CN205676303U - A kind of sodium chloride-containing and the high-salt wastewater processing equipment for recycling of sodium sulphate - Google Patents
A kind of sodium chloride-containing and the high-salt wastewater processing equipment for recycling of sodium sulphate Download PDFInfo
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- CN205676303U CN205676303U CN201620338006.4U CN201620338006U CN205676303U CN 205676303 U CN205676303 U CN 205676303U CN 201620338006 U CN201620338006 U CN 201620338006U CN 205676303 U CN205676303 U CN 205676303U
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Abstract
The utility model discloses the high-salt wastewater processing equipment for recycling of a kind of sodium chloride-containing and sodium sulphate, capital equipment includes the selective electric dialyzator of nanofiltration device, the first reverse osmosis unit, ion, the second reverse osmosis unit, secondary nanofiltration device, crystallization apparatus and evaporated crystallization device.One time nanofiltration device is connected with ion selectivity electric dialyzator, and this nanofiltration device is also connected with the first reverse osmosis unit.First reverse osmosis unit electric dialyzator selective with ion is connected.The selective electric dialyzator of ion and the second reverse osmosis unit connect.Second reverse osmosis unit is connected with crystallization apparatus.The selective electric dialyzator of ion is connected with secondary nanofiltration device.Secondary nanofiltration device is connected with a nanofiltration device, and this secondary nanofiltration device is also connected with evaporated crystallization device.All selective with the described ion electric dialyzator of crystallization apparatus and evaporated crystallization device is connected.The utility model can obtain I class industrial anhydrous sodium sulfate and one-level refining industrial salt, it is achieved utilization of wastewater resource.
Description
Technical field
The utility model belongs to field of industrial waste water treatment, is specifically related to the high-salt wastewater of a kind of sodium chloride-containing and sodium sulphate
Processing equipment for recycling.
Background technology
In Coal Chemical Industry, metallurgy, printing and dyeing, some enterprises of pharmaceutical industry, the height of a large amount of sodium chloride-containing and sodium sulphate can be produced
Salt waste water.At present, although a lot of enterprises are actively equipped with evaporated crystallization device and process this kind of high-salt wastewater, but are essentially all directly
Evaporative crystallization obtains carnallite, not only can not realize recycling, can be considered solid waste, even dangerous waste on the contrary
Thing, needs further to dispose.
Energy-saving and emission-reduction, environmental protection historical background under, the zero-emission of high-salt wastewater and recycling treatment be high salt give up
The inexorable trend of water harnessing.ZL200610114043.8 proposes a kind of from Na2SO4-NaCl-H2In O system produce sodium sulphate and
The joint production process of salt and salt-cake of the circulating and evaporating crystallization of sodium chloride, but this technique exists, and internal circulating load is big, energy consumption is high, control is difficult, particularly
To problems such as Industrial Wastewater Treatment stability are not high.ZL201110461060.X discloses a kind of group technology based on NF membrane
Process the sewage of sulfur acid sodium and sodium chloride, but its former water needs to be diluted with water, and sodium chloride content is contained higher than sodium sulphate
Amount, or the high-salt wastewater that two kinds of salt contents are suitable, use the pure of the sodium chloride that its method announced obtains and sodium sulphate product
Degree and yield can be subject to certain restrictions.
Utility model content
In view of the deficiencies in the prior art, the purpose of this utility model be to provide a kind of energy-conservation, stable sodium chloride-containing with
The high-salt wastewater processing equipment for recycling of sodium sulphate, can realize high-salinity wastewater zero-emission by this device, and can obtain height
Purity, the sodium chloride product of high yield and sodium sulphate product.
For achieving the above object, the technical scheme that the utility model is used is as follows.
A kind of sodium chloride-containing and the high-salt wastewater processing equipment for recycling of sodium sulphate, capital equipment includes that a nanofiltration fills
Put, the selective electric dialyzator of the first reverse osmosis unit, ion, the second reverse osmosis unit, secondary nanofiltration device, crystallization apparatus and steaming
Send out crystallization apparatus；A described nanofiltration device is provided with the entrance of sodium chloride-containing and sodium sulphate high-salt wastewater；Described nanofiltration dress
The freshwater room entrance of the trapped fluid outlet electric dialyzator selective with described ion put is connected, the permeate of this nanofiltration device
Outlet is connected with the entrance of described first reverse osmosis unit；The concentrated solution outlet of described first reverse osmosis unit selects with described ion
The dense hydroecium entrance of selecting property electric dialyzator connects；The water outlet of the selective electric dialyzator of described ion and described second counter-infiltration
The entrance of device connects；The concentrated solution outlet of described second reverse osmosis unit is connected with described crystallization apparatus entrance；Described crystallization
Device crystal exports output sulfate crystal；The dense water out of the selective electric dialyzator of described ion and described secondary nanofiltration device
Entrance connect；The trapped fluid outlet of described secondary nanofiltration device is connected with a described nanofiltration device entrance, this secondary nanofiltration
The permeate outlet of device is connected with described evaporated crystallization device entrance；Described evaporated crystallization device crystal exports output sodium chloride
Crystallization；The mother liquor outlet of the mother liquor outlet of described crystallization apparatus and described evaporated crystallization device all selective electric osmoses with described ion
The freshwater room entrance of parser connects.
Further, a described nanofiltration device entrance the salt content of high-salt wastewater be 1.0% ~ 5.0%, COD is less than
50mg/L, hardness is less than 20mg/L.
Further, the salt rejection rate to sodium sulphate for the described nanofiltration device is more than 95%, is less than the salt rejection rate of sodium chloride
60%。
Further, the selective electric dialyzator of described ion uses Monovalent selectivity anion-exchange membrane as cavity block, can
Pass through monovalent anion with selectivity.
Further, the chlorine ion concentration of the outlet fresh water of the selective electric dialyzator of described ion is 0 ~ 1000mg/L.
Further, the mass concentration of sodium chloride and sodium sulphate in the permeate that described secondary nanofiltration device permeate exports
Ratio be more than 10.
Further, described first reverse osmosis unit or the second reverse osmosis unit are brackish water desalination reverse osmosis unit, sea
The combination of one or more in water desalination reverse osmosis unit, disc tube reverse osmosis (dt-ro) device.
Further, the salt content of the concentrate of described second reverse osmosis unit concentrated solution outlet is 5% ~ 10%.
Further, described sulfate crystal system is evaporation and crystallization system or freezing and crystallizing system.
Further, the salt content of the permeate of described secondary nanofiltration device permeate outlet is 5% ~ 15%.
Further, described sodium chloride evaporation and crystallization system be single effect evaporation crystal system, multiple-effect evaporation crystal system,
MVR evaporation and crystallization system or TVR evaporation and crystallization system.
Further, permeate, the second reverse osmosis unit permeate of described first reverse osmosis unit permeate outlet goes out
The permeate of mouth and the recycling condensing water of evaporation and crystallization system condensation-water drain.
Owing to have employed technique scheme, the beneficial effects of the utility model are as follows.
Sodium chloride-containing enters a nanofiltration device with the high-salt wastewater of sodium sulphate, is limited by NF membrane salt rejection rate, once
The trapped fluid of nanofiltration still has the sodium chloride of certain content, and the permeate of a nanofiltration still has the sodium sulphate of certain content.This practicality
Novel by the selective electric dialyzator of monovalention, can make the light room of entrance a nanofiltration trapped fluid in sodium chloride move to
Side, dense room (and sodium sulphate is retained in side, light room), both can improve the yield of sodium chloride product, also can improve sulphur simultaneously
The purity of acid sodium product；By secondary nanofiltration, the sodium sulphate in the permeate of a nanofiltration can be retained further, thus improving
Improve the yield of sodium sulphate product while sodium chloride product purity.The utility model to different sal prunellas than high-salt wastewater all have
Well adapting to property and stability.I class industrial anhydrous sodium sulfate and one-level highly industry can be obtained by the utility model
Salt, it is achieved the recycling of waste water.
The utility model, can by the first counter-infiltration, the second counter-infiltration and monovalention selectively electrodialytic concentration
It is substantially reduced the scale of sulfate crystal system and sodium chloride evaporation and crystallization system, the joint production process of salt and salt-cake with circulating and evaporating crystallization
Comparing, reduced investment, energy consumption are low, run more reliable.
Brief description
Fig. 1 is showing according to a kind of sodium chloride-containing of the present utility model and the high-salt wastewater processing equipment for recycling of sodium sulphate
It is intended to.
Detailed description of the invention
With embodiment, the utility model is described in further detail below in conjunction with the accompanying drawings.
As it is shown in figure 1, a kind of sodium chloride-containing and the high-salt wastewater processing equipment for recycling of sodium sulphate, specifically include following step
Suddenly.
1. salt content is 1.0% ~ 5.0%, and COD is less than 50mg/L, and the high-salt wastewater less than 20mg/L for the hardness enters once to be received
Filter device, obtains trapped fluid and the permeate of a nanofiltration；The salt rejection rate to sodium sulphate for the described nanofiltration device is more than 95%,
60% is less than to the salt rejection rate of sodium chloride.
2. the trapped fluid of a nanofiltration enters the light room of the selective electric dialyzator of monovalention, the permeate of a nanofiltration
The dense room of the selective electric dialyzator of monovalention is entered through the first reverse osmosis unit after concentrating；Described first reverse osmosis unit is hardship
The combination of one or more in desalination reverse osmosis unit, seawater desalination reverse osmosis device, disc tube reverse osmosis (dt-ro) device；Institute
State the permeate of the first reverse osmosis unit as recycle-water；The selective electric dialyzator of described monovalention uses Monovalent selectivity cloudy
Amberplex, as cavity block, can selectively pass through monovalent anion.Under applying direct current electric field effect, electric dialyzator occurs
Counter ion migrates, and the chlorion in light room and sulfate radical are simultaneously when anode migrates, due to Monovalent selectivity anion-exchange membrane
Have higher repulsive interaction to make sulfate radical cannot pass through cavity block to sulfate radical, and Monovalent selectivity anion-exchange membrane to chlorine from
The repulsive force of son is relatively small, so chlorion can migrate across female die surface so that the chlorine ion concentration fall of outlet fresh water
Low to 0 ~ 1000mg/L, and the sulfate concentration exporting fresh water is held essentially constant.
3. the outlet fresh water of the selective electric dialyzator of monovalention enters the second reverse osmosis unit；Described second counter-infiltration
Device is brackish water desalination reverse osmosis unit, the one in seawater desalination reverse osmosis device or a combination thereof；Described second counter-infiltration
The permeate of device is as recycle-water.By the concentration of the second reverse osmosis unit, the salt content of the concentrate of the second counter-infiltration reaches
To 5% ~ 10%.
4. the dense water of outlet of the selective electric dialyzator of monovalention enters secondary nanofiltration device；By secondary nanofiltration effect,
Retain the sodium sulphate in the dense water of outlet of the selective electric dialyzator of monovalention further, make chlorination in the permeate of secondary nanofiltration
Sodium is more than 10 with the ratio of the mass concentration of sodium sulphate；Simultaneously because above-mentioned first reverse osmosis unit and monovalention selectively electricity
The concentration of dialyzer, the salt content of the permeate of secondary nanofiltration reaches 5% ~ 15%；The trapped fluid of secondary nanofiltration returns a nanofiltration
Device process.
5. the concentrate of the second counter-infiltration obtains sodium sulphate product through sulfate crystal system；The permeate of secondary nanofiltration
Obtaining sodium chloride product through sodium chloride evaporation and crystallization system, the condensed water of evaporative crystallization is as recycle-water；Sulfate crystal system
And the light room of the selective electric dialyzator of crystalline mother solution return monovalention of sodium chloride evaporation and crystallization system is processed further, thus
The purity of raising sodium sulphate product and sodium chloride product and yield.Described sulfate crystal system is evaporation and crystallization system or freezing
Crystal system；Described evaporation and crystallization system is single effect evaporation crystal system, multiple-effect evaporation crystal system, MVR evaporation and crystallization system
Or TVR evaporation and crystallization system, including evaporimeter and crystallizer；Described evaporimeter is that falling film evaporator, climbing film evaporator, pressure follow
The combination of one or more in ring evaporimeter；Described crystallizer is Oslo crystallizer, DTB crystallizer, DP crystallizer or above-mentioned
The mutation of pattern, crystallizer is provided with elutriating cylinder；Sodium sulphate product is scrubbed with sodium chloride product and is dried process, respectively reaches I
Class industrial anhydrous sodium sulfate and the quality standard of one-level refining industrial salt.
Processing means of the present utility model is further described below as a example by the high-salt wastewater of certain factory, of the present utility model
Protection domain is not limited to following specific embodiment.
The high-salt wastewater that certain factory produces water mainly contains Na2SO4With NaCl, wherein NaCl concentration is 3100mg/L, Na2SO4
Concentration is 4600mg/L, and COD is 92mg/L, and hardness is 120mg/L.High-salt wastewater is before entering a nanofiltration device, first logical
Cross ozone-oxidizing device, softening plant carries out pre-processing and carries out pre-dense by pollution-resistant brackish water desalination reverse osmosis unit
Contracting, makes salt content reach 2.1%, and COD is reduced to 12mg/L, and hardness is reduced to 6mg/L.High-salt wastewater passes through a nanofiltration device
Obtain rich in Na2SO4Trapped fluid and the permeate rich in NaCl, the wherein Na of trapped fluid2SO4Concentration is 28000mg/L,
NaCl concentration is 4700mg/L；The Na of permeate2SO4Concentration is 980mg/L, and NaCl concentration is 8800mg/L.Cutting of nanofiltration
Stay liquid to enter the light room of the selective electric dialyzator of monovalention, the permeate of a nanofiltration through seawater desalination reverse osmosis device and
Disc tube reverse osmosis (dt-ro) device enters the dense room of the selective electric dialyzator of monovalention after concentrating 10 times.Through monovalention selectively electricity
Dialyzer chloride ion transport effect, the NaCl concentration of outlet fresh water is reduced to 520mg/L.Outlet fresh water enters desalinization reverse osmosis
Saturating device concentrates, and concentrate salt content reaches 8.5%, is subsequently sent to sodium sulphate freezing and crystallizing system, crystallized, centrifugal point
From, washing, turn brilliant and be dried process after obtain sodium sulfate quality fraction more than I class less than 0.1% for the 99%th, the chloride mass fraction
Industrial anhydrous sodium sulfate.The NaCl concentration of the dense water of outlet of the selective electric dialyzator of monovalention is 115000mg/L, Na2SO4Dense
Degree is 16500mg/L, retains Na further through secondary nanofiltration2SO4Rear permeate enters MVR falling film evaporator through heat exchange and carries out pre-
Concentrate, when in falling film evaporator, NaCl mass concentration delivers to MVR forced-circulation evaporation crystal system when reaching 20%, through further
Be concentrated by evaporation, crystallization and centrifugation, washing and being dried obtain after processing sodium chloride mass fraction more than the 99%th, sulfate radical from
The one-level refining industrial salt of protonatomic mass fraction ＜ 0.3%.
Claims (10)
1. the high-salt wastewater processing equipment for recycling of a sodium chloride-containing and sodium sulphate, it is characterised in that: capital equipment includes one
The selective electric dialyzator of secondary nanofiltration device, the first reverse osmosis unit, ion, the second reverse osmosis unit, secondary nanofiltration device, crystallization
Device and evaporated crystallization device；A described nanofiltration device is provided with the entrance of sodium chloride-containing and sodium sulphate high-salt wastewater；Described one
The freshwater room entrance of the trapped fluid outlet electric dialyzator selective with described ion of secondary nanofiltration device is connected, this nanofiltration device
Permeate outlet be connected with the entrance of described first reverse osmosis unit；The concentrated solution outlet of described first reverse osmosis unit and institute
The dense hydroecium entrance stating the selective electric dialyzator of ion connects；The water outlet of the selective electric dialyzator of described ion and described the
The entrance of two reverse osmosis units connects；The concentrated solution outlet of described second reverse osmosis unit is connected with described crystallization apparatus entrance；
Described crystallization apparatus crystal exports output sulfate crystal；The dense water out of the selective electric dialyzator of described ion and described secondary
The entrance of nanofiltration device connects；The trapped fluid outlet of described secondary nanofiltration device is connected with a described nanofiltration device entrance, should
The permeate outlet of secondary nanofiltration device is connected with described evaporated crystallization device entrance；The outlet of described evaporated crystallization device crystal is produced
Go out sodium chloride crystallization；The mother liquor outlet of the mother liquor outlet of described crystallization apparatus and described evaporated crystallization device all selects with described ion
The freshwater room entrance of selecting property electric dialyzator connects.
2. the high-salt wastewater processing equipment for recycling of a kind of sodium chloride-containing as claimed in claim 1 and sodium sulphate, its feature exists
In: the salt content of the high-salt wastewater of a described nanofiltration device entrance is 1.0% ~ 5.0%, and COD is less than 50mg/L, and hardness is less than
20mg/L。
3. the high-salt wastewater processing equipment for recycling of a kind of sodium chloride-containing as claimed in claim 1 and sodium sulphate, its feature exists
In: the salt rejection rate to sodium sulphate for the described nanofiltration device is more than 95%, is less than 60% to the salt rejection rate of sodium chloride.
4. the high-salt wastewater processing equipment for recycling of a kind of sodium chloride-containing as claimed in claim 1 and sodium sulphate, its feature exists
In: the selective electric dialyzator of described ion uses Monovalent selectivity anion-exchange membrane as cavity block, can be selectively by list
Valency anion.
5. the high-salt wastewater processing equipment for recycling of a kind of sodium chloride-containing as claimed in claim 1 and sodium sulphate, its feature exists
In: the chlorine ion concentration of the outlet fresh water of the selective electric dialyzator of described ion is 0 ~ 1000mg/L.
6. the high-salt wastewater processing equipment for recycling of a kind of sodium chloride-containing as claimed in claim 1 and sodium sulphate, its feature exists
In: in the permeate of described secondary nanofiltration device permeate outlet, sodium chloride and the ratio of the mass concentration of sodium sulphate are more than 10.
7. the high-salt wastewater processing equipment for recycling of a kind of sodium chloride-containing as claimed in claim 1 and sodium sulphate, its feature exists
In: described first reverse osmosis unit or the second reverse osmosis unit are brackish water desalination reverse osmosis unit, seawater desalination reverse osmosis dress
Put, the combination of one or more in disc tube reverse osmosis (dt-ro) device.
8. the high-salt wastewater processing equipment for recycling of a kind of sodium chloride-containing as claimed in claim 1 and sodium sulphate, its feature exists
In: the salt content of the concentrate of described second reverse osmosis unit concentrated solution outlet is 5% ~ 10%.
9. the high-salt wastewater processing equipment for recycling of a kind of sodium chloride-containing as claimed in claim 1 and sodium sulphate, its feature exists
In: the salt content of the permeate of described secondary nanofiltration device permeate outlet is 5% ~ 15%.
10. the high-salt wastewater processing equipment for recycling of a kind of sodium chloride-containing as claimed in claim 1 and sodium sulphate, its feature exists
In: described first reverse osmosis unit permeate outlet permeate, second reverse osmosis unit permeate outlet permeate and
The recycling condensing water of evaporation and crystallization system condensation-water drain.
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| CN107140771A (en) * | 2017-06-12 | 2017-09-08 | 西安西热水务环保有限公司 | A kind of salt separation of easy fouling waste water of high salt and concentration curing process system and method |
| CN109399845A (en) * | 2018-12-26 | 2019-03-01 | 兰州理工大学 | A kind of method of nanofiltration-freezing denitrating technique processing Metallurgical Waste Water |
| CN109502871A (en) * | 2019-01-08 | 2019-03-22 | 山东蓝然环境科技有限公司 | A kind of high-salinity wastewater zero-emission and divide salt resource utilization device |
| CN109824187A (en) * | 2017-11-23 | 2019-05-31 | 内蒙古久科康瑞环保科技有限公司 | It is a kind of multistage multistage nanofiltration divide salt treatment system and technique |
| WO2021036406A1 (en) * | 2019-08-28 | 2021-03-04 | Nanjing Bidun Environmental Protection Technology Co. | Zero liquid discharge systems and processes for high-salinity wastewater treatment |
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2016
- 2016-04-21 CN CN201620338006.4U patent/CN205676303U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107140771A (en) * | 2017-06-12 | 2017-09-08 | 西安西热水务环保有限公司 | A kind of salt separation of easy fouling waste water of high salt and concentration curing process system and method |
| CN109824187A (en) * | 2017-11-23 | 2019-05-31 | 内蒙古久科康瑞环保科技有限公司 | It is a kind of multistage multistage nanofiltration divide salt treatment system and technique |
| CN109824187B (en) * | 2017-11-23 | 2021-10-08 | 内蒙古久科康瑞环保科技有限公司 | Multistage nanofiltration salt separation treatment system and process |
| CN109399845A (en) * | 2018-12-26 | 2019-03-01 | 兰州理工大学 | A kind of method of nanofiltration-freezing denitrating technique processing Metallurgical Waste Water |
| CN109502871A (en) * | 2019-01-08 | 2019-03-22 | 山东蓝然环境科技有限公司 | A kind of high-salinity wastewater zero-emission and divide salt resource utilization device |
| WO2021036406A1 (en) * | 2019-08-28 | 2021-03-04 | Nanjing Bidun Environmental Protection Technology Co. | Zero liquid discharge systems and processes for high-salinity wastewater treatment |
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