CN105565573B - The device and method of desulfurization wastewater zero discharge treatment - Google Patents
The device and method of desulfurization wastewater zero discharge treatment Download PDFInfo
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- CN105565573B CN105565573B CN201610082163.8A CN201610082163A CN105565573B CN 105565573 B CN105565573 B CN 105565573B CN 201610082163 A CN201610082163 A CN 201610082163A CN 105565573 B CN105565573 B CN 105565573B
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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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
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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
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
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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
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The present invention provides a kind of device of desulfurization wastewater zero discharge treatment.It include: that a demagging removes weight pond group；It is connected to the deliming sedimentation basin group that the demagging removes weight pond group；It is connected to a nanofiltration system of the deliming sedimentation basin group, including sulfate concentrated water outlet and a villaumite water outlet, the sulfate concentrated water outlet is connected to by a concentrate recirculation pipeline with the deliming sedimentation basin group；The multi-stage reverse osmosis system being connected to the villaumite water outlet by a concentration transfer pipeline；With a crystallizing evaporator of a concentrated water outlet of the multi-stage reverse osmosis system.Processing method based on above-mentioned apparatus is provided simultaneously.Desulfurization wastewater can be made to meet the requirement of the membrane separation techniques such as RO, and operation and processing cost can be greatly lowered by pre-processing to desulfurization wastewater.
Description
Technical field
The present invention relates to environmental protection technical fields, and in particular to a kind of device of desulfurization wastewater zero discharge treatment and side
Method.
Background technique
Coal fired power generation occupies an important position in China's energy resource supply.For environment protection, China is most in recent years
Number power plant uses Limestone-gypsum Wet Flue Gas Desulfurization Process technology, to remove the sulfur dioxide in flue gas.Using aforementioned desulfurization technology
A large amount of desulfurization wastewater can be generated, the wet desulphurization waste component of coal-burning power plant is complicated, contains high concentration suspended matter, oversaturated
Sulphite, chloride ion, sulfate and various heavy.
Currently, desulfurization wastewater mainly uses chemical precipitation method to handle, part index number difficulty up to standard, even if after processing up to standard,
Due to the presence of sulfate and chloride a large amount of in waste water, it is discharged salt content and is still up to 2%~4%, be difficult to reuse, outside
It can also cause surface water and soil ecology to destroy after row, cause secondary pollution.Therefore, desulfurization wastewater zero discharge treatment technology is ground
Hair is increasingly taken seriously.
Evaporative crystallization method is current main desulfurization wastewater Zero-discharge treating process, and evaporative crystallization method have energy consumption it is high,
The easy fouling of the equipment disadvantage big with investment.Moreover, evaporative crystallization method processing desulfurization wastewater cost is too high, ton water process expense is universal
Reach 60 yuan or more；It, can be using membrane separation techniques such as RO (reverse osmosis) in some practice of construction in order to reduce processing cost
Minimizing processing is carried out to waste water first, the concentrated water that UF membrane generates is evaporated crystallization again, evaporation can be effectively reduced in this way
The processing load of crystallization simultaneously saves processing cost.But when using the membrane separation techniques such as RO, need in advance to carry out desulfurization wastewater
Stringent pretreatment, since calcium and magnesium concentration is high in waste water, calcium sulfate is in hypersaturated state, will cause softening pretreatment cost pole
It is high.In addition, the salt that evaporative crystallization generates is the mixed salt of sodium chloride and sodium sulphate, it is difficult to utilize, disposition is difficult.
Therefore, in order to avoid environmental pollution and recycling water resource, in view of desulfurization wastewater sofening treatment disadvantage at high cost and
Deficiency, the efficient desulfurization wastewater sofening treatment technology of exploiting economy are vital for Wet Flue Gas Desulfurization Technique field.
Summary of the invention
In view of the above-mentioned problems, the object of the present invention is to provide a kind of device and methods of desulfurization wastewater zero discharge treatment.Energy
Enough by pre-processing to desulfurization wastewater, desulfurization wastewater is set to meet the requirement of the membrane separation techniques such as RO, and can significantly drop
Low operation and processing cost.
In order to achieve the above object, the specific technical solution that the present invention takes is:
A kind of device of desulfurization wastewater concentration, comprising:
One demagging removes weight pond group；
It is connected to the deliming sedimentation basin group that the demagging removes weight pond group；
It is connected to a nanofiltration system of the deliming sedimentation basin group, including sulfate concentrated water outlet and a villaumite fresh water go out
Mouthful, the sulfate concentrated water outlet is connected to by a concentrate recirculation pipeline with the deliming sedimentation basin group；
The multi-stage reverse osmosis system being connected to the villaumite water outlet by a concentration transfer pipeline；
With a crystallizing evaporator of a concentrated water outlet of the multi-stage reverse osmosis system.
Further, it includes: that a demagging removes weight pond that the demagging, which removes weight pond group, is equipped with one first dosing pipe；With it is described
Demagging removes a primary sedimentation tank of weight pond connection, and bottom is equipped with one first spoil disposal pipeline.
Further, the deliming sedimentation basin group includes: a first deliming pond, one or the two deliming ponds and one being sequentially communicated
Secondary settling tank；First deliming pond described in the concentrate recirculation pipeline connection；One water inlet of the secondary settling tank and the nanofiltration system
Connection；The first deliming pond is equipped with one second dosing pipe；The secondary deliming pond is equipped with a third dosing pipe；It is described first
The bottom in secondary deliming pond, secondary deliming pond and secondary settling tank is connected to one second spoil disposal pipeline.
Further, a filter is equipped between the secondary settling tank and the water inlet.
Further, the multi-stage reverse osmosis system includes primary reverse osmosis system and two-stage reverse osmosis system；Described one
Grade counter-infiltration system uses ordinary RO membrane or seawater reverse osmosis membrane；The two-stage reverse osmosis system uses super-pressure reverse osmosis
Permeable membrane.
Zero emission treatment of desulfured waste water is carried out based on aforementioned device, comprising the following steps:
1) desulfurization wastewater enters demagging except weight pond group, and magnesium ion and heavy metal ion in desulfurization wastewater is made to generate hydroxide
Object precipitating；It obtains demagging and removes weight waste water；
2) demagging remove weight waste water enter deliming sedimentation basin group, make demagging remove weight waste water be reduced to calcium ion concentration in waste water
10mg/L is hereinafter, obtain mixed salt waste water；
3) mixed salt waste water enters nanofiltration system；Mixed salt waste water is separated into sulfate concentrated water and villaumite fresh water；
4) sulfate concentrated water is at least partly back to deliming sedimentation basin group；Villaumite fresh water enters multi-stage reverse osmosis system, obtains
To distillation condensed water and villaumite concentrated water；Villaumite concentrated water enters crystallizing evaporator, obtains evaporation condensed water and can reuse salt.
Further, step 1) desulfurization wastewater enters demagging except weight pond group, makes the magnesium ion and heavy metal in desulfurization wastewater
Ion generates hydroxide precipitating
1-1) desulfurization wastewater enters demagging except weight pond, removes in weight pond to demagging and adds calcium hydroxide and organic sulfur, controls pond
Interior pH is 9~12, obtains demagging and removes weight waste water；
1-2) demagging removes weight waste water and enters primary sedimentation tank, carries out mud-water separation, obtains primary sludge and low concentration wastewater.
Further, step 2) demagging remove weight waste water enter deliming sedimentation basin group, make demagging remove weight waste water make calcium in waste water
Ion concentration is reduced to 10mg/L or less, comprising:
2-1) low concentration wastewater enters first deliming pond, the sulfate into first deliming pond, make in low concentration wastewater calcium from
Sub- concentration is reduced to 300~800mg/L, obtains first deliming waste water；
2-2) first deliming waste water enters secondary deliming pond, and carbonate, flocculant and flocculation aid is added to secondary deliming pond,
So that remaining calcium ion in waste water is generated precipitation of calcium carbonate, obtains secondary deliming waste water；
2-3) secondary deliming waste water enters secondary settling tank, carries out precipitating clarification, drops calcium ion concentration in secondary deliming waste water
Down to 10mg/L or less.
Further, sulfate concentrated water at least partly carries out flue evaporation process and/or is back to a desulfurization in step 4)
Absorption tower.
By taking above-mentioned technical proposal, sulfate can be done with reuse except Calcium treatment, and villaumite passes through multi-stage reverse osmosis and steaming
Send out crystallization treatment, two kinds of salinity other places reasons, with added amount of chemical is few, operating cost is low, producing water water quality is good, is easy to and other works
The advantages of skill combines and can recycle Nacl byproduct.In addition, the present invention can be membrane distillation system using residual heat of electric power plant
Heat source not only can be effectively reduced system operation cost, while can reduce flue-gas temperature, reduce water consumption in desulfuration absorbing tower
Amount, and reduce to environmental emission heat.
Detailed description of the invention
Fig. 1 is the arrangement schematic diagram of desulfurization wastewater zero discharge treatment device in one embodiment of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Whole description, it is clear that the described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Based on this
Embodiment in invention, every other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, shall fall within the protection scope of the present invention.Cooperation institute's attached drawing elaborates to the features and advantages of the present invention below.
As shown in Figure 1, in one embodiment, providing a kind of device of desulfurization wastewater concentration, including demagging removes weight pond
1, agitating device 2, spoil disposal pipeline 3, primary sedimentation tank 4, first deliming pond 5, agitating device 6, secondary deliming pond 7, agitating device 8, two
Heavy pond 9, spoil disposal pipeline 10, water pump 11, filter 12, nanofiltration system 13, concentrate recirculation pipeline 14, concentrated water discharge pipeline 15, in
Between pond 16, water pump 17, first-stage reverse osmosis 18, two-pass reverse osmosis 19 and crystallizing evaporator 20.
Wherein, demagging is equipped with agitating device except weight pond 1, first deliming pond 5, secondary deliming pond 7, demagging except weight pond 1, just
Heavy pond 4, deliming pond 5, secondary deliming pond 7, secondary settling tank 9 are equipped with sludge bucket and spoil disposal pipeline.
Demagging shares spoil disposal pipeline 3 except weight pond 1 and primary sedimentation tank 4, and the deliming pond 5, secondary deliming pond 7, secondary settling tank 9 share
Spoil disposal pipeline 10.
Filter is more medium filter, and remaining levitation object in waste water is avoided to influence subsequent membrane distillation operation.Select ultrafiltration
Or microfiltration systems.
Primary reverse osmosis system 18 can use ordinary RO membrane or seawater reverse osmosis membrane.Two-stage reverse osmosis system
19 use super-pressure reverse osmosis membrane.
When carrying out desulfurization wastewater zero discharge treatment using above-mentioned apparatus, desulfurization wastewater initially enters demagging and removes weight pond, to anti-
Calcium hydroxide and organic sulfur are added in Ying Chi, controlling pH in reactor is 9~12, makes magnesium and most of heavy metal life in waste water
Hydrate precipitates, and the mercury in waste water generates sulfide precipitation, to remove magnesium hardness and lead, zinc, chromium and mercury etc. in waste water
Heavy metal.
For strengthening subsequent mud-water separation effect, it can be removed to demagging in weight pond and add flocculant and flocculation aid；
Waste water is after magnesium is except weight, and into primary sedimentation tank, magnesium density is reduced in primary sedimentation tank water outlet after mud-water separation
15mg/L is hereinafter, heavy metal realizes that qualified discharge, primary sedimentation tank generate the sludge that sludge removes the generation of weight pond with demagging and be further concentrated
Dehydration, final security landfill disposition；Primary sedimentation tank supernatant enters deliming pond, and medicament B is added into deliming pond, and medicament B is
Oversaturated calcium sulfate in waste water is precipitated by increase sulfate radical in waste water concentration in sulfate, preferably sodium sulphate, thus
Achieve the purpose that remove part calcium ion, sodium sulphate dosage is 0.01~0.3mol/L in waste water, keeps calcium ion in waste water dense
Degree is reduced to 300~800mg/L；
Waste water enters secondary deliming pond in deliming pond, and combination medicament carbonate, flocculant and flocculation aid is added, and passes through group
Adding for medicament C is closed, carbonate is preferably sodium carbonate；So that remaining calcium ion in waste water is generated precipitation of calcium carbonate, is added simultaneously
Flocculant and flocculation aid improve sludge settling performance；
Waste water enters secondary settling tank in secondary deliming pond, after precipitating clarification, is reduced to calcium ion concentration in waste water
10mg/L is hereinafter, the sludge that secondary settling tank, deliming pond, secondary deliming pond generate is discharged into gypsum dehydration machine by spoil disposal pipeline and is taken off
Water process is comprehensively utilized as gypsum by-product；
The supernatant of secondary settling tank is adjusted to 6~8 by adding hydrochloric acid, by wastewater pH, is then entering filter by water pump,
Further remove the suspended matter in waste water；
Filter can use more medium filter；
Filter can use ultrafiltration or micro-filtration filtration system；
Filter water outlet enter nanofiltration system, divide salt action by nanofiltration, make the divalent ions such as sulfate radical in waste water with
The separation of the monovalent ions such as chloride ion, sulfate (predominantly sodium sulphate) concentrated water that nanofiltration system generates, a part are back to deliming
Pond provides sodium sulphate as softening medicament, the then further condensing crystallizing processing of another part residue concentrated water；
Another part residue concentrated water carries out flue evaporation process, and sodium sulphate dope is sprayed into deduster front end smoke canal, warp
After crossing the gasification of high temperature flue gas, the inorganic salts in concentrated water form solid crystal, by deduster when then passing through subsequent deduster
It is captured in the form of dirt；
Another part residue concentrate recirculation is into desulfurizing tower；
The fresh water containing chloride ion that nanofiltration system generates enters intermediate pool, then under the action of water pump, intermediate water
Waste water enters first-stage reverse osmosis in pond, waste water salt content is concentrated into 4% or more, the concentrated water that first-stage reverse osmosis generates enters second level
Waste water concentrating to salt content is greater than 10% by counter-infiltration system；
The concentrated water that two-pass reverse osmosis generates enters crystallizing evaporator, generates sodium chloride crystal salt by evaporative crystallization, as
Nacl is sold outside, and the distilled water that the clear water and crystallizing evaporator that first-stage reverse osmosis, two-pass reverse osmosis generate generate is back to electricity
Station-service water.The final zero discharge treatment for realizing desulfurization wastewater.
By taking a Practical Project as an example, certain power plant desulfurization wastewater is taken, demagging is initially entered and removes weight pond, open agitating device, to
Calcium hydroxide and organic sulfur are added in reaction tank, controlling pH in reactor is 11.5 or so, makes magnesium and most of weight in waste water
Metal generates hydroxide precipitating, and the mercury in waste water generates sulfide precipitation, and then waste water enters primary sedimentation tank, by mud-water separation
Magnesium density is reduced to 15mg/L hereinafter, heavy metal realizes that qualified discharge, primary sedimentation tank generate sludge and demagging in primary sedimentation tank water outlet afterwards
Except the further thickening processing of sludge that weight pond generates, final security landfill disposition.
Primary sedimentation tank supernatant enters deliming pond, and sodium sulphate is added into deliming pond, and dosage 0.1mol/L passes through increase
Oversaturated calcium sulfate in waste water is precipitated in sulfate radical in waste water concentration, to achieve the purpose that remove part calcium ion, waste water
The dosage of middle sodium sulphate is 0.01~0.3mol/L, and calcium ion concentration is made in waste water to be reduced to about 500mg/L by 2500mg/L.
Then waste water enters secondary deliming pond, and sodium carbonate, flocculant and flocculation aid are added into waste water, makes remaining calcium ion in waste water
Precipitation of calcium carbonate is generated, while flocculant and flocculation aid raising sludge settling performance is added, waste water enters secondary settling tank, by precipitating
After clarification, calcium ion concentration in waste water is set to be reduced to 10mg/L hereinafter, the sludge that secondary settling tank, deliming pond, secondary deliming pond generate
It is discharged into gypsum dehydration machine to be carried out dehydrating, be comprehensively utilized as gypsum by-product.
The supernatant of secondary settling tank pulls back to 6~8 by adding hydrochloric acid, by wastewater pH, is then entering filtering by water pump
Device further removes the suspended matter in waste water.Filter water outlet enters nanofiltration system, divides salt action by nanofiltration, makes waste water
The divalent ions such as middle sulfate radical are separated with monovalent ions such as chloride ions, and the sulfate (predominantly sodium sulphate) that nanofiltration system generates is dense
Water, a part are back to deliming pond, provide sodium sulphate as softening medicament, another part residue concentrated water then further condensing crystallizing
Processing；
The fresh water containing chloride ion that nanofiltration system generates enters intermediate pool, subsequently into next stage counter-infiltration system,
First-stage reverse osmosis concentrated water enters two-stage reverse osmosis system and carries out secondary concentration, by two-pass RO system by Waste water concentrating to containing
Salt amount is greater than 10%, is evaporated crystallization treatment subsequently into crystallizing evaporator, generates condensed water and sodium chloride crystal salt, crystallization
Salt outside Nacl as selling, and the fresh water that condensed water and counter-infiltration system generate is as recycle-water for preferentially making in power plant process
For boiler feedwater use.
Through calculating, ton water process expense is about 25 yuan；Compared with prior art sharp fall, and multi-products produce water can be with
Reuse can increase additional income or reduce respective handling cost.
Claims (5)
1. a kind of device of desulfurization wastewater concentration characterized by comprising
One demagging removes weight pond group, comprising: a demagging removes weight pond, is equipped with one first dosing pipe, to add calcium hydroxide and have
Machine sulphur；The primary sedimentation tank that weight pond is connected to is removed with the demagging, bottom is equipped with one first spoil disposal pipeline；
It is connected to the deliming sedimentation basin group that the demagging removes weight pond group, a first deliming pond including being sequentially communicated is removed for one or two times
Calcium pond and a secondary settling tank；The secondary settling tank is connected to a water inlet of nanofiltration system；The first deliming pond is equipped with one second and adds
Pencil road, to add sulfate；The secondary deliming pond is equipped with a third dosing pipe, to add carbonate, flocculant
And flocculation aid；The bottom in the first deliming pond, secondary deliming pond and secondary settling tank is connected to one second spoil disposal pipeline；
It is connected to a nanofiltration system of the deliming sedimentation basin group, including sulfate concentrated water outlet and a villaumite water outlet, institute
The outlet of sulfate concentrated water is stated to be connected to by a concentrate recirculation pipeline with the first deliming pond；
The multi-stage reverse osmosis system being connected to the villaumite water outlet by a concentration transfer pipeline；
With a crystallizing evaporator of the concentrated water outlet of the multi-stage reverse osmosis system.
2. the device of desulfurization wastewater concentration as described in claim 1, which is characterized in that the secondary settling tank and the water inlet
A filter is equipped between mouthful.
3. the device of desulfurization wastewater concentration as described in claim 1, which is characterized in that the multi-stage reverse osmosis system packet
Include primary reverse osmosis system and two-stage reverse osmosis system；The primary reverse osmosis system is using ordinary RO membrane or seawater with instead
Permeable membrane；The two-stage reverse osmosis system uses super-pressure reverse osmosis membrane.
4. the zero emission treatment of desulfured waste water based on any described device of claims 1 to 3, comprising the following steps:
1) desulfurization wastewater enters demagging except weight pond group, so that magnesium ion and heavy metal ion in desulfurization wastewater is generated hydroxide heavy
It forms sediment, obtains demagging and remove weight waste water, comprising:
1-1) desulfurization wastewater enters demagging except weight pond, removes in weight pond to demagging and adds calcium hydroxide and organic sulfur, controls pH in pond
It is 9~12, obtains demagging and remove weight waste water；
1-2) demagging removes weight waste water and enters primary sedimentation tank, carries out mud-water separation, obtains primary sludge and low concentration wastewater；
2) demagging removes weight waste water and enters deliming sedimentation basin group, make demagging except in weight waste water calcium ion concentration be reduced to 10 mg/L with
Under, obtain mixed salt waste water, comprising:
2-1) low concentration wastewater enters first deliming pond, and sulfate is added into first deliming pond, make in low concentration wastewater calcium from
Sub- concentration is reduced to 300~800 mg/L, obtains first deliming waste water；
2-2) first deliming waste water enters secondary deliming pond, and carbonate, flocculant and flocculation aid is added to secondary deliming pond, makes to give up
Remaining calcium ion generates precipitation of calcium carbonate in water, obtains secondary deliming waste water；
2-3) secondary deliming waste water enters secondary settling tank, carries out precipitating clarification, is reduced to calcium ion concentration in secondary deliming waste water
10 mg/L or less；
3) mixed salt waste water enters nanofiltration system；Mixed salt waste water is separated into sulfate concentrated water and villaumite fresh water；
4) sulfate concentrated water is at least partly back to deliming sedimentation basin group；Villaumite fresh water enters multi-stage reverse osmosis system, obtains light
Water and villaumite concentrated water；Villaumite concentrated water enters crystallizing evaporator, obtains evaporation condensed water and can reuse salt.
5. zero emission treatment of desulfured waste water as claimed in claim 4, which is characterized in that sulfate concentrated water is extremely in step 4)
Small part carries out flue evaporation process and/or is back to a desulfuration absorbing tower.
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| CN201610082163.8A CN105565573B (en) | 2016-02-05 | 2016-02-05 | The device and method of desulfurization wastewater zero discharge treatment |
| PCT/CN2017/072021 WO2017133511A1 (en) | 2016-02-05 | 2017-01-22 | Treatment apparatus and method for zero liquid discharge of desulfurization wastewater |
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| CN201610082163.8A CN105565573B (en) | 2016-02-05 | 2016-02-05 | The device and method of desulfurization wastewater zero discharge treatment |
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| CN105565573B (en) * | 2016-02-05 | 2019-01-25 | 大唐环境产业集团股份有限公司 | The device and method of desulfurization wastewater zero discharge treatment |
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