CN103357273A - Online backwashing device and method in ultrafiltration process - Google Patents
Online backwashing device and method in ultrafiltration process Download PDFInfo
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- CN103357273A CN103357273A CN2013102901313A CN201310290131A CN103357273A CN 103357273 A CN103357273 A CN 103357273A CN 2013102901313 A CN2013102901313 A CN 2013102901313A CN 201310290131 A CN201310290131 A CN 201310290131A CN 103357273 A CN103357273 A CN 103357273A
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- milipore filter
- filter device
- fluid diverter
- transfer valve
- diverter cylinder
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Abstract
The invention discloses an online backwashing device and an online backwashing method in an ultrafiltration process. The online backwashing device is a fluid switching cylinder, ultrafiltration membrane devices and a feed pump are respectively connected with two ends of the online backwashing device, and a sliding piston is arranged in the fluid switching cylinder. The online backwashing process comprises the following steps of: carrying out ultrafiltration on a plurality of parallel ultrafiltration membrane devices and injecting filtrate in the fluid switching cylinder; carrying out online backwashing on one of the ultrafiltration membrane devices; after completing the online backwashing of the ultrafiltration membrane device, repeatedly carrying out ultrafiltration on all ultrafiltration membrane devices and injecting the filtrate in the fluid switching cylinder; and repeatedly carrying out the steps, and sequentially realizing an online backwashing process of all the parallel ultrafiltration membrane devices. The online backwashing device and method have the characteristics of simple process, reliability in implementation, strong practicability, small investment, energy and resource conservation, and the like, and realizes a continuous ultrafiltration process, thus the production efficiency is greatly increased.
Description
Technical field
The present invention relates to the online anti-cleaning device of a kind of ultrafiltration (UF) process and method, belong to film cleaning technique field.
Background technology
The membrane separation technique relevant with water treatment mainly comprises several classes such as micro-filtration, ultrafiltration, nanofiltration and counter-infiltration at present.These film products of separated all are the interdiction capabilities that utilize the porous material of special manufacturing, and the mode of holding back with physics is removed in the water a certain size granule foreign.Wherein, the milipore filter aperture is 0.001-0.1 μ m, the large molecule virus in can filtered water, colloid, bacterium, algae etc.
Ultrafiltration apparatus is through the operation of certain hour, and the materials such as a large amount of colloids, large molecule virus, bacterium, algae can be held back in the milipore filter surface, and this can cause the film surface void dirty stifled, so that the device aquifer yield descends, system running pressure rises, even causes fracture of wire.Therefore, when ultrafiltration apparatus moves, need to regularly to its anti-trapped substance that cleans to take away the film surface, recover the filtering function of milipore filter.Mainly there are following problem in the anti-cleaning device of ultrafiltration that generally uses at present and method as shown in Figure 1:
1. engineering in general is established many cover ultrafiltration apparatus, and all the milipore filter devices in every covering device are counter simultaneously to be cleaned, soon punching, Chemical cleaning supervisor.The anti-scavenging pump flow-rate ratio of ultrafiltration is larger, and the anti-water yield of cleaning generally is 2 times of when operation, and the anti-cleaning water tank of larger capacity need to be set, and when cleaning ultrafiltration apparatus is counter, the anti-scavenging pump of ultrafiltration draws water from this water tank.
2. the general operation of ultrafiltration was instead cleaned once in 0.5 to 1 hour, and each anti-cleaning lasted about 1 to 3 minute.Current way is to establish the anti-flushing water pump of ultrafiltration at present.The so numerous start and stop of pumping frequency, every 0.5 to 1 hour, the anti-scavenging pump start and stop of ultrafiltration once only moved 1 to 3 minute at every turn, and the utilization rate of pump is not high, and frequent start-stop easily makes pump damage.It is discontinuous that water is produced in ultrafiltration, and the ultrafiltration producing water ratio is generally at 90-95%, individual other technique even lower.
So seek novel online anti-cleaning method, not only can enhance productivity, reduce the equipment operating pressure, extension device service life, and water resource that can saves valuable.
Summary of the invention
The object of the present invention is to provide the online anti-apparatus and method of cleaning of a kind of ultra-filtration process.The anti-apparatus structure that cleans is simple, reliable online, and its procedure energy consumption is low.
The present invention is achieved through the following technical solutions, the online anti-device that cleans of a kind of ultra-filtration process, described ultra-filtration process, to adopt to comprise feed pump, the device that transfer valve and two or more milipore filter devices in parallel consist of is realized, its process is: feed liquid enters the milipore filter device by feed pump by the side on the milipore filter device, through membrane filtration, filtrate is flowed out from termination, milipore filter device lower end, concentrate flows out from milipore filter device lower end, the online anti-device that cleans of this ultra-filtration process, it is characterized in that, this device is provided with a fluid diverter cylinder, described fluid diverter cylinder is by an airtight cylinder, and the piston formation that a sealing is slided in the cylinder, an end of this fluid diverter cylinder links to each other with the outlet of the filtrate flow of milipore filter device, and its tube connector is provided with transfer valve, the other end of this fluid diverter cylinder links to each other with the feed liquid delivery side of pump, and its tube connector is provided with transfer valve.
Adopt the online anti-cleaning device of said structure to realize the online anti-cleaning method of ultra-filtration process, it is characterized in that comprising following process:
1) opens feed pump, only add feed liquid to the fluid diverter cylinder, cause fluid diverter cylinder inner carrier to move to the fluid diverter cylinder and bring out with being connected of milipore filter device;
2) n (n 〉=2) milipore filter device carries out simultaneously ultrafiltration and injects filtrate to the fluid diverter cylinder:
Open feed pump, the feed liquid of opening each milipore filter device enters transfer valve and the fluid diverter cylinder feed liquid dump valve of transfer valve, filtrate output valve, milipore filter device communication of fluid diverter cylinder, close the anti-cleaning fluid transfer valve of milipore filter device and the transfer valve that feed liquid enters the fluid diverter cylinder, the milipore filter device carries out work under operating conditions like this, continuous output filtrate, the piston that while part filtrate enters in fluid diverter cylinder and the propelling fluid diverter cylinder moves, until piston moves to the link place of fluid diverter cylinder and feed pump;
3) to n
1The milipore filter device carries out online anti-the cleaning:
Close n
1The feed liquid of milipore filter device enters transfer valve, filtrate output transfer valve and concentrate dump valve, closes transfer valve and the fluid diverter cylinder feed liquid dump valve of other milipore filter device communication of fluid diverter cylinders, opens n
1The anti-cleaning fluid transfer valve of milipore filter device and the transfer valve of communication of fluid diverter cylinder are opened the transfer valve that feed liquid enters the fluid diverter cylinder, realize n under the feed pump continuous operation
1The milipore filter device carries out online anti-the cleaning, at this moment, the part feed liquid of feed pump output enters fluid diverter cylinder and pushing piston and moves to the other end of fluid diverter cylinder, constantly injects feed liquid in the fluid diverter cylinder, piston extrudes and enters n with the filtrate in the fluid diverter cylinder in this moving process
1The milipore filter device flows out from anti-cleaning fluid transfer valve, has realized n
1The milipore filter device carries out online anti-the cleaning, and other milipore filter devices are still carrying out ultra-filtration process;
4) finish n
1After online anti-cleaning of milipore filter device, repeat n milipore filter device and carry out ultrafiltration and inject filtrate to the fluid diverter cylinder:
Open n
1The feed liquid of milipore filter device enters transfer valve and filtrate output transfer valve, opens the transfer valve of other milipore filter device communication of fluid diverter cylinders, opens fluid diverter cylinder feed liquid dump valve, closes n
1The anti-cleaning fluid transfer valve of milipore filter device, close feed liquid and enter the transfer valve of fluid diverter cylinder, this moment, n milipore filter device entered ultra-filtration process again, and the fluid diverter cylinder then enters continuous injection filtrate, and piston constantly moves and discharge by the feed liquid drain valve process of feed liquid;
5) constantly repeat with reference to 2), 3) way of step, realize n successively
2N
nThe online anti-cleaning process of milipore filter device.
The invention has the beneficial effects as follows: the inventive method is simple and easy to realize, implements reliable, practical.Its process as anti-rinse water, provides anti-cleaning pressure by fluid diverter cylinder storage compartment filtrate, has reduced anti-flushing water pump and anti-configuration of cleaning water tank, has reduced cost of equipment and maintenance cost, has saved the energy and resource.And realized the serialization of ultra-filtration process, increased substantially production efficiency.As method of the present invention is improved accordingly and processed, also be applicable to online anti-cleaning of other membrane process.
Description of drawings
Fig. 1 is the schematic flow sheet of the anti-cleaning method that generally adopts of present ultra-filtration process.
The ultra-filtration process that Fig. 2 is the present invention as an example of 2 milipore filter devices in parallel example is in ultrafiltration and injects the schematic flow sheet of filtrate process to the fluid diverter cylinder.
Fig. 3 is that the ultra-filtration process of the present invention as an example of 2 milipore filter devices in parallel example is in the schematic flow sheet that some milipore filter devices carry out online anti-cleaning process.
Among Fig. 2 and Fig. 3,1 is feed pump, and 2-1 is milipore filter device n
1, 2-2 is milipore filter device n
2, 3 is the fluid diverter cylinder, 4-1 is milipore filter device n
1Filtrate output valve, 4-2 is milipore filter device n
2Filtrate output valve, 5-1 is milipore filter device n
1The transfer valve of communication of fluid diverter cylinder, 5-2 are milipore filter device n
2The transfer valve of communication of fluid diverter cylinder, 6-1 are that feed liquid enters milipore filter device n
1Transfer valve, 6-2 is that feed liquid enters milipore filter device n
2Transfer valve, 7-1 is milipore filter device n
1Anti-cleaning fluid transfer valve, 7-2 is milipore filter device n
2Anti-cleaning fluid transfer valve, 8 for feed liquid enters the transfer valve of fluid diverter cylinder, 9 is fluid diverter cylinder feed liquid dump valve, 10-1 is milipore filter device n
1The concentrate dump valve, 10-2 is milipore filter device n
2The concentrate dump valve, 11 is the piston in the fluid diverter cylinder.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing 2 and accompanying drawing 3, and following examples are descriptive, are not determinate, can not limit protection scope of the present invention with this.
Two milipore filter devices that present embodiment adopts are Kynoar MIF. III 1A milipore filter device, and each milipore filter device is of a size of φ 90mm * 1106mm, the separation aperture 0.1 μ m of milipore filter.The cylinder body of fluid diverter cylinder is the fiberglass body, and its appearance and size is φ 200mm * 1000mm.The transfer valve of installing on the pipeline all adopts magnetic valve.The model of feed pump is S25 ' 25-12.5, and anti-rinse water outlet conduit outlet is lower than ultrafiltrate pipe outlet 2 m.
Take said apparatus to salt content as the process that the seawater of 35000 mg/L carries out ultrafiltration be: through pretreated seawater (quite feed liquid) by sea water pump (suitable feed pump) 1 take flow as 2.2 m
3/ h and pressure are that 0.08 MPa carries, and at first open the transfer valve 8 that feed liquid enters the fluid diverter cylinder, only carry seawater to the fluid diverter cylinder, cause its interior piston 11 to be in the B end place of fluid diverter cylinder, and this process was finished within very short time.Then, the feed liquid of opening two milipore filter devices enters transfer valve 6-1,6-2, filtrate output valve 4-1,4-2, and transfer valve 5-1, the 5-2 of communication of fluid diverter cylinder, concentrate dump valve 10-1,10-2 close anti-cleaning fluid transfer valve 7-1,7-2; Close feed liquid and enter the transfer valve 8 of fluid diverter cylinder, open fluid diverter cylinder feed liquid dump valve 9, then seawater is entered in the milipore filter device by each milipore filter device upper side respectively, seawater is by the ultrafiltration of milipore filter, fresh water (quite filtrate) is by milipore filter device lower end output, part fresh water (quite filtrate) enters in the fluid diverter cylinder 3, and the piston 11 in the propelling fluid diverter cylinder is mobile to the A end by the B end of fluid diverter cylinder, when piston moves, discharge fluid diverter cylinder maritime interior waters (quite feed liquid) by fluid diverter cylinder feed liquid dump valve 9, so operation is after 0.5 hour, find that fresh water yield has downward trend, and the piston 11 in the fluid diverter cylinder is in the A end of fluid diverter cylinder, then begins first milipore filter device is carried out online anti-the cleaning.
The online anti-cleaning process of first milipore filter device is as follows: the feed liquid of closing first milipore filter device enters transfer valve 6-1, filtrate output valve 4-1, concentrate dump valve 10-1, open the transfer valve 5-1 of communication of fluid diverter cylinder, anti-cleaning fluid transfer valve 7-1, close the transfer valve 5-2 of the communication of fluid diverter cylinder of second milipore filter device, fluid diverter cylinder feed liquid dump valve 9, open the transfer valve 8 that feed liquid enters the fluid diverter cylinder, at this moment, part seawater from sea water pump 1 enters in the fluid diverter cylinder 3 by the transfer valve 8 that feed liquid enters the fluid diverter cylinder, pushing piston 11 is mobile to the B end of fluid diverter cylinder, piston is constantly discharged the fresh water in the fluid diverter cylinder (quite filtrate) extruding at this moving process, the fresh water of being discharged by the fluid diverter cylinder enters first milipore filter device through the transfer valve 5-1 of communication of fluid diverter cylinder, to its anti-cleaning, anti-cleaning fluid is discharged by anti-cleaning fluid transfer valve 7-1, this anti-cleaning process can be finished at 2 minutes, when first milipore filter device is carried out anti-cleaning process, second milipore filter device still is in the ultrafiltration operation, at this moment, pistons 11 in the fluid diverter cylinder 3 are in the B end of fluid diverter cylinder, then regulate transfer valve and recover first milipore filter device and be in the ultrafiltration operation.
Recovering first milipore filter device is in the ultrafiltration running and is: the feed liquid of opening first milipore filter device enters transfer valve 6-1, filtrate output valve 4-1, concentrate dump valve 10-1, the transfer valve 5-1 of communication of fluid diverter cylinder, close anti-cleaning fluid transfer valve 7-1, open the transfer valve 5-2 of the communication of fluid diverter cylinder of second milipore filter device, fluid diverter cylinder feed liquid dump valve 9, close feed liquid and enter the transfer valve 8 of fluid diverter cylinder, at this moment, seawater from sea water pump 1 enters two milipore filter devices, first milipore filter is thought highly of and newly is in ultrafiltration operation, second milipore filter device continues the ultrafiltration operation, this process operation time is also very short, and hold A end required time to determine by fluid diverter cylinder inner carrier 11 from B this running time.When piston arrives A end, begin second milipore filter device carried out online anti-the cleaning.
Second online anti-cleaning process of milipore filter device and the online anti-cleaning process of milipore filter device are similar.
Recover second milipore filter device and be in the ultrafiltration running and be, to be in the ultrafiltration running similar with recovering first milipore filter device for this process.
Carry out successively above-mentioned online anti-cleaning process and recover the milipore filter device being in the ultrafiltration running, thereby realize a plurality of milipore filter devices in parallel are carried out online anti-cleaning of loop cycle.
Claims (2)
1. online anti-cleaning device of ultra-filtration process, described ultra-filtration process, to adopt to comprise feed pump, the device that transfer valve and two or more milipore filter devices in parallel consist of is realized, its process is: feed liquid enters the milipore filter device by feed pump by the side on the milipore filter device, through membrane filtration, filtrate is flowed out from termination, milipore filter device lower end, concentrate flows out from milipore filter device lower end, the online anti-device that cleans of this ultra-filtration process, it is characterized in that, this device is provided with a fluid diverter cylinder, and described fluid diverter cylinder is by an airtight cylinder, and the piston formation that a sealing is slided in the cylinder, one end of this fluid diverter cylinder links to each other with the outlet of the filtrate flow of milipore filter device, its tube connector is provided with transfer valve, and the other end of this fluid diverter cylinder links to each other with the feed liquid delivery side of pump, and its tube connector is provided with transfer valve.
2. one kind is adopted device claimed in claim 1 to carry out the online anti-method of cleaning of ultra-filtration process, it is characterized in that comprising following process:
1) opens feed pump, only add feed liquid to the fluid diverter cylinder, cause fluid diverter cylinder inner carrier to move to the fluid diverter cylinder and bring out with being connected of milipore filter device;
2) n milipore filter device carries out simultaneously ultrafiltration and injects filtrate to the fluid diverter cylinder:
Open feed pump, the feed liquid of opening each milipore filter device enters transfer valve and the fluid diverter cylinder feed liquid dump valve of transfer valve, filtrate output valve, milipore filter device communication of fluid diverter cylinder, close the anti-cleaning fluid transfer valve of milipore filter device and the transfer valve that feed liquid enters the fluid diverter cylinder, the milipore filter device carries out work under operating conditions like this, continuous output filtrate, the piston that while part filtrate enters in fluid diverter cylinder and the propelling fluid diverter cylinder moves, until piston moves to the link place of fluid diverter cylinder and feed pump;
3) to n
1The milipore filter device carries out online anti-the cleaning:
Close n
1The feed liquid of milipore filter device enters transfer valve, filtrate output transfer valve and concentrate dump valve, closes transfer valve and the fluid diverter cylinder feed liquid dump valve of other milipore filter device communication of fluid diverter cylinders, opens n
1The anti-cleaning fluid transfer valve of milipore filter device and the transfer valve of communication of fluid diverter cylinder are opened the transfer valve that feed liquid enters the fluid diverter cylinder, realize n under the feed pump continuous operation
1The milipore filter device carries out online anti-the cleaning, at this moment, the part feed liquid of feed pump output enters fluid diverter cylinder and pushing piston and moves to the other end of fluid diverter cylinder, constantly injects feed liquid in the fluid diverter cylinder, piston extrudes and enters n with the filtrate in the fluid diverter cylinder in this moving process
1The milipore filter device flows out from anti-cleaning fluid transfer valve, has realized n
1The milipore filter device carries out online anti-the cleaning, and other milipore filter devices are still carrying out ultra-filtration process;
4) finish n
1After online anti-cleaning of milipore filter device, repeat n milipore filter device and carry out ultrafiltration and inject filtrate to the fluid diverter cylinder:
Open n
1The feed liquid of milipore filter device enters transfer valve and filtrate output transfer valve, opens the transfer valve of other milipore filter device communication of fluid diverter cylinders, opens fluid diverter cylinder feed liquid dump valve, closes n
1The anti-cleaning fluid transfer valve of milipore filter device, close feed liquid and enter the transfer valve of fluid diverter cylinder, this moment, n milipore filter device entered ultra-filtration process again, and the fluid diverter cylinder then enters continuous injection filtrate, and piston constantly moves and discharge by the feed liquid drain valve process of feed liquid;
5) constantly repeat with reference to 2), 3) way of step, realize n successively
2N
nThe online anti-cleaning process of milipore filter device.
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| CN201310290131.3A CN103357273B (en) | 2013-07-11 | 2013-07-11 | Online backwashing device and method in ultrafiltration process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106914136A (en) * | 2017-04-06 | 2017-07-04 | 华电水务工程有限公司 | A kind of ultrafiltration apparatus fluid reversing switching valve and changing method |
| CN107486019A (en) * | 2017-08-18 | 2017-12-19 | 合肥丰洁生物科技有限公司 | A kind of film filter and system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5512167A (en) * | 1994-06-08 | 1996-04-30 | Case Engineering & Laboratory, Inc. | Backpulse piston assembly for crossflow filters |
| CN101934197A (en) * | 2009-07-14 | 2011-01-05 | 中国制浆造纸研究院 | Multifunctional membrane separation device for treating pulping and paper-making waste water and separation method thereof |
| CN201728062U (en) * | 2009-10-28 | 2011-02-02 | 陈喆 | Automatic cleaning continuous cross-flow ultrafiltration device |
| CN202096887U (en) * | 2010-03-01 | 2012-01-04 | 旭化成化学株式会社 | Filter plant |
-
2013
- 2013-07-11 CN CN201310290131.3A patent/CN103357273B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5512167A (en) * | 1994-06-08 | 1996-04-30 | Case Engineering & Laboratory, Inc. | Backpulse piston assembly for crossflow filters |
| CN101934197A (en) * | 2009-07-14 | 2011-01-05 | 中国制浆造纸研究院 | Multifunctional membrane separation device for treating pulping and paper-making waste water and separation method thereof |
| CN201728062U (en) * | 2009-10-28 | 2011-02-02 | 陈喆 | Automatic cleaning continuous cross-flow ultrafiltration device |
| CN202096887U (en) * | 2010-03-01 | 2012-01-04 | 旭化成化学株式会社 | Filter plant |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106914136A (en) * | 2017-04-06 | 2017-07-04 | 华电水务工程有限公司 | A kind of ultrafiltration apparatus fluid reversing switching valve and changing method |
| CN106914136B (en) * | 2017-04-06 | 2023-06-23 | 华电水务工程有限公司 | Fluid reversing switching valve for ultrafiltration device and switching method |
| CN107486019A (en) * | 2017-08-18 | 2017-12-19 | 合肥丰洁生物科技有限公司 | A kind of film filter and system |
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| CN103357273B (en) | 2015-02-25 |
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