CN104817134A - Full-membrane method seawater desalting integration system adopting ultrafiltration-nanofiltration-reverse osmosis, and full-membrane method seawater desalting integration process adopting ultrafiltration-nanofiltration-reverse osmosis - Google Patents
Full-membrane method seawater desalting integration system adopting ultrafiltration-nanofiltration-reverse osmosis, and full-membrane method seawater desalting integration process adopting ultrafiltration-nanofiltration-reverse osmosis Download PDFInfo
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Abstract
The invention relates to a full-membrane method seawater desalting integration system adopting ultrafiltration-nanofiltration-reverse osmosis, and a full-membrane method seawater desalting integration process adopting ultrafiltration-nanofiltration-reverse osmosis, wherein the nanofiltration seawater softening recovery rate can be increased, and the membrane surface scaling tendency can be reduced. According to the present invention, the nanofiltration system is a three-stage nanofiltration system, wherein the first-stage nanofiltration membrane assembly and the second-stage nanofiltration membrane assembly are adopted as the pretreatment of the reverse osmosis, and the third-stage nanofiltration membrane assembly further treats the concentrated water obtained through the first-stage nanofiltration and the second-stage nanofiltration, such that the seawater recovery rate is increased, and the scaling tendency on the nanofiltration membrane surface of the first-stage nanofiltration membrane assembly and the second-stage nanofiltration membrane assembly is reduced so as to reduce the seawater desalting cost and reduce the scaling tendency of the third-stage nanofiltration membrane assembly during the high salinity concentrated water treatment.
Description
Technical field
The invention belongs to sea water desaltination and water-treatment technology field, be specifically related to a kind of integrated system and the integrated technique that adopt the full Membrane seawater desalination of ultrafiltration-nanofiltration-reverse osmosis, technique of the present invention and device can improve the nanofiltration seawater softening rate of recovery and reduce face scaling tendency.The method of nanofiltration membrane face scaling tendency is alleviated when the invention further relates to a kind of nanofiltration membrane treatment high density salt solution.
Background technology
Nanofiltration membrane is a kind of Novel separation film developed after reverse osmosis composite membrane the eighties in 20th century, and its pore diameter range is about about 1nm between ultra-filtration membrane and reverse osmosis membrane, therefore is called nanofiltration membrane.
Nanofiltration membrane belongs to pressure drive membrane, and it has two notable features: one be its molecular weight cut-off scope is 200 ~ 1000 dalton; Two be its surface with electric charge, be generally negative charge, cause nanofiltration membrane lower to monovalent ion rejection thus, and to divalence or high valence ion, particularly dianion have very high rejection.It retains can through the small organic molecule of ultra-filtration membrane and polyvalent ion (divalence or high valence ion), the part that nanofiltration process can also retain is salt at a low price, and therefore the water treatment procedure of nanofiltration membrane can also regard synchronously carrying out of " concentrating " and " desalination " in some cases as.
The These characteristics of nanofiltration membrane makes its pre-treating technology as reverse osmosis in sea water desaltination be widely used.Seawater is removed after most of divalent ion wherein through nanofiltration membrane and is formed softening seawater, and softening seawater can as the water inlet of reverse osmosis in desalting process.Because the divalent ion of easy fouling is retained in a large number by nanofiltration membrane, thus the scale formation of reverse osmosis process can be reduced significantly, nanofiltration membrane is compared to reverse osmosis membrane simultaneously, its working pressure is low, water outlet efficiency is high, therefore utilizes nanofiltration to reduce the production cost of Seawater Desalination Project as the pre-treating technology of reverse osmosis technology.
Although the application of nanofiltration membrane improves some defects of desalination by reverse osmosis seawater, but nanofiltration system still also exists seawater utilization rate problem on the low side wherein, and due to nanofiltration retaining in a large number scale-forming ion in seawater, its face scaling tendency still clearly.Energy consumption cost in desalting process and the Membrane cleaning that brings due to face fouling even film update cost make the integral production cost of sea water desaltination or higher, therefore industry wishes to improve seawater utilization rate as much as possible, also reduces the high cost that face fouling causes hand and foot simultaneously.
Chinese patent CN103787462A discloses a kind of less energy-consumption desalination process and device thereof.Seawater enters first step reverse osmosis system after pretreatment, and it produces the water inlet of water as second stage low pressure reverse osmosis, and its dense water enters the second segment low pressure reverse osmosis system of the first step; Second stage low pressure reverse osmosis produces water for the production of tap water, and this grade of dense water produces water with the low pressure reverse osmosis of first step second segment and mixes as reclaimed water; The dense water of first step second segment enters nanofiltration system, and nanofiltration is produced water and is used as flushing supply, and the dense water of high pressure nanofiltration is again through energy recycle device pressure recovery energy.This device improves the Water Sproading rate of seawater by many-sided use and reduces energy consumption by energy recycle device.Chinese patent CN101967026A discloses a kind of energy-saving emission-reduction seawater comprehensive utilizing method high with added value with low cost.Seawater enters nanofiltration system as purifying sea water after micro-filtration and uf processing, and much filtrate is used as the processing of micro-algae.Purifying sea water obtains nanofiltration and produces water and the dense water of nanofiltration after entering nanofiltration system, nanofiltration product water enters electrodialysis system desalinates, and the dense water of nanofiltration is used as to extract element compound; The product water of electrodialysis system enters reverse osmosis system or low-temperature multi-effect system produces fresh water; The dense water of electrodialysis system mixes as extracting element compound with the dense water of nanofiltration; Reverse osmosis system or the dense water of low-temperature multi-effect system return nanofiltration system.The method utilizes the methods such as ultrafiltration, nanofiltration, electrodialysis and reverse osmosis to carry out sufficient separation to the material in seawater, and improves the Water Sproading rate of seawater.Above-mentioned two patents of the prior art all improve the Water Sproading rate of seawater by many-sided utilization, but the pollution problem of nanofiltration membrane when they do not consider process high salinity dense water, do not consider that seawater many-side utilizes the complicacy of device yet.
Chinese patent CN102701478A discloses a kind for the treatment of process of concentrated seawater, before concentrated seawater enters nanofiltration assembly, by adding hydrochloric acid adjustment seawater pH=5 ~ 7 that mass percent concentration is 1%, adds the Scale inhibitors that consumption is 0-2mg/L subsequently again.Add acid for adjusting pH and add divalent ion fouling condition when Scale inhibitors makes nanofiltration membrane treatment concentrated seawater and improve, reduce the running cost of device.The concentration that some pharmaceutical chemicalss added in water during this dense water of patent process high salinity can make it in the dense water of nanofiltration is higher, can cause interference to follow-up dense water recycling.
In prior art, in full Membrane seawater desalination process, the rate of recovery of nanofiltration system is generally about 50%, and seawater recoveries is not high, and there is certain nanofiltration face scaling fouling problem during the dense water of nanofiltration membrane treatment high salinity.This is all technical problem urgently to be resolved hurrily in field of seawater desalination.
Summary of the invention
The object of the invention is to the deficiency overcoming prior art existence, a kind of integrated system and the integrated technique that adopt the full Membrane seawater desalination of ultrafiltration-nanofiltration-reverse osmosis are provided; Improve the nanofiltration seawater softening rate of recovery and reduce face scaling tendency.In the present invention, nanofiltration system is syllogic nanofiltration system, wherein first paragraph and second segment are as the pre-treatment of reverse osmosis, 3rd section processes further to the dense water of front two sections of nanofiltrations, to improve seawater recoveries and to reduce the scaling tendency of first paragraph and second segment nanofiltration face, and then reduce sea water desaltination cost, the face scaling tendency existed when simultaneously reducing the dense water of the 3rd section of nanofiltration membrane treatment high salinity.
A kind of integrated technique adopting the integrated system of the full Membrane seawater desalination of ultrafiltration-nanofiltration-reverse osmosis can implement the full Membrane seawater desalination of described employing ultrafiltration-nanofiltration-reverse osmosis of the present invention.Technical scheme is as follows.
Adopt a full Membrane seawater desalination integrated system for ultrafiltration-nanofiltration-reverse osmosis, described system can improve the nanofiltration seawater softening rate of recovery and reduce face scaling tendency;
Described system comprises the ultrafiltration system, syllogic nanofiltration system and the reverse osmosis system that connect successively, and wherein said syllogic nanofiltration system comprises first paragraph nanofiltration membrane component, second segment nanofiltration membrane component and the 3rd section of nanofiltration membrane component;
The water producing pipe of ultrafiltration system connects the water inlet pipe of first paragraph nanofiltration membrane component, the dense water outlet pipe of first paragraph nanofiltration membrane component connects the water-in of second segment nanofiltration membrane component, and the water producing pipe of first paragraph nanofiltration membrane component and second segment nanofiltration membrane component converges rear connection reverse osmosis system; Dense water outlet pipe and the ultrafiltration system water producing pipe of reverse osmosis system converge the rear water inlet pipe being connected first paragraph nanofiltration membrane component, as concomitant regimen, the dense water outlet pipe of reverse osmosis system also can converge the rear water inlet pipe being connected second segment nanofiltration membrane component with the dense water outlet pipe of first paragraph nanofiltration membrane component; The dense water outlet pipe of second segment nanofiltration membrane component connects the water inlet pipe of the 3rd section of nanofiltration membrane component; Water producing pipe and the ultrafiltration system water producing pipe of the 3rd section of nanofiltration membrane component converge the rear water inlet pipe being connected first paragraph nanofiltration membrane component, or the water producing pipe of the 3rd section of nanofiltration membrane component converges the rear water inlet pipe being connected second segment nanofiltration membrane component with the dense water rising pipe of first paragraph nanofiltration membrane component; Dense water first outlet pipe of the 3rd section of nanofiltration membrane component by the water inlet pipe of circulation line circulation connection the 3rd section of nanofiltration membrane component, and by adding crystal seed toward this circulation line in, bringing out scale-forming ion and forming main body crystallization, thus reduction face scaling tendency; Dense water second outlet pipe of the 3rd section of nanofiltration membrane component connects relief outlet, and the dense water that relief outlet is discharged is used for salt manufacturing, bittern chemical industry or extracts chemical element.
A kind of technical scheme of the integrated technique of the full Membrane seawater desalination of ultrafiltration-nanofiltration-reverse osmosis that adopts of the present invention is as follows.
Adopt a full Membrane seawater desalination integrated technique for ultrafiltration-nanofiltration-reverse osmosis, described technique can improve the nanofiltration seawater softening rate of recovery and reduce face scaling tendency;
Described technique comprises:
Seawater through ultrafiltration system process, optionally acid adding and/or add Scale inhibitors antiscale during ultrafiltration system process;
Ultrafiltration system produces water and enters syllogic nanofiltration system; Described syllogic nanofiltration system comprises first paragraph nanofiltration membrane component, second segment nanofiltration membrane component and the 3rd section of nanofiltration membrane component;
Ultrafiltration system produces water and first enters first paragraph nanofiltration membrane component, wherein the dense water of first paragraph nanofiltration membrane component directly enters second segment nanofiltration membrane component, enters reverse osmosis system and produce desalination water after the product water mixing of first paragraph nanofiltration membrane component and second segment nanofiltration membrane component; Dense water and the ultrafiltration system of reverse osmosis system produce water and mix water inlet as first paragraph nanofiltration membrane component, or mix the water inlet as second segment nanofiltration membrane component with the dense water of first paragraph nanofiltration membrane component; The dense water of second segment nanofiltration membrane component enters the 3rd section of nanofiltration membrane component; Product water and the ultrafiltration system of the 3rd section of nanofiltration membrane component produce water and mix laggard people's first paragraph nanofiltration membrane component, or the product water pressurization of the 3rd section of nanofiltration membrane component dense water that is rear and first paragraph nanofiltration membrane component converges the rear water inlet as second segment nanofiltration membrane component; The dense water cycle of a part of the 3rd section of nanofiltration membrane component as the water inlet of the 3rd section of nanofiltration membrane component, and by adding crystal seed toward the dense water of this circulation in, being brought out scale-forming ion and being formed main body crystallization, thus reduction face scaling tendency; The dense water of another part of the 3rd section of nanofiltration membrane component is then discharged, for salt manufacturing, bittern chemical industry or extraction chemical element.
Preferably, the first paragraph nanofiltration membrane component in described syllogic nanofiltration system adopts 4 to fill putamina, and second segment nanofiltration membrane component adopts 2 to fill putamina.
Preferably, the 3rd section of described nanofiltration membrane component adopts 1 to fill or 2 dress putaminas, and it is abbreviated system.
Preferably, the 3rd section of described nanofiltration membrane component adopts the loose type nanofiltration membrane component that water flux is larger, to Ca
2+and Mg
2+rejection remain on less than 60%, to SO
4 2-rejection remain on more than 95%.
Alleviate the method for nanofiltration membrane face scaling tendency when the invention further relates to a kind of nanofiltration membrane treatment high density salt solution, described method comprises:
High density salt solution is sent into nanofiltration membrane component filter;
The product water of nanofiltration membrane component is sent into subordinate's process unit;
First part in the dense water of nanofiltration membrane component is sent into nanofiltration membrane system as water inlet by circulation line circulation; Arrange in circulation line and add crystal seed, bring out scale-forming ion and form main body crystallization, thus reduce face scaling tendency;
Second section in the dense water of nanofiltration membrane component is discharged, for salt manufacturing, bittern chemical industry or extraction chemical element.
The present invention compared with prior art, has following advantageous feature:
(1) in the present invention, first paragraph nanofiltration membrane component and second segment nanofiltration membrane component adopt the operating procedure of low pressure and the low rate of recovery, under the prerequisite ensureing water production rate and product water water quality, can reduce face scaling tendency as much as possible, and reduce energy consumption.
(2) the 3rd sections of nanofiltration membrane components adopt large flux loose type nanofiltration membrane component, just can ensure higher water production rate and the higher rate of recovery at low pressures, thus significantly reduce the usage quantity of this section of membrane element.In 3rd section of nanofiltration membrane component, although monovalent salt flux is higher, very high to bivalent ions rejection, so its monovalent ion concentration of producing in water is close with former seawater, and divalent ion especially SO
4 2-concentration far below the concentration in former seawater, this product water and former sea water mixing significantly can reduce the face scaling tendency of first paragraph and second segment nanofiltration as the water inlet of first paragraph nanofiltration.
(3) the 3rd sections of nanofiltration membrane components adopt the abbreviated system design of 1 dress or 2 dress putaminas, and dense water retention time is very short, and the crystal of precipitation can go out putamina with concentrated water drainage rapidly, thus remarkable reduction face scaling tendency.
In the dense water of (4) the 3rd sections of nanofiltration membrane component discharges, the concentration of each ion is all very high, can be used for salt manufacturing or bittern chemical industry or chemical element to extract, and because some scale-forming ions are separated out from dense water, the chemical agent dosage in the processes such as salt manufacturing therefore can be reduced.
(5) adopt syllogic nanofiltration system of the present invention, the scaling tendency of front two sections of nanofiltration membrane components is transferred on the 3rd section of nanofiltration membrane component, eliminates the face scale problems of front two sections of nanofiltration membrane components; And the 3rd section of nanofiltration membrane component adopts resistant to pollution large flux loose type nanofiltration membrane element, although there is film scale problems, the usage quantity of membrane module is few, safeguard and replacement cost relatively low.
(6) desalination process of the present invention obtains higher Water Sproading rate by lower energy consumption on the whole, reduces desalinating cost.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
In Fig. 1, Reference numeral is respectively, and 1: ultrafiltration system; 2: produce water surge tank; 3,8,13: intake pump; 4,9,14: high-pressure pump; 5: first paragraph nanofiltration membrane component; 6: second segment nanofiltration membrane component; 7,12,17: energy recycle device; 10: reverse osmosis system; 11,16,21: topping-up pump; 15: the three sections of nanofiltration membrane components; 18: settling bowl; 19: raw water pump; 20,25: recycle pump; 22,23,24: cartridge filter.
As shown in Figure 1, a kind of full Membrane seawater desalination integrated system adopting ultrafiltration-nanofiltration-reverse osmosis, described system can improve the nanofiltration seawater softening rate of recovery and reduce face scaling tendency;
Described system comprises the ultrafiltration system 1, syllogic nanofiltration system and the reverse osmosis system 10 that connect successively, and wherein said syllogic nanofiltration system comprises first paragraph nanofiltration membrane component 5, second segment nanofiltration membrane component 6 and the 3rd section of nanofiltration membrane component 15;
The water producing pipe of ultrafiltration system 1 connects the water inlet pipe of first paragraph nanofiltration membrane component 5, the dense water outlet pipe of first paragraph nanofiltration membrane component 5 connects the water-in of second segment nanofiltration membrane component 6, and the water producing pipe of first paragraph nanofiltration membrane component 5 and second segment nanofiltration membrane component 6 converges rear connection reverse osmosis system; The dense water outlet pipe of reverse osmosis system 10 converges the rear water inlet pipe being connected first paragraph nanofiltration membrane component 5 with ultrafiltration system 1 water producing pipe, as concomitant regimen, the dense water outlet pipe of reverse osmosis system 10 also can converge the rear water inlet pipe being connected second segment nanofiltration membrane component 6 with the dense water outlet pipe of first paragraph nanofiltration membrane component 5; The dense water outlet pipe of second segment nanofiltration membrane component 6 connects the water inlet pipe of the 3rd section of nanofiltration membrane component 15; Water producing pipe and the ultrafiltration system water producing pipe of the 3rd section of nanofiltration membrane component 15 converge the rear water inlet pipe being connected first paragraph nanofiltration membrane component 5, or mix the water inlet as second segment nanofiltration membrane component 6 with the dense water of first paragraph nanofiltration membrane component 5 after pressurization; Dense water first outlet pipe of the 3rd section of nanofiltration membrane component 15 by the water inlet pipe of circulation line circulation connection the 3rd section of nanofiltration membrane component 15, and by adding crystal seed toward this circulation line in, bringing out scale-forming ion and forming main body crystallization, thus reduction face scaling tendency; Dense water second outlet pipe of the 3rd section of nanofiltration membrane component 15 connects relief outlet, and the dense water that relief outlet is discharged is used for salt manufacturing, bittern chemical industry or extracts chemical element.
Lower mask body introduces a kind of full Membrane seawater desalination integrated technique adopting ultrafiltration-nanofiltration-reverse osmosis, and described technique can improve the nanofiltration seawater softening rate of recovery and reduce face scaling tendency; Described technique comprises:
Seawater is through ultrafiltration system process, and suitably acid adding and add Scale inhibitors antiscale;
Ultrafiltration system produces water and enters syllogic nanofiltration system; Described syllogic nanofiltration system comprises first paragraph nanofiltration membrane component, second segment nanofiltration membrane component and the 3rd section of nanofiltration membrane component, wherein, first paragraph nanofiltration membrane component adopts 4 to fill putamina, and second segment nanofiltration membrane component adopts 2 to fill putamina, and the 3rd section of nanofiltration membrane component adopts 1 to fill putamina;
Ultrafiltration system produces water and enters first paragraph nanofiltration membrane component through intake pump and high-pressure pump supercharging, and working pressure is 3.0MPa; The dense water of first paragraph nanofiltration membrane component directly enters second segment nanofiltration membrane component; The rate of recovery of front two sections of nanofiltration membrane components remains on about 40%-50%, remains on about 90% to the rejection of each ion;
Enter reverse osmosis system after the product water mixing of first paragraph nanofiltration membrane component and second segment nanofiltration membrane component and produce desalination water; Dense water and the ultrafiltration system of reverse osmosis system produce water and mix water inlet as first paragraph nanofiltration membrane component; The dense water of release of second segment nanofiltration membrane component enters the 3rd section of nanofiltration membrane component through intake pump and high-pressure pump supercharging, the working pressure of the 3rd section of nanofiltration membrane component is about 2.6MPa, about 20% is remained on to the rejection of monovalent salt, 80%-90% is remained on to the rejection of divalent salts; The product water of the 3rd section of nanofiltration membrane component enters second segment nanofiltration membrane component after mixing with the dense water of nanofiltration first paragraph after pressurization; The dense water of the 3rd section of nanofiltration membrane component enters settling bowl, along with the sedimentation of crystallize out, supernatant liquid 35% circulates as the water inlet of this section of nanofiltration, and adds crystal seed and bring out scale-forming ion crystallization in the dense water of circulation, and the rate of recovery of the 3rd section of nanofiltration membrane component remains on about 60%.All the other 65% dense water of 3rd section of nanofiltration are then discharged, for salt manufacturing.
The overall rate of recovery of syllogic nanofiltration system reaches about 75%.The water quality of each stream stock is as shown in table 1.
Table 1 respectively flows the water quality of stock
Claims (6)
1. adopt an integrated system for the full Membrane seawater desalination of ultrafiltration-nanofiltration-reverse osmosis, it is characterized in that, described system can improve the nanofiltration seawater softening rate of recovery and reduce face scaling tendency;
Described system comprises the ultrafiltration system, syllogic nanofiltration system and the reverse osmosis system that connect successively, and wherein said syllogic nanofiltration system comprises first paragraph nanofiltration membrane component, second segment nanofiltration membrane component and the 3rd section of nanofiltration membrane component;
The water producing pipe of ultrafiltration system connects the low-pressure pump water inlet pipe of first paragraph nanofiltration membrane component, the dense water outlet pipe of first paragraph nanofiltration membrane component connects the water-in of second segment nanofiltration membrane component, and the water producing pipe of first paragraph nanofiltration membrane component and second segment nanofiltration membrane component converges rear connection reverse osmosis system; Dense water outlet pipe and the ultrafiltration system water producing pipe of reverse osmosis system converge the rear water inlet pipe being connected first paragraph nanofiltration membrane component, or the dense water outlet pipe of reverse osmosis system converges the rear water inlet pipe being connected second segment nanofiltration membrane component with the dense water outlet pipe of first paragraph nanofiltration membrane component; The dense water outlet pipe of second segment nanofiltration membrane component connects the water inlet pipe of the 3rd section of nanofiltration membrane component; Water producing pipe and the ultrafiltration system water producing pipe of the 3rd section of nanofiltration membrane component converge the rear water inlet pipe being connected first paragraph nanofiltration membrane component, or the water producing pipe of the 3rd section of nanofiltration membrane component converges the rear water inlet pipe being connected second segment nanofiltration membrane component with the dense water outlet pipe of first paragraph nanofiltration membrane component; Dense water first outlet pipe of the 3rd section of nanofiltration membrane component by the water inlet pipe of circulation line circulation connection the 3rd section of nanofiltration membrane component, and by adding crystal seed toward this circulation line in, bringing out scale-forming ion and forming main body crystallization, thus reduction face scaling tendency; Dense water second outlet pipe of the 3rd section of nanofiltration membrane component connects relief outlet, and the dense water that relief outlet is discharged is used for salt manufacturing, bittern chemical industry or extracts chemical element.
2. adopt an integrated technique for the full Membrane seawater desalination of ultrafiltration-nanofiltration-reverse osmosis, it is characterized in that, described technique can improve the nanofiltration seawater softening rate of recovery and reduce face scaling tendency; Described technique comprises:
Seawater through ultrafiltration system process, optionally acid adding and/or add Scale inhibitors antiscale during ultrafiltration system process;
Ultrafiltration system produces water and enters syllogic nanofiltration system; Described syllogic nanofiltration system comprises first paragraph nanofiltration membrane component, second segment nanofiltration membrane component and the 3rd section of nanofiltration membrane component;
Ultrafiltration system produces water and first enters first paragraph nanofiltration membrane component, wherein the dense water of first paragraph nanofiltration membrane component directly enters second segment nanofiltration membrane component, enters reverse osmosis system and produce desalination water after the product water mixing of first paragraph nanofiltration membrane component and second segment nanofiltration membrane component; Dense water and the ultrafiltration system of reverse osmosis system produce water and mix water inlet as first paragraph nanofiltration membrane component, or mix the water inlet as second segment nanofiltration membrane component with the dense water of first paragraph nanofiltration membrane component; The dense water of second segment nanofiltration membrane component enters the 3rd section of nanofiltration membrane component; Product water and the ultrafiltration system of the 3rd section of nanofiltration membrane component produce after water mixes and enter first paragraph nanofiltration membrane component, or the product water pressurization of the 3rd section of nanofiltration membrane component dense water that is rear and first paragraph nanofiltration membrane component converges the rear water inlet as second segment nanofiltration membrane component; The dense water cycle of a part of the 3rd section of nanofiltration membrane component as the water inlet of the 3rd section of nanofiltration membrane component, and by adding crystal seed toward the dense water of this circulation in, being brought out scale-forming ion and being formed main body crystallization, thus reduction face scaling tendency; The dense water of another part of the 3rd section of nanofiltration membrane component is then discharged, for salt manufacturing, bittern chemical industry or extraction chemical element.
3. technique according to claim 2, is characterized in that, the first paragraph nanofiltration membrane component in described syllogic nanofiltration system adopts 4 to fill putamina, and second segment nanofiltration membrane component adopts 2 to fill putamina.
4. technique according to claim 2, is characterized in that, the 3rd section of described nanofiltration membrane component adopts 1 to fill or 2 dress putaminas.
5. technique according to claim 2, is characterized in that, the 3rd section of described nanofiltration membrane component adopts the loose type nanofiltration membrane component that water flux is larger, to Ca
2+and Mg
2+rejection remain on less than 60%, to SO
4 2-rejection remain on more than 95%.
6. alleviate a method for nanofiltration membrane face scaling tendency during nanofiltration membrane treatment high density salt solution, it is characterized in that, described method comprises:
High density salt solution is sent into nanofiltration membrane component filter;
The product water of nanofiltration membrane component is sent into subordinate's process unit;
First part in the dense water of nanofiltration membrane component is sent into nanofiltration membrane system as water inlet by circulation line circulation; Arrange in circulation line and add crystal seed, bring out scale-forming ion and form main body crystallization, thus reduce face scaling tendency;
Second section in the dense water of nanofiltration membrane component is discharged, for salt manufacturing, bittern chemical industry or extraction chemical element.
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| CN112358011A (en) * | 2020-11-16 | 2021-02-12 | 淄博格瑞水处理工程有限公司 | Energy-saving seawater desalination device |
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| CN115259418A (en) * | 2022-07-22 | 2022-11-01 | 淄博格瑞水处理工程有限公司 | Low-pressure seawater desalination device |
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| CN105174512A (en) * | 2015-08-24 | 2015-12-23 | 神华集团有限责任公司 | Processing method of salt containing water and salt containing processing system |
| CN105174512B (en) * | 2015-08-24 | 2017-08-29 | 神华集团有限责任公司 | A kind of processing method of brackish water and a kind of saliferous water treatment system |
| CN109963814A (en) * | 2016-07-20 | 2019-07-02 | 巴西石油公司 | For handling the hybrid system and method for the recovered water and seawater that refill in the oil reservoir of seabed |
| CN106082483A (en) * | 2016-08-29 | 2016-11-09 | 山东天瑞重工有限公司 | A kind of novel boats and ships desalination process and device |
| CN112358011A (en) * | 2020-11-16 | 2021-02-12 | 淄博格瑞水处理工程有限公司 | Energy-saving seawater desalination device |
| CN114133085A (en) * | 2021-11-11 | 2022-03-04 | 山东海化集团有限公司 | Method and device for improving crystallization precipitation rate in process of producing magnesium sulfate by evaporating seawater |
| CN114163049A (en) * | 2021-11-11 | 2022-03-11 | 山东海化集团有限公司 | Method for preparing magnesium sulfate heptahydrate by brine membrane method |
| CN114163049B (en) * | 2021-11-11 | 2023-10-24 | 山东海化集团有限公司 | Method for preparing magnesium sulfate heptahydrate by brine film method |
| CN114133085B (en) * | 2021-11-11 | 2023-10-31 | 山东海化集团有限公司 | Method and device for improving crystallization rate in process of producing magnesium sulfate by evaporating seawater |
| CN115259418A (en) * | 2022-07-22 | 2022-11-01 | 淄博格瑞水处理工程有限公司 | Low-pressure seawater desalination device |
| CN115259418B (en) * | 2022-07-22 | 2023-12-22 | 淄博格瑞水处理工程有限公司 | Low-pressure sea water desalting device |
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