration of the storage condition for the ship. The alkali liquor is sodium hypochlorite solution with one percent of effective concentration.
Claims (7)
1. The utility model provides a marine MBR domestic sewage treatment plant's membrane module self-cleaning system which characterized in that: the device comprises a sludge cabinet, an air pump, an air distributor, a membrane cabinet, a membrane assembly, a coagulation-aeration scouring membrane device, a reverse air washing device, an online reverse chemical cleaning device, an offline chemical cleaning device and an electric control system, wherein the membrane assembly is placed in the membrane cabinet, the membrane cabinet is respectively connected with the coagulation-aeration scouring membrane device, the sludge cabinet and the offline chemical cleaning device through pipelines, and the membrane assembly is connected with the reverse air washing device and the online reverse chemical cleaning device through pipelines; the air pump is connected with the coagulation-aeration scouring membrane device, the reverse air washing device, the online reverse chemical cleaning device and the offline chemical cleaning device through an air distributor; the membrane cabinet bottom is equipped with the membrane cabinet blow-down valve, be equipped with membrane cabinet low liquid level, liquid level and UV254 sensor in the membrane cabinet on the membrane cabinet.
2. The system for automatically cleaning a membrane module of a marine MBR domestic sewage treatment unit according to claim 1, characterized in that: the coagulation-aeration membrane washing device comprises a flocculant medicine box, a medicine feeding pump, an air lifting valve, a gas flowmeter, an air stripper, a membrane aeration valve, a gas flowmeter and a membrane aeration pipe, wherein the flocculant medicine box is connected with a membrane component through the medicine feeding pump, and the air inlet end of the air stripper is connected with an air distributor and an air pump through the gas flowmeter and the air lifting valve; the membrane aeration pipe is arranged at the bottom of the membrane component and is connected with the gas distributor and the gas pump through the gas flowmeter and the membrane aeration valve.
3. The automatic membrane module cleaning system for the marine MBR domestic sewage treatment device according to claim 2, characterized in that: the membrane aeration pipe below the membrane component is a PVC, PVDF or ABS pipe which is inclined downwards at 45 degrees and has 50mm cross open holes at intervals.
4. The system for automatically cleaning a membrane module of a marine MBR domestic sewage treatment unit according to claim 1, characterized in that: the reverse gas washing device comprises a gas backwashing electric valve, a backwashing pipeline and a pressure sensor, wherein the backwashing pipeline is connected with a gas distributor and a gas pump through the gas backwashing electric valve, and the backwashing pipeline is a membrane component water production pipeline.
5. The automatic membrane module cleaning system of the marine MBR domestic sewage treatment device according to claim 1, characterized in that: the on-line reverse chemical cleaning device comprises a chemical back-washing solenoid valve, a back-washing pipeline, a membrane cleaning medicine box, a pressure sensor, a membrane assembly water production electric valve, a suction pump and a liquid flowmeter, wherein the back-washing pipeline is connected with the membrane cleaning medicine box through the chemical back-washing solenoid valve and is connected with a gas distributor and a gas pump through a gas back-washing electric valve, the back-washing pipeline is connected with a membrane assembly water production pipeline, the membrane assembly water production pipeline is connected with the suction pump through the membrane assembly water production electric valve, the liquid flowmeter is arranged at a water outlet of the suction pump, and the pressure sensor is arranged on the membrane assembly water production pipeline.
6. The system for automatically cleaning a membrane module of a marine MBR domestic sewage treatment unit according to claim 1, characterized in that: the off-line chemical cleaning device comprises an off-line chemical cleaning electromagnetic valve and a membrane cleaning medical kit, and the membrane cleaning medical kit is connected with the membrane cabinet through the off-line chemical cleaning electromagnetic valve.
7. The system for automatically cleaning a membrane module of a marine MBR domestic sewage treatment unit according to claim 1, characterized in that: the membrane component is a soft sheet membrane, a flat sheet membrane or a hollow fiber membrane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123012706.4U CN217016116U (en) | 2021-12-02 | 2021-12-02 | Membrane module automatic cleaning system of marine MBR domestic sewage treatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123012706.4U CN217016116U (en) | 2021-12-02 | 2021-12-02 | Membrane module automatic cleaning system of marine MBR domestic sewage treatment device |
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| CN217016116U true CN217016116U (en) | 2022-07-22 |
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| CN202123012706.4U Active CN217016116U (en) | 2021-12-02 | 2021-12-02 | Membrane module automatic cleaning system of marine MBR domestic sewage treatment device |
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2021
- 2021-12-02 CN CN202123012706.4U patent/CN217016116U/en active Active
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