CN201458865U - Reverse-osmosis film water treatment system with high recycling rate - Google Patents

Reverse-osmosis film water treatment system with high recycling rate Download PDF

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Publication number
CN201458865U
CN201458865U CN2009201092734U CN200920109273U CN201458865U CN 201458865 U CN201458865 U CN 201458865U CN 2009201092734 U CN2009201092734 U CN 2009201092734U CN 200920109273 U CN200920109273 U CN 200920109273U CN 201458865 U CN201458865 U CN 201458865U
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reverse osmosis
osmosis membrane
reverse
film
water
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CN2009201092734U
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韦兰春
套格图
毛文斌
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Beijing CEC Power Technology Co Ltd
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Beijing CEC Power Technology Co Ltd
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Abstract

The utility model discloses a reverse-osmosis film water treatment system with high recycling rate, which comprises a pretreatment device and a reverse-osmosis device. The pretreatment device comprises a disc type filter, an ultra-filtration system and a sodium ion exchanger. The reverse-osmosis device comprises two reverse-osmosis film assemblies. A cartridge filter and a pH value adjusting device are arranged between the sodium ion exchanger and the reverse-osmosis device. The rigidity of water is removed by the sodium ion exchanging method, and a reverse-osmosis film runs under high pH value, so as to effectively prevent film pollution and reduce the number of times of film cleaning, thereby greatly increasing the water recycling rate and not affecting the service life of the film. The reverse-osmosis device adopts a dense water inner circulating two-segment type film system so as to reduce film pieces and realize high recycling rate. The reverse-osmosis film water treatment system has the characteristics of high automation degree, convenient maintenance as well as running and the like.

Description

High-recovery reverse osmosis membrane water treatment system
Technical field
The utility model relates to a kind of reverse osmosis membrane water technology, relates in particular to a kind of high-recovery reverse osmosis membrane water treatment system.
Background technology
The method of Demineralized Water Production is a lot, as: low-temperature distillation, multistage flash evaporation, pressure steam distillation, ion-exchange and reverse osmosis etc.
Wherein, reverse osmosis is to utilize the membrane sepn filtering technique of pressure difference for power, come from the research of U.S.'s nineteen sixties aerospace science and technology, after gradate to civilian, extensively apply to fields such as scientific research, medicine, food, beverage, sea water desaltination at present.The reverse osmosis membrane aperture is little of nano level, under certain pressure, water molecules can pass through reverse osmosis membrane, and impurity such as the inorganic salt in the water of source, heavy metal ion, organism, colloid, bacterium, virus can't pass through reverse osmosis membrane, thereby pure water that can see through and the condensed water strictness that can't see through are made a distinction.
Boiler recirculated water desalinating process flow process of the prior art, as shown in Figure 1:
Former water is removed the tiny grains of sand, suspended substance, planktonic organism and jelly etc. through more medium filter; Removing the suspended substance of particle diameter more than 100 μ m in the water by disc filter again, is the pretreating device of ultrafiltration system, to ensure the normal operation of ultrafiltration system; Ultrafiltration has higher filtering accuracy, can guarantee water outlet SDI value<2, is the pretreatment unit of reverse osmosis system, prolongs the cleaning interval and the work-ing life of reverse osmosis membrane, improves the reverse osmosis membrane water production rate; Security personnel's strainer plays the effect of further protection reverse osmosis membrane, removes by filter diameter in the water greater than impurity such as any particle of 5 μ m, suspended substance, colloids; Reverse osmosis system is the desalination main body section, and its principle is that former water passes through reverse osmosis membrane under the effect of high pressure, thereby the solvent in the water reaches separation, purification, spissated purpose by high density to the lower concentration diffusion.
There is following shortcoming at least in above-mentioned prior art:
The shortcoming of prior art is that its product water rate of recovery is low, concentrated water discharge concentration is low, cleaning frequency membrane is high.
The utility model content
The purpose of this utility model provides a kind of water rate of recovery height, concentrated water discharge concentration height, high-recovery reverse osmosis membrane water treatment system that cleaning frequency membrane is low of producing.
The purpose of this utility model is achieved through the following technical solutions:
High-recovery reverse osmosis membrane water treatment system of the present utility model comprises pretreatment unit, reverse osmosis unit, and described pretreatment unit comprises disc filter, Na-ion exchanger;
Described reverse osmosis unit comprises one section reverse osmosis membrane assembly, two sections reverse osmosis membrane assemblies;
Former water enters described one section reverse osmosis membrane assembly through described disc filter, Na-ion exchanger successively;
The dense water that described one section reverse osmosis membrane assembly comes out enters described two sections reverse osmosis membrane assemblies.
The technical scheme that provides by above-mentioned the utility model as can be seen, high-recovery reverse osmosis membrane water treatment system described in the utility model owing to comprise pretreatment unit, reverse osmosis unit, pretreatment unit comprises disc filter, Na-ion exchanger; Reverse osmosis unit comprises one section reverse osmosis membrane assembly, two sections reverse osmosis membrane assemblies; Former water through disc filter filter, Na-ion exchanger softening after, entering two sections reverse osmosis membrane assemblies. it is low to produce water rate of recovery height, concentrated water discharge concentration height, cleaning frequency membrane.
Description of drawings
Fig. 1 is a boiler recirculated water desalinating process flow process in the prior art;
Fig. 2 is the process flow sheet of high-recovery reverse osmosis membrane water treatment system of the present utility model;
Fig. 3 is the structure principle chart of reverse osmosis unit part in the utility model.
Among the figure, the strainer of 1. ensuring public security; 2. high-pressure pump; 3. one section dense water-circulating pump; 4. two sections dense water-circulating pumps; 5. one section reverse osmosis membrane assembly; 6. two sections reverse osmosis membrane assemblies.
Embodiment
High-recovery reverse osmosis membrane water treatment system of the present utility model, its preferable embodiment comprises pretreatment unit, reverse osmosis unit as shown in Figure 2, pretreatment unit comprises disc filter, Na-ion exchanger.
Shown in Fig. 2,3, reverse osmosis unit can comprise one section reverse osmosis membrane assembly, two sections reverse osmosis membrane assemblies; Former water enters one section reverse osmosis membrane assembly through disc filter, Na-ion exchanger successively; The dense water that one section reverse osmosis membrane assembly comes out enters two sections reverse osmosis membrane assemblies.
Can be provided with ultrafiltration system between disc filter and the Na-ion exchanger.
Can be provided with security personnel's strainer between Na-ion exchanger and the reverse osmosis unit.
Can be provided with the pH value adjusting device between Na-ion exchanger and the security personnel's strainer.
One section above-mentioned reverse osmosis membrane assembly can comprise 3-5 group reverse osmosis membrane, as 4 groups; Two sections reverse osmosis membrane assemblies can comprise 1-3 group reverse osmosis membrane, as 2 groups.
The utility model can pass through preconditioning technique, removes suspended solids and part hardness in the water of source; Can change the operation condition of RO (reverse osmosis) by adjusting pH to suitable level; Reverse osmosis unit adopts dense water internal recycle two-part film system, realizes high-recovery with minority film spare.For the desalination reverse osmosis unit provides a cover high-recovery film operation process technology, guarantee reverse osmosis membrane non-scaling under high-recovery, do not influence the work-ing life of film simultaneously, this technology makes the reverse osmosis produced water rate of recovery bring up to 90% by 75% of traditional technology.
Below each parts in the utility model are described in detail:
Disc filter: disc filter is that elementary unit groups becomes combined filter by 3 inches filtering head, and its filtering element is made of the polypropylene plastics charging tray of one group of with groove, and the filtering accuracy of filtering table is 100um, can satisfy ultrafiltration water inlet requirement.
Ultrafiltration system: ultra-filtration process is the screening process relevant with membrane pore size, colloid in the removal water and small suspended substance etc.Water SDI<2 after the processing, turbidity<0.05NTU reaches the feed water by reverse osmosis water quality requirement.
Na-ion exchanger: the sodium ion exchange is a softening process, in cation exchange reaction, with the process that calcium, magnesium ion (hardness components) in the water are removed, reacts as follows.
Figure G2009201092734D00031
Reverse osmosis unit: adopt dense water internal recycle two-part film system, this system can accomplish to realize high-recovery with a small amount of film spare, the water inlet flow velocity can be kept constant in the membrane module, be not subjected to the variation that leading portion membrane module pollution level or water inlet form and change, simultaneously, have detergent line simple, remedy pollute easily, film import and export between advantage such as pressure unanimity.In this reverse osmosis unit, major part enters next stage by regulating the flow of water circulating pump, can only allow the concentrate recirculation circulation of leaving this section small portion, can obtain system's optimum operation effect like this.
Feed water by reverse osmosis is regulated the pH value: realize the high-recovery of reverse osmosis unit, another main points are that reverse osmosis process is carried out under high pH condition, but the pH value of dense water must not surpass 11.0.In the pre-treatment through lime the water after softening, its pH value will be about 10.0, thus in feed water by reverse osmosis, do not add or slightly small amounts of sodium hydroxide solution just can guarantee the pH value that is fit to.Pollution-free, the no fouling of reverse osmosis membrane under the high pH condition this means that the flux of film can be very high, has both produced water rate of recovery height.
Reverse osmosis unit moves under high pH condition and has the following advantages:
1) anti-Organic pollutants are strong: under high pH condition, and the fatty acid saponification in the water---form as material as the soap and help to clean the film surface; Under high pH condition, organism is dissolved in the water, and non-cohesive on film.So the operation of reverse osmosis unit under high pH condition is equivalent to carrying out the cleaning of dilute solution always.
2) stable against biological contamination is strong: under the condition of high pH, most of biologies do not have destroyed biology to breed owing to change in concentration huge between water inlet and the dense water goes to pot by " dissolving ".
3) particle-resistant/colloid pollution is strong: the zeta current potential of film becomes very strong negative electricity, and most of natural particle is electronegative simultaneously, and negative electricity repels each other, so particle is difficult to be attached to the film surface.
4) hydraulics of dense aquaporin changes under high pH condition, the laminar boundary layer attenuation on film surface.So particle places the turbosphere on film surface and is flushed away.
5) pollution of no silicon and high clearance is arranged: the solubleness of silicon rises rapidly under high pH condition, and solubleness>2000mg/l pollutes and produces so do not have silicon.
6) pollution of no difficulty soluble salt: the utility model is at first removed hardness to low-down level, so move under high pH condition, resin is not only removed all hardness, goes back the polyvalent cation in the exchanged water, as caesium, barium, aluminium, iron etc., thus the film fouling of avoiding these ions to cause.
Adopt " disc filter+Na-ion exchanger " pretreatment technology in the utility model, replaced traditional " more medium filter+disc filter " technology; Adopt the sodium ion exchange process to remove the hardness in the water, provide precondition for realizing high-recovery reverse osmosis operation; Reverse osmosis membrane moves under high pH condition, prevents that effectively film from polluting, and has reduced the film wash number, has improved the product water rate of recovery greatly, simultaneously, does not influence the work-ing life of film; Reverse osmosis unit adopts dense water internal recycle two-part film system, realizes high-recovery with less film spare.Have integrated and level of automation high, characteristics such as maintenance operation facility.
The above; it only is the preferable embodiment of the utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed within the protection domain of the present utility model.

Claims (6)

1. a high-recovery reverse osmosis membrane water treatment system is characterized in that, comprise pretreatment unit, reverse osmosis unit, described pretreatment unit comprises disc filter, Na-ion exchanger;
Described reverse osmosis unit comprises one section reverse osmosis membrane assembly, two sections reverse osmosis membrane assemblies;
Former water enters described one section reverse osmosis membrane assembly through described disc filter, Na-ion exchanger successively;
The dense water that described one section reverse osmosis membrane assembly comes out enters described two sections reverse osmosis membrane assemblies.
2. high-recovery reverse osmosis membrane water treatment system according to claim 1 is characterized in that, is provided with ultrafiltration system between described disc filter and the Na-ion exchanger.
3. high-recovery reverse osmosis membrane water treatment system according to claim 2 is characterized in that, is provided with security personnel's strainer between described Na-ion exchanger and the described reverse osmosis unit.
4. high-recovery reverse osmosis membrane water treatment system according to claim 3 is characterized in that, is provided with the pH value adjusting device between described Na-ion exchanger and the described security personnel's strainer.
5. high-recovery reverse osmosis membrane water treatment system according to claim 4 is characterized in that, described one section reverse osmosis membrane assembly comprises 3-5 group reverse osmosis membrane; Described two sections reverse osmosis membrane assemblies comprise 1-3 group reverse osmosis membrane.
6. high-recovery reverse osmosis membrane water treatment system according to claim 5 is characterized in that, described one section reverse osmosis membrane assembly comprises 4 groups of reverse osmosis membranes; Described two sections reverse osmosis membrane assemblies comprise 2 groups of reverse osmosis membranes.
CN2009201092734U 2009-06-15 2009-06-15 Reverse-osmosis film water treatment system with high recycling rate Expired - Fee Related CN201458865U (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101935117A (en) * 2010-07-28 2011-01-05 河南中鹤纯净粉业有限公司 Novel technique for moistening wheat for making wheat flour with purified water
CN102276085A (en) * 2011-07-19 2011-12-14 河北省电力建设调整试验所 Recycling treatment method for discharge water of circulating water from power plant
CN102285736A (en) * 2011-06-17 2011-12-21 河北省电力建设调整试验所 Reverse osmosis pre-treatment method for recycling reclaimed water in electric power plant
CN103539288A (en) * 2013-10-31 2014-01-29 神华集团有限责任公司 Industrial wastewater recovery method and wastewater recovery system
CN104108813A (en) * 2014-07-17 2014-10-22 中国石油天然气股份有限公司 Refining sewage desalination integrated treatment process and device
CN107151042A (en) * 2016-03-02 2017-09-12 上海丰信环保科技有限公司 Anti-pollution reverse-osmosis system
CN107935215A (en) * 2017-11-22 2018-04-20 南方创业(天津)科技发展有限公司 It is a kind of to be suitable for bitter and the recoverable purifier of sea water desalination pressure at the same time
CN113518657A (en) * 2019-03-22 2021-10-19 株式会社Lg化学 High recovery reverse osmosis spacer and element

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101935117A (en) * 2010-07-28 2011-01-05 河南中鹤纯净粉业有限公司 Novel technique for moistening wheat for making wheat flour with purified water
CN102285736A (en) * 2011-06-17 2011-12-21 河北省电力建设调整试验所 Reverse osmosis pre-treatment method for recycling reclaimed water in electric power plant
CN102276085A (en) * 2011-07-19 2011-12-14 河北省电力建设调整试验所 Recycling treatment method for discharge water of circulating water from power plant
CN102276085B (en) * 2011-07-19 2013-02-13 河北省电力建设调整试验所 Recycling treatment method for discharge water of circulating water from power plant
CN103539288A (en) * 2013-10-31 2014-01-29 神华集团有限责任公司 Industrial wastewater recovery method and wastewater recovery system
CN104108813A (en) * 2014-07-17 2014-10-22 中国石油天然气股份有限公司 Refining sewage desalination integrated treatment process and device
CN104108813B (en) * 2014-07-17 2016-06-08 中国石油天然气股份有限公司 Refining sewage desalination integrated treatment process and device
CN107151042A (en) * 2016-03-02 2017-09-12 上海丰信环保科技有限公司 Anti-pollution reverse-osmosis system
CN107935215A (en) * 2017-11-22 2018-04-20 南方创业(天津)科技发展有限公司 It is a kind of to be suitable for bitter and the recoverable purifier of sea water desalination pressure at the same time
CN113518657A (en) * 2019-03-22 2021-10-19 株式会社Lg化学 High recovery reverse osmosis spacer and element

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20100512

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