CN101785972B - Water treatment system with bidirectional cleaning function - Google Patents

Water treatment system with bidirectional cleaning function Download PDF

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Publication number
CN101785972B
CN101785972B CN2009100677783A CN200910067778A CN101785972B CN 101785972 B CN101785972 B CN 101785972B CN 2009100677783 A CN2009100677783 A CN 2009100677783A CN 200910067778 A CN200910067778 A CN 200910067778A CN 101785972 B CN101785972 B CN 101785972B
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Prior art keywords
control valve
cleaning
filtered fluid
film
parallel
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CN2009100677783A
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CN101785972A (en
Inventor
刘建立
王捷
于鸿来
张本善
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Tianjin Motimo Membrane Technology Co Ltd
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Tianjin Motimo Membrane Technology Co Ltd
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Abstract

The invention discloses a water treatment system with bidirectional cleaning function, and aims to provide a water treatment system capable of realizing bidirectional alternate cleaning. The upper water outlet of a double-end water outlet external-pressing membrane assembly is connected with an upper filtrate collecting conduit, while the lower water outlet is connected with a lower filtrate collecting conduit; the upper filtrate collecting conduit is connected with a first control valve and a second control valve; the lower filtrate collecting conduit is connected with a third control valve and a fourth control valve; the first control valve is connected in parallel with the third control valve and then is connected with a fifth control valve, a water pump and a seventh control valve in turn; one end of an eighth control valve is connected with a second connector of the water pump, while the other end is connected in parallel with the fifth control valve; one end of a sixth control valve is connected with a first connector of the water pump, while the other end is connected in parallel with the seventh control valve; and the second control valve is connected in parallel with the fourth control valve and then is connected with a residual cleaning solution outlet. The system can realize bidirectional alternate cleaning, improve the flushing effect on pollutants in a membrane cavity, and ensure the membrane cleaning efficiency and reflux recovery rate.

Description

Water treatment system with bidirectional cleaning function
Technical field
The present invention relates to water-treatment technology field, in particular, relate to a kind of water treatment system of utilizing hollow-fibre membrane to carry out water treatment with bidirectional cleaning function.
Background technology
But hollow fiber film assembly with its packed density high self-supporting, simple in structure, cost is low, characteristics such as back-washable have in water treatment field the most widely and use.Hollow fiber film assembly can be applicable to numerous areas such as PREPARATION OF ULTRA-PURE WATER, drink water purifying, sewage disposal and desalinization.According to the design feature of hollow fiber film assembly, can comprise two kinds of forms of single-ended water outlet of doughnut (be membrane fiber one end sealing, an end is as the collection channel of filtered fluid) and double water outlet end (being that two ends are all as the collection channel of filtered fluid).Because the form of double water outlet end is higher than single-ended water outlet membrane module water outlet efficient under the effect of equal film motive force excessively, so the form of the hollow fiber film assembly of double water outlet end is used more general.
It is to need the key issue that solves in the membrane filtration processes that film pollutes, and generally adopts the film cleaning method.For external-pressing film assembly, its general thinking is that the filtered fluid behind employing filtered fluid (referring to through the water behind the membrane filtration) or the adding chemical agent is implemented oppositely cleaning to film, promptly make cleaning fluid by the outside of hollow membrane fiber lumens reverse flow to film at pump (or under gravity effect), thereby the pollutant attached to film outer surface is peeled off, and membrane flux recovers.
The external-pressing film assembly of double water outlet end still adopts outlet pipeline usually when carrying out backwash, the filtered fluid outlet is the filter washing water inlet, therefore has certain drawback when cleaning.Backwash liquor is taken from film product water usually in the large-scale engineering, and water tank or pond microbial growth that long term storage is produced water also are vulnerable to outside pollution, can make to produce in the water as untimely removing and sneak into microorganism remains or particle, and anti-cleaning exerts an influence to film for this.The intracavity diameter of hollow membrane fiber less (<2mm), enter the fine particulate material that the cleaning fluid of membrane fiber inner chamber carries secretly and very easily stop up narrow and small membrane fiber inner chamber, it is not smooth to cause film to clean.The hollow fiber film assembly of double water outlet end is when backwash, and cleaning fluid enters inner chamber from the two ends of fiber, and most cleaning fluids can be transferred to the outside of film through film under the effect of pressure, and small part then can remain in the film inner chamber.The flow direction at two ends is relative when cleaning owing to the double water outlet end membrane module is counter, therefore the particle of carrying secretly in the backwash liquor can not see through and can't discharge the film inner chamber from face, bigger particle can be trapped in the film inner chamber and stop up runner, the material that particle is slightly little then can be attached to inner surface or stop up fenestra, forms the film inner chamber and pollutes.Because at present the doughnut membrane material that adopts belongs to asymmetric membrane more, and film effectively layer is many at the film outer surface, the therefore various films means of cleaning are polluted the film inner chamber of the fenestra distribution form of this " outer little in big " and are difficult to recover.
Summary of the invention
The objective of the invention is in order to overcome the deficiencies in the prior art part, a kind of water treatment system that realizes that two way alternate is cleaned is provided, overcoming existing cleaning technique easily causes membrane fiber inner chamber and inwall fenestra to stop up and difficult drawback of cleaning, reduce the possibility that the fine particle thing blocks film inner chamber runner, and the particle that is stranded in the film inner chamber can in time be discharged, improve the developing result of film cleaning, guarantee efficient and flux recovery rate that film cleans film inner chamber pollutant.
The present invention is achieved through the following technical solutions:
A kind of water treatment system with bidirectional cleaning function, comprise many group external pressed film assembly with double water outlet end, the upper end delivery port of every group of external pressed film assembly with double water outlet end is connected with upper end filtered fluid collection conduit respectively, the lower end delivery port is connected with lower end filtered fluid collection conduit respectively, it is characterized in that, described upper end filtered fluid collection conduit is connected with second control valve with first control valve respectively, described lower end filtered fluid collection conduit is connected with the 4th control valve with the 3rd control valve respectively, described first control valve with after the 3rd control valve is in parallel with the 5th control valve, water pump, the 7th control valve connects successively, described the 7th control valve is that the filter washing water inlet is connected with the filtered fluid outlet, the 8th control valve one end is connected with second interface of water pump, the other end is in parallel with the 5th control valve, the 6th control valve one end is connected with first interface of water pump, and the other end is in parallel with the 7th control valve; Be connected with the residue rinse liquid outlet after described second control valve and the 4th control valve parallel connection.
Described external pressed film assembly with double water outlet end is the external pressure curtain type film assembly or the column-type film components of double water outlet end.
The present invention has following technique effect:
Water treatment system with bidirectional cleaning function of the present invention can be by the combination control to each control valve, the realization two way alternate is cleaned, thereby having overcome existing cleaning technique easily causes membrane fiber inner chamber and inwall fenestra to stop up and difficult drawback of cleaning, can reduce the possibility that the fine particle thing blocks film inner chamber runner, and the particle that is stranded in the film inner chamber can in time be discharged, improve the developing result of film cleaning, guarantee efficient and flux recovery rate that film cleans film inner chamber pollutant.And, can adopt the mode of operation of excessive cleaning, promptly adopt excessive cleaning fluid, part cleaning fluid can see through film to the film outside from the film inner chamber, another part is discharged via residue cleaning fluid discharge mouth, can make the higher fluid velocity of maintenance in the film inner chamber, the particle in the inner chamber is discharged timely and effectively, thereby ensure scouring effect the film inner chamber.
Description of drawings
Fig. 1 has the water treatment system schematic diagram of bidirectional cleaning function for the present invention;
The schematic diagram when water treatment system that Fig. 2 has a bidirectional cleaning function for the present invention is carried out water filtration;
Fig. 3 has a bidirectional cleaning function for the present invention water treatment system schematic diagram when the upper end is cleaned;
Fig. 4 has a bidirectional cleaning function for the present invention water treatment system schematic diagram when the lower end is cleaned.
The specific embodiment
Below in conjunction with the drawings and specific embodiments to the detailed description of the invention.
The schematic diagram of the water treatment system with bidirectional cleaning function of the present invention as shown in Figure 1, comprise many group external pressed film assembly with double water outlet end 1, the upper end delivery port of every group of external pressed film assembly with double water outlet end is connected with upper end filtered fluid collection conduit 2 respectively, the lower end delivery port is connected with lower end filtered fluid collection conduit 13 respectively, upper end filtered fluid collection conduit 2 is connected with second control valve 3 with first control valve 4 respectively, and lower end filtered fluid collection conduit 13 is connected with the 4th control valve 11 with the 3rd control valve 12 respectively.First control valve 4 is connected with the 5th control valve 6, water pump 8, the 7th control valve 9 successively with the 3rd control valve 12 backs in parallel, and the 7th control valve 9 is that the filter washing water inlet is connected with the filtered fluid outlet.The 8th control valve 7 one ends are connected with second interface 15 of water pump 8, and the other end is in parallel with the 5th control valve 6, and the 6th control valve 10 1 ends are connected with first interface 14 of water pump 8, and the other end is in parallel with the 7th control valve 9.Described second control valve 3 is connected with residue rinse liquid outlet 5 with the 4th control valve 11 backs in parallel.Wherein, external pressed film assembly with double water outlet end is the external pressure curtain type film assembly of double water outlet end or column-type film components etc.Each control valve can be an autocontrol valve, also can be hand control valve.
Combination by each control valve can be controlled the mode of operation that the present invention has the water treatment system of bidirectional cleaning function, can provide hydrodynamic force by water pump or gravity.The filtered fluid collection conduit can be served as anti-pipe blow-through when anti-the cleaning, and provides the backwash motive force by water pump or gravity.
Fig. 2 is the schematic diagram when having the bidirectional cleaning function water treatment system and carrying out water filtration of the present invention, first control valve 4, the 3rd control valve 12, the 5th control valve 6, the 7th control valve 9 are opened, and second control valve 3, the 4th control valve 11, the 6th control valve 10, the 8th control valve 7 are closed.External pressed film assembly with double water outlet end 1 filters filtered fluid under the swabbing action that water pump 8 produces.Pending waste water or sewage enter upper end filtered fluid collection conduit 2 from the upper end delivery port respectively after filtering through a plurality of membrane modules, enter lower end filtered fluid collection conduit 13 from the lower end delivery port, after filtered fluid compiles by first control valve 4 on the filtered fluid collection conduit of upper end and the 3rd control valve 12 on the filtered fluid collection conduit of lower end, behind the 5th control valve 6, water pump 8, the 7th control valve 9, enter filtered fluid from the filtered fluid outlet and compile house steward's centralized collection.
After film is polluted, cross film pressure and raise, implement instead to clean.The mode that adopts two way alternate to clean during anti-the cleaning.
Under first kind of pattern, cleaning fluid enters the membrane module inner chamber from upper end filtered fluid collection conduit.Fig. 3 has the schematic diagram of bidirectional cleaning function water treatment system when the upper end is cleaned for of the present invention, first control valve 4, the 4th control valve 11, the 6th control valve 10, the 8th control valve 7 are opened, and second control valve 3, the 3rd control valve 12, the 5th control valve 6, the 7th control valve 9 are closed.Adopt the mode of operation of excessive cleaning, cleaning fluid self-cleaning liquid inlet enters, under the effect of water pump 8 or gravity, enter external pressed film assembly with double water outlet end 1 inner chamber via the 6th control valve 10, water pump 8, the 8th control valve 7, first control valve 4 and upper end filtered fluid collection conduit 2, a part sees through film and is transferred to the film outside, another part is via lower end filtered fluid collection conduit 13 and the 4th control valve 11, and is final by 5 discharges of residue cleaning fluid outlet.
Afterwards, the second kind of pattern that adopts cleaning fluid to enter the membrane module inner chamber from lower end filtered fluid collection conduit, Fig. 4 has the schematic diagram of bidirectional cleaning function water treatment system when the lower end is cleaned for of the present invention, under this kind pattern, second control valve 3, the 3rd control valve 12, the 6th control valve 10, the 8th control valve 7 are opened, and first control valve 4, the 4th control valve 11, the 5th control valve 6, the 7th control valve 9 are closed.Adopt the mode of operation of excessive cleaning, cleaning fluid self-cleaning liquid inlet enters, under the effect of water pump 8 or gravity, enter the membrane module inner chamber via the 6th control valve 10, water pump 8, the 8th control valve 7, the 3rd control valve 12 and lower end filtered fluid collection conduit 13, a part sees through film and is transferred to the film outside, another part is via the upper end filtered fluid collection conduit 2 and second control valve 3, and is final by 5 discharges of residue cleaning fluid outlet.Through above-mentioned alternately cleaning process, the pollutant attached to film outer surface is peeled off, membrane flux recovers, the cleaning process of intact pair of films.
More than alternately cleaning way can guarantee that the particle of carrying secretly in the cleaning fluid can not stop up the membrane fiber inner chamber, owing to adopt excessive cleaning way, can make the higher fluid velocity of maintenance in the film inner chamber simultaneously, and the particle in the inner chamber is discharged timely and effectively.
Technical scheme of the present invention can be applicable to the water treatment system that the external pressure hollow fiber film assembly of the double water outlet end of curtain formula, pillar and other form at present commonly used is formed, and the big I of scale is made up of several even dozens of membrane module according to actual needs simultaneously.
Although relate to a kind of water treatment system and carried out special description disclosed with bidirectional cleaning function with reference to embodiment, embodiment described above is illustrative and not restrictive, under the situation that does not break away from the spirit and scope of the present invention, all variations and modification are all within the scope of the present invention.

Claims (2)

1. water treatment system with bidirectional cleaning function, comprise many group external pressed film assembly with double water outlet end, the upper end delivery port of every group of external pressed film assembly with double water outlet end is connected with upper end filtered fluid collection conduit respectively, the lower end delivery port is connected with lower end filtered fluid collection conduit respectively, it is characterized in that, described upper end filtered fluid collection conduit is connected with second control valve with first control valve respectively, described lower end filtered fluid collection conduit is connected with the 4th control valve with the 3rd control valve respectively, described first control valve with after the 3rd control valve is in parallel with the 5th control valve, water pump, the 7th control valve connects successively, described the 7th control valve is that the filter washing water inlet is connected with the filtered fluid outlet, the 8th control valve one end is connected with second interface of water pump, the other end is in parallel with the 5th control valve, the 6th control valve one end is connected with first interface of water pump, and the other end is in parallel with the 7th control valve; Be connected with the residue rinse liquid outlet after described second control valve and the 4th control valve parallel connection.
2. the water treatment system with bidirectional cleaning function according to claim 1 is characterized in that, described external pressed film assembly with double water outlet end is the external pressure curtain type film assembly or the column-type film components of double water outlet end.
CN2009100677783A 2009-01-23 2009-01-23 Water treatment system with bidirectional cleaning function Active CN101785972B (en)

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101508763B1 (en) 2012-12-29 2015-04-07 제일모직주식회사 Hollow fiber membrane module using positive pressure and back washing method using the same
CN103223297B (en) * 2013-04-28 2015-06-10 杭州水处理技术研究开发中心有限公司 Ultrafiltration membrane integration device with double ends for water production and module
CN104174293A (en) * 2014-08-27 2014-12-03 南京万德斯环保科技有限公司 Device for relieving or preventing blockage of external tubular ultra-filtration membrane
CN105879692A (en) * 2016-04-28 2016-08-24 佘宏栓 Turbulence-method vertical offline reverse osmosis membrane cleaning system and method
CN108640312A (en) * 2018-05-24 2018-10-12 姚安迪 A kind of efficient domestic sewage processing unit

Citations (4)

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Publication number Priority date Publication date Assignee Title
CN2369752Y (en) * 1998-12-08 2000-03-22 天津纺织工学院膜天膜技术工程公司 Film separator capable of efficiently cleaning
CN1311055A (en) * 2001-02-23 2001-09-05 天津膜天膜工程技术有限公司 Two-way working film separation method and equipment therefor
CN1480247A (en) * 2002-09-06 2004-03-10 天津膜天膜工程技术有限公司 Membrane separation device composed of multiple groups of membrane module and its operating method
CN201357054Y (en) * 2009-01-23 2009-12-09 天津膜天膜科技有限公司 Membrane module operating device with bidirectional washing function

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2369752Y (en) * 1998-12-08 2000-03-22 天津纺织工学院膜天膜技术工程公司 Film separator capable of efficiently cleaning
CN1311055A (en) * 2001-02-23 2001-09-05 天津膜天膜工程技术有限公司 Two-way working film separation method and equipment therefor
CN1480247A (en) * 2002-09-06 2004-03-10 天津膜天膜工程技术有限公司 Membrane separation device composed of multiple groups of membrane module and its operating method
CN201357054Y (en) * 2009-01-23 2009-12-09 天津膜天膜科技有限公司 Membrane module operating device with bidirectional washing function

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