CN111054218A - Green and rapid cleaning device and cleaning method for flat ceramic membrane - Google Patents
Green and rapid cleaning device and cleaning method for flat ceramic membrane Download PDFInfo
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- CN111054218A CN111054218A CN201911268744.0A CN201911268744A CN111054218A CN 111054218 A CN111054218 A CN 111054218A CN 201911268744 A CN201911268744 A CN 201911268744A CN 111054218 A CN111054218 A CN 111054218A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/04—Backflushing
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/20—By influencing the flow
- B01D2321/2066—Pulsated flow
- B01D2321/2075—Ultrasonic treatment
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Abstract
The invention discloses a green rapid cleaning device and a cleaning method for a flat ceramic membrane, relates to the technical field of water treatment, and solves the problems of low membrane flux recovery rate, soaking by using a chemical agent, long cleaning time and the like of the conventional cleaning method for the ceramic membrane. A green rapid cleaning device for a flat ceramic membrane comprises an ultrasonic wave generating device and an ultrafiltration membrane component which are arranged in an ultrafiltration membrane tank, wherein an aeration pipe is arranged in the ultrafiltration membrane tank below the ultrafiltration membrane component, the aeration pipe is connected with a fan through a pipeline provided with an air inlet valve, a backwashing pipe is arranged above the ultrafiltration membrane component, and the backwashing pipe is connected with a clean water tank through a pipeline provided with a backwashing valve and a backwashing pump; the overflow pipe is seted up on ultrafiltration membrane pond side top, and the blow off pipe has been seted up to the side bottom, and the overflow pipe is connected with the equalizing basin respectively with the blow off pipe. The invention solves the problems of low membrane flux recovery rate, long cleaning time and the like when the mine water is treated by utilizing a flat ceramic membrane, and the mine water treatment efficiency can be obviously improved by using a chemical agent for soaking.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a green rapid cleaning device and a cleaning method for a flat ceramic membrane.
Background
A large amount of mine water is generated in the coal mine exploitation and excavation process, and the mine water contains a large amount of impurities such as rock dust, coal dust and the like and also contains a small amount of organic matters and microorganisms. At present, the mine water is mainly treated by adopting a coagulating sedimentation and filtering process. However, with the increasing environmental protection situation, the government of China also puts forward higher discharge standards for the treatment of mine wastewater. In order to ensure that the discharged mine water stably reaches the standard, the water passing through the original treatment system is subjected to advanced treatment so as to further reduce the content of suspended substances and pollutants in the discharged water and finally reach a new discharge standard.
The inorganic ceramic membrane is an inorganic material with a special selective separation function, and the membrane separation technology is widely applied to the fields of medicine, water treatment, chemical industry, electronics, food processing and the like due to the characteristics of high efficiency, energy conservation, environmental protection, molecular level filtration and the like, and becomes one of the most important technologies in the separation science of the century. However, in the process of treating the coal mine water, along with the prolonging of the service time, fine coal powder and rock dust which are not subjected to coagulating sedimentation in the coal mine water can enter the pore channels of the ceramic membrane, so that the ceramic membrane is blocked to different degrees, and the water production efficiency of the system is influenced. When the traditional chemical agent soaking mode is adopted for cleaning, different agents are required to soak the ultrafiltration membrane for 3-5 hours or more, and even the membrane flux can be recovered to 60-70% of the initial membrane flux. The chemical agent is used for soaking, so that not only can secondary pollution of water be caused, but also the production time is prolonged, and the normal operation of the whole water treatment system is seriously influenced. Therefore, an apparatus and method for cleaning ceramic membranes rapidly and efficiently must be sought. The invention designs and assembles a set of green and efficient flat ceramic membrane cleaning device, which is not suitable for any chemical agent in the cleaning process, avoids secondary pollution to water, greatly shortens the cleaning time and improves the production efficiency.
Therefore, how to solve the factors restricting the application of the inorganic ceramic membrane in the treatment of the water of the mining machine and realize the green and high-efficiency cleaning of the inorganic ceramic membrane is a technical problem which is urgently needed to be solved in the field at present.
Disclosure of Invention
The invention aims to provide a green rapid cleaning device and a cleaning method for a flat ceramic membrane, and solves the problems of low membrane flux recovery rate, soaking by using a chemical agent, long cleaning time and the like of the conventional cleaning method for the ceramic membrane.
The invention is realized by the following technical scheme:
the green rapid cleaning device for the flat ceramic membrane comprises an ultrasonic wave generating device and an ultrafiltration membrane assembly which are arranged in an ultrafiltration membrane tank, wherein an aeration pipe is arranged in the ultrafiltration membrane tank below the ultrafiltration membrane assembly, the aeration pipe is connected with a fan through a pipeline provided with an air inlet valve, a backwashing pipe is arranged above the ultrafiltration membrane assembly, and the backwashing pipe is connected with a clean water tank through a pipeline provided with a backwashing valve and a backwashing pump; the overflow pipe is arranged at the top end of the side surface of the ultrafiltration membrane pool, the blow-off pipe provided with a blow-off valve is communicated with the bottom of the side surface, and the overflow pipe and the blow-off pipe are respectively connected with the regulating pool.
Furthermore, the ultrasonic wave generating device comprises an ultrasonic wave generator and a frequency current adjusting device, the ultrasonic frequency and the working current are adjustable, the ultrasonic wave generating device is arranged on the side wall of the membrane pool, and dirt in the pore channel and on the surface of the flat ceramic membrane is loosened through the ultrasonic cavitation.
And ultrasonic wave generating devices are arranged on the peripheral side wall of the ultrafiltration membrane pool.
The overflow pipe is arranged at the position 20cm away from the top end of the side surface of the ultrafiltration membrane pool.
The sewage discharge pipe is arranged at the position 10cm away from the tank bottom on the side surface of the ultrafiltration membrane tank.
The ultrafiltration membrane component is a flat ceramic membrane.
Furthermore, the invention also provides a green and efficient cleaning method for the flat ceramic membrane by using the device, which comprises the following steps:
(1) starting an ultrasonic generating device, adjusting ultrasonic frequency, working current and working time, and carrying out ultrasonic work on the ultrafiltration membrane component;
(2) after the ultrasonic treatment is finished, starting aeration, firstly opening an air inlet valve, then opening a fan, and starting aeration from the bottom of the ultrafiltration membrane pool by an aeration pipe;
(3) aerating and communicating with a drain pipe at the same time, and enabling the sewage in the ultrafiltration membrane tank to flow to the regulating tank through the drain pipe;
(4) and after the sewage is completely discharged, closing the drain valve, opening the backwashing valve and the backwashing pump to start backwashing, and flushing the inside of the ceramic membrane by clean water to the outside so as to completely remove the dirt blocked in the pore passage of the ceramic membrane and finish the cleaning of the ceramic membrane.
The ultrasonic wave generating device comprises an ultrasonic wave generator and a frequency current adjusting device, the ultrasonic frequency and the working current are adjustable, the ultrasonic wave generating device is arranged on the side wall of a membrane pool, and dirt in a pore channel and on the surface of a flat ceramic membrane is loosened through the ultrasonic cavitation; the fan is communicated with the aeration pipe through an air inlet valve and is used for generating air flow to wash dirt on the surface of the flat ceramic membrane; the backwashing pump is connected with the clean water tank and used for pumping clean water into the ceramic membrane internal channel, so that the clean water flows back from the interior of the ceramic membrane channel to the exterior of the ceramic membrane under the action of the pressure of the backwashing pump, dirt blocked in the ceramic membrane channel is thoroughly removed, and the ceramic membrane channel is dredged; when the water inflow speed is greater than the water production speed, the overflow pipe overflows the redundant inflow to the front end regulating reservoir, the overflow of the ultra-filtration membrane pool above the water level is avoided, and the drain valve is installed at the bottom of the side surface of the ultra-filtration membrane pool and is used for discharging the sewage and the overflow water in the membrane pool to the front end regulating reservoir.
The invention solves the problems of low membrane flux recovery rate, long cleaning time and the like when the mine water is treated by utilizing a flat ceramic membrane, and the mine water treatment efficiency can be obviously improved by using a chemical agent for soaking.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a graph of the effect of sonication time on membrane flux;
FIG. 3 is a graph of the effect of ultrasonic cleaning device current on membrane flux;
figure 4 is a graph of the effect of backwash time and ultrasound on membrane flux.
In the figure: 1-an ultrafiltration membrane pool, 2-an ultrafiltration membrane component, 3-an ultrasonic generating device, 4-an air inlet valve, 5-a fan, 6-a drain pipe, 7-a backwashing valve, 8-a backwashing pump, 9-an overflow pipe and 10-an aeration pipe.
Detailed Description
Example 1
The green rapid cleaning device for the flat ceramic membrane comprises an ultrasonic generating device 3 and an ultrafiltration membrane component 2 which are arranged in an ultrafiltration membrane pool 1, wherein an aeration pipe 10 is arranged in the ultrafiltration membrane pool 1 below the ultrafiltration membrane component 2, the aeration pipe 10 is connected with a fan 5 through a pipeline provided with an air inlet valve 4, a backwashing pipe is arranged above the ultrafiltration membrane component 2, and the backwashing pipe is connected with a clean water pool through a pipeline provided with a backwashing valve 4 and a backwashing pump 8; an overflow pipe 9 is arranged at the top end of the side surface of the ultrafiltration membrane tank 1, a blow-off pipe 6 provided with a blow-off valve is communicated with the bottom of the side surface, and the overflow pipe 9 and the blow-off pipe 6 are respectively connected with the regulating tank.
The green efficient cleaning method for the flat ceramic membrane by using the device comprises the following steps:
(1) starting an ultrasonic generating device, adjusting ultrasonic frequency, working current and working time, and carrying out ultrasonic work on the ultrafiltration membrane component;
(2) after the ultrasonic treatment is finished, starting aeration, firstly opening an air inlet valve, then opening a fan, and starting aeration from the bottom of the ultrafiltration membrane pool by an aeration pipe;
(3) aerating and communicating with a drain pipe at the same time, and enabling the sewage in the ultrafiltration membrane tank to flow to the regulating tank through the drain pipe;
(4) and after the sewage is completely discharged, closing the drain valve, opening the backwashing valve and the backwashing pump to start backwashing, and flushing the inside of the ceramic membrane by clean water to the outside so as to completely remove the dirt blocked in the pore passage of the ceramic membrane and finish the cleaning of the ceramic membrane.
In specific implementation, the mine water from the No. 1 coal mine enters an ultrafiltration system for filtration after coagulating sedimentation, and the initial membrane flux is 45.8 m3H (design flux 50.0 m)3H), the membrane flux is reduced to 35.0 m after 36 h of operation3At the moment, cleaning the ceramic membrane; firstly, starting an ultrasonic cleaning device with the frequency of 40 MHz and the working current of 15A, closing the ultrasonic cleaning device after 10 minutes of ultrasound, sequentially opening an air inlet valve and a fan to start aeration, simultaneously opening a drain valve to discharge sewage in an ultrafiltration membrane tank to a front end regulating tank, closing the drain valve after the sewage is discharged, and finally, carrying out ultrasonic cleaning according to the sequenceOpening a backwashing valve and a backwashing pump for backwashing, finishing backwashing for 4 min, and continuing the whole process for 18 min; the membrane flux is restored to 45.6 m3The effluent quality meets the III-class standard of the surface water environment quality; in the daily use process, the flat ceramic membrane ultrafiltration system is cleaned once a day and continuously operated for 127 days, and the membrane flux is always maintained at 44.5 +/-1.6 m3In the range of/h.
Example 2
The green rapid cleaning device for the flat ceramic membrane comprises an ultrasonic generating device 3 and an ultrafiltration membrane component 2 which are arranged in an ultrafiltration membrane pool 1, wherein an aeration pipe 10 is arranged in the ultrafiltration membrane pool 1 below the ultrafiltration membrane component 2, the aeration pipe 10 is connected with a fan 5 through a pipeline provided with an air inlet valve 4, a backwashing pipe is arranged above the ultrafiltration membrane component 2, and the backwashing pipe is connected with a clean water pool through a pipeline provided with a backwashing valve 4 and a backwashing pump 8; an overflow pipe 9 is arranged at the position, 20cm away from the top end, of the side surface of the ultrafiltration membrane tank 1, a blow-off pipe 6 provided with a blow-off valve is communicated with the bottom of the side surface, and the overflow pipe 9 and the blow-off pipe 6 are respectively connected with the regulating tank.
In specific implementation, the mine water from the No. 2 coal mine enters an ultrafiltration system for filtration after coagulating sedimentation, and the initial membrane flux is 43.6 m3H (design flux 50.0 m)3H), the membrane flux decreased to 35.0 m after 29 h of operation3At the moment, cleaning the ceramic membrane;
firstly, starting an ultrasonic cleaning device, wherein the frequency is 30 MHz, the working current is 12A, the ultrasonic cleaning device is closed after 20 min of ultrasonic treatment, an air inlet valve and a fan are sequentially opened to start aeration, a blow-down valve is simultaneously opened to discharge sewage in an ultrafiltration membrane pool to a front end regulating tank, the blow-down valve is closed after the sewage is completely discharged, a backwashing valve and a backwashing pump are sequentially opened to start backwashing, the backwashing is finished for 4 min, and the whole process lasts for 28 min; the membrane flux is restored to 42.7 m3The effluent quality meets the III-class standard of the surface water environment quality; in the daily use process, the flat ceramic membrane ultrafiltration system is cleaned once a day and continuously operated for 114 days, and the membrane flux is always maintained at 43.1 +/-1.4 m3In the range of/h.
Example 3
The green rapid cleaning device for the flat ceramic membrane comprises an ultrasonic wave generating device 3 and an ultrafiltration membrane component 2 which are arranged in an ultrafiltration membrane pool 1, wherein the ultrafiltration membrane component 2 is the flat ceramic membrane, an aeration pipe 10 is arranged in the ultrafiltration membrane pool 1 below the ultrafiltration membrane component 2, the aeration pipe 10 is connected with a fan 5 through a pipeline provided with an air inlet valve 4, a backwashing pipe is arranged above the ultrafiltration membrane component 2, and the backwashing pipe is connected with a clean water pool through a pipeline provided with a backwashing valve 4 and a backwashing pump 8; an overflow pipe 9 is arranged on the side surface of the ultrafiltration membrane tank 1 and is 20cm away from the top end, the bottom of the side surface is communicated with a drain pipe 6 provided with a drain valve, the drain pipe 6 is arranged at the position 10cm away from the tank, and the overflow pipe 9 and the drain pipe 6 are respectively connected with an adjusting tank.
In specific implementation, the mine water from a 3# coal mine enters an ultrafiltration system for filtration after coagulating sedimentation, and the initial membrane flux is 46.3 m3H (design flux 50.0 m)3H), the membrane flux is reduced to 35.0 m after running for 32 h3At the moment, cleaning the ceramic membrane;
firstly, starting an ultrasonic cleaning device, wherein the frequency is 35 MHz, the working current is 10A, closing the ultrasonic cleaning device after ultrasonic treatment is carried out for 25 min, sequentially opening an air inlet valve and a fan to start aeration, simultaneously opening a blow-down valve, discharging sewage in an ultrafiltration membrane pool to a front end regulating tank, closing the blow-down valve after the sewage is completely discharged, sequentially opening a backwashing valve and a backwashing pump to start backwashing, finishing the backwashing for 4 min, and continuing the whole process for 33 min; the membrane flux is restored to 45.9 m3The effluent quality meets the III-class standard of the surface water environment quality; in the daily use process, the flat ceramic membrane ultrafiltration system is cleaned once a day and continuously operated for 139 days, and the membrane flux is always maintained at 46.1 +/-1.1 m3In the range of/h.
Example 4
The green rapid cleaning device for the flat ceramic membrane comprises an ultrasonic generating device 3 and an ultrafiltration membrane component 2 which are arranged in an ultrafiltration membrane pool 1, wherein an aeration pipe 10 is arranged in the ultrafiltration membrane pool 1 below the ultrafiltration membrane component 2, the aeration pipe 10 is connected with a fan 5 through a pipeline provided with an air inlet valve 4, a backwashing pipe is arranged above the ultrafiltration membrane component 2, and the backwashing pipe is connected with a clean water pool through a pipeline provided with a backwashing valve 4 and a backwashing pump 8; an overflow pipe 9 is arranged at the top of the side surface of the ultrafiltration membrane tank 1, a blow-off pipe 6 provided with a blow-off valve is communicated with the bottom of the side surface, the blow-off pipe 6 is arranged at the position which is 10cm away from the tank, and the overflow pipe 9 and the blow-off pipe 6 are respectively connected with the regulating tank.
In specific implementation, the mine water from a No. 4 coal mine enters an ultrafiltration system for filtration after coagulating sedimentation, and the initial membrane flux is 47.4 m3H (design flux 50.0 m)3H), the membrane flux is reduced to 35.0 m after running for 45 h3At the moment, cleaning the ceramic membrane;
firstly, starting an ultrasonic cleaning device, wherein the frequency is 50 MHz, the working current is 8A, the ultrasonic cleaning device is closed after 5 min of ultrasonic treatment, an air inlet valve and a fan are sequentially opened to start aeration, a blow-down valve is simultaneously opened to discharge sewage in an ultrafiltration membrane pool to a front end regulating tank, the blow-down valve is closed after the sewage is completely discharged, a backwashing valve and a backwashing pump are sequentially opened to start backwashing, the backwashing is finished for 4 min, and the whole process lasts for 13 min; the membrane flux is restored to 46.7 m3And h, the effluent quality meets the III-class standard of the surface water environment quality. In the daily use process, the flat ceramic membrane ultrafiltration system is cleaned once a day and continuously operated for 198 days, and the membrane flux is always maintained at 47.2 +/-1.3 m3In the range of/h.
The water quality of the mine water 1-4# in the above example after passing through the ultrafiltration system was tested, and the results are shown in table 1,
TABLE 1 quality test results (mg/L) of mineral crazy influent and effluent
Claims (7)
1. The green rapid cleaning device for the flat ceramic membrane is characterized by comprising an ultrasonic wave generating device and an ultrafiltration membrane assembly which are arranged in an ultrafiltration membrane tank, wherein an aeration pipe is arranged in the ultrafiltration membrane tank below the ultrafiltration membrane assembly, the aeration pipe is connected with a fan through a pipeline provided with an air inlet valve, a backwashing pipe is arranged above the ultrafiltration membrane assembly, and the backwashing pipe is connected with a clean water tank through a pipeline provided with a backwashing valve and a backwashing pump; the overflow pipe is arranged at the top end of the side surface of the ultrafiltration membrane pool, the blow-off pipe provided with a blow-off valve is communicated with the bottom of the side surface, and the overflow pipe and the blow-off pipe are respectively connected with the regulating pool.
2. The apparatus for green rapid cleaning of a ceramic membrane of a flat plate according to claim 1, wherein the ultrasonic generator comprises an ultrasonic generator and a frequency current regulator.
3. The apparatus for green rapid cleaning of a flat ceramic membrane according to claim 1 or 2, wherein the ultrasonic generator is installed on the peripheral side wall of the ultrafiltration membrane tank according to claim 1 or 2.
4. A green rapid cleaning device for a flat ceramic membrane according to claim 1 or 2, wherein the overflow pipe is opened at a position 20cm from the top end of the side surface of the ultrafiltration membrane tank.
5. The green rapid cleaning device for the flat ceramic membrane according to claim 1 or 2, wherein the drain pipe is arranged at a position 10cm away from the bottom of the ultrafiltration membrane tank on the side surface of the ultrafiltration membrane tank.
6. The green rapid cleaning device for the flat ceramic membrane according to claim 1 or 2, wherein the ultrafiltration membrane module is a flat ceramic membrane.
7. A green high-efficiency cleaning method for a flat ceramic membrane by using the device of any one of claims 1 to 6, which is characterized by comprising the following steps:
(1) starting an ultrasonic generating device, adjusting ultrasonic frequency, working current and working time, and carrying out ultrasonic work on the ultrafiltration membrane component;
(2) after the ultrasonic treatment is finished, starting aeration, firstly opening an air inlet valve, then opening a fan, and starting aeration from the bottom of the ultrafiltration membrane pool by an aeration pipe;
(3) aerating and communicating with a drain pipe at the same time, and enabling the sewage in the ultrafiltration membrane tank to flow to the regulating tank through the drain pipe;
(4) and after the sewage is completely discharged, closing the drain valve, opening the backwashing valve and the backwashing pump to start backwashing, and flushing the inside of the ceramic membrane by clean water to the outside so as to completely remove the dirt blocked in the pore passage of the ceramic membrane and finish the cleaning of the ceramic membrane.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911268744.0A CN111054218A (en) | 2019-12-11 | 2019-12-11 | Green and rapid cleaning device and cleaning method for flat ceramic membrane |
| JP2020205792A JP2021090960A (en) | 2019-12-11 | 2020-12-11 | Green high-speed cleaning device and cleaning method for flat ceramic membrane |
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| CN201911268744.0A CN111054218A (en) | 2019-12-11 | 2019-12-11 | Green and rapid cleaning device and cleaning method for flat ceramic membrane |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117228902A (en) * | 2023-11-13 | 2023-12-15 | 四川坤宇沃达智能科技有限公司 | Underground coal mine water treatment system |
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| CN113769587A (en) * | 2021-08-30 | 2021-12-10 | 国网新疆电力有限公司电力科学研究院 | Filter element on-site off-line cleaning device |
| CN113754017B (en) * | 2021-09-28 | 2023-04-28 | 湖北迪洁膜科技有限责任公司 | Novel ceramic membrane water purification device |
| CN114522542A (en) * | 2022-03-08 | 2022-05-24 | 重庆三峰科技有限公司 | External tubular ultrafiltration membrane dredging device and method |
| CN115193257A (en) * | 2022-05-19 | 2022-10-18 | 深圳市盘龙环境技术有限公司 | Inorganic ceramic membrane ultrafiltration purification device |
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| JP2021090960A (en) | 2021-06-17 |
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