CN108059213A - The combination nanofiltration of high-recovery and high sulfate radical rejection divides salt technique and system - Google Patents
The combination nanofiltration of high-recovery and high sulfate radical rejection divides salt technique and system Download PDFInfo
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- CN108059213A CN108059213A CN201710865775.9A CN201710865775A CN108059213A CN 108059213 A CN108059213 A CN 108059213A CN 201710865775 A CN201710865775 A CN 201710865775A CN 108059213 A CN108059213 A CN 108059213A
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- 238000001728 nano-filtration Methods 0.000 title claims abstract description 139
- 150000003839 salts Chemical class 0.000 title claims abstract description 50
- 238000011084 recovery Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 107
- 238000004519 manufacturing process Methods 0.000 claims abstract description 34
- 239000012528 membrane Substances 0.000 claims abstract description 19
- 241000370738 Chlorion Species 0.000 claims abstract description 13
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 26
- 239000002351 wastewater Substances 0.000 claims description 14
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 4
- 238000001471 micro-filtration Methods 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- 239000012286 potassium permanganate Substances 0.000 claims description 4
- 238000000108 ultra-filtration Methods 0.000 claims description 4
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 3
- 239000003456 ion exchange resin Substances 0.000 claims description 3
- 229920003303 ion-exchange polymer Polymers 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 abstract description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 abstract description 12
- 239000003245 coal Substances 0.000 abstract description 12
- 238000002425 crystallisation Methods 0.000 abstract description 11
- 230000008025 crystallization Effects 0.000 abstract description 11
- 238000005516 engineering process Methods 0.000 abstract description 10
- 239000013078 crystal Substances 0.000 abstract description 8
- 230000008020 evaporation Effects 0.000 abstract description 7
- 238000001704 evaporation Methods 0.000 abstract description 7
- 239000000126 substance Substances 0.000 abstract description 7
- 239000010842 industrial wastewater Substances 0.000 abstract description 6
- 239000011780 sodium chloride Substances 0.000 abstract description 6
- 229910052938 sodium sulfate Inorganic materials 0.000 abstract description 6
- 235000011152 sodium sulphate Nutrition 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 5
- 238000004065 wastewater treatment Methods 0.000 abstract description 5
- 230000009467 reduction Effects 0.000 abstract description 3
- -1 sulfate radical Chemical class 0.000 description 14
- 150000002500 ions Chemical class 0.000 description 8
- 238000012360 testing method Methods 0.000 description 5
- PALNZFJYSCMLBK-UHFFFAOYSA-K magnesium;potassium;trichloride;hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-].[Cl-].[K+] PALNZFJYSCMLBK-UHFFFAOYSA-K 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- 238000010850 salt effect Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229920001429 chelating resin Polymers 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009881 electrostatic interaction Effects 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Nanotechnology (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
A kind of combination nanofiltration the invention discloses high-recovery and high sulfate radical rejection divides salt technique and system, and system includes nanofiltration system A, nanofiltration system B, nanofiltration system C, production pond and concentrated water pond.The advantage of the invention is that, the permutation and combination for dividing unique design inside salt system by nanofiltration is handled, the rate of recovery of nanofiltration system entirety and sulfate radical rejection can be improved simultaneously, the rate of recovery ＞ 85% of whole nanofiltration system, sulfate radical rejection ＞ 99%, rejection to organics rate ＞ 90%, chlorion rejection ＜ 5%；NF membrane used is common Commercial nanofiltration membranes in nanofiltration system, greatly reduces the high saliferous Industrial Wastewater Treatment cost of coal chemical industry and technology requirement；Sodium chloride and sodium sulphate can be completely separated, system stable effluent quality, water resistant amount, variation water quality are strong, ensure its subsequent evaporation and crystallization system can Effec-tive Function, effectively improve crystallization purity salt, reduction divides salt difficulty, ensures crystal salt quality and yield.
Description
Technical field：
The present invention relates to field of industrial waste water treatment, the combination of more particularly to a kind of high-recovery and high sulfate radical rejection
Nanofiltration divides salt technique and system.
Background technology：
With the quickening of national omnibearing opening to the outside world paces and the implementation of strategy to develop western regions, coal liquifaction, coal alkene
A batch coal chemical technology key technology such as hydrocarbon, ammonia from coal, natural gas from coal makes a breakthrough.And Coal Chemical Engineering Project has water consumption
The features such as big and wastewater discharge is big, salt content is high, and China's coal chemical industry is concentrated mainly on the area of northwest water resources shortage, because
The problems such as this water scarcity, water pollution are serious, environmental capacity of water is extremely low seriously restricts the development of coal chemical industry.In addition at present
The problem of environmental protection policy and demand, how Industrial Wastewater Treatment especially coal chemical industrial waste water is handled, is increasingly prominent.
Modern Coal-based Chemical project mostly using waste water zero emission technology, cracks industry development and water resource and environment contradiction,
The technology mainly integrates links in Industrial Wastewater Treatment, and the waste water generated in production process, sewage are passed through
Reuse again after advanced treating to reduce the dosage of water resource and improve the recycling efficiency of water resource to greatest extent, reaches
To the purpose of " water-saving, emission reduction " and Industrial Wastewater Treatment future thrust.In recent years, coal chemical industry high slat-containing wastewater divides salt
Zero-discharge technology is quickly grown, and achieves certain achievement.And conventional high slat-containing wastewater divides salt method to use nanofiltration system more
System, the core component of nanofiltration system is NF membrane, and electrostatic interaction is formed between NF membrane and electrolyte ion, ionic electrolyte salt
Charge density is different, causes film variant to the rejection of ion, in the multicomponent system containing different valence state ion so that film
Different to the selectivity of different ions, different ions are also differed by the ratio of film.Monovalence salt ion can by and
The both sides of film are relatively evenly distributed in, 99% divalent salt ion and most of organic matter are blocked in the concentrated water side of film.Utilize nanofiltration
The film characteristic different to the rejection of monovalent salt with divalent salts, with reference to evaporation and crystallization system, that realizes high slat-containing wastewater divides salt zero
Discharge.
And from the point of view of practical operation situation, conventional nanofiltration point salt system has the following problems：1st, conventional nanofiltration divides salt system
The rate of recovery and rejection be a kind of shifting relation, the water rate of recovery of conventional nanofiltration membrane is about 70% or so, still
If designing intermediate booster pump, the rate of recovery of water can accordingly increase, and supercharging is bigger, and the rate of recovery is higher；But in pressurization,
As pressure increases, part divalent ion and organic matter can be caused to be forced into production water side so that the rejection of NF membrane declines,
NF membrane is 95%-99% to bivalent ions rejection, and the rejection of supercharging recycling NF membrane is remarkably decreased, such as medium design
Booster pump, the rate of recovery of water can be accordingly increased between 75%-80%, but rejection can drop to less than 90%；2nd, it is conventional
Nanofiltration point salt system needs high pressure nanofiltration and specific NF membrane, and service requirement is high, of high cost；3rd, conventional nanofiltration point salt system divides salt
It being not thorough, nanofiltration concentrated water is sodium chloride and sodium sulphate mixed solution, once conventional nanofiltration divides the amount of inlet water or water quality of salt system
It fluctuates, treatment effect is decreased obviously, and effluent quality is unstable, and evaporation and crystallization system operating conditions thereafter are complicated, finally
Cause nanofiltration-evaporative crystallization combined system that salt is divided to be not thorough, crystal salt quality is low, carnallite yield is big.
The content of the invention：
First of the present invention is designed to provide a kind of height that can improve the rate of recovery and sulfate ion rejection simultaneously
The combination nanofiltration of the rate of recovery and high sulfate radical rejection divides salt technique.
Second object of the present invention be to provide a kind of rate of recovery is high, sulfate ion rejection is high, operating cost is low,
The combination nanofiltration of the high-recovery and high sulfate radical rejection that divide salt effect good divides salt system.
First purpose of the present invention is implemented by following technical solution, and the combination of high-recovery and high sulfate radical rejection is received
Filter divides salt technique, pretreatment high-salt wastewater is delivered in nanofiltration system A, the production water of the nanofiltration system A is delivered to nanofiltration system
It unites in B, the concentrated water of the nanofiltration system A is delivered in nanofiltration system C, and the production water of the nanofiltration system B is delivered in production pond,
The concentrated water of the nanofiltration system B is delivered in nanofiltration system C, and the production water of the nanofiltration system C is back to the nanofiltration system B
In, the concentrated water of the nanofiltration system C is delivered in concentrated water pond.
Further, the water quality index of the pretreatment high-salt wastewater is as follows：TDS is 5000~40000mg/L, COD ＜
500mg/L, chlorine ion concentration be 3000~20000mg/L, sulfate ion concentration be 3000~15000mg/L, silica
Concentration ＜ 100mg/L.
Second object of the present invention is implemented by following technical solution, and the combination of high-recovery and high sulfate radical rejection is received
Filter divides salt system, includes nanofiltration system A, nanofiltration system B, nanofiltration system C, produces pond and concentrated water pond, the nanofiltration system A's
The production mouth of a river is connected with the water inlet of the nanofiltration system B, the water inlet of the concentrated water spout of the nanofiltration system A and the nanofiltration system C
Mouthful connection, the production mouth of a river of the nanofiltration system B with it is described produce pond water inlet connect, the concentrated water spout of the nanofiltration system B and
The water inlet connection of the nanofiltration system C, the production mouth of a river of the nanofiltration system C are connected with the water inlet of the nanofiltration system B, institute
The concentrated water spout for stating nanofiltration system C is connected with the water inlet in the concentrated water pond.
Further, include pretreatment system, the water outlet of the pretreatment system and the nanofiltration system A into
The mouth of a river connects.
Further, the pretreatment system includes potassium permanganate composites, more medium filter, ultrafiltration, amberlite
A kind of or arbitrarily several combination in fat, carbon dioxide cleaner, tube microfiltration membrane and advanced oxidation system.
Advantages of the present invention：1st, design is unique, realizes that reflux cycle is handled by internal system permutation and combination, can carry simultaneously
The rate of recovery of high nanofiltration system entirety and the rejection of sulfate ion, up to more than 85%, sulfate ion is cut the system rate of recovery
Staying rate, for rejection to organics rate up to more than 90%, chlorion rejection is less than -5% up to more than 99%；2nd, it is used in nanofiltration system
NF membrane is common Commercial nanofiltration membranes, greatly reduces operating cost and technology requirement, and operation energy consumption is low；3rd, high saliferous can be given up
Sodium chloride and sodium sulphate in water are completely separated, and production water side is mainly chlorion, and concentrated water side is mainly sulfate ion, and system goes out
Water quality stabilizing, water resistant amount, variation water quality are strong, ensure rear end evaporation and crystallization system can Effec-tive Function, effectively improve crystal salt
Purity reduces and subsequently divides salt difficulty, ensures crystal salt quality and yield, reduces carnallite yield.
Description of the drawings：
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the equipment connection diagram of embodiment 1.
Pretreatment system 1, potassium permanganate composites 11, more medium filter 12, ultrafiltration 13, ion exchange resin 14, except carbon
Device 15, tube microfiltration membrane 16 and advanced oxidation system 17, nanofiltration system A2, nanofiltration system B3, nanofiltration system C4 produce pond 5, dense
Pond 6.
Specific embodiment：
Embodiment 1：
As shown in Figure 1, the combination nanofiltration of high-recovery and high sulfate radical rejection divides salt system, including pretreatment system
1st, nanofiltration system A2, nanofiltration system B3, nanofiltration system C4, production pond 5 and concentrated water pond 6, pretreatment system 1 include what is be sequentially connected in series
Potassium permanganate composites 11, more medium filter 12, ultrafiltration 13, ion exchange resin 14, carbon dioxide cleaner 15, tube microfiltration membrane 16 and height
Grade oxidative system 17；The water outlet of the advanced oxidation system 17 of pretreatment system 1 is connected with the water inlet of nanofiltration system A2, nanofiltration
The production mouth of a river of system A2 is connected with the water inlet of nanofiltration system B3, the concentrated water spout of nanofiltration system A2 and the water inlet of nanofiltration system C4
Connection, the production mouth of a river of nanofiltration system B3 are connected with producing the water inlet in pond 5, and the concentrated water spout of nanofiltration system B3 is with nanofiltration system C4's
Water inlet connects, and the production mouth of a river of nanofiltration system C4 connects with the water inlet of nanofiltration system B3, the concentrated water spout of nanofiltration system C4 with it is dense
The water inlet connection in pond 6.
NF membrane used is common Commercial nanofiltration membranes in nanofiltration system A2, nanofiltration system B3, nanofiltration system C4, greatly
Reduce operating cost and technology requirement；Pressurization pump operation need not be added between nanofiltration system A2, nanofiltration system B3, nanofiltration system C4
Low energy consumption.Design is unique, realizes that reflux cycle is handled by internal system permutation and combination, can improve nanofiltration system entirety simultaneously
The rejection of the rate of recovery and sulfate ion, up to more than 85%, sulfate ion rejection has the system rate of recovery up to more than 99%
For machine object rejection up to more than 90%, chlorion rejection is less than -5%；It can be thorough by the sodium chloride in high slat-containing wastewater and sodium sulphate
Bottom separates, and production water side is mainly chlorion, and concentrated water side is mainly sulfate ion, system stable effluent quality, water resistant amount, water quality
Fluctuation is strong, ensure rear end evaporation and crystallization system can Effec-tive Function, effectively improve crystallization purity salt, reduction subsequently divides salt difficulty,
Ensure crystal salt quality and yield, reduce carnallite yield.
Embodiment 2：
The high-salt wastewater nanofiltration carried out using embodiment 1 divides salt technique, and the water quality index for pre-processing high-salt wastewater is as follows：
TDS is 19304mg/L, COD 110mg/L, chlorine ion concentration 4971mg/L, sulfate ion concentration 7271mg/L, two
Silica concentration is 32mg/L, flow 100m3/h；Pretreatment high-salt wastewater is delivered in nanofiltration system A2 and carries out just fraction
Salt, the rate of recovery of nanofiltration system A2 is 70%, and sulfate ion rejection is 96%, i.e., most of sulfate radical is trapped within concentrated water
It surveys, minute quantity penetrates into production water and surveys；The production water of nanofiltration system A2 is delivered in nanofiltration system B3, is carried out again in nanofiltration system B3
It is secondary to divide salt；The rate of recovery of nanofiltration system B3 is 80%, and sulfate ion rejection is 97%, and the production water of nanofiltration system B3 is system
Total yield water.System overall recovery is 85%, and the production water of nanofiltration system B3 is delivered in production pond 5.
Nanofiltration system A2, the concentrated water of nanofiltration system B3, which are delivered in nanofiltration system C4, carries out a point salt treatment.Nanofiltration system C4
The rate of recovery for 70%, sulfate ion rejection is 96%, and the production water of nanofiltration system C4 is back in nanofiltration system B3, nanofiltration
The concentrated water of system C4 is the total concentrated water of system.System sulfate ion rejection is 99.05%, and the concentrated water of nanofiltration system C4 is delivered to
In concentrated water pond 6.
Embodiment 2 is carried out using embodiment 1, the rate of recovery is as shown in table 1, and sulfate ion rejection is as shown in table 2, point
Salt effect is as shown in table 3.
The 1 system rate of recovery of table
2 system sulfate ion rejection of table
3 system of table divides salt effect
From table 1 to table 3, the reflux cycle to be formed processing is combined by internal arrangement, nanofiltration system can be improved simultaneously
The whole rate of recovery and sulfate ion rejection, the rate of recovery is up to more than 85%, and sulfate ion rejection is up to more than 99%；It can
Sodium chloride and sodium sulphate are completely separated, production water side is mainly chlorion, and concentrated water side is mainly sulfate ion, system water outlet water
Matter is stablized, and water resistant amount, variation water quality are strong, ensure evaporation and crystallization system thereafter can Effec-tive Function, it is pure to effectively improve crystal salt
Degree reduces and subsequently divides salt difficulty, ensures crystal salt quality and yield.
Embodiment 3：
Using the present invention as test group, one section of nanofiltration system of two-stage is control group I, and two sections of nanofiltration systems of level-one are control group II
Carry out check experiment.Control group I includes two sets of nanofiltration systems, and the production water of higher level's nanofiltration system enters subordinate's nanofiltration system；Control
Group II includes two sets of nanofiltration systems, and the concentrated water of higher level's nanofiltration system enters subordinate's nanofiltration system.To test group, control group I and right
It is detected according to the rate of recovery, sulfate ion rejection and the rejection to organics rate of group II, testing result is as shown in table 4.
4 test group of table, the rate of recovery of control group I and control group II, sulfate ion rejection and rejection to organics rate
Testing result
As shown in Table 4, control group I carries out multistage nanofiltration by producing water to nanofiltration, although the sulfate radical of system can be improved
Ion rejection rate, but the rate of recovery is substantially reduced；Control group II by the progress multistage nanofiltration of nanofiltration concentrated water, being although can improve
The rate of recovery of system, but sulfate ion rejection is substantially reduced again；Simple multistage or multi-stage series are carried out to nanofiltration system
Combination can not make the two while improve；And the present invention is formed back by unique design by internal system permutation and combination
Circular treatment is flowed, can improve the rate of recovery of system entirety and sulfate ion rejection simultaneously, the rate of recovery is up to more than 85%, sulfuric acid
Radical ion rejection is up to more than 99%, and for rejection to organics rate up to more than 90%, chlorion rejection is less than -5%.Chlorion retains
There is negative value in rate, this is mainly due to the salt content always intake it is higher, sodium ion transmitance increase, the transmitance of chlorion
More than the transmitance of sulfate ion, received to maintain the charge balance of NF membrane both sides, it is necessary to be penetrated by more chlorions
Filter membrane, therefore there is the situation that chlorion rejection is negative value.
Simultaneously as sodium chloride and sodium sulphate can be completely separated by system, production water side is mainly chlorion, and concentrated water side is main
For sulfate ion, system stable effluent quality, water resistant amount, variation water quality are strong, ensure that evaporation and crystallization system thereafter can be high
Effect operation, effectively improves crystallization purity salt, reduces and subsequently divides salt difficulty, ensures crystal salt quality and yield.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modifications, equivalent replacements and improvements are made should all be included in the protection scope of the present invention god.
Claims (5)
1. the combination nanofiltration of high-recovery and high sulfate radical rejection divides salt technique, which is characterized in that will pre-process high-salt wastewater
It is delivered in nanofiltration system A, the production water of the nanofiltration system A is delivered in nanofiltration system B, and the concentrated water of the nanofiltration system A is defeated
It send into nanofiltration system C, the production water of the nanofiltration system B is delivered in production pond, and the concentrated water of the nanofiltration system B, which is delivered to, to be received
In filter system C, the production water of the nanofiltration system C is back in the nanofiltration system B, and the concentrated water of the nanofiltration system C is delivered to
In concentrated water pond.
2. the combination nanofiltration of high-recovery according to claim 1 and high sulfate radical rejection divides salt technique, feature exists
In the water quality index of the pretreatment high-salt wastewater is as follows：TDS be 5000~40000mg/L, COD ＜ 500mg/L, chlorion
Concentration is 3000~20000mg/L, and sulfate ion concentration is 3000~15000mg/L, silica concentration ＜ 100mg/L.
3. the combination nanofiltration of high-recovery and high sulfate radical rejection divides salt system, which is characterized in that it include nanofiltration system A,
Nanofiltration system B, nanofiltration system C, production pond and concentrated water pond, the production mouth of a river of the nanofiltration system A and the water inlet of the nanofiltration system B
Mouth connection, the concentrated water spout of the nanofiltration system A are connected with the water inlet of the nanofiltration system C, the production mouth of a river of the nanofiltration system B
It is connected with the water inlet in the production pond, the concentrated water spout of the nanofiltration system B is connected with the water inlet of the nanofiltration system C, institute
The production mouth of a river for stating nanofiltration system C is connected with the water inlet of the nanofiltration system B, the concentrated water spout of the nanofiltration system C with it is described dense
The water inlet connection in pond.
4. the combination nanofiltration of high-recovery according to claim 3 and high sulfate radical rejection divides salt system, feature exists
In including pretreatment system, the water outlet of the pretreatment system is connected with the water inlet of the nanofiltration system A.
5. the combination nanofiltration of high-recovery according to claim 4 and high sulfate radical rejection divides salt system, feature exists
In the pretreatment system includes potassium permanganate composites, more medium filter, ultrafiltration, ion exchange resin, carbon dioxide cleaner, tubular type
A kind of or arbitrarily several combination in microfiltration membranes and advanced oxidation system.
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