CN1583605A - Treating method and apparatus for seawater desalting - Google Patents
Treating method and apparatus for seawater desalting Download PDFInfo
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- CN1583605A CN1583605A CNA200410025329XA CN200410025329A CN1583605A CN 1583605 A CN1583605 A CN 1583605A CN A200410025329X A CNA200410025329X A CN A200410025329XA CN 200410025329 A CN200410025329 A CN 200410025329A CN 1583605 A CN1583605 A CN 1583605A
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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
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Abstract
It can improve the water recover rate efficiently after desalting the seawater, and made the equipment simple, save the energy and prevent the sediment on the face of membrane. The key technical scheme: first, the pretreatment seawater is desalted in the reverse osmosis instrument then go into the nanofiltration instrument directly at the high pressure. Last the wastewater return to the reverse osmosis instrument, So it begain a new cycle. The invention can be used to provide fresh water for island, tour region, sea oil flat roof. The equipment also can be loaded in the transporation such as truck, ship and so on.
Description
Technical field
The present invention relates to a kind of treatment process and equipment of water, refer in particular to reverse osmosis and nanofiltration bonded process for desalinating seawater and the equipment of utilizing.
Background technology
Because seawater saltiness height, hardness is big, and the turbidity change is big, is suspended with unequigranular organic and inorganic particles simultaneously, the microorganism of differing in size in addition, and also seawater itself has very high osmotic pressure, thereby sea water desaltination is quite complicated process.The principal element that influences the raising of the sea water desaltination product water rate of recovery is that penetration of sea water is pressed, in seawater reverse osmosis desalination process thoroughly, fresh water is constantly discharged, and the increase of seawater salt concn causes rising rapidly and the precipitation of separating out that becomes dirty component of osmotic pressure, and the desalination process is ended.Present known embrane method desalination process is: pre-treatment, reverse osmosis membrane processing make the technology of desalination water, and " reverse osmosis seawater desalting machine " arranged, Chinese patent application number: 97209034.7, and Granted publication number: CN2292794Y; " preparation method of sea water desalting membrane ", Chinese application number: 98122164.X, Granted publication number: CN1241535A; And journal title " Desalination ﹠amp; Water reuse " Vol8, " the A NewApproach to Membrane ﹠amp among No1, the No2; Thermal Seawater Desalination Processes UsingNanofiltration Membranes " in the desalination process that adopted be: pre-treatment, nanofiltration processing, reverse-osmosis treated are carried out successively.The product water rate of recovery of above-mentioned two kinds of seepage-resisting sea-water desalting process low (generally between 30～40%), pre-processing device is huge, complex treatment process, energy consumption is big, sea water desaltination cost height.
In traditional technology,, must research and develop the ability more reverse-osmosis membrane element and the high voltage bearing treatment unit of high pressure though can suitably improve the rate of recovery that water is produced in sea water desaltination by increasing working pressure in theory.There are not enough withstand voltage reverse osmosis membranes available in the market, moreover, pressurize, energy consumption also will increase substantially.Proposition of the present invention is intended to solve, under the situation of original working pressure, the reverse osmosis membrane generally selected for use in the market, improve the product water rate of recovery in the desalting process, treatment process, equipment are simplified as far as possible, reduced the sea water desaltination cost, save energy.
Summary of the invention
It is low to the objective of the invention is to solve the sea water desaltination product water rate of recovery of the prior art, and unit desalination product Water Energy consumption is big, reduces the direct investment expense of device and prevents reverse osmosis membrane surface scale sedimentation problem.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals: its ultimate principle is, at first is that seawater is carried out pre-treatment, and the requirement that seawater is reached enter reverse osmosis membrane is carried out desalination with seawater again in reverse osmosis membrane.Only the desalination product water rate of recovery through reverse osmosis membrane processing is lower, so need the condensed water of coming out from reverse osmosis membrane is utilized once more, condensed water is further handled in nanofiltration membrane, seen through the water-in that liquid returns reverse osmosis membrane after the processing, concentrated solution then emits.
The invention provides a kind of treatment process of sea water desaltination, this method flow carries out successively in the following order: pending seawater pumps into pretreater 3 through the supercharging pump housing 2 from raw water box 1, removes suspended substance, turbidity, particle, solids in the seawater; The clean sea water gravity flow of coming out through pretreater 3 enters intermediate water tank 5; Clean sea water in the intermediate water tank 5 pumps into counter-osmosis device 7 by the high pressure pump housing 6 again, after handling through counter-osmosis device 7, has removed most of ionic fresh water in the seawater, produces water as desalination and flows out; And condensed water gravity flow enters nanofiltration device 8 and handles; Through the water after 8 processing of nanofiltration device, the product water that contains most of monovalent ion and small part high valence ion flow back into the water inlet of the import of high-pressure pump body 6 as counter-osmosis device 7 certainly, and secondary concentration water falls as discharge of wastewater.
Pretreater 3 of the present invention is a kind of full filtration ultra-filtration equipment, and has cleaning system.The operation of pretreater 3 and washing unit adopt computer control, regularly, clean automatically.
The working pressure of counter-osmosis device 7 of the present invention is 5.0～7.0Mpa, and the working pressure of nanofiltration device 8 is 2.0～4.0Mpa.The working pressure of counter-osmosis device 7 is 6.5Mpa, the situation the best the when working pressure of nanofiltration device 8 is 3.5Mpa.
The invention provides a kind of treatment facility of sea water desaltination, comprise raw water box 1, the supercharging pump housing 2, ultra-filtration equipment 3, clean the pump housing 4, intermediate water tank 5, the high pressure pump housing 6, counter-osmosis device 7, nanofiltration device 8, it is characterized in that, the import of raw water box 1 is connected with seawater water intaking place, and the outlet of raw water box 1 is connected with 2 imports of the supercharging pump housing, and the outlet of the supercharging pump housing 2 is connected with the water-in of ultra-filtration equipment 3, the product water of ultra-filtration equipment 3 imports intermediate water tank 5 by outlet, the outlet of intermediate water tank 5 is connected with the import of the high pressure pump housing 6, and the water outlet of the high pressure pump housing 6 is connected with the water-in of counter-osmosis device 7, and the water outlet of counter-osmosis device 7 will be desalinated product water and be imported header tank, the dense water out of counter-osmosis device 7 is connected with the water-in of nanofiltration device 8, the condensed water outlet of nanofiltration device 8 bleeds off concentrated water drainage, and the desalination of nanofiltration device 8 is produced water out and is connected with the import of the high pressure pump housing 6, mixes the water inlet of back as counter-osmosis device 7 with the product water of ultra-filtration equipment 3; The import of cleaning the pump housing 4 is connected with an outlet of intermediate water tank 5, and the outlet of cleaning the pump housing 4 is connected with the product water out of ultra-filtration equipment 3, and the water-in of ultra-filtration equipment 3 uses as the cleaning sullage discharge outlet simultaneously.
The molecular weight cut-off of aforesaid device ultra-filtration equipment is 50000～200000 daltonian hollow fiber ultrafiltration membrane.When ultra-filtration equipment is molecular weight cut-off the best when being 100000 daltonian hollow fiber ultrafiltration membrane.The membrane element salt clearance of aforesaid device counter-osmosis device is greater than 99%, and the membrane element of nanofiltration device is 10～50% to the chlorion rejection, and divalent ion rejection such as sulfate radical are greater than 98%.
The invention has the beneficial effects as follows: make under the situation that does not improve working pressure, improved sea water desaltination greatly and produced the rate of recovery of water, and the investment of equipment is reduced, reduced the consumption of the energy, make sea water desaltination more economical.
Description of drawings
Fig. 1 is the sea water desalting equipment synoptic diagram in the specific embodiment of the invention 1.
Among Fig. 1, the 1st, raw water box, the 2nd, the supercharging pump housing, the 3rd, filter ultra-filtration equipment entirely, the 4th, clean the pump housing, the 5th, intermediate water tank, the 6th, the high pressure pump housing, the 7th, counter-osmosis device, the 8th, nanofiltration device, the 9,10,11,12,13,14,15, the 16th, valve.
Embodiment
Embodiment one,
With reference to accompanying drawing 1, sea water desaltination treatment facility of the present invention comprises raw water box 1, the supercharging pump housing 2, and ultra-filtration equipment 3 cleans the pump housing 4, intermediate water tank 5, the high pressure pump housing 6, counter-osmosis device 7, nanofiltration device 8 etc., they link to each other successively.The import of raw water box 1 is connected with seawater water intaking place, the outlet of raw water box 1 is connected with 2 imports of the supercharging pump housing, the outlet of the supercharging pump housing 2 is connected with the water-in of ultra-filtration equipment 3, the product water of ultra-filtration equipment 3 imports intermediate water tank 5 by outlet, the outlet of intermediate water tank 5 is connected with the import of the high pressure pump housing 6, the water outlet of the high pressure pump housing 6 is connected with the water-in of counter-osmosis device 7, the water outlet of counter-osmosis device 7 will be desalinated product water and be imported header tank, the dense water out of counter-osmosis device 7 is connected with the water-in of nanofiltration device 8, the condensed water outlet of nanofiltration device 8 bleeds off concentrated water drainage, the desalination of nanofiltration device 8 is produced water out and is connected with the import of the high pressure pump housing 6, mixes the water inlet of back as counter-osmosis device 7 with the product water of ultra-filtration equipment 3; The import of cleaning the pump housing 4 is connected with an outlet of intermediate water tank 5, and the outlet of cleaning the pump housing 4 is connected with the product water out of ultra-filtration equipment 3, and the water-in of ultra-filtration equipment 3 uses as the cleaning sullage discharge outlet simultaneously.
Embodiment two,
With reference to accompanying drawing 1, adopt the equipment of embodiment one, choose suitable concentration of seawater 28299mg/L, with seawater elder generation suction raw water box 1, when containing a certain amount of seawater in the raw water box 1, valve 9,11,14 is opened, valve 10,12,13 is closed.Start the supercharging pump housing 2, seawater is pumped in the full filtration ultra-filtration equipment 3 carry out pre-treatment.Through pretreated seawater, removed the suspended substance in the seawater, clay, mud, marine organisms, or the like material.Can effectively prevent like this in the seawater various suspended substances with become dirty component that reverse osmosis membrane is polluted, cause the decline or the damage of film properties.The full difference that filters ultrafiltration membrane treatment and cross flow filter treatment technology is, the full ultra-filtration membrane that filters does not have concentrated solution to discharge, whole water sees through film and converts product water to, and the things such as suspended solids in the seawater all are deposited in the ultra-filtration membrane surface, the relevant full journal title " Desalination " the 110th that is applied in that filters ultra-filtration membrane is rolled up, elaborate in the 107th ~ 114 page the article " Ultrafiltration (newtechnology), a viable cost-saving pretreatment for reverse osmosis andnanofiltration-A new approach to reduce costs ".For effectively removing above-mentioned various objectionable impuritiess in the seawater, select general requirement in 1～100 nanometer to the effective pore radius of ultra-filtration membrane, molecular weight cut-off is 50000 ~ 200000 dalton.Postrun pre-processing device film surface need regularly be cleaned because of having deposited a large amount of throw outs.During cleaning, earlier valve 10,12,13 is opened, valve 9,11,14 is closed.Open and clean the pump housing 4, make rinse water produce the water side vertically by the film reversed flow, directly impact being deposited on the lip-deep throw out of film, make the throw out loose or dislocation, and discharge, recover the performance of ultra-filtration membrane from water outlet 18 from film in the pressurization of the film back side.For improving operation efficiency, whole pretreater adopts the control of PCL computer.Generally speaking, ultra-filtration process operation 20 minutes, back flushing 1 minute, the about 1.5Kg/cm of the pressure of back flushing
2, flow 2.5m
3/ h.
When intermediate water tank 5 contained a certain amount of clean sea water by the time, valve 15,16 was opened, and starts the high pressure pump housing 6, carries out the high pressure desalination in counter-osmosis device 7.In order effectively to remove the salt in the seawater, when selecting reverse osmosis membrane, the salt clearance of general requirement membrane element is greater than 99%, just can reach the demand that water supply people daily life is produced in sea water desaltination like this.After operation for some time, slowly regulate high-pressure pump outlet valve and valve 15,16, the operating pressure that makes counter-osmosis device 7 is 5.0Mpa, and the operating pressure of nanofiltration device 8 is 2.0Mpa.Selection for nanofiltration membrane also has certain requirement, and nanofiltration membrane is to divalence (as: Ca
2+, SO
4 2-, CO
3 2-, Mg
2+Deng) etc. the high price ion have higher rejection, and to monovalent ion (as: Na
+, Cl
-Deng) then have higher transmittance relatively, therefore, through having removed most divalent ion in the product water after 8 processing of nanofiltration device, the just part monovalent ion of preserving.After such product water enters counter-osmosis device 7 again, can not increase the osmotic pressure of counter-osmosis device 7, therefore the working pressure of counter-osmosis device 7 can not increase yet, simultaneously because of having reduced Ca
2+, SO
4 2-, CO
3 2-, Mg
2+In the high price ion, thus effectively prevented appearance in reverse osmosis membrane surface scale sedimentation problem, and this moment seawater utilization ratio improve.So the requirement to membrane element is: to the chlorion rejection is 10～50%, and divalent ion rejection such as sulfate radical are greater than 98%, otherwise the desired purpose of inaccessible technological design.Because the dense water out of counter-osmosis device 7 is also being kept higher pressure,, only need just can obtain required flow and working pressure 2.0Mpa by regulated valve 15,16 so when entering nanofiltration device 8, do not need impressed pressure.
When the device operation enters just often, write down, test relevant service data.At this moment, the product water rate of recovery of device is 34.29%, salt clearance 98.36%.
Embodiment three,
With reference to accompanying drawing 1, adopt the identical method and apparatus of embodiment two, choose suitable concentration of seawater 28299mg/L, working pressure at counter-osmosis device 7 is 7.0Mpa, the working pressure of nanofiltration device 8 is 4.0Mpa, and the product water rate of recovery of this moment is 61.0%, salt clearance 98.96%.
Embodiment four,
With reference to accompanying drawing 1, adopt the identical method and apparatus of embodiment two, choose suitable concentration of seawater 28299mg/L, working pressure at counter-osmosis device 7 is 6.5Mpa, the working pressure of nanofiltration device 8 is 3.5Mpa, and the product water rate of recovery of this moment is 55.0%, salt clearance 98.55%.
Embodiment five,
With reference to accompanying drawing 1, adopt the identical method and apparatus of embodiment two, choose suitable concentration of seawater 36454mg/L, working pressure at counter-osmosis device 7 is 5.0Mpa, the working pressure of nanofiltration device 8 is 2.0Mpa, and the product water rate of recovery of this moment is 35.48%, salt clearance 98.25%.
Embodiment six,
With reference to accompanying drawing 1, adopt the identical method and apparatus of embodiment two, choose suitable concentration of seawater 36454mg/L, working pressure at counter-osmosis device 7 is 7.0Mpa, the working pressure of nanofiltration device 8 is 4.0Mpa, and the product water rate of recovery of this moment is 59.0%, salt clearance 98.72%.
Embodiment seven,
With reference to accompanying drawing 1, adopt the identical method and apparatus of embodiment two, choose suitable concentration of seawater 36454mg/L, working pressure at counter-osmosis device 7 is 6.5Mpa, the working pressure of nanofiltration device 8 is 3.5Mpa, and the product water rate of recovery of this moment is 54.3%, salt clearance 98.55%.
At last, it is also to be noted that what more than enumerate only is specific embodiments of the invention.Obviously, the invention is not restricted to the foregoing description, can also many operative combination.The all scenario that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention all should be thought protection scope of the present invention.
Claims (9)
1, a kind of treatment process of sea water desaltination is characterized in that, this method flow carries out successively in the following order:
A, pending seawater pump into pretreater (3) through the supercharging pump housing (2) from raw water box (1), remove
Suspended substance in the seawater, turbidity, particle, solids;
B, the clean sea water gravity flow of coming out through pretreater (3) enter intermediate water tank (5);
Clean sea water in C, the intermediate water tank (5) pumps into counter-osmosis device (7), warp by the high pressure pump housing (6) again
After crossing counter-osmosis device (7) processing, removed most of ionic fresh water in the seawater, as desalination
Product water flows out; And condensed water gravity flow enters nanofiltration device (8) and handles;
D, the water after handling through nanofiltration device (8) contain most of monovalent ion and small part high valence ion
Produce water from import the advancing that flow back into the described high pressure pump housing of step C (6) as counter-osmosis device (7)
Water, and secondary concentration water falls as discharge of wastewater.
2, the treatment process of sea water desaltination according to claim 1 is characterized in that, described pretreater (3) is a kind of full filtration ultra-filtration equipment, and has cleaning system.
3, the treatment process of sea water desaltination according to claim 2 is characterized in that, the operation of described pretreater (3) and washing unit adopt computer control, regularly, clean automatically.
4, the treatment process of sea water desaltination according to claim 1 is characterized in that, the working pressure of described counter-osmosis device (7) is 5.0～7.0Mpa, and the working pressure of described nanofiltration device (8) is 2.0～4.0Mpa.
5, the treatment process of sea water desaltination according to claim 4 is characterized in that, the working pressure of described counter-osmosis device (7) is 6.5Mpa, and the working pressure of described nanofiltration device (8) is 3.5Mpa.
6, a kind of treatment facility of sea water desaltination, comprise raw water box (1), the supercharging pump housing (2), pretreater (3), clean the pump housing (4), intermediate water tank (5), the high pressure pump housing (6), counter-osmosis device (7), nanofiltration device (8), it is characterized in that, the import of raw water box (1) is connected with seawater water intaking place, the outlet of raw water box (1) is connected with the supercharging pump housing (2) import, the outlet of the supercharging pump housing (2) is connected with the water-in of pretreater (3), the product water of pretreater (3) imports intermediate water tank (5) by outlet, the outlet of intermediate water tank (5) is connected with the import of the high pressure pump housing (6), the water outlet of the high pressure pump housing (6) is connected with the water-in of counter-osmosis device (7), the water outlet of counter-osmosis device (7) will be desalinated product water and be imported header tank, the dense water out of counter-osmosis device (7) is connected with the water-in of nanofiltration device (8), the condensed water outlet of nanofiltration device (8) bleeds off concentrated water drainage, the desalination of nanofiltration device (8) is produced water out and is connected with the import of the high pressure pump housing (6), mixes the water inlet of back as counter-osmosis device (7) with the product water of pretreater (3); The import of cleaning the pump housing (4) is connected with an outlet of intermediate water tank (5), and the outlet of cleaning the pump housing (4) is connected with the product water out of pretreater (3), and the water-in of pretreater (3) uses as the cleaning sullage discharge outlet simultaneously.
7, the treatment facility of sea water desaltination according to claim 6 is characterized in that, described pretreater (3) is 50000～200000 daltonian hollow fiber ultrafiltration membrane for molecular weight cut-off.
8, the treatment facility of sea water desaltination according to claim 7 is characterized in that, described pretreater (3) is 100000 daltonian hollow fiber ultrafiltration membrane for molecular weight cut-off.
9, the treatment facility of sea water desaltination according to claim 6, it is characterized in that, the membrane element salt clearance of described counter-osmosis device (7) is greater than 99%, and the membrane element of nanofiltration device (8) is 10～50% to the chlorion rejection, and divalent ion rejection such as sulfate radical are greater than 98%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410025329XA CN1319878C (en) | 2004-06-12 | 2004-06-12 | Treating method and apparatus for seawater desalting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410025329XA CN1319878C (en) | 2004-06-12 | 2004-06-12 | Treating method and apparatus for seawater desalting |
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| Publication Number | Publication Date |
|---|---|
| CN1583605A true CN1583605A (en) | 2005-02-23 |
| CN1319878C CN1319878C (en) | 2007-06-06 |
Family
ID=34601209
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| CNB200410025329XA Expired - Fee Related CN1319878C (en) | 2004-06-12 | 2004-06-12 | Treating method and apparatus for seawater desalting |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100445212C (en) * | 2006-06-23 | 2008-12-24 | 深圳市英尼克电器有限公司 | Control method for cyclic utilization of concentrated water in reverse-osmosis water-purifying treatment |
| CN101734820B (en) * | 2008-11-07 | 2011-12-28 | 中国石油化工股份有限公司 | Method for treating high slat-containing wastewater |
| CN102320674A (en) * | 2011-06-08 | 2012-01-18 | 集美大学 | Marine cold and heat cogeneration seawater desalting method and equipment |
| CN1958467B (en) * | 2006-09-25 | 2012-05-23 | 李�杰 | Environmental protective, water saving type method and device for producing pure water through reverse osmosis |
| CN102659272A (en) * | 2012-05-24 | 2012-09-12 | 北京赛诺水务科技有限公司 | Novel membrane-process sea water desalination and fresh water and salt preparation system and technique |
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| CN1958467B (en) * | 2006-09-25 | 2012-05-23 | 李�杰 | Environmental protective, water saving type method and device for producing pure water through reverse osmosis |
| CN101734820B (en) * | 2008-11-07 | 2011-12-28 | 中国石油化工股份有限公司 | Method for treating high slat-containing wastewater |
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| CN102320674A (en) * | 2011-06-08 | 2012-01-18 | 集美大学 | Marine cold and heat cogeneration seawater desalting method and equipment |
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| CN103936202B (en) * | 2014-05-04 | 2015-11-18 | 河南师范大学 | A kind of method for desalting brackish water and device thereof |
| CN106800351A (en) * | 2016-11-25 | 2017-06-06 | 恩那社工程有限公司 | Full Membrane seawater desalination and strong brine utilization system |
| CN107311353A (en) * | 2017-08-17 | 2017-11-03 | 苏州富特尼水务工程有限公司 | A kind of haline water zero-discharge treatment system |
| CN108975565A (en) * | 2017-12-27 | 2018-12-11 | 北京赛诺水务科技有限公司 | A kind of steel and iron industry strong brine processing unit and method |
| CN112174256A (en) * | 2019-07-05 | 2021-01-05 | 时代沃顿科技有限公司 | Reverse osmosis membrane and nanofiltration membrane integrated seawater desalination method |
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| CN1319878C (en) | 2007-06-06 |
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