CN102838228A - Membrane seawater desalination pretreatment system - Google Patents
Membrane seawater desalination pretreatment system Download PDFInfo
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- CN102838228A CN102838228A CN2012102909734A CN201210290973A CN102838228A CN 102838228 A CN102838228 A CN 102838228A CN 2012102909734 A CN2012102909734 A CN 2012102909734A CN 201210290973 A CN201210290973 A CN 201210290973A CN 102838228 A CN102838228 A CN 102838228A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Abstract
The invention relates to the field of seawater desalination, in particular to a membrane seawater desalination pretreatment system. The invention mainly solves the technical problems that in the prior art, the water quality of effluent subjected to seawater desalination pretreatment is poor, the dirt blockage of a membrane treatment system can be accelerated after a device in the prior art operates for a long time, the operation is complex, a pretreatment dosing system needs to be linked with the water quality and a flocculating agent generates the post-flocculation phenomenon in the membrane treatment system to cause the results that inorganic salt deposit is generated by a membrane in short time, the service life is influenced and the like. A method disclosed by the invention comprises the following steps of: seawater boosting, water supply and medicine addition, flocculation reaction, inclined plate precipitation, tail-end filtration, filter backwashing and sludge discharge. A crossed panel separator reactor is arranged in a mesh flocculation reaction tank.
Description
Technical field
The present invention relates to a kind of sea water desaltination field, especially relate to a kind of embrane method sea water desaltination pretreatment system.
Background technology
Along with the fast development of sea water desaltination industry, the reverse osmosis membrane desalination technology is with its lower operation energy consumption, effluent quality reliably, and advantages such as full-automatic operation have obtained application widely in China coastal cities.Reverse osmosis system is as the core component of sea water desalinization, and to having relatively high expectations of influent quality, the treatment effect of sea water preprocessing system will play very crucial effect to the success or failure of reverse osmosis membrane seawater desalination system.
Conventional at present sea water preprocessing generally adopts the flocculation reaction deposition pool process.Yet seawater quality is not only bigger with seasonal fluctuation; Also receive the every day of the influence of twice morning and evening tides sooner or later simultaneously; Turbidity of sea water usually can fluctuation in a big way in, the reaction settling basin effluent quality can't the zone of reasonableness of long-term stability in, increased the operating load of subsequent film treatment system; Make cleaning frequency membrane increase, shorten work-ing life.
Therefore, in order to guarantee the steady running of subsequent film treatment system, need be optimized design to pre-treatment.Chinese patent discloses a kind of sea water desaltination pretreatment process and equipment, and (publication number: CN101215061), its pretreatment process adopts ozone-ultraviolet concurrent disinfection, enhanced coagulation and precipitates and integrated seawater carried out pre-treatment.Chinese patent also disclose the pretreated process method of a kind of industriallization sea water desaltination (publication number: CN101164908) "; its seawater with the natural subsidence pond promotes through lift pump; in ejector with mixes the back from the flocculation agent jar through the flocculation agent of volume pump metering and gets into three grades of mechanical stirring flocculation reaction inclined-plate clarifying basins; sterilant is directly squeezed into machinery through the volume pump metering and is mixed the pond; after mixing, flocculating, overflow is to inclined-plate clarifying basin, and the overflow of inclined-plate clarifying basin supernatant is to the purifying sea water storage tank.Mainly there is following problem in existing treatment process: effluent quality is relatively poor: common reaction settling basin is handled seawater; Delivery turbidity is usually about 20NTU; Under the situation of seawater quality fluctuation, turbidity possibly be elevated to 50NTU, and the long-time running meeting is accelerated the dirt of film processing system and blocked up; Operation is complicated: seawater quality is all fluctuating every day in a big way, and the pre-treatment medicine system need link with water quality.Because reaction settling basin reaction and the influence of the residence time, the adjusting of dosing always lags behind the conversion of water quality, and the system operation of making is comparatively complicated; Back flocculation phenomenon takes place: for guaranteeing the pre-treatment effluent quality, flocculation phenomenon in back takes place in the excessive flocculation agent that adds in reaction settling basin, unreacted flocculation agent completely in film processing system, cause film to produce inorganic salt crust at short notice, influences work-ing life.
Summary of the invention
The present invention provides a kind of embrane method sea water desaltination pretreatment system; It mainly is that the pretreated effluent quality of solution existing in prior technology sea water desaltination is relatively poor, and the long-time running meeting is accelerated the dirt of film processing system and blocked up the operation complicacy; The pre-treatment medicine system need link with water quality; And flocculation phenomenon in back takes place in flocculation agent in film processing system, cause film to produce inorganic salt crust at short notice, influences the technical problem in work-ing life etc.
Above-mentioned technical problem of the present invention mainly is able to solve through following technical proposals:
A kind of embrane method sea water desaltination pretreatment system of the present invention is characterized in that described system comprises:
A. seawater boosts: be stored in the seawater in the former pond of seawater, through sea water booster pump, be transported to the grid flocculation reaction tank;
B. the dosing of feeding water: on the inlet channel static line mixer is set before the reaction tank,, adds flocculation agent and sterilant through the dosing volume pump;
C. flocculation reaction: seawater carries out flocculation reaction in grid flocculation, generates alumen ustum;
D. sloping plate deposition: through the ripple inclined-plate clarifying basin, alumen ustum is through gravity settling, and water outlet flows automatically to the V-type filter tank;
E. terminal the filtration: the seawater gravity flow further reduces delivery turbidity and suspended substance through the V-type filter tank, produces water from flowing into the seawater clean water basin;
F. filter tank backwash: combined water and air backwash is regularly carried out in the V-type filter tank after operation for some time, guarantee effluent quality;
G. mud discharging: the regular spoil disposal of ripple inclined-plate clarifying basin and V-type filter tank, muddy water gets into the sludge sump subsequent disposal.
V-type filter tank treatment process is set behind the ripple inclined-plate clarifying basin; Homogeneous filtering material through the V-type filter tank; Further reduce delivery turbidity and suspended substance, whole sea water preprocessing system delivery turbidity is reached below the 5NTU, be far superior to the influent quality requirement of subsequent film treatment system.
For preventing sea-water corrosion, the pre-treatment principal facility all adopts the ground type skeleton construction, and the semi-underground type skeleton construction is adopted in the pond, and rotproofing is done in inside.Equipment in the reaction settling basin all adopts corrosion resistant materials such as glass reinforced plastic or PE like grid reaction device, swash plate etc.
As preferably, described grid flocculation reaction tank and ripple inclined-plate clarifying basin adopt concrete structures, and the pond body is built jointly, save floor space.
As preferably, be provided with cross fin piece partition plate reactor drum in the described grid flocculation reaction tank, cross fin piece partition plate reactor drum comprises many PE pipes, is fixed with criss-cross PE fin on the PE pipe, the PE fin on all PE pipes is formed grid type.Cross fin piece partition plate reactor drum can be strengthened the waterpower mixing effect, strengthens the alumen ustum cohesion, makes flocculation reaction more abundant.
As preferably, be provided with closely spaced ripple swash plate in the described ripple inclined-plate clarifying basin.Alumen ustum deposition distance is obviously reduced, flow resistance is increased, flow distribution is even in the settling tank, improves settling condition, improves sedimentation effect.
As preferably, add flocculation agent and sterilant in the described static line mixer, flocculation agent is an iron trichloride, sterilant is a Youxiaolin.
As preferably, the filtrate in the described V-type filter tank is an individual layer homogeneous quartz sand filter media.
As preferably, the flocculation time 10-14min of described former water in the grid flocculation reaction tank, the ripple inclined-plate clarifying basin residence time is 20-40min, upflow velocity is 2.0-2.5mm/s, surface load 8-9m
3/ m
2/ h.
Therefore, the present invention improves the treatment effect and the shock-resistant ability of reaction settling basin through cross grid reaction device and little spacing ripple swash plate are set; Can better adapt to the fluctuation of seawater quality, simplify operation, the V-type filter tank is set behind reaction settling basin; Make and do not precipitate completely that alumen ustum obtains filtration treatment; Effectively reduce the risk of back flocculation, prolonged more than ultra-filtration membrane cleaning interval to 3 month, reduced operation and maintenance cost; Improve effluent quality, turbidity is dropped to below the 5NUT by common 20NUT, satisfied the influent quality requirement of embrane method seawater desalination system fully, can realize the long-term stability operation of seawater desalination system.
Description of drawings
Accompanying drawing 1 is a kind of structural representation of the present invention;
Accompanying drawing 2 is a kind of structural representations of cross fin piece partition plate reactor drum of the present invention.
Component, position and numbering among the figure: the former pond of seawater 1, sea water booster pump 2, grid flocculation reaction tank 3, static line mixer 4, ripple inclined-plate clarifying basin 5, V-type filter tank 6, seawater clean water basin 7, PE pipe 8, PE fin 9, ripple swash plate 10.
Embodiment
Pass through embodiment below, and combine accompanying drawing, do further bright specifically technical scheme of the present invention.
Embodiment 1: in the six Heng Dao marine site projects of Zhoushan, use this technology.Surrounding waters, factory site salinity mainly receives weather effect, the about 27000～31000mg/L of seawater saltiness.Surrounding waters, factory site sediment source be mainly the Changjiang river come husky, winter sediment concentration greater than summer, according to relevant hydrometry data, surrounding waters, factory site mean lower low water spring sediment concentration is 0.217kg/m
3, ebb tide actual measurement sediment concentration is 0.554kg/m
3～0.079kg/m
3, after maximum sediment concentration generally appears at the rise urgency or the urgency that falls in the tide cycle.
A kind of embrane method sea water desaltination pretreatment system of this example, like Fig. 1, its treatment step is:
A. seawater boosts: be stored in the seawater in the former pond 1 of seawater, through sea water booster pump 2, be transported to grid flocculation reaction tank 3;
B. the dosing of feeding water: on the inlet channel static line mixer 4 is set before the reaction tank, through the dosing volume pump, adds flocculation agent and sterilant, wherein flocculation agent is an iron trichloride, and sterilant is a Youxiaolin;
C. flocculation reaction: seawater carries out flocculation reaction in grid flocculation; Generate alumen ustum, be provided with cross fin piece partition plate reactor drum in the grid flocculation reaction tank, like Fig. 2; Cross fin piece partition plate reactor drum comprises many PE pipes 8; Be fixed with criss-cross PE fin 9 on the PE pipe, the PE fin on all PE pipes is formed grid type, the flocculation time 12min of the former water after the dosing in the grid flocculation reaction tank;
D. sloping plate deposition: through ripple inclined-plate clarifying basin 5, alumen ustum is through gravity settling, and water outlet flows automatically to V-type filter tank 6, the residence time 35min of ripple inclined-plate clarifying basin wherein, upflow velocity 2.2mm/s, surface load 7.9m
3/ m
2/ h;
E. terminal the filtration: the seawater gravity flow is through V-type filter tank 6, and V-type filter tank design filtering velocity is 8.3m/h, adopts individual layer homogeneous quartz sand filter media; Thickness is 1.2m; Effective size of grain is 0.90-1.20mm, further reduces delivery turbidity and suspended substance, produces water from flowing into seawater clean water basin 7;
F. filter tank backwash: combined water and air backwash is regularly carried out in V-type filter tank 6 after operation for some time, guarantee effluent quality;
G. mud discharging: ripple inclined-plate clarifying basin 5 and V-type filter tank 6 regular spoil disposals, muddy water entering sludge sump subsequent disposal.
Adopt HACH 2100N turbidimeter, water quality situation after detection system puts into operation.The reaction settling basin delivery turbidity is generally 18NUT, and V-type filter tank delivery turbidity is less than 5NTU.
Embodiment 2: the about 28000～32000mg/L of surrounding waters, factory site, Xiangshan, Ningbo seawater saltiness, surrounding waters mean lower low water spring sediment concentration is 0.242kg/m
3, ebb tide actual measurement sediment concentration is 0.563kg/m
3～0.08k2g/m
3, after maximum sediment concentration generally appears at the rise urgency or the urgency that falls in the tide cycle.
A kind of embrane method sea water desaltination pretreatment system of this example, like Fig. 1, its treatment step is:
A. seawater boosts: be stored in the seawater in the former pond 1 of seawater, through sea water booster pump 2, be transported to grid flocculation reaction tank 3;
B. the dosing of feeding water: on the inlet channel static line mixer 4 is set before the reaction tank, through the dosing volume pump, adds flocculation agent and sterilant, wherein flocculation agent is an iron trichloride, and sterilant is a Youxiaolin;
C. flocculation reaction: seawater carries out flocculation reaction in grid flocculation, generates alumen ustum, like Fig. 2; Be provided with cross fin piece partition plate reactor drum in the grid flocculation reaction tank; Like Fig. 2, cross fin piece partition plate reactor drum comprises many PE pipes 8, is fixed with criss-cross PE fin 9 on the PE pipe; PE fin on all PE pipes is formed grid type, the flocculation time 12min of the former water after the dosing in the grid flocculation reaction tank;
D. sloping plate deposition: through ripple inclined-plate clarifying basin 5, alumen ustum is through gravity settling, and water outlet flows automatically to V-type filter tank 6, the residence time 30min of ripple inclined-plate clarifying basin wherein, upflow velocity 2.2mm/s, surface load 8.0m3/m2/h;
E. terminal the filtration: the seawater gravity flow is through V-type filter tank 6, and V-type filter tank design filtering velocity is 8.3m/h, adopts individual layer homogeneous quartz sand filter media; Thickness is 1.2m; Effective size of grain is 0.90-1.20mm, further reduces delivery turbidity and suspended substance, produces water from flowing into seawater clean water basin 7;
F. filter tank backwash: combined water and air backwash is regularly carried out in V-type filter tank 6 after operation for some time, guarantee effluent quality;
G. mud discharging: ripple inclined-plate clarifying basin 5 and V-type filter tank 6 regular spoil disposals, muddy water entering sludge sump subsequent disposal.
Adopt HACH 2100N turbidimeter, water quality situation after detection system puts into operation.The reaction settling basin delivery turbidity is generally 20NUT, and V-type filter tank delivery turbidity is less than 5NTU.
Comparative Examples: the Leqing Bay sea water salinity receives the influence of Zhejiang coastal stream and Taiwan Warm Current, and it is low to show as Xia Gaodong.According to the bank door ocean station data of gulf mouth, maximum salinity 34.4 ‰ appears at summer; Minimum 20.34 ‰, appear at winter.The turbidity of power plant surrounding waters changes also quite greatly, can within one hour, change to thousands of (NTU) by tens, causes that wherein the essential substance that turbidity changes is the silty clay that suspends.
Seawater gets into former pond through circulating pipe; Behind boosting pump, get into reaction settling basin; Add flocculation agent and sterilant through static line mixer before intaking, planning grid flocculation tank flocculation time 12min, inclined-plate clarifying basin residence time 30min; Upflow velocity 2.3mm/s, surface load 8.2m3/m2/h.The plastic grid reactor drum is set in the grid flocculation reaction tank, conventional plastics swash plate is set in the ripple inclined-plate clarifying basin.
Adopt HACH 2100N turbidimeter, water quality situation after detection system puts into operation.Usually about 20NUT, under the situation of seawater quality fluctuation, effluent quality worsens the reaction settling basin delivery turbidity to some extent.
The above is merely specific embodiment of the present invention, but constitutional features of the present invention is not limited thereto, and any those skilled in the art is in the field of the invention, and the variation of being done or modify all is encompassed among the claim of the present invention.
Claims (8)
1. embrane method sea water desaltination pretreatment system is characterized in that described system comprises:
A. seawater boosts: be stored in the seawater in the former pond of seawater (1), through sea water booster pump (2), be transported to grid flocculation reaction tank (3);
B. the dosing of feeding water: on the inlet channel static line mixer (4) is set before the reaction tank,, adds flocculation agent and sterilant through the dosing volume pump;
C. flocculation reaction: seawater carries out flocculation reaction in grid flocculation, generates alumen ustum;
D. sloping plate deposition: through ripple inclined-plate clarifying basin (5), alumen ustum is through gravity settling, and water outlet flows automatically to V-type filter tank (6);
E. terminal the filtration: the seawater gravity flow further reduces delivery turbidity and suspended substance through V-type filter tank (6), produces water from flowing into seawater clean water basin (7);
F. filter tank backwash: combined water and air backwash is regularly carried out in V-type filter tank (6) after operation for some time, guarantee effluent quality;
G. mud discharging: ripple inclined-plate clarifying basin (5) and V-type filter tank (6) are spoil disposal regularly, and muddy water gets into the sludge sump subsequent disposal.
2. a kind of embrane method sea water desaltination pretreatment system according to claim 1 is characterized in that described grid flocculation reaction tank (3) and ripple inclined-plate clarifying basin (5) adopt concrete structures.
3. a kind of embrane method sea water desaltination pretreatment system according to claim 1; It is characterized in that being provided with in the described grid flocculation reaction tank (3) cross fin piece partition plate reactor drum; Cross fin piece partition plate reactor drum comprises many PE pipes (8); Be fixed with criss-cross PE fin (9) on the PE pipe, the PE fin on all PE pipes is formed grid type.
4. a kind of embrane method sea water desaltination pretreatment system according to claim 1 is characterized in that being provided with in the described ripple inclined-plate clarifying basin (5) closely spaced ripple swash plate (10).
5. a kind of embrane method sea water desaltination pretreatment system according to claim 1 is characterized in that adding flocculation agent and sterilant in the described static line mixer (4), and flocculation agent is an iron trichloride, and sterilant is a Youxiaolin.
6. a kind of embrane method sea water desaltination pretreatment system according to claim 1 is characterized in that the filtrate in the described V-type filter tank (6) is an individual layer homogeneous quartz sand filter media.
7. a kind of embrane method sea water desaltination pretreatment system according to claim 1; It is characterized in that the flocculation time 10-14min of former water in grid flocculation reaction tank (3) after the described dosing; Ripple inclined-plate clarifying basin (5) residence time is 20-40min; Upflow velocity is 2.0-2.5mm/s, surface load 8-9m
3/ m
2/ h.
8. a kind of embrane method sea water desaltination pretreatment system according to claim 1 is characterized in that described V-type filter tank (6) adopts regular backwash, and backwash process is that gas dashes, air water recoils simultaneously, water dashes three steps.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104692557A (en) * | 2014-12-22 | 2015-06-10 | 内蒙古久科康瑞环保科技有限公司 | Chemical pretreatment method and device thereof for treating high-salinity wastewater |
| CN105565405A (en) * | 2016-02-26 | 2016-05-11 | 徐州工程学院 | Vertical type rapid water purifying device and water purifying method thereof |
| CN106082505A (en) * | 2016-08-19 | 2016-11-09 | 北京今大禹环境技术股份有限公司 | The seawater desalinization pretreatment system that a kind of sea water is divided and ruled |
| CN108928968A (en) * | 2018-08-17 | 2018-12-04 | 卢响锋 | A kind of multifunctional seawater desalting salt analysis apparatus |
| CN111217474A (en) * | 2019-11-25 | 2020-06-02 | 天津大学 | Coagulation membrane filtration process optimization method aiming at 'post-flocculation' phenomenon |
| CN111302527A (en) * | 2020-02-21 | 2020-06-19 | 宁夏水投环保发展有限公司 | Novel corridor type treatment process and operation method for coal gasification fluorine-containing wastewater |
| CN112520903A (en) * | 2020-12-18 | 2021-03-19 | 哈尔滨工业大学水资源国家工程研究中心有限公司 | Seawater desalination pretreatment system and use method thereof |
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| CN2470347Y (en) * | 2001-03-19 | 2002-01-09 | 中国人民解放军后勤工程学院 | Sea water desalting apparatus |
| CN1673100A (en) * | 2005-03-25 | 2005-09-28 | 池万清 | Pre-treating method and apparatus for desalting sea water |
| CN101164908A (en) * | 2007-10-11 | 2008-04-23 | 马敬环 | Industrialized Technique for sea water desalination and pretreatment |
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| CN2470347Y (en) * | 2001-03-19 | 2002-01-09 | 中国人民解放军后勤工程学院 | Sea water desalting apparatus |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104692557A (en) * | 2014-12-22 | 2015-06-10 | 内蒙古久科康瑞环保科技有限公司 | Chemical pretreatment method and device thereof for treating high-salinity wastewater |
| CN105565405A (en) * | 2016-02-26 | 2016-05-11 | 徐州工程学院 | Vertical type rapid water purifying device and water purifying method thereof |
| CN105565405B (en) * | 2016-02-26 | 2018-01-19 | 徐州工程学院 | A kind of vertical Quick purifying device and its process for purifying water |
| CN106082505A (en) * | 2016-08-19 | 2016-11-09 | 北京今大禹环境技术股份有限公司 | The seawater desalinization pretreatment system that a kind of sea water is divided and ruled |
| CN108928968A (en) * | 2018-08-17 | 2018-12-04 | 卢响锋 | A kind of multifunctional seawater desalting salt analysis apparatus |
| CN111217474A (en) * | 2019-11-25 | 2020-06-02 | 天津大学 | Coagulation membrane filtration process optimization method aiming at 'post-flocculation' phenomenon |
| CN111302527A (en) * | 2020-02-21 | 2020-06-19 | 宁夏水投环保发展有限公司 | Novel corridor type treatment process and operation method for coal gasification fluorine-containing wastewater |
| CN112520903A (en) * | 2020-12-18 | 2021-03-19 | 哈尔滨工业大学水资源国家工程研究中心有限公司 | Seawater desalination pretreatment system and use method thereof |
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Effective date of registration: 20200925 Address after: No.99, Huaxing Road, Xihu District, Hangzhou City, Zhejiang Province Patentee after: Zhejiang Tiandi Environmental Protection Technology Co., Ltd Address before: 311203, 19 floor, building 1, Pacific Plaza, No. 451 Jincheng Road, Xiaoshan District, Zhejiang, Hangzhou Patentee before: ZHEJIANG DONGFA ENVIRONMENTAL PROTECTION ENGINEERING Co.,Ltd. |
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