CN102765781A - Method for producing drinking fresh water and concentrated seawater through reverse osmosis sea water desalinization by using concentration polarization theory - Google Patents
Method for producing drinking fresh water and concentrated seawater through reverse osmosis sea water desalinization by using concentration polarization theory Download PDFInfo
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- CN102765781A CN102765781A CN2012102844119A CN201210284411A CN102765781A CN 102765781 A CN102765781 A CN 102765781A CN 2012102844119 A CN2012102844119 A CN 2012102844119A CN 201210284411 A CN201210284411 A CN 201210284411A CN 102765781 A CN102765781 A CN 102765781A
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- reverse osmosis
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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
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
The invention relates to a method for producing drinking fresh water and concentrated seawater through reverse osmosis sea water desalinization by using a concentration polarization theory. The method is characterized in that a membrane module is vertically placed in a first-stage reverse osmosis system, characteristics of fast membrane surface concentration polarization layer forming speed and high solute concentration in a reverse osmosis sea water desalinization process under low cross flow speed are used, and concentrated solution produced by concentration polarization is timely extracted and collected from bottom of the membrane module to obtain high salinity seawater. Pollutant on the membrane surface can be timely discharged along the concentrated solution, and a seawater concentration process can be continuously and stably operated to produce strong brine with higher salinity. The pH of salinity liquid obtained by first-stage reverse osmosis is adjusted to be 8-11, and the drinking fresh water is obtained through a second-stage reverse osmosis. The method has the advantages of being low in energy consumption, high in efficiency, simple in operation and like, and being applicable to application and dissemination in industrial production.
Description
Invention field
The invention belongs to seawater comprehensive utilization field, relate to a kind of method of utilizing concentration polarization principle reverse osmosis seawater desalting to produce domestic fresh water and concentrated seawater.
Background technology
Reverse osmosis technology is the membrane separation technique of the processing seawater that grows up over nearly more than 40 years, and it has plurality of advantages such as investment is low, energy consumption is low, the construction period is short, in sea water desalinization and produce and have other technological incomparable advantage aspect the water purity.Though the conventional reverse osmosis method for desalting seawater can be produced domestic fresh water, the dense water salts contg that is produced is low, and generally below 70g/L, the economy that fully utilizes is relatively poor.The another one problem of conventional reverse osmosis method existence simultaneously is; In the process of reverse-osmosis treated seawater; Because the existence that concentration polarization and film pollute can cause the rapid decline of membrane permeation flux or the rapid rising of transmembrane pressure, thereby cause the decline of whole reverse osmosis system processing efficiency or the increase of energy consumption; Thereby, alleviate effects of Concentration Polarization as far as possible and be always the conventional reverse osmosis process and do one's utmost the target that will realize.
The present invention proposes a kind of two steps ro and handles seawater to obtain the method for high salt concentration seawater and domestic fresh water.First-stage reverse osmosis utilizes the concentration polarization principle to produce fresh water and concentrated seawater, the high salt concentration concentrated seawater that obtains can further evaporate with crystallization after obtain crude salt; The liquid that sees through of first-stage reverse osmosis is handled through two-pass reverse osmosis, can obtain domestic fresh water.
Summary of the invention
The object of the present invention is to provide a kind of method and apparatus that utilizes the concentration polarization r-o-to produce fresh water and concentrated seawater; It is characterized in that in the first-stage reverse osmosis system, membrane module is vertically placed; It is fast to utilize under the low cross-flow velocity in the reverse osmosis seawater desalting process film surface concentration polarization layer to form speed; The characteristics that solute concentration is high are in time drawn the liquid concentrator of receiving the concentration polarization layer from the film bottom, to obtain the high salt concentration seawater; The liquid that sees through that first-stage reverse osmosis obtains obtains drinkable fresh water after two-pass reverse osmosis is handled.
The form of first-stage reverse osmosis membrane module of the present invention is board-like, rolling or tubular fibre formula; Membrane material is FM or polymeric amide.The r-o-diaphragm is selected from U.S.'s Hydranautics reverse osmosis membrane, LG-DOW reverse osmosis membrane, toray reverse osmosis membrane, the U.S. Ke Shi reverse osmosis membrane a kind of.
Runner form in the one-level coiled reverse osmosis membrane assembly is a straight channel, and thickness is 28 ~ 80 mils.
Transmembrane pressure in the first-stage reverse osmosis process of the present invention is controlled between 50 ~ 70bar, extracts flow control at 0.5 ~ 6L/m
2H, salt concn is between 70 ~ 200g/L in the liquid concentrator, and the time of extraction for the first time is r-o-operation 0.5 ~ 3.5h after initial.After the liquid concentrator of the upgrading unit of first-stage reverse osmosis device reaches predetermined salt concn, can carry out continuous or intermittent extraction.
Described continuous drawing continuously carries out extraction operation after being meant that the solute concentration when reverse osmosis concentration unit bottom extraction opening reaches predetermined salt concn.
After described intermittently extracting the solute concentration that is meant reverse osmosis concentration unit bottom extraction opening and reaching predetermined salt concn; Carry out extraction operation; After the salt concn of extraction opening is lower than predetermined salt concn, stop extraction operation, after the salt concn of extraction opening reaches preset value once more; Begin to extract, so repeatable operation.
First-stage reverse osmosis device of the present invention mainly is made up of following three unit: reverse osmosis units, liquid concentrator extracting unit and online detection unit.The seawater opening for feed is arranged at the top of reverse osmosis units, and the liquid concentrator extraction opening is arranged at the bottom; The liquid concentrator extracting unit mainly is made up of extraction pump; Online detection unit mainly is made up of online electric conductivity detector.
The method and apparatus that utilizes concentration polarization principle reverse osmosis seawater desalting to produce fresh water and concentrated seawater provided by the invention has that energy consumption is low, efficient is high, simple operation and other advantages, is suitable in suitability for industrialized production, applying.
Description of drawings
Fig. 1 utilizes the concentration polarization concentrated seawater to produce the reverse osmosis unit schematic flow sheet of fresh water simultaneously.
Reference numeral
1. storage tank 2. valves 3. HPPs 4. valves 5. inlet pressure gauges 6. first-stage reverse osmosis membrane modules 7. valves 8. online conductivitimeter 9. delivery gauges 10. valves
Fig. 2 is the straight channel schematic cross-section of coiled reverse osmosis membrane assembly.
Fig. 3 is the straight channel schematic top plan view of coiled reverse osmosis membrane assembly.
Reference numeral
11. film 12. filters
Embodiment
Below in conjunction with embodiment the present invention is further specified, theme protection domain involved in the present invention is not limited only to these embodiment.
Embodiment 1: step is following:
(1) Open valve 2,4 and 10, valve-off 7;
(2) open HPP 3, be pumped to one-level rolling straight channel polyamide reverse osmose membrane assembly 6 (diaphragm is the LG-DOW reverse osmosis membrane) through pretreated seawater, regulated valve 4, the transmembrane pressure that makes reverse osmosis membrane is 50bar;
(3) open also regulated valve 7, make and extract flow control at 6L/m
2H, continuous drawing operation 8h, the liquid that sees through that obtains carries out the two-pass reverse osmosis processing;
(4) after experiment finished, the salts contg of the liquid concentrator that is drawn into from the first-stage reverse osmosis membrane module was 70g/L, improves 2.2 times than the salt concn in the seawater.See through journey with the seawater reverse osmosis of routine and compare, power consumption reduces by 26%.See through liquid and regulate pH to 9, through LG-DOW FilmTech BW30-4040 brackish water film two-pass reverse osmosis, the liquid that sees through that obtains meets drinking water standard through detection.
Embodiment 2: step is following:
(1) Open valve 2,4 and 10, valve-off 7;
(2) open HPP 3, be pumped to one-level rolling straight channel polyamide reverse osmose membrane assembly 6 (diaphragm is the LG-DOW reverse osmosis membrane) through pretreated seawater, regulated valve 4, the transmembrane pressure that makes reverse osmosis membrane is 55bar;
(3) regulated valve 7, make to extract flow control at 5L/m
2H, continuous drawing operation 8h, the liquid that sees through that obtains carries out the two-pass reverse osmosis processing;
(4) after experiment finished, the salts contg of the liquid concentrator that is drawn into from the first-stage reverse osmosis membrane module was 82g/L, improves 2.6 times than the salt concn in the seawater.See through journey with the seawater reverse osmosis of routine and compare, power consumption reduces by 24%.See through liquid and regulate pH to 10, through LG-DOW FilmTech BW30-4040 brackish water film two-pass reverse osmosis, the liquid that sees through that obtains meets drinking water standard through detection.
Embodiment 3: step is following:
(1) Open valve 2,4 and 10, valve-off 7;
(2) open HPP 3, be pumped to the conventional runner polyamide reverse osmose membrane of one-level rolling assembly 6 (diaphragm is the LG-DOW reverse osmosis membrane) through pretreated seawater, regulated valve 4, the transmembrane pressure that makes reverse osmosis membrane is 55bar;
(3) regulated valve 7, make to extract flow control at 5L/m
2H, continuous drawing operation 8h, the liquid that sees through that obtains carries out the two-pass reverse osmosis processing;
(4) after experiment finished, the salts contg of the liquid concentrator that is drawn into from the first-stage reverse osmosis membrane module was 72g/L, improves 2.3 times than the salt concn in the seawater.See through journey with the seawater reverse osmosis of routine and compare, power consumption reduces by 20%.See through liquid and regulate pH to 10, through LG-DOW FilmTech BW30-4040 brackish water film two-pass reverse osmosis, the liquid that sees through that obtains meets drinking water standard through detection.
Embodiment 4: step is following:
(1) Open valve 2,4 and 10, valve-off 7;
(2) open HPP 3, be pumped to the board-like polyamide reverse osmosis assembly 6 of one-level (diaphragm is the toray reverse osmosis membrane) through pretreated seawater, regulated valve 4, the transmembrane pressure that makes reverse osmosis membrane is 70bar;
(3) keep behind the 3h and open and regulated valve 7, make and extract flow control at 0.5L/m
2H, shut-down operation 2h behind the extraction 0.5h, and then at 0.5L/m
2The extraction flow of h extracts 0.5h, so repetitive operation 8h down;
(4) after experiment finished, the salts contg of the liquid concentrator that is drawn into from the first-stage reverse osmosis membrane module was 200g/L, improves 6.3 times than the salt concn in the seawater.See through journey with the seawater reverse osmosis of routine and compare, power consumption reduces by 11%.See through liquid and regulate pH to 10, through U.S. Ke Shi 4040-XR brackish water film two-pass reverse osmosis, the liquid that sees through that obtains meets drinking water standard through detection.
Claims (6)
1. method of utilizing concentration polarization principle reverse osmosis seawater desalting to produce domestic fresh water and concentrated seawater; It is characterized in that in the first-stage reverse osmosis system, membrane module is vertically placed; Being utilized under the low cross-flow flow velocity in the reverse osmosis seawater desalting process film surface concentration polarization layer, to form speed fast; The characteristics that solute concentration is high in time extract from the film bottom and collect the liquid concentrator that produces because of the concentration polarization effect, to obtain the high salt concentration seawater; The liquid that sees through that first-stage reverse osmosis obtains is regulated pH to 8 ~ 11, handles obtaining drinkable fresh water again through two-pass reverse osmosis.
2. method according to claim 1 is characterized in that, the form of first-stage reverse osmosis membrane module is board-like, rolling or tubular fibre formula; Membrane material is FM or polymeric amide.
3. method according to claim 2 is characterized in that, the runner form in the one-level coiled reverse osmosis membrane assembly is a straight channel, and thickness is 28 ~ 80 mils.
4. method according to claim 1 is characterized in that the transmembrane pressure in the first-stage reverse osmosis process is controlled between 50 ~ 70bar, extracts flow control at 0.5 ~ 6L/m
2H, salt concn is between 70 ~ 200g/L in the liquid concentrator, and the time of extracting liquid concentrator for the first time is r-o-operation 0.5 ~ 3.5h after initial.
5. any one utilizes concentration polarization principle reverse osmosis seawater desalting to produce the device of the method for domestic fresh water and concentrated seawater to be used for claim 1 ~ 4; It is characterized in that the device of first-stage reverse osmosis system mainly is made up of following three unit: reverse osmosis units, liquid concentrator extracting unit and online detection unit.
6. device according to claim 5 is characterized in that the seawater opening for feed is arranged at the top of reverse osmosis units, and the liquid concentrator extraction opening is arranged at the bottom; The liquid concentrator extracting unit mainly is made up of extraction pump; Online detection unit mainly is made up of online electric conductivity detector.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103466753A (en) * | 2013-08-29 | 2013-12-25 | 张英华 | Seawater reverse osmosis desalination and seawater concentration method by using concentration polarization and periodic instantaneous flushing principle |
| WO2015184789A1 (en) * | 2014-06-06 | 2015-12-10 | 蔡泮敏 | Process for producing salt by means of strong brine concentration after sea water desalination by using two-way circulation method and bromine extraction |
| CN108996616A (en) * | 2018-09-26 | 2018-12-14 | 水利部交通运输部国家能源局南京水利科学研究院 | A method of invasion seawater prevents and treats system and its protection and utilizes seawater |
| CN109414659A (en) * | 2016-07-28 | 2019-03-01 | 霍尼韦尔国际公司 | Reverse osmosis membrane and its processing method |
| CN111689601A (en) * | 2020-05-26 | 2020-09-22 | 舟山梅朋水处理有限公司 | Method for preparing fresh water with various water qualities |
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| CN2429519Y (en) * | 2000-05-18 | 2001-05-09 | 顾志龙 | Column pressure differential apparatus for desalinating and purifying water from deep well |
| CN102249459A (en) * | 2011-06-15 | 2011-11-23 | 北京科泰兴达高新技术有限公司 | System for desalinating sea water |
| CN102583839A (en) * | 2012-01-10 | 2012-07-18 | 解利昕 | Integrated method for seawater desalination, salt manufacturing and heat and electricity generation |
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2012
- 2012-08-06 CN CN2012102844119A patent/CN102765781A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2429519Y (en) * | 2000-05-18 | 2001-05-09 | 顾志龙 | Column pressure differential apparatus for desalinating and purifying water from deep well |
| CN102249459A (en) * | 2011-06-15 | 2011-11-23 | 北京科泰兴达高新技术有限公司 | System for desalinating sea water |
| CN102583839A (en) * | 2012-01-10 | 2012-07-18 | 解利昕 | Integrated method for seawater desalination, salt manufacturing and heat and electricity generation |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103466753A (en) * | 2013-08-29 | 2013-12-25 | 张英华 | Seawater reverse osmosis desalination and seawater concentration method by using concentration polarization and periodic instantaneous flushing principle |
| CN103466753B (en) * | 2013-08-29 | 2014-10-08 | 张英华 | Seawater reverse osmosis desalination and seawater concentration method |
| WO2015184789A1 (en) * | 2014-06-06 | 2015-12-10 | 蔡泮敏 | Process for producing salt by means of strong brine concentration after sea water desalination by using two-way circulation method and bromine extraction |
| US9988287B2 (en) | 2014-06-06 | 2018-06-05 | Weifang Northsea Oasis Solar Powered Technology Co., Ltd. | Process water for producing salt by means of strong brine concentration after sea water desalination by using a two-way circulation method and bromine extraction |
| CN109414659A (en) * | 2016-07-28 | 2019-03-01 | 霍尼韦尔国际公司 | Reverse osmosis membrane and its processing method |
| CN108996616A (en) * | 2018-09-26 | 2018-12-14 | 水利部交通运输部国家能源局南京水利科学研究院 | A method of invasion seawater prevents and treats system and its protection and utilizes seawater |
| CN111689601A (en) * | 2020-05-26 | 2020-09-22 | 舟山梅朋水处理有限公司 | Method for preparing fresh water with various water qualities |
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Application publication date: 20121107 |