CN107265734A - A kind of reverse osmosis concentrated seawater treatment system and method - Google Patents
A kind of reverse osmosis concentrated seawater treatment system and method Download PDFInfo
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- CN107265734A CN107265734A CN201710657593.2A CN201710657593A CN107265734A CN 107265734 A CN107265734 A CN 107265734A CN 201710657593 A CN201710657593 A CN 201710657593A CN 107265734 A CN107265734 A CN 107265734A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/447—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by membrane distillation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
The invention discloses a kind of reverse osmosis concentrated seawater treatment system and method, its method is：Use reverse osmosis concentrated seawater treatment system；Reverse osmosis concentrated seawater sequentially passes through cartridge filter filtering, after regulation pH, supercharging hot material liquid is obtained after nanofiltration membrane component, resin demineralizer, heater box, hot material liquid passes through membrane component, production water and dense feed liquid are obtained, carrying out processing to dense feed liquid by bipolar membrane electrodialysis technique obtains acid solution and alkali lye；Present invention softening efficiency high, membrane distillation operation temperature is low, and disengagement area is big, and effluent quality is high, and steam latent heat realizes internal recovering；Because membrane distillation by concentration is influenceed small, carry out depth concentration and obtain the dense feed liquid for being conducive to bipolar membrane electrodialysis process efficient to run, the value for obtaining soda acid product is higher than solid salt, and compared with conventional art, energy-conservation, production process is safer, environmental protection.Soda acid prepared by the present invention can be used for nanofiltration scale inhibition and resin regeneration, whole system is added extra chemical drugs dosage and reduces, reduces cost.
Description
Technical field
The present invention relates to water technology, more particularly to a kind of reverse osmosis concentrated seawater treatment system and method.
Background technology
Desalinization turns into the important channel for opening up water source, and the rate of recovery of desalinization typically only has 40%-50%,
Current concentrated seawater is usually directly to flow back to sea without processing, and the discharge of concentrated seawater causes the huge waste and ocean ring of resource
The pollution in border, therefore, how to dispose concentrated seawater is that the sustainable development of desalinization industry must be suffered from a problem that.
Patent No. 201110411270.8,201110069347.8 and 201210150064.0 discloses some counter-infiltrations
Concentrated seawater processing method, such as using dosing, ionic membrane, ion exchange resin method as prime handle remove calcium ions and magnesium ions or
Extract after calcium calcium and magnesium product, concentration salt manufacturing is carried out finally by evaporative crystallization technique.The concentrated seawater pre-treatment of these methods needs
Add substantial amounts of chemical drugs dosage, and pretreated concentrated seawater be directly evaporated crystallization, it is necessary to larger system bulk and
Higher operation temperature, causes that system investments are big, floor space is big and operating cost is high.
The content of the invention
The purpose of the present invention is to overcome the deficiencies in the prior art, with reference to membrane distillation cryogenic conditions depth concentration advantage and
A kind of bipolar membrane electrodialysis efficiently preparing soda acid advantage there is provided reverse osmosis concentrated seawater treatment system and side under the conditions of high salinity
Method.
Technical scheme is summarized as follows：
A kind of reverse osmosis concentrated seawater treatment system, including cartridge filter 1, the cartridge filter 1 by pipeline successively
With the hot material liquid of high-pressure pump 2, nanofiltration membrane component 3, resin demineralizer 4, heater box 5, membrane distillation circulating pump 6 and membrane component 7
Import 7-1 connections；The hot material liquid outlet 7-3 of membrane component 7 be connected by pipeline with cooler 8 after again by pipeline respectively with
The cold liquor inlet 7-2 and raw material flow container 10 of membrane component 7 are connected；Raw material flow container 10 passes through pipeline and bipolar membrane electrodialysis film
Heap 18 negative pole connection, raw material flow container 10 by pipeline successively with material liquid circulating pump 14, bipolar membrane electrodialysis membrane stack 18 just
Pole is connected；The cold material liquid outlet 7-4 of membrane component 7 is connected by pipeline with heater box 5；The production water out of membrane component 7
7-5 is connected by pipeline with production water pot 9；Doughnut microporous hydrophobic membrane 7-6 is internally provided with membrane component 7 and hollow
Fiber condenser pipe 7-7, the two ends of doughnut microporous hydrophobic membrane are connected with hot liquor inlet 7-1 and hot material liquid outlet 7-3 respectively；
Doughnut condenser pipe 7-7 two ends are connected with cold liquor inlet 7-2 and cold material liquid outlet 7-4 respectively；Sour tank 11 passes through pipeline
It is connected with the negative pole of bipolar membrane electrodialysis membrane stack 18, sour tank 11 is connected by pipeline with acid circulating pump 15；Acid circulating pump 15 passes through
Pipeline is connected with the positive pole and acid storage tank 21 of bipolar membrane electrodialysis membrane stack 18 respectively；Alkali tank 12 passes through pipeline and bipolar membrane electrodialysis
The negative pole connection of membrane stack 18, alkali tank 12 is connected by pipeline with alkali circulating pump 16, alkali circulating pump 16 by pipeline respectively with it is bipolar
The positive pole and alkali storage tank 20 of EDBM membrane stack 18 are connected；Pole water pot 13 passes through pipeline and the negative pole of bipolar membrane electrodialysis membrane stack 18
Connection, positive pole of the pole water pot 13 by pipeline successively with pole water-circulating pump 17, bipolar membrane electrodialysis membrane stack 18 is connected；Alkali storage tank 20
Pump 23, resin demineralizer 4 are added with alkali successively by pipeline to be connected；Acid storage tank 21 adds pump 22 by pipeline and acid and is connected；Acid
Pump 22 is added to be connected by pipeline import respectively with high-pressure pump 2 and resin demineralizer 4；The two ends of voltage-stabilized power supply 19 respectively with it is double
The negative pole electrical connection of the positive pole and bipolar membrane electrodialysis membrane stack 18 of pole EDBM membrane stack 18.
The nanofiltration membrane component be high selectivity nanofiltration membrane component, the model XCN of the high selectivity nanofiltration membrane component,
HYDRApro or DK.
Resin in the resin demineralizer is the high TDS of tolerance macropore weak acid positive resin, the macropore of the high TDS of tolerance
The model IRC83 or IRC76CRF of weak acid positive resin.
The both positive and negative polarity of the voltage-stabilized power supply 19 mutually switches.
A kind of reverse osmosis concentrated method of seawater treatment, comprises the following steps：
(1) usage right requires a kind of one of 1-4 reverse osmosis concentrated seawater treatment system；
(2) reverse osmosis concentrated seawater is passed through into cartridge filter 1 to be filtered, removes graininess impurity, obtain pretreatment production
Water；
(3) will pre-process production water with the acid for adjusting pH that pump 22 adds is added from acid is after 2~4, to be pressurized by high-pressure pump 2
To 1.5MPa~2.5MPa, be passed through nanofiltration membrane component 3 and carry out primary sofening treatment, remove 70%~90% hardness ions and point
Organic matter of the son amount more than 200, obtains nanofiltration soft water；Nanofiltration soft water is passed through resin demineralizer 4 and carries out depth sofening treatment again,
The hardness ions of removal more than 99%, obtains resin soft water, and resin soft water is heated to 60 DEG C~90 DEG C into heater box, obtains heat
Feed liquid；After the resin saturation of the resin demineralizer, startup acid adds pump 22 successively and alkali adds pump 23 and carries out resin regeneration；
(4) the doughnut microporous hydrophobic membrane 7-6 that hot material liquid is delivered to membrane component by membrane distillation circulating pump 6 is produced
Steam, produces the hot material liquid after steam and is cooled to 20 DEG C~30 DEG C by cooler 8, the feed liquid after cooling is divided to two strands, one work
The doughnut condenser pipe 7-7 recovered steam latent heat of membrane component is back to for cold burden liquid, while producing fresh water, fresh water is passed through
Production water pot 9 is collected；Cold burden liquid after recovered steam latent heat is delivered to heater box 5 and carries out reheating, circulates according to this；Work as heater box
Feed liquid be concentrated into mass concentration for after 15%~25%, another stock is delivered into raw material flow container 10, obtain dense feed liquid；
(5) material liquid circulating pump 14, acid circulating pump 15, alkali circulating pump 16 and pole water-circulating pump 17 are opened successively, respectively will
The dense feed liquid, acid solution, alkali lye, pole water are delivered to bipolar membrane electrodialysis membrane stack positive pole, after after stability of flow, open voltage-stabilized power supply
19, regulation to bipolar membrane electrodialysis membrane stack operation electric current density 20mA/cm2~50mA/cm2, bipolar membrane electrodialysis membrane stack produces sour
Alkali；
After the acid solution mass concentration of sour tank reaches 5%~12%, acid storage tank 21 is delivered to by acid circulating pump 15；Work as alkali
After the alkali lye mass concentration of tank reaches 5%~12%%, acid storage tank 20 is delivered to by alkali circulating pump 16.
The coolant of cooler 8 is the concentrated water of nanofiltration membrane component, original reverse osmosis concentrated seawater or seawater.
Initial acid solution in sour tank 11 is the aqueous hydrochloric acid solution that the mass concentration prepared in advance is 0.2%~0.5%, alkali tank
Initial alkali lye in 12 is the pole in the sodium hydrate aqueous solution that the mass concentration prepared in advance is 0.2%~0.5%, pole water pot
Water is the aqueous sodium persulfate solution or potassium sulfate solution that the mass concentration prepared in advance is 1%~3%.
It is of the invention to have essential difference with traditional reverse osmosis concentrated method of seawater treatment, improve reverse osmosis concentrated Seawater Treatment
Efficiency, and have further the advantage that：
1. the coupling softening process softened using nanofiltration softening and resin, has given full play to the advantage of two kinds of softening technologies,
Soften efficiency higher.
2. the operation temperature of membrane distillation technique is low, disengagement area is big, and effluent quality is high, and steam latent heat can realize internal return
Receive；Further, since membrane distillation technique is influenceed smaller by concentration, depth concentration acquisition can be carried out and be conducive to bipolar membrane electrodialysis technique
The dense feed liquid of Effec-tive Function.
3. bipolar membrane electrodialysis technique eliminates tradition evaporation, the high energy consumption of crystallization process, the value of gained soda acid product
Higher than this meagre profit product of solid salt, and compared with traditional salt electrolysis method, diaphragm process prepare soda acid, more save, it is raw
Production process is safer, environmental protection.
4. soda acid prepared by bipolar membrane electrodialysis technique can be used for nanofiltration scale inhibition and resin regeneration so that whole system is added
Extra chemical drugs dosage reduces, so as to significantly reduce operating cost.
Brief description of the drawings
Fig. 1 is reverse osmosis concentrated seawater treatment system structural representation of the invention；
1. cartridge filter；2. high-pressure pump；3. nanofiltration membrane component；4. resin demineralizer；5. heater box；6. membrane distillation is circulated
Pump；7. membrane component；The hot liquor inlet of 7-1；The cold liquor inlet of 7-2；The hot material liquid outlets of 7-3；Cold material liquid outlet 7-4；Produce water
Export 7-5；Doughnut microporous hydrophobic membrane 7-6；Doughnut condenser pipe 7-7；8. cooler；9. produce water pot；10. material liquid
Tank；11 sour tanks；12 alkali tanks；13. pole water pot；14. material liquid circulating pump；15. acid circulating pump；16. alkali circulating tank；17. pole water is followed
Ring pump；18 bipolar membrane electrodialysis membrane stacks；19. voltage-stabilized power supply；20. alkali storage tank；21. acid storage tank；22. acid adds pump；23. alkali is added
Pump
Embodiment
The system of the present invention is further described below by Figure of description.
A kind of reverse osmosis concentrated seawater treatment system, (see Fig. 1) includes cartridge filter 1, and the cartridge filter 1 passes through pipe
Road successively with high-pressure pump 2, nanofiltration membrane component 3, resin demineralizer 4, heater box 5, membrane distillation circulating pump 6 and membrane component 7
Hot liquor inlet 7-1 connections；The hot material liquid outlet 7-3 of membrane component 7 be connected by pipeline with cooler 8 after again by pipeline
It is connected respectively with the cold liquor inlet 7-2 and raw material flow container 10 of membrane component 7；Raw material flow container 10 passes through pipeline and Bipolar Membrane electricity
Dialysis membrane stack 18 negative pole connection, raw material flow container 10 by pipeline successively with material liquid circulating pump 14, bipolar membrane electrodialysis membrane stack
18 positive pole connection；The cold material liquid outlet 7-4 of membrane component 7 is connected by pipeline with heater box 5；The production of membrane component 7
Water out 7-5 is connected by pipeline with production water pot 9；Doughnut microporous hydrophobic membrane 7-6 is internally provided with membrane component 7
With doughnut condenser pipe 7-7, the material of doughnut microporous hydrophobic membrane and doughnut condenser pipe is polytetrafluoroethylene (PTFE), quantity
Than for 1:4, the two ends of doughnut microporous hydrophobic membrane are connected with hot liquor inlet 7-1 and hot material liquid outlet 7-3 respectively；Hollow fibre
Dimension condenser pipe 7-7 two ends are connected with cold liquor inlet 7-2 and cold material liquid outlet 7-4 respectively；Sour tank 11 by pipeline with it is bipolar
The negative pole connection of EDBM membrane stack 18, sour tank 11 is connected by pipeline with acid circulating pump 15；Acid circulating pump 15 passes through pipeline point
It is not connected with the positive pole and acid storage tank 21 of bipolar membrane electrodialysis membrane stack 18；Alkali tank 12 passes through pipeline and bipolar membrane electrodialysis membrane stack 18
Negative pole connection, alkali tank 12 is connected by pipeline with alkali circulating pump 16, alkali circulating pump 16 by pipeline respectively with Bipolar Membrane electric osmose
The positive pole and alkali storage tank 20 for analysing membrane stack 18 are connected；Pole water pot 13 is connected by pipeline with the negative pole of bipolar membrane electrodialysis membrane stack 18,
Positive pole of the pole water pot 13 by pipeline successively with pole water-circulating pump 17, bipolar membrane electrodialysis membrane stack 18 is connected；Alkali storage tank 20 passes through
Pipeline adds pump 23, resin demineralizer 4 with alkali and is connected successively；Acid storage tank 21 adds pump 22 by pipeline and acid and is connected；Acid is added
Pump 22 is connected by pipeline import respectively with high-pressure pump 2 and resin demineralizer 4；The two ends of voltage-stabilized power supply 19 respectively with Bipolar Membrane
The negative pole electrical connection of the positive pole and bipolar membrane electrodialysis membrane stack 18 of electrodialysis membrane stack 18.
The preferred high selectivity nanofiltration membrane component of nanofiltration membrane component, for example：XCN, can also be selected：HYDRApro or DK.
XCN (Dow Chemical), HYDRApro (Hydranautics company), DK (General Electric) can also select function
The other nanofiltration membrane components close with above-mentioned high selectivity nanofiltration membrane component.
Resin in the resin demineralizer is the high TDS of tolerance macropore weak acid positive resin, the macropore of the high TDS of tolerance
The model IRC83 or IRC76CRF of weak acid positive resin.
IRC83 (Dow Chemical) or IRC76CRF (Dow Chemical).
Can also be from the property macropore weak acid positive resin close with above-mentioned model.
The both positive and negative polarity of voltage-stabilized power supply 19 mutually switches.
The method of the present invention is further detailed to crossing embodiment below.
Embodiment 1
A kind of reverse osmosis concentrated method of seawater treatment, comprises the following steps：
(1) a kind of above-mentioned reverse osmosis concentrated seawater treatment system is used；
(2) by reverse osmosis concentrated seawater, (salt content 45887mg/L, pH are 8.0, wherein Ca2+For 521mg/L, Mg2+For
1620mg/L) it is passed through cartridge filter 1 (using filtering accuracy for 5 μm of filter core) to be filtered, removes graininess impurity, obtain
Pretreatment production water；
(3) will pre-process production water with the acid for adjusting pH that pump 22 adds is added from acid is after 4, to be pressurized to by high-pressure pump 2
1.5MPa, is passed through nanofiltration membrane component 3 (using XCN models) and carries out primary sofening treatment, remove the hardness of 70%~90% scope
The organic matter of ion and molecular weight more than 200, obtains nanofiltration soft water (nanofiltration soft water salt content 38100mg/L, wherein Ca2+For
196mg/L, Mg2+For 210mg/L)；Nanofiltration soft water is passed through resin demineralizer 4 (using the macropore weak acid Yang Shu of IRC83 models again
Fat) depth sofening treatment is carried out, more than 99% hardness ions is removed, resin soft water (resin soft water salt content is obtained
38450mg/L, wherein Ca2+For 2.2mg/L, Mg2+For 1.6mg/L)；Resin soft water is heated to 90 DEG C into heater box, obtains heat
Feed liquid；After the resin saturation of resin demineralizer 4, startup acid adds pump 22 successively and alkali adds pump 23 and carries out resin regeneration；
(4) the doughnut microporous hydrophobic membrane 7-6 that hot material liquid is delivered to membrane component by membrane distillation circulating pump 6 is produced
Steam, produces the hot material liquid after steam and is cooled to 30 DEG C by cooler 8 (coolant uses original reverse osmosis concentrated seawater)；Cooling
Feed liquid afterwards is divided to two strands, and one is back to the doughnut condenser pipe 7-7 recovered steam latent heat of membrane component as cold burden liquid,
Fresh water (fresh water salt content is 9.3mg/L, meets national drinking water standard) is produced simultaneously, and fresh water is passed through production water pot 9 and collected；Reclaim
Cold burden liquid after steam latent heat is delivered to heater box 5 and carries out reheating, circulates according to this；When the feed liquid of heater box is concentrated into quality
Concentration is 15%；Afterwards, another stock is delivered to raw material flow container 10, obtains dense feed liquid；
(5) material liquid circulating pump 14, acid circulating pump 15, alkali circulating pump 16 and pole water-circulating pump 17 are opened successively, respectively will
The dense feed liquid, acid solution, alkali lye, pole water are delivered to bipolar membrane electrodialysis membrane stack, and (Bipolar Membrane is BPM-I type bipolar membranes, cavity block
For JAM-II type homogeneous-phase anion exchange films, anode membrane is JCM-II types homogeneous phase cation exchange film) positive pole；After after stability of flow,
Open voltage-stabilized power supply 19, regulation to bipolar membrane electrodialysis membrane stack operation electric current density 20mA/cm2, the production of bipolar membrane electrodialysis membrane stack
Raw soda acid；
After the acid solution mass concentration of sour tank reaches 5%, acid storage tank 21 is delivered to by acid circulating pump 15；When the alkali of alkali tank
After liquid mass concentration reaches 5%, acid storage tank 20 is delivered to by alkali circulating pump 16；
The coolant of cooler 8 is the concentrated water of nanofiltration membrane component, original reverse osmosis concentrated seawater or seawater；
During initial acid solution in sour tank 11 is the aqueous hydrochloric acid solution that the mass concentration prepared in advance is 0.2%, alkali tank 12
Initial alkali lye is that the pole water in the sodium hydrate aqueous solution that the mass concentration prepared in advance is 0.2%, pole water pot is advance preparation
Mass concentration be 1% aqueous sodium persulfate solution, the acid solution finally prepared and alkali lye mass concentration are respectively 5% and 5%.
Embodiment 2
A kind of reverse osmosis concentrated method of seawater treatment, comprises the following steps：
(1) a kind of above-mentioned reverse osmosis concentrated seawater treatment system is used；
(2) by reverse osmosis concentrated seawater, (salt content 47620mg/L, pH are 8.0, wherein Ca2+For 572mg/L, Mg2+For
1690mg/L) it is passed through cartridge filter 1 (using filtering accuracy for 5 μm of filter core) to be filtered, removes graininess impurity, obtain
Pretreatment production water；
(3) will pre-process production water with the acid for adjusting pH that pump 22 adds is added from acid is after 2, to be pressurized to by high-pressure pump 2
2.5MPa, is passed through nanofiltration membrane component 3 (using HYDRApro models or DK models) and carries out primary sofening treatment, remove 70%~
Organic matter of the hardness ions and molecular weight of 90% scope more than 200, obtains nanofiltration soft water (nanofiltration soft water salt content
39120mg/L, wherein Ca2+For 285mg/L, Mg2+For 249mg/L)；Nanofiltration soft water is passed through the (use of resin demineralizer 4 again
The macropore weak acid positive resin of IRC76CRF models) depth sofening treatment is carried out, more than 99% hardness ions is removed, resin is obtained
Soft water (resin soft water salt content 40320mg/L, wherein Ca2+For 3.0mg/L, Mg2+For 1.4mg/L)；Resin soft water enters heating
Case is heated to 60 DEG C, obtains hot material liquid；After the resin saturation of resin demineralizer 4, startup acid adds pump 22 successively and alkali is added
Pump 23 carries out resin regeneration；
(4) the doughnut microporous hydrophobic membrane 7-6 that hot material liquid is delivered to membrane component by membrane distillation circulating pump 6 is produced
Steam, produces the hot material liquid after steam cold by cooler 8 (coolant uses seawater, can also use the concentrated water of nanofiltration membrane component)
But to 20 DEG C；Feed liquid after cooling is divided to two strands, and one is back to the doughnut condenser pipe 7-7 of membrane component as cold burden liquid
Recovered steam latent heat, while producing fresh water (fresh water salt content is 11.6mg/L, meets national drinking water standard), fresh water is passed through production
Water pot 9 is collected；Cold burden liquid after recovered steam latent heat is delivered to heater box 5 and carries out reheating, circulates according to this；When heater box
Feed liquid is concentrated into mass concentration for after 25%, another stock is delivered into raw material flow container 10, obtains dense feed liquid；
(5) material liquid circulating pump 14, acid circulating pump 15, alkali circulating pump 16 and pole water-circulating pump 17 are opened successively, respectively will
The dense feed liquid, acid solution, alkali lye, pole water are delivered to bipolar membrane electrodialysis membrane stack, and (Bipolar Membrane is BPM-I type bipolar membranes, cavity block
For JAM-II type homogeneous-phase anion exchange films, anode membrane is JCM-II types homogeneous phase cation exchange film) positive pole；After after stability of flow,
Open voltage-stabilized power supply 19, regulation to bipolar membrane electrodialysis membrane stack operation electric current density 50mA/cm2, the production of bipolar membrane electrodialysis membrane stack
Raw soda acid；
After the acid solution mass concentration of sour tank reaches 12%, acid storage tank 21 is delivered to by acid circulating pump 15；When alkali tank
After alkali lye mass concentration reaches 12%, acid storage tank 20 is delivered to by alkali circulating pump 16；
The coolant of cooler 8 is the concentrated water of nanofiltration membrane component, original reverse osmosis concentrated seawater or seawater；
During initial acid solution in sour tank 11 is the aqueous hydrochloric acid solution that the mass concentration prepared in advance is 0.5%, alkali tank 12
Initial alkali lye is that the pole water in the sodium hydrate aqueous solution that the mass concentration prepared in advance is 0.5%, pole water pot is advance preparation
Mass concentration be 3% potassium sulfate solution, the acid solution finally prepared and alkali lye mass concentration are respectively 12% and 12%.
From upper result of the test, using the method for the present invention, processing can be carried out to reverse osmosis concentrated seawater and be available for
The fresh water and the soda acid of industrial application drunk.
Heater box is heated, it is possible to use the low-grade heat source such as used heat, underground heat or solar energy in industrial production.
Nanofiltration concentrated water can be handled further, and processing mode has a variety of, and calcium and magnesium product or direct can be extracted by Dual alkali
Security personnel's filtering pretreatment is returned to after alkaline chemical precipitation, so as to realize the zero-emission of whole technique.
Using solution such as sodium sulphate, potassium sulfates as pole water, the H produced is electrolysed in both positive and negative polarity+And OH-Mutually neutralize, it is to avoid
The generation of pernicious gas.
The coupling technique that the present invention is softened using nanofiltration softening and resin, gives full play to nanofiltration softening in high rigidity field
Advantage and resin soften the advantage in soft field, and the production water hardness after resin softening is relatively low, is carried out beneficial to membrane distillation technique
Depth is concentrated.
Because membrane distillation realizes 100% retention to ion in theory, therefore producing water water quality is preferably, and can directly reclaim makes
With.Further, since membrane distillation is influenceed smaller by concentration, the depth concentration of reverse osmosis concentrated seawater can be carried out, the dense feed liquid of acquisition has
The current efficiency of system bulk and raising bipolar membrane electrodialysis beneficial to further reduction bipolar membrane electrodialysis, therefore the present invention is anti-
The treatment effeciency for permeating concentrated water treatment method is high.
Claims (7)
1. a kind of reverse osmosis concentrated seawater treatment system, including cartridge filter (1), it is characterized in that the cartridge filter (1) is logical
Piping successively with high-pressure pump (2), nanofiltration membrane component (3), resin demineralizer (4), heater box (5), membrane distillation circulating pump (6) and
Hot liquor inlet (7-1) connection of membrane component (7)；The hot material liquid outlet (7-3) of membrane component (7) by pipeline with it is cold
But the cold liquor inlet (7-2) and raw material flow container (10) after device (8) connection again by pipeline respectively with membrane component (7) connect
Connect；Raw material flow container (10) is connected by pipeline with the negative pole of bipolar membrane electrodialysis membrane stack (18), and raw material flow container (10) passes through pipeline
The positive pole with material liquid circulating pump (14), bipolar membrane electrodialysis membrane stack (18) is connected successively；The cold burden liquid of membrane component (7) goes out
Mouth (7-4) is connected by pipeline with heater box (5)；The production water out (7-5) of membrane component (7) passes through pipeline and production water pot
(9) connect；Doughnut microporous hydrophobic membrane (7-6) and doughnut condenser pipe (7- are internally provided with membrane component (7)
7), the two ends of doughnut microporous hydrophobic membrane are connected with hot liquor inlet (7-1) and hot material liquid outlet (7-3) respectively；Hollow fibre
The two ends of dimension condenser pipe (7-7) are connected with cold liquor inlet (7-2) and cold material liquid outlet (7-4) respectively；Sour tank (11) passes through pipe
Road is connected with the negative pole of bipolar membrane electrodialysis membrane stack (18), and sour tank (11) is connected by pipeline with acid circulating pump (15)；Acid circulation
Pump (15) is connected with the positive pole and acid storage tank (21) of bipolar membrane electrodialysis membrane stack (18) respectively by pipeline；Alkali tank (12) passes through pipe
Road is connected with the negative pole of bipolar membrane electrodialysis membrane stack (18), and alkali tank (12) is connected by pipeline with alkali circulating pump (16), alkali circulation
Pump (16) is connected with the positive pole and alkali storage tank (20) of bipolar membrane electrodialysis membrane stack (18) respectively by pipeline；Pole water pot (13) passes through
Pipeline is connected with the negative pole of bipolar membrane electrodialysis membrane stack (18), pole water pot (13) by pipeline successively with pole water-circulating pump (17),
The positive pole connection of bipolar membrane electrodialysis membrane stack (18)；Alkali storage tank (20) adds pump (23), resin by pipeline with alkali and softened successively
Device (4) is connected；Acid storage tank (21) adds pump (22) by pipeline and acid and is connected；Acid add pump (22) by pipeline respectively with high pressure
The import of pump (2) and resin demineralizer (4) connection；The two ends of voltage-stabilized power supply (19) respectively with bipolar membrane electrodialysis membrane stack (18)
The negative pole electrical connection of positive pole and bipolar membrane electrodialysis membrane stack (18).
2. system according to claim 1, it is characterised in that the nanofiltration membrane component is high selectivity nanofiltration membrane component, institute
State model XCN, HYDRApro or DK of high selectivity nanofiltration membrane component.
3. system according to claim 1, it is characterized in that the resin in the resin demineralizer is the macropore for being resistant to high TDS
Weak acid positive resin, the model IRC83 or IRC76CRF of the macropore weak acid positive resin of the high TDS of tolerance.
4. system according to claim 1, it is characterized in that the both positive and negative polarity of the voltage-stabilized power supply (19) mutually switches.
5. a kind of reverse osmosis concentrated method of seawater treatment, it is characterized in that comprising the following steps：
(1) usage right requires a kind of one of 1-4 reverse osmosis concentrated seawater treatment system；
(2) reverse osmosis concentrated seawater is passed through into cartridge filter (1) to be filtered, removes graininess impurity, obtain pretreatment production water；
(3) production water will be pre-processed use that to add the acid for adjusting pH that pump (22) adds from acid be after 2~4, to pass through high-pressure pump (2) supercharging
To 1.5MPa~2.5MPa, be passed through nanofiltration membrane component (3) and carry out primary sofening treatment, remove 70%~90% hardness ions and
Organic matter of the molecular weight more than 200, obtains nanofiltration soft water；Nanofiltration soft water is passed through resin demineralizer (4) and carries out depth softening again
Processing, the hardness ions of removal more than 99% obtains resin soft water, and resin soft water is heated to 60 DEG C~90 DEG C into heater box,
Obtain hot material liquid；After the resin saturation of the resin demineralizer, startup acid adds pump (22) successively and alkali adds pump (23) and entered
Row resin regeneration；
(4) the doughnut microporous hydrophobic membrane (7-6) that hot material liquid is delivered to membrane component by membrane distillation circulating pump (6) is produced
Steam, produces the hot material liquid after steam and is cooled to 20 DEG C~30 DEG C by cooler (8), the feed liquid after cooling is divided to two strands, one
Doughnut condenser pipe (7-7) recovered steam latent heat of membrane component is back to as cold burden liquid, while producing fresh water, fresh water
Production water pot (9) is passed through to collect；Cold burden liquid after recovered steam latent heat is delivered to heater box (5) and carries out reheating, circulates according to this；
After it is 15%~25% that the feed liquid of heater box, which is concentrated into mass concentration, another stock is delivered to raw material flow container (10), obtained dense
Feed liquid；
(5) material liquid circulating pump (14), acid circulating pump (15), alkali circulating pump (16) and pole water-circulating pump (17) are opened successively, point
The dense feed liquid, acid solution, alkali lye, pole water are not delivered to bipolar membrane electrodialysis membrane stack positive pole, after after stability of flow, voltage stabilizing is opened
Power supply (19), regulation to bipolar membrane electrodialysis membrane stack operation electric current density 20mA/cm2~50mA/cm2, bipolar membrane electrodialysis membrane stack
Produce soda acid；
After the acid solution mass concentration of sour tank reaches 5%~12%, acid storage tank (21) is delivered to by acid circulating pump (15)；Work as alkali
After the alkali lye mass concentration of tank reaches 5%~12%%, acid storage tank (20) is delivered to by alkali circulating pump (16).
6. method according to claim 5, it is characterised in that the coolant of cooler (8) for nanofiltration membrane component concentrated water,
Original reverse osmosis concentrated seawater or seawater.
7. method according to claim 5, it is characterised in that the initial acid solution in sour tank (11) is the quality prepared in advance
Concentration is that the initial alkali lye in 0.2%~0.5% aqueous hydrochloric acid solution, alkali tank (12) is that the mass concentration prepared in advance is
Pole water in 0.2%~0.5% sodium hydrate aqueous solution, pole water pot is the sulphur that the mass concentration prepared in advance is 1%~3%
Acid sodium aqueous solution or potassium sulfate solution.
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| CN108217620A (en) * | 2018-01-06 | 2018-06-29 | 天津大学 | A kind of method for using sea water as magnesium source processing anaerobic fermented liquid and preparing guanite |
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| CN111362480A (en) * | 2020-04-03 | 2020-07-03 | 中煤能源研究院有限责任公司 | Method for treating reverse osmosis strong brine |
| CN111818988A (en) * | 2018-02-27 | 2020-10-23 | 懿华水处理技术有限责任公司 | Adjusting process stream composition for improved cell performance |
| CN112777866A (en) * | 2021-01-06 | 2021-05-11 | 杭州上拓环境科技股份有限公司 | Seawater zero-emission treatment system and treatment method |
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| US11502323B1 (en) | 2022-05-09 | 2022-11-15 | Rahul S Nana | Reverse electrodialysis cell and methods of use thereof |
| US11563229B1 (en) | 2022-05-09 | 2023-01-24 | Rahul S Nana | Reverse electrodialysis cell with heat pump |
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