CN111298656A - Backwashing system and method of roll type ultrafiltration membrane and water treatment system - Google Patents
Backwashing system and method of roll type ultrafiltration membrane and water treatment system Download PDFInfo
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- CN111298656A CN111298656A CN202010191198.1A CN202010191198A CN111298656A CN 111298656 A CN111298656 A CN 111298656A CN 202010191198 A CN202010191198 A CN 202010191198A CN 111298656 A CN111298656 A CN 111298656A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/10—Spiral-wound membrane modules
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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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
- 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
- B01D2321/18—Use of gases
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Abstract
The invention provides a backwashing system, a backwashing method and a water treatment system of a roll-type ultrafiltration membrane, wherein the backwashing system comprises a water inlet pump, an ultrafiltration device and an air compression device; an ultrafiltration membrane is arranged in the ultrafiltration device, a water inlet of the ultrafiltration device is connected with a water inlet pipe, and a water inlet pump is arranged on the water inlet pipe; the water outlet of the ultrafiltration device is connected with a water outlet pipe; the air compression device is connected to the water outlet pipe and provides compressed air into the ultrafiltration device through the water outlet pipe, so that the ultrafiltration membrane is reversely cleaned; the scheme provided by the invention can effectively reduce the investment cost of the backwashing part of the ultrafiltration system, simultaneously reduce the self-water consumption, shorten the backwashing time and improve the efficiency of the membrane system.
Description
Technical Field
The invention belongs to the technical field of cleaning of roll-type ultrafiltration membranes, and particularly relates to a backwashing system and method of a roll-type ultrafiltration membrane and a water treatment system.
Background
The membrane separation is used as an efficient and advanced filtration separation technology and is widely applied to filtration of water treatment and other material separation in the fields of municipal administration, energy, steel, petrochemical industry, medicine and the like. Compared with ultrafiltration in other structural forms, the roll-type ultrafiltration has the advantages of large packing density, horizontal placement, convenience in cross flow circulation, adjustable recovery rate, no dead angle design of a flow channel and the like, and is widely applied to separation, clarification, purification and concentration in the field of food and medicine, electrophoretic coating in the mechanical manufacturing industry, the fields of printing and dyeing chemical industry, environmental protection and the like.
After the existing membrane filtration is operated for a period of time, some pollutants are accumulated on the surface of the membrane filtration, so that the transmembrane pressure difference is increased, and the filtration flow is reduced. The ultrafiltration rate decreases due to contamination of the membrane surface and deposition of solutes, and in order to recover the ultrafiltration rate, the ultrafiltration membrane must be periodically backwashed with a permeate to wash away the contaminants on the membrane surface.
The hydraulic backwashing is an effective scheme for cleaning the ultrafiltration membrane, and mainly cleans pollutants adsorbed above and in membrane holes through reverse water flow, so the operation effect of the ultrafiltration membrane is greatly influenced by the quality of the backwashing effect; the existing roll-type ultrafiltration membrane backwashing system has the defects of large investment, large occupied area, consumption of the produced liquid as the self-service water and the like.
The backwashing system configured by the conventional ultrafiltration system consists of a backwashing water pump, a backwashing water tank, an automatic valve and a pipeline system; during operation, the backwashing water tank is filled with produced water, the operation is stopped after the operation is carried out for a set time or a set triggering condition, the backwashing water pump sends the produced water stored in the backwashing water tank into the membrane device to complete the backwashing process, the conventional backwashing process consumes about 7-10% of the produced water, and the consumed time is about 3-5 minutes.
Based on the technical problems existing in the ultrafiltration membrane filtration and backwashing processes, no relevant solution is provided; there is therefore a pressing need to find effective solutions to the above problems.
Disclosure of Invention
The invention aims to provide a backwashing system and method of a roll-type ultrafiltration membrane and a water treatment system aiming at overcoming the defects in the prior art, and aims to solve the problem of washing of the conventional ultrafiltration membrane.
The invention provides a backwashing system of a roll-type ultrafiltration membrane, which comprises a water inlet pump, an ultrafiltration device and an air compression device, wherein the water inlet pump is connected with the ultrafiltration device; an ultrafiltration membrane is arranged in the ultrafiltration device, a water inlet of the ultrafiltration device is connected with a water inlet pipe, and a water inlet pump is arranged on the water inlet pipe; the water outlet of the ultrafiltration device is connected with a water outlet pipe; the air compression device is connected to the water outlet pipe and provides compressed air into the ultrafiltration device through the water outlet pipe, so that the ultrafiltration membrane is reversely cleaned.
Furthermore, the backwashing system comprises a circulating pipe and a circulating pump, wherein one end of the circulating pipe is connected with a drain pipe, and the other end of the circulating pipe is connected with a water inlet pipe; the circulating pump is arranged on the circulating pipe or the water inlet pipe and is used for increasing the flow passage speed of fluid entering the surface of the ultrafiltration membrane in the ultrafiltration device.
Furthermore, a water inlet valve is arranged on the water inlet pipe, and the water inlet valve is positioned between the water inlet pump and the water inlet of the water inlet pipe; and/or a backwashing drain valve is arranged on the drain pipe, and the circulating pipe is connected to the drain pipe and is positioned between the backwashing drain valve and a drain outlet of the ultrafiltration device; one end of the circulating pipe is connected to the water inlet pipe and is positioned between the circulating pump and the water inlet pump.
Furthermore, a water production valve is arranged on the water outlet pipe; the air compression device is connected to the water outlet pipe through an air inlet pipe and is positioned between the water production valve and the water outlet of the ultrafiltration device; and a backwashing air inlet valve is arranged on the air inlet pipe and is used for controlling the time of compressed air entering a backwashing system.
Furthermore, the air inlet pipe is also provided with a compressed air pressure reducing valve which is used for adjusting the pressure of compressed air entering the backwashing system.
Correspondingly, the invention also provides a water treatment system, which comprises a backwashing system and a water tank, wherein the backwashing system is the backwashing system of the roll-type ultrafiltration membrane, and a water outlet pipe is connected with a water inlet of the water tank; when the water treatment system is in a water producing state, a water producing valve on the water outlet pipe is opened, and the air compression device is in a closed state; when the water treatment system is in an ultrafiltration membrane backwashing state, the water production valve is in a closed state, the backwashing drain valve on the drain pipe is opened, the air compression device is in an open state, and compressed air enters the ultrafiltration device through the water outlet pipe, so that reverse cleaning is carried out on the ultrafiltration membrane.
Correspondingly, the invention also provides a backwashing method of the roll-type ultrafiltration membrane, which is applied to the backwashing system of the roll-type ultrafiltration membrane and also comprises the following processes:
when the ultrafiltration membrane in the ultrafiltration device needs to be cleaned, a backwashing drain valve on the drain pipe is opened, the air compression device is opened, compressed air enters the water production side of the ultrafiltration membrane in the ultrafiltration device through the water outlet pipe, water stored in the water production side pipe is pressed to flow to the concentrated water side of the ultrafiltration membrane, the ultrafiltration membrane is cleaned in the reverse direction, and the concentrated water after the reverse cleaning is discharged through the drain pipe.
Further, when the ultrafiltration membrane in the ultrafiltration device needs to be cleaned, the compressed air in the air compression device is decompressed to between 1.4bar and 1.6bar through a compressed air decompression valve and is kept for 8s to 12 s.
Further, the following exhaust and water filling processes are included after the first backwashing is finished: and opening a water production valve on the water outlet pipe, closing a backwashing air inlet valve on an air inlet pipe of the air compression device, and closing a backwashing water discharge valve on the water discharge pipe, so that the water production side in the ultrafiltration membrane is exhausted and filled with water, and the exhausting and filling time is kept to 8-12 s.
Further, after the air exhaust and water filling are completed, the first backwashing process is repeated, the second backwashing is completed, and the time of the second backwashing is kept between 8s and 12 s.
The scheme provided by the invention has the following advantages and beneficial effects:
firstly, the backwashing system, the backwashing method and the water treatment system of the roll-type ultrafiltration membrane do not need to be provided with a backwashing water tank, a backwashing water pump and a backwashing pipeline valve system, so that the investment is saved and the occupied land is reduced.
According to the backwashing system, method and water treatment system of the roll-type ultrafiltration membrane, water stored in the water production side pipe is used for backwashing through compressed air, so that water production consumption is reduced, and filtering efficiency is improved.
The backwashing system, the backwashing method and the water treatment system of the roll-type ultrafiltration membrane shorten the backwashing time and improve the operation efficiency of the system.
Fourthly, the backwashing system, the backwashing method and the water treatment system of the roll-type ultrafiltration membrane can simply and repeatedly backwash, so that the backwashing effect is ensured.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The invention will be further explained with reference to the drawings, in which:
FIG. 1 is a schematic structural diagram of a backwashing system of a roll-type ultrafiltration membrane of the present invention;
FIG. 2 is a flow chart of a backwashing method of the roll-type ultrafiltration membrane of the present invention.
In the figure: 1. a water inlet pump; 2. a circulation pump; 3. a water inlet valve; 4. a compressed air pressure reducing valve; 5. backwashing the air inlet valve; 6. a water production valve; 7. backwashing the drain valve; 8. a water inlet pipe; 9. a water outlet pipe; 10. a circulation pipe; 11. and a water discharge pipe.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, the invention provides a backwashing system of a roll-type ultrafiltration membrane, which mainly aims at the problem that the existing roll-type ultrafiltration membrane is reversely cleaned after being filtered for a long time, so that the filtering effect of the ultrafiltration membrane is improved; the backwashing system specifically comprises a water inlet pump 1, an ultrafiltration device and an air compression device; wherein, an ultrafiltration membrane is arranged in the ultrafiltration device, a water inlet of the ultrafiltration device is connected with a water inlet pipe 8, and a water inlet pump 1 is arranged on the water inlet pipe 8 and is used for feeding water or feed liquid to be filtered into the ultrafiltration membrane device for filtering; further, a water outlet of the ultrafiltration device is connected with a water outlet pipe 11, and the water outlet is communicated with the concentrated water side of the ultrafiltration membrane in the ultrafiltration device; the water outlet of the ultrafiltration device is connected with a water outlet pipe 9, and the water outlet is communicated with the water production side of an ultrafiltration membrane in the ultrafiltration device; further, an air compression device is connected to the water outlet pipe 9, the air compression device is used for providing compressed air into the ultrafiltration device through the water outlet pipe, the pressure of the compressed air is utilized to enable water stored on the water producing side of the membrane to reversely flow, and the backwashing on the ultrafiltration membrane is completed through the pressure provided by the compressed air; the scheme provided by the invention can effectively reduce the cost of the backwashing part of the ultrafiltration system, simultaneously reduce the self-water consumption, shorten the backwashing time and improve the efficiency of the membrane system.
Preferably, in combination with the above scheme, as shown in fig. 1, the backwashing system comprises a circulating pipe 10 and a circulating pump 2, wherein one end of the circulating pipe 10 is connected with a drain pipe 11, and the other end of the circulating pipe 10 is connected with a water inlet pipe 8; the circulating pump 2 is arranged on the circulating pipe 10 or the water inlet pipe 8, the circulating pump 2 is used for increasing the flow channel speed of fluid entering the surface of an ultrafiltration membrane in the ultrafiltration device, conveying backwash liquid in the circulating pipe 10 into the ultrafiltration device, keeping the surface of the membrane clean, reducing concentration polarization of the surface of the membrane during filtration, and taking away fallen pollutants during backwashing; the fluid may be water or a feed liquid; specifically, in the actual process of filtering and producing water, the circulating pipe 10 can circulate the concentrated water on the concentrated water side of the ultrafiltration membrane in the ultrafiltration device to the water inlet pipe 8 and then enter the ultrafiltration device again for filtering, and the water production rate can be improved under the condition that the water quality of the concentrated water does not reach the discharge standard; furthermore, in the scheme provided by the invention, in order to reduce the membrane surface fouling, the circulating pump 2 is usually arranged, so that water passes through the filtering surface of the ultrafiltration membrane at a relatively high flow rate, thereby reducing concentration polarization and slowing down the membrane surface fouling.
Preferably, in combination with the above scheme, as shown in fig. 1, a water inlet valve 3 is arranged on the water inlet pipe 8, and the water inlet valve 3 is located between the water inlet pump 2 and the water inlet of the water inlet pipe 8; furthermore, a backwashing drainage valve 7 is arranged on the drainage pipe 11, and the circulating pipe is connected to the drainage pipe 11 and is positioned between the backwashing drainage valve 7 and a drainage port of the ultrafiltration device; one end of the circulating pipe 10 is connected to the water inlet pipe 8 and is positioned between the circulating pump 2 and the water inlet pump 1, so that the circulating pipe is designed to be beneficial to discharging the pollutants after backwashing by utilizing circulating liquid.
Preferably, in combination with the above scheme, as shown in fig. 1, a water production valve 6 is arranged on the water outlet pipe 9; the air compression device is connected to the water outlet pipe 9 through an air inlet pipe and is positioned between the water production valve 6 and the water outlet of the ultrafiltration device, and the design enables the water production valve 6 to control the production pipe to carry out backwashing; furthermore, a backwashing air inlet valve 5 is arranged on the air inlet pipe, and the backwashing air inlet valve 5 is used for controlling the air inlet pipe so as to perform backwashing; further, the backwashing air inlet valve 5 is an electromagnetic valve, and the backwashing air inlet valve 5 is used for controlling the time when the compressed air enters the backwashing system.
Preferably, in combination with the above scheme, as shown in fig. 1, the air inlet pipe is further provided with a compressed air pressure reducing valve 4, and the compressed air pressure reducing valve 4 is used for adjusting the pressure of compressed air entering the backwashing system; in general, the compressed air in the air compression device is decompressed to 1.4bar to 1.6bar by a compressed air decompression valve 4 and is kept for 8s to 12 s; specifically, the compressed air in the air compressing device is preferably decompressed to 1.5bar by the compressed air decompression valve 4.
The scheme provided by the invention provides a novel backwashing system and process aiming at the defects that the existing roll-type ultrafiltration membrane backwashing system is large in investment and occupied area, and the produced liquid is required to be consumed as the self-service water, and the like, and the system and the process have the advantages of simple system, low investment, stable effect, high automation degree, improvement on the efficiency of the ultrafiltration membrane system and the like; according to the backwashing system of the roll-type ultrafiltration membrane, facilities such as a backwashing water tank, a backwashing water pump and related pipeline valves are not needed to be arranged, and only a strand of decompressed compressed air and an electromagnetic valve for controlling the compressed air are connected to a water production pipeline.
Correspondingly, in combination with the above scheme, as shown in fig. 1, the present invention further provides a water treatment system, which comprises a backwashing system and a water tank, wherein the backwashing system is the backwashing system of the roll-type ultrafiltration membrane, and a water outlet pipe 9 is connected to a water inlet of the water tank for producing water; specifically, when the water treatment system is in a water production state, the water production valve 6 on the water outlet pipe 9 is opened, the air compression device is in a closed state, the backwashing air inlet valve 5 is in a closed state, tap water enters the ultrafiltration device through the water inlet pipe 8 under the action of the water inlet pump 3, is filtered by the ultrafiltration membrane, and then enters the water tank through the water outlet pipe 9 from the water outlet of the ultrafiltration device; when the water treatment system is in an ultrafiltration membrane backwashing state, the water production valve 6 is in an open state, the backwashing drain valve 7 on the drain pipe 11 is opened, the air compression device is in an open state, compressed air enters the ultrafiltration device through the water outlet pipe, and the compressed air drives water stored in the water production side pipe to reversely flow, so that reverse cleaning is carried out on the ultrafiltration membrane; specifically, some pollutants are still deposited on the surface of the ultrafiltration membrane after the ultrafiltration membrane is operated for a period of time, backwashing is needed to be removed, the backwashing system can be specifically adopted to be combined with the backwashing technology for backwashing, and the pollutants on the surface of the nanofiltration membrane removed by backwashing are discharged out of the membrane system along with the inflow water of the circulating flow through the backwashing drain valve 7 and the drain pipe 11, so that the membrane system is recovered to be clean.
Correspondingly, in combination with the above scheme, as shown in fig. 1 and fig. 2, the invention also provides a backwashing method of the roll-type ultrafiltration membrane, which is applied to the backwashing system of the roll-type ultrafiltration membrane, and the backwashing method of the roll-type ultrafiltration membrane reduces the equipment investment cost of the backwashing system and improves the system operation efficiency; specifically, the backwashing method further comprises the following processes:
when the operation of the water treatment system reaches a set operation time, or the yield is reduced to a set value due to fouling on the surface of the membrane, and the ultrafiltration membrane in the ultrafiltration device needs to be cleaned, a backwashing program is started, a backwashing drain valve 7 on a drain pipe 11 is opened, a backwashing air inlet valve 5 on an air compression device is opened, so that compressed air enters the water production side of the ultrafiltration membrane in the ultrafiltration device through a water outlet pipe 9, water stored in a pipe at the water production side is pressed to flow to the concentrated water side of the ultrafiltration membrane, a pollution layer blocked on the surface of the membrane is loosened and taken away by inflow water flowing on the surface of the membrane, and the water is discharged through a backwashing drain valve 8, so that the ultrafiltration membrane is cleaned reversely, and the concentrated water after backwashing; specifically, in order to reduce fouling on the membrane surface, a circulation pump 2 is usually provided to make water pass through the filtration surface of the ultrafiltration membrane at a relatively high flow rate, so as to reduce concentration polarization and slow down fouling on the membrane surface.
Preferably, in combination with the above scheme, as shown in fig. 1 and fig. 2, when backwashing of the ultrafiltration membrane in the ultrafiltration device is required, the compressed air in the air compression device is decompressed to between 1.4bar and 1.6bar through a compressed air decompression valve 4 and is kept for 8s to 12 s; in particular, the compressed air in the air compressor arrangement is preferably reduced to 1.5bar by means of a compressed air reduction valve 4, the time remaining in particular at optimum 10 s.
Preferably, in combination with the above solution, as shown in fig. 1 and fig. 2, the following exhaust and water filling processes are further included after the first cleaning process is completed: and opening a water production valve 6 on a water outlet pipe 9, closing a backwashing air inlet valve 5 on an air inlet pipe of the air compression device, and closing a backwashing water discharge valve 7 on a water discharge pipe 11, so that the water production side in the ultrafiltration membrane is exhausted and filled with water, and the exhausting and filling time is kept to 8 s-12 s.
Preferably, in combination with the above scheme, as shown in fig. 1 and fig. 2, after the exhaust and water filling are completed, the first backwashing process is repeated, and then the second backwashing is completed, wherein the time for the second backwashing is kept between 8s and 12 s; specifically, after 2 times of backwashing is completed, an ideal backwashing effect can be achieved, the time of the whole backwashing process is consumed for 30S, and after the backwashing is completed, the ultrafiltration membrane system can enter the next water production period.
The scheme provided by the invention has the following advantages and beneficial effects:
firstly, the backwashing system, the backwashing method and the water treatment system of the roll-type ultrafiltration membrane do not need to be provided with a backwashing water tank, a backwashing water pump and a backwashing pipeline valve system, so that the investment is saved and the occupied land is reduced.
According to the backwashing system, method and water treatment system of the roll-type ultrafiltration membrane, water stored in the water production side pipe is used for backwashing through compressed air, so that water production consumption is reduced, and filtering efficiency is improved.
The backwashing system, the backwashing method and the water treatment system of the roll-type ultrafiltration membrane shorten the backwashing time and improve the operation efficiency of the system.
Fourthly, the backwashing system, the backwashing method and the water treatment system of the roll-type ultrafiltration membrane can simply and repeatedly backwash, so that the backwashing effect is ensured.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Those skilled in the art can make numerous possible variations and modifications to the described embodiments, or modify equivalent embodiments, without departing from the scope of the invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technology of the present invention are within the protection scope of the present invention, unless the content of the technical solution of the present invention is departed from.
Claims (10)
1. A backwashing system of a roll type ultrafiltration membrane is characterized by comprising a water inlet pump (1), an ultrafiltration device and an air compression device; an ultrafiltration membrane is arranged in the ultrafiltration device, a water inlet of the ultrafiltration device is connected with a water inlet pipe (8), and the water inlet pump (1) is arranged on the water inlet pipe (8); a water outlet of the ultrafiltration device is connected with a water outlet pipe (11), and a water outlet of the ultrafiltration device is connected with a water outlet pipe (9); the air compression device is connected to the water outlet pipe (9), and the air compression device provides compressed air into the ultrafiltration device through the water outlet pipe so as to backwash the ultrafiltration membrane.
2. The backwashing system of the roll type ultrafiltration membrane according to claim 1, wherein the backwashing system comprises a circulating pipe (10) and a circulating pump (2), one end of the circulating pipe (10) is connected with the drain pipe (11), and the other end of the circulating pipe (10) is connected with the water inlet pipe (8); the circulating pump (2) is arranged on the circulating pipe (10) or the water inlet pipe (8), and the circulating pump (2) is used for increasing the flow channel speed of fluid entering the surface of an ultrafiltration membrane in the ultrafiltration device.
3. The backwashing system of the roll type ultrafiltration membrane according to claim 2, wherein a water inlet valve (3) is provided on the water inlet pipe (8), the water inlet valve (3) is positioned between the water inlet pump (2) and the water inlet of the water inlet pipe (8); and/or a backwashing drain valve (7) is arranged on the drain pipe (11), and the circulating pipe is connected to the drain pipe (11) and is positioned between the backwashing drain valve (7) and a drain outlet of the ultrafiltration device; one end of the circulating pipe (10) is connected to the water inlet pipe (8) and is positioned between the circulating pump (2) and the water inlet pump (1).
4. The backwashing system of the roll-type ultrafiltration membrane according to claim 3, wherein a water production valve (6) is arranged on the water outlet pipe (9); the air compression device is connected to the water outlet pipe (9) through an air inlet pipe and is positioned between the water production valve (6) and the water outlet of the ultrafiltration device; and a backwashing air inlet valve (5) is arranged on the air inlet pipe, and the backwashing air inlet valve (5) is used for controlling the time of compressed air entering a backwashing system.
5. The backwashing system of the roll type ultrafiltration membrane according to claim 4, wherein a compressed air pressure reducing valve (4) is further arranged on the air inlet pipe, and the compressed air pressure reducing valve (4) is used for adjusting the pressure of compressed air entering the backwashing system.
6. A water treatment system, comprising a backwashing system and a water tank, wherein the backwashing system is the backwashing system of the roll type ultrafiltration membrane of any one of claims 1 to 5, and the water outlet pipe (9) is connected with the water inlet of the water tank; when the water treatment system is in a water production state, a water production valve (6) on the water outlet pipe (9) is opened, and the air compression device is in a closed state; when the water treatment system is in an ultrafiltration membrane backwashing state, the water production valve (6) is in a closed state, the backwashing drain valve (7) on the drain pipe (11) is opened, the air compression device is in an open state, and compressed air enters the ultrafiltration device through the water outlet pipe, so that reverse cleaning is performed on the ultrafiltration membrane.
7. The backwashing method of the roll-type ultrafiltration membrane is applied to the backwashing system of the roll-type ultrafiltration membrane in any one of the claims 1 to 5, and is characterized by further comprising the following processes:
when the ultrafiltration membrane in the ultrafiltration device needs to be cleaned, a backwashing drain valve (7) on the drain pipe (11) is opened, the air compression device is opened, so that compressed air enters the water production side of the ultrafiltration membrane in the ultrafiltration device through the water outlet pipe (9), water stored in a pipe at the water production side is pressed to flow to the concentrated water side of the ultrafiltration membrane, the ultrafiltration membrane is cleaned reversely, and the backwashed concentrated water is discharged through the drain pipe (11).
8. The backwashing method of the rolled ultrafiltration membrane according to claim 7, wherein when the ultrafiltration membrane in the ultrafiltration device needs to be cleaned, the compressed air in the air compression device is decompressed to between 1.4bar and 1.6bar through a compressed air decompression valve (4) and is kept for 8s to 12 s.
9. The backwashing method of the roll-type ultrafiltration membrane according to claim 7, further comprising the following air discharging and water filling processes after the first backwashing is completed: and (3) opening a water production valve (6) on a water outlet pipe (9), closing a backwashing air inlet valve (5) on an air inlet pipe of the air compression device, and closing a backwashing drainage valve (7) on a drainage pipe (11), so that the water production side in the ultrafiltration membrane is exhausted and filled with water, and the exhausting and filling time is kept to 8-12 s.
10. The backwashing method of the roll-type ultrafiltration membrane according to claim 9, wherein the first backwashing process is repeated to complete the second backwashing after the air discharging and the water filling are completed, and the time of the second backwashing is maintained to be 8s to 12 s.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112755791A (en) * | 2020-12-18 | 2021-05-07 | 武汉艾科滤膜技术有限公司 | Ultrafiltration membrane emptying system |
| CN113274881A (en) * | 2021-06-29 | 2021-08-20 | 迈海(苏州)环保科技有限公司 | Flexible tubular large-aperture membrane filter device and cleaning method thereof |
| CN114163053A (en) * | 2021-11-26 | 2022-03-11 | 楚天华通医药设备有限公司 | Water treatment system, modular water treatment device and working method thereof |
| CN114162903A (en) * | 2021-11-26 | 2022-03-11 | 楚天华通医药设备有限公司 | Filtering system, filtering device and working method thereof |
| CN117046313A (en) * | 2023-09-19 | 2023-11-14 | 北京美能环保科技有限公司 | Device and method for cleaning ultrafiltration or microfiltration membrane |
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| CN112755791A (en) * | 2020-12-18 | 2021-05-07 | 武汉艾科滤膜技术有限公司 | Ultrafiltration membrane emptying system |
| CN113274881A (en) * | 2021-06-29 | 2021-08-20 | 迈海(苏州)环保科技有限公司 | Flexible tubular large-aperture membrane filter device and cleaning method thereof |
| CN114163053A (en) * | 2021-11-26 | 2022-03-11 | 楚天华通医药设备有限公司 | Water treatment system, modular water treatment device and working method thereof |
| CN114162903A (en) * | 2021-11-26 | 2022-03-11 | 楚天华通医药设备有限公司 | Filtering system, filtering device and working method thereof |
| CN114163053B (en) * | 2021-11-26 | 2024-06-28 | 楚天华通医药设备有限公司 | Water treatment system, modularized water treatment device and working method thereof |
| CN117046313A (en) * | 2023-09-19 | 2023-11-14 | 北京美能环保科技有限公司 | Device and method for cleaning ultrafiltration or microfiltration membrane |
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