CN103566769B - Method for alleviating pollution of roll-type membrane assemblies - Google Patents
Method for alleviating pollution of roll-type membrane assemblies Download PDFInfo
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- CN103566769B CN103566769B CN201310532745.8A CN201310532745A CN103566769B CN 103566769 B CN103566769 B CN 103566769B CN 201310532745 A CN201310532745 A CN 201310532745A CN 103566769 B CN103566769 B CN 103566769B
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Abstract
The invention discloses a method for alleviating pollution of roll-type membrane assemblies. The method comprises the following steps: (1) adjusting roll-type membrane assemblies connected in parallel to operate in a serial connection manner through pipelines and valves; (2) changing the direction of feed liquid entering the roll-type membrane assemblies by adjusting the valves so as to alleviate the pollution of the roll-type membrane assemblies. With the method, the pollution degree of the roll-type membrane assemblies can be reduced through the adjustment of the valves and the pipelines, and thus the working operation time of the membrane assemblies is prolonged, and the cleaning frequency is reduced; according to the method, the operability is high, the investment operation cost is low and popularization and application are convenient.
Description
(1) technical field
The present invention relates to a kind of falling and subtract the method that membrane module working operating mode causes fouling membrane, particularly the method subtracting rolled membrane module fouling membrane falls in a kind of direction of alternately switching the feed.
(2) background technology
In recent years, rolled membrane module, owing to balancing the important indicators such as the simplification of operation, the controlling of fouling membrane, the size of infiltration capacity and bulk density preferably, is widely used in the extraction field of valuable components in the concentrated and pharmaceuticals industry of desalinization, sanitary sewage wastewater treatment and recovery, food processing and product in practical application in industry.
Structure and the spiral heat exchanger of rolled membrane module are similar, passive material (being generally filter) inserts in the film bag of three limit sealings, the sack that another side does not seal is connected with permeate collection pipe, then the charging filter of guide functions has been lining with, film bag and feeding liquid filter are wrapped on permeate collection pipe successively, composition rolled membrane module (as Fig. 1).A key character of rolled membrane module is: feeding liquid runner and penetrating fluid runner all also exist filter, this filter reticulates distribution, modal is to be connect with non-woven form tower by cylindrical mesh to form, and it is used for two adjacent diaphragms of diffusion barrier bag, thus forms runner.Filter Main Function has 2 points: one, and promote turbulent flow, mass transfer enhancement, the staggered flowing caused thus and eddy current can reduce concentration polarization phenomenon, increases membrane flux, alleviates the trend of fouling membrane; Its two, filter also has supporting role, and it can make two membranes be in released state, thus stabilizes the structure of runner.
Although rolled membrane module has lot of advantages, due to the inevitable property of fouling membrane, there is some shortcoming: clean relatively frequently, replacing diaphragm is cumbersome, easily block, above-mentioned shortcoming limits further genralrlization and the application of this assembly.Rolled membrane module pollutes four main feature (see figure 2)s: one, and membrane module feed end exists the accumulated plugging of a small amount of suspended material; Its two, on the flow direction of feed liquid in membrane module, due to chemosmotic generation, the concentration of feed liquid is increased gradually, cause fouling membrane degree aggravate (pollution level of the port of export is larger than feed end); Its three, although filter can reduce the impact of concentration polarization, its introducing can cause retaining of large particulate matter in feed liquid, and cause the pollution problem of membrane module, feeding liquid filter adds the feed liquid pressure loss in the flowing direction simultaneously; Finally, the pressure on flow direction loses gradually, causes Hydrodynamic turbulence degree to reduce, and fouling membrane aggravates.
At present, the rolled membrane module in commercial Application adopts the operational mode of single direction charging substantially, causes membrane module can not to work long hours operation, and flux decline speed is fast, and cleaning is frequent.For the feature that above-mentioned rolled film pollutes, improve the service condition of rolled membrane module, change the method for operation, control is fallen and subtracts fouling membrane and will play key effect.
(3) summary of the invention
The object of the invention is to provide one and meets engineer applied reality, easy to utilize again, and invest, the method alleviating rolled membrane module fouling membrane that operating cost is low.
The technical solution used in the present invention is:
The invention provides a kind of fall subtract rolled membrane module pollute method, described method is: 1. by the rolled membrane module be connected in parallel by pipeline and valve regulated be series connection mode run, described rolled membrane module comprises charging aperture, discharging opening and permeate outlet, the described rolled membrane module structure be connected in parallel is: the first charging aperture of the first rolled membrane module is by the first feeding pipe, second charging aperture of the second rolled membrane module is parallel-connected to feed pump by the second feeding pipe, first discharging opening of the first rolled membrane module is communicated with the second discharging opening of the second rolled membrane module, first permeate outlet of the first rolled membrane module and the second permeate of the second rolled membrane module export in parallel rear by being with the pipeline of flowmeter (71) to be connected with permeate collecting tank (6), the mode of described series connection connects pipeline on the first feeding pipe and the second feeding pipe, described connecting pipe is established the 3rd valve and the 4th valve, between the 3rd valve, the 4th valve, establish an opening to be communicated with trapped fluid collecting tank (8) by the pipeline of band flowmeter (72), described connecting pipe and the first feeding pipe tie point to the pipeline of feed pump add the first valve, described connecting pipe and the second feeding pipe tie point to the pipeline of feed pump add the second valve, 2. change by control valve direction that feed liquid enters rolled membrane module to subtract rolled membrane module pollute to fall, describedly control by valve regulated the method for operating that feed liquid enters rolled membrane module direction and be: when rolled membrane module runs, first the first valve and the 4th valve is opened, close the second valve and the 3rd valve, feed liquid enters the first rolled membrane module through feed pump by the first feeding pipe, trapped fluid enters the second rolled membrane module through the second discharging opening after being flowed out by the first discharging opening, pipeline through band flowmeter (72) after being flowed out by the second charging aperture again enters trapped fluid collecting tank (8), the permeate of the first rolled membrane module and the permeate of the second rolled membrane module export respectively by the first permeate, the pipeline of the second permeate outlet band flowmeter (71) flows into permeate collecting tank (6), after running 5 ~ 40min, close the first valve and the 4th valve, open the second valve and the 3rd valve, feed liquid enters second rolled membrane module by the second feeding pipe through the second charging aperture by feed pump, trapped fluid enters the first rolled membrane module through the first discharging opening after the second discharging opening flows out, trapped fluid collecting tank (8) is entered by connecting pipe after being flowed out by the first charging aperture again, the permeate of the first rolled membrane module and the permeate of the second rolled membrane module export respectively by the first permeate, the pipeline of the second permeate outlet band flowmeter (71) flows into permeate collecting tank (6), after running 5 ~ 40min, open the first valve and the 4th valve again, close the second valve and the 3rd valve, circular flow subtracts rolled membrane module fouling membrane to fall, it is out of service when flowmeter (71) reading is shown as less than 20% of original value (flow value when namely bringing into operation), carry out membrane module cleaning.
Further, described feed liquid also comprised and feed liquid is passed into rolled membrane module processes before entering rolled membrane module, and described rolled membrane module is single rolled membrane module, the rolled membrane modules of 2 series connection or the rolled membrane module of two or more series connection.
Further, described in the rolled membrane module that is connected in parallel be 1 ~ 2 group, often group is made up of two rolled membrane modules.
Further, described feed liquid salt content is 0 ~ 5%, soluble protein is 0 ~ 50mg/mL, amino-acid nitrogen is 0 ~ 20mg/mL.
Further, described feed liquid is silver anchovy boiling soup juice, shrimp boiling soup juice, mussel boiling soup juice, abalone cooking liquor or Penaeus Vannmei cooking liquor.
Compared with prior art, beneficial effect of the present invention is mainly reflected in: the present invention, by the adjustment of valve, pipeline, can fall and subtract rolled membrane module pollution level, the work running time of membrane component and prolong, reduces cleaning frequency; The method strong operability, investment operating cost is low, easy to utilize.
(4) accompanying drawing explanation
Fig. 1 is rolled film structural representation.
Fig. 2 is rolled membrane module fouling membrane structural representation.
Fig. 3 is the process chart that control valve changes that feedstock direction realizes the pollution of degraded rolled membrane module.
Fig. 4 is the rolled membrane module schematic diagram of series connection in embodiment 1.
(5) detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described further, but protection scope of the present invention is not limited in this:
With reference to Fig. 3, the invention provides and a kind ofly fall the method subtracting rolled membrane module and pollute, described method is: 1. run by the mode that pipeline and valve regulated are series connection by the rolled membrane module be connected in parallel, described rolled membrane module comprises charging aperture, discharging opening and permeate outlet, the described rolled membrane module structure be connected in parallel is: the first charging aperture 11 of the first rolled membrane module 1 is by the first feeding pipe 51, second charging aperture 21 of the second rolled membrane module 2 is parallel-connected to feed pump 4 by the second feeding pipe 52, first discharging opening 12 of the first rolled membrane module 1 is communicated with the second discharging opening 22 of the second rolled membrane module 2, first permeate outlet 13 of the first rolled membrane module and the second permeate of the second rolled membrane module export 23 rear passing through in parallel and are with the pipeline 55 of flowmeter 71 to be connected with permeate collecting tank 6, the mode of described series connection for connect pipeline 56 on the first feeding pipe and the second feeding pipe, described connecting pipe is established the 3rd valve 33 and the 4th valve 34, between the 3rd valve, the 4th valve, establish an opening to be communicated with trapped fluid collecting tank 8 by the pipeline 57 of band flowmeter 72, described connecting pipe and the first feeding pipe tie point to the pipeline of feed pump add the first valve 31, described connecting pipe and the second feeding pipe tie point to the pipeline of feed pump add the second valve 32, 2. change by control valve direction that feed liquid enters rolled membrane module to subtract rolled membrane module pollute to fall, describedly control by control valve the method that feed liquid enters rolled membrane module direction and be: when rolled membrane module runs, first the first valve 31 and the 4th valve 34 is opened, close the second valve 32 and the 3rd valve 33, feed liquid enters the first rolled membrane module 1 through feed pump 4 by the first feeding pipe 51, trapped fluid enters the second rolled membrane module through the second discharging opening 22 after being flowed out by the first discharging opening 12, trapped fluid collecting tank 8 is entered by pipeline 57 after being flowed out by the second charging aperture 21 again, the permeate of the first rolled membrane module and the permeate of the second rolled membrane module export 13 respectively by the first permeate, the pipeline 55 that second permeate exports 23 band flowmeters 71 flows into permeate collecting tank 6, after running 5 ~ 40min, close the first valve and the 4th valve, open the second valve and the 3rd valve, feed liquid enters second rolled membrane module by the second feeding pipe through the second charging aperture 21 by feed pump, trapped fluid enters the first rolled membrane module through the first discharging opening 12 after the second discharging opening 22 flows out, trapped fluid collecting tank 8 is entered by connecting pipe 57 after being flowed out by the first charging aperture 11 again, the permeate of the first rolled membrane module and the permeate of the second rolled membrane module export respectively by the first permeate, the pipeline of the second permeate outlet band flowmeter 71 flows into permeate collecting tank 6, after running 5 ~ 40min, open the first valve and the 4th valve again, close the second valve and the 3rd valve, circular flow subtracts rolled membrane module fouling membrane to fall, it is out of service when flowmeter 71 reading is shown as less than 20% of original value, carry out membrane module cleaning.
Embodiment 1
Adopt micro-filtration and nanofiltration GC-MS to concentrate the silver anchovy boiling soup juice (containing salt 22mg/mL, water soluble protein is 13mg/mL) in anchovy processing, film concentration process as shown in Figure 4.The group film that micro-filtration adopts two rolled membrane modules (rolled membrane module 1 ' and rolled membrane module 2 ') to connect carries out pretreatment, using the permeate through micro-filtration process as the feed liquid of nanofiltration process, nanofiltration adopts and is processed by the rolled membrane module of 2 groups of parallel connections, often group is in series by 2 rolled membrane modules, to be adjusted to by 4 rolled membrane modules to be connected in series by valve and pipeline.
Micro-filtration rolled membrane module is configured to: rolled membrane module 1 ' charging aperture is communicated with feed pump, feed liquid is entered by the charging aperture of rolled membrane module 1 ', trapped fluid enters rolled membrane module 2 ' by the discharging opening of rolled membrane module 2 ' after being flowed out by the discharging opening of rolled membrane module 1 ', then enters trapped fluid collecting tank 10 through the pipeline with flowmeter 74 after being flowed out by the charging aperture of rolled membrane module 2 '; Permeate collecting tank 9 is entered, as the raw material of nanofiltration process through the pipeline with flowmeter 73 after the permeate outlet of rolled membrane module 1 ' and the permeate outlet of rolled membrane module 2 '.
Described nanofiltration adopts 2 groups of rolled membrane module parallel connections to process, often organize rolled membrane module in series by 2 rolled membrane modules, with valve, 4 rolled membrane modules are adjusted to series system by pipeline to be connected, described rolled membrane module comprises the outlet of charging aperture, discharging opening and permeate.The connected mode of 4 rolled membrane modules in series group of film is: be connected with feed pump by the pipeline 51 of the charging aperture 11 of rolled membrane module 1 by band valve 31, the charging aperture 21 of rolled membrane module 2 is connected with feed pump by the pipeline 52 of band valve 32, the discharging opening 12 of rolled membrane module 1 passes through pipeline connection with the discharging opening 32 of rolled membrane module 3, the charging aperture 31 of rolled membrane module 3 is communicated with the charging aperture 41 of rolled membrane module 4 by pipeline, the discharging opening 42 of rolled membrane module 4 passes through pipeline connection with the discharging opening 22 of rolled membrane module 2, the permeate outlet 13 of rolled membrane module 1 exports 23 with the permeate of rolled membrane module 2 and is connected on the pipeline 55 of the band flowmeter 71 be communicated with permeate collecting tank 6 by pipeline 54, rolled membrane module 3 permeate outlet 33 and the permeate of rolled membrane module 4 export 43 by pipeline 54 ' be connected to be communicated with permeate collecting tank 6 with on the pipeline 55 of flowmeter 71,
Describedly change by control valve the method that feed liquid enters rolled membrane module direction and be: be communicated with the pipeline 56 of valve 34 with valve 33 with one between pipeline 51 and pipeline 52, one end of described pipeline 56 is between valve 31 and charging aperture 11, the other end between valve 32 and charging aperture 21, the valve 33 on described pipeline 56 and draw the pipeline 57 with flowmeter 72 that connects trapped fluid collecting tank 8 between valve 34, when rolled membrane module runs, first Open valve 31 and valve 34, valve-off 32 and valve 33, feed liquid enters rolled membrane module 1 through feed pump by pipeline 51, trapped fluid enters rolled membrane module 3 through material liquid outlet 32 after material liquid outlet 12 flows out, rolled membrane module 4 is entered again by charging aperture 41, trapped fluid enters rolled membrane module 2 through discharging opening 22 after discharging opening 42 flows out, trapped fluid collecting tank 8 is entered through pipeline 57 after charging aperture 21 flows out, the permeate of rolled membrane module 1 is through permeate outlet 13, the permeate of rolled membrane module 2 is through permeate outlet 23, the permeate of rolled membrane module 3 is through permeate outlet 33, the permeate of rolled membrane module 4 enters permeate collecting tank 6 through pipeline 54 and pipeline 55 after permeate outlet 43 is flowed out, after running 30min, valve-off 31 and valve 34, Open valve 32 and valve 33, feed liquid is introduced into membrane module 2 and then after rolled membrane module 4 and rolled membrane module 3, enters membrane module 1 again and run, to run after 30min Open valve 31 and valve 34 again, valve-off 32 and valve 33, circular flow subtracts rolled membrane module fouling membrane to fall, the stop cleaning when flowmeter 71 reaches 5L/h.
Adopt micro-filtration and nanofiltration GC-MS to concentrate the silver anchovy boiling soup juice (containing salt 22mg/mL, water soluble protein is 13mg/mL) in anchovy processing, film concentration process as shown in Figure 4.First by two groups of series connection micro-filtration membrane modules, (feed liquid enters rolled membrane module 1 ' by charging aperture through feed pump to cloves cooking liquor after simple filtration process, trapped fluid enters rolled membrane module 2 ' by pipeline and enters trapped fluid collecting tank 10 by the pipeline with flowmeter 74, permeate enters permeate collecting tank 9 through the pipeline with flowmeter 73, macromolecular substances is retained concentrated, micro-filtration pressure 0.2MPa, 0.1 μm, microfiltration membranes aperture.Trapped fluid collecting tank 10 collects micro-filtration trapped fluid, and permeate collecting tank 9 collects MF permeate liquid.MF permeate liquid (i.e. the permeate of permeate collecting tank 9 collection) enters the rolling nanofiltration membrane components of 4 series connection by pipeline, retain concentrated, nanofiltration pressure 1MPa, molecular cut off 150 ~ 300Da to small-molecule substance.During nanofiltration operation, first open valve 31, valve 34, valve-off 32, valve 33, material enters rolled membrane module by feed pump supercharging, and permeate collecting tank 6 collects nanofiltration membrane component permeate, trapped fluid collecting tank 8 collection membrane assembly trapped fluid; After running 30min, open valve 32, valve 33 in order, valve-off 31, valve 34; Run after 30min, rule operation as stated above, alternately changes the feedstock direction of silver anchovy cooking liquor repeatedly, until after permeate flow reduces and will clean the degree of film, shut down and clean.In nanofiltration process, by the adjustment of valve, pipeline, repeatedly alternately change the feedstock direction of silver anchovy cooking liquor, make nanofiltration work extend 29% running time, and scavenging period shortens 21%, operating efficiency is obviously high than the method for operation of single nanofiltration feedstock direction.This embodiment can be used for protein and amino acid whose recovery in the pressed liquor after fish meal machining cooking equally and concentrates.
Embodiment 2
Adopt micro-filtration and nanofiltration GC-MS to concentrate the shrimp boiling soup juice (containing salt 4.7%, water soluble protein is 8mg/mL) in dried small shrimp processing, concrete operations scheme is identical with embodiment 1.Difference is that micro-filtration have employed a rolled membrane module, and nanofiltration still adopts four rolled membrane module series connection.Repeatedly alternately change the feedstock direction of dried small shrimp cooking liquor in nanofiltration process, make NF membrane Clean after every time lengthening 38%, and cleaning frequency reduces by 15%, operating efficiency improves.
Embodiment 3
Concentration is carried out to mussel boiling soup juice (add without salt, water soluble protein is 23mg/mL).Concrete operations scheme is identical with embodiment 1.Adopt the concentration technology of Fig. 4, in nanofiltration process, repeatedly alternately change the feedstock direction boiling thick soup, volume concentration 5 times, work simultaneously and extend 20% running time, nanofiltration work extends 25% running time, and cleaning frequency reduces 15-20%, and operating efficiency significantly improves.
Embodiment 4
Concentration is carried out to abalone boiling soup juice (salt 2%, water soluble protein is 19mg/mL).Adopt the technique concentrated abalone boiling soup juice of Fig. 4, the nanofiltration membrane component work in concentration process extends 43% running time, and cleaning frequency reduces by 25%, improves the running time of membrane module.
Embodiment 5
Carry out recovery to Penaeus Vannmei boiling soup juice (salt content is 1.5%, and soluble protein is 5mg/mL, and amino-acid nitrogen is 0.2mg/mL) to concentrate.Concrete operations scheme is identical with embodiment 1.Adopt the technique of Fig. 4, make nanofiltration membrane component work extend 25% running time, cleaning frequency reduces by 17%, improves the running time of membrane module.
Claims (5)
1. fall the method subtracting rolled membrane module and pollute, it is characterized in that described method is: 1. the rolled membrane module be connected in parallel is run by the mode that pipeline and valve regulated are series connection, described rolled membrane module comprises charging aperture, discharging opening and permeate outlet, the described rolled membrane module structure be connected in parallel is: the first charging aperture of the first rolled membrane module is by the first feeding pipe, second charging aperture of the second rolled membrane module is parallel-connected to feed pump by the second feeding pipe, first discharging opening of the first rolled membrane module is communicated with the second discharging opening of the second rolled membrane module, first permeate outlet of the first rolled membrane module and the second permeate of the second rolled membrane module export in parallel rear by being with the pipeline of flowmeter (71) to be connected with permeate collecting tank (6), the mode of described series connection connects pipeline on the first feeding pipe and the second feeding pipe, described connecting pipe is established the 3rd valve and the 4th valve, between the 3rd valve, the 4th valve, establish an opening to be communicated with trapped fluid collecting tank (8) by the pipeline of band flowmeter (72), described connecting pipe and the first feeding pipe tie point to the pipeline of feed pump add the first valve, described connecting pipe and the second feeding pipe tie point to the pipeline of feed pump add the second valve, 2. control by control valve direction that feed liquid enters rolled membrane module to subtract rolled membrane module pollute to fall, describedly control by control valve the method that feed liquid enters rolled membrane module direction and be: when rolled membrane module runs, first the first valve and the 4th valve is opened, close the second valve and the 3rd valve, feed liquid enters the first rolled membrane module through feed pump by the first feeding pipe, trapped fluid enters the second rolled membrane module through the second discharging opening after being flowed out by the first discharging opening, trapped fluid collecting tank (8) is entered after being flowed out by the second charging aperture again, the permeate of the first rolled membrane module and the permeate of the second rolled membrane module export respectively by the first permeate, the pipeline of the second permeate outlet band flowmeter (71) flows into permeate collecting tank (6), after running 5 ~ 40min, close the first valve and the 4th valve, open the second valve and the 3rd valve, feed liquid enters second rolled membrane module by the second feeding pipe through the second charging aperture by feed pump, trapped fluid enters the first rolled membrane module through the first discharging opening after the second discharging opening flows out, trapped fluid collecting tank (8) is entered by connecting pipe after being flowed out by the first charging aperture again, the permeate of the first rolled membrane module and the permeate of the second rolled membrane module export respectively by the first permeate, the pipeline of the second permeate outlet band flowmeter (71) flows into permeate collecting tank (6), after running 5 ~ 40min, open the first valve and the 4th valve again, close the second valve and the 3rd valve, circular flow subtracts rolled membrane module fouling membrane to fall, it is out of service when flowmeter (71) reading is shown as less than 20% of original value, carry out membrane module cleaning.
2. the method subtracting rolled membrane module and pollute is fallen as claimed in claim 1, it is characterized in that described feed liquid also comprised before entering rolled membrane module feed liquid is passed into rolled membrane module to process, described rolled membrane module is single rolled membrane module, the rolled membrane modules of 2 series connection or the rolled membrane module of two or more series connection.
3. fall the method subtracting rolled membrane module and pollute as claimed in claim 1, the rolled membrane module be connected in parallel described in it is characterized in that is 1 ~ 2 group, and often group is made up of two rolled membrane modules.
4. as described in one of claim 1 ~ 3, fall the method subtracting rolled membrane module and pollute, it is characterized in that described feed liquid salt content is 0 ~ 5%, soluble protein is 0 ~ 50 mg/mL, amino-acid nitrogen is 0 ~ 20mg/mL.
5. fall the method subtracting rolled membrane module and pollute as claimed in claim 4, it is characterized in that described feed liquid is silver anchovy boiling soup juice, shrimp boiling soup juice, mussel boiling soup juice, abalone cooking liquor or Penaeus Vannmei cooking liquor.
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| JP2005081273A (en) * | 2003-09-09 | 2005-03-31 | Yanmar Co Ltd | Method for operating activated sludge treatment system and membrane separation unit used for its operation method |
| CN202876665U (en) * | 2012-10-29 | 2013-04-17 | 东莞日之泉蒸馏水有限公司 | Reverse osmosis membrane cleaning and sterilizing device |
| CN103331102A (en) * | 2013-06-21 | 2013-10-02 | 山西太钢不锈钢股份有限公司 | Offline cleaning and evaluating device of reverse osmosis membrane element and application method of device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005081273A (en) * | 2003-09-09 | 2005-03-31 | Yanmar Co Ltd | Method for operating activated sludge treatment system and membrane separation unit used for its operation method |
| CN202876665U (en) * | 2012-10-29 | 2013-04-17 | 东莞日之泉蒸馏水有限公司 | Reverse osmosis membrane cleaning and sterilizing device |
| CN103331102A (en) * | 2013-06-21 | 2013-10-02 | 山西太钢不锈钢股份有限公司 | Offline cleaning and evaluating device of reverse osmosis membrane element and application method of device |
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