CN106966534A - Desulfurization wastewater Zero discharging system and technique based on ion selectivity electrodialytic technique - Google Patents
Desulfurization wastewater Zero discharging system and technique based on ion selectivity electrodialytic technique Download PDFInfo
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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
- C02F1/44—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
- C02F1/46—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
- C02F1/52—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
- C02F1/66—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
- 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
- C02F2001/5218—Crystallization
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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
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Abstract
The present invention relates to the desulfurization wastewater Zero discharging system and technique based on ion selectivity electrodialytic technique, it, which softens pretreatment mechanism, includes reactive tank, clarifier and filter.Its decrement concentration mechanism is ED ion-exchange membrane facilities.The fresh water that ED ion-exchange membrane facilities are separated out is back to desulphurization system supplement water, or concentrates reuse by reverse osmosis membrane, and reverse osmosis membrane concentrated water returns to circular treatment before softening pretreatment.The present invention is through three header PROCESS FOR TREATMENTs, pH to 9~9.5 is adjusted using lime, alkali regulation pH to more than 11 need not be added, lime less developer, bring calcium ion into few, need not add can make the sodium carbonate or sodium sulphate of calcium ion generation precipitation, water outlet after clarification precipitation, filtering is directly entered the concentration of ED ion-exchange membrane facilities decrement, technological process is short compared with prior art, run and cost of investment is low, easy to maintenance, using ion selectivity electrodialytic technique, with service life length, cycles of concentration low to water quality requirement is high, operating load is low, energy consumption is low the characteristics of.
Description
Technical field
The invention belongs to environmentally friendly water-treatment technology field, more particularly to a kind of taking off based on ion selectivity electrodialytic technique
Sulphur wastewater zero discharge system and technique.
Background technology
Sulfur dioxide (chemical formula SO2), is the one of the main reasons for causing atmosphere pollution, is also the important original for causing acid rain
Cause, is one of Air Pollutant Discharge.The gas can be sprayed during volcano eruption, titanium dioxide can be also produced in many industrial process
Sulphur.Because coal and oil generally all contain element sulphur, therefore sulfur dioxide can be generated during burning.When sulfur dioxide is soluble in water,
Sulfurous acid can be formed.If sulfurous acid is further aoxidized under conditions of PM2.5 presence, sulfuric acid will be efficiently produced rapidly.This
Be exactly to use these fuel as the environmental effect of the energy worry the reason for one of.
The year end of cut-off 2010, the Target of Total Pollutant Amount Control that China completes the Eleventh Five-Year Plan period is whole year SO2Discharge capacity 2246.7
Ten thousand tons, the wherein controlled quentity controlled variable of power industry is 951.7 ten thousand tons.In numerous industrial processes, coal fired power plant flue gas desulfurization system
System is SO2Discharge rich and influential family.Among these, lime stone~gypsum wet desulfurization is that power plant desulfurization is most widely used, technology is most ripe
Sulfur removal technology.In order to maintain the balance of desulfurizer serum recycle system material, soluble fraction i.e. cl concn in flue gas is prevented
More than setting and ensure gypsum quality, it is necessary to discharge a certain amount of waste water from system, waste water essentially from gypsum dehydration and
Purging system.Then the processing for the desulfurization wastewater that this technique is produced is the big problem that we face.Desulfurization wastewater mainly contained
Sulphite, suspension, sulfate and the heavy metal ion of saturation.Because most of material is all rule in national environmental standard
The first fixed pollutant, environmental pollution is more serious.Therefore, it is necessary to be discharged after being effectively treated to desulfurization wastewater.Then
The processing for the desulfurization wastewater that this technique is produced is the big problem that we face.
On April 16th, 2015, State Council's issue《Water pollution action plan》《Ten, water》, country is by reinforcing to the dirt of all kinds of water
The management of dye." ten, water " is clearly proposed, to the year two thousand twenty, National Water Environmental quality obtains interim improvement, seriously polluted
Water body is reduced by a relatively large margin, and " taking charge of industrial pollution control severely " turns into vital task, and multinomial standard further becomes tight, some emphasis areas
Domain even will forbid sewage discharge.On September 30th, 2016, Chinese Ministry of Environmental Protection is issued on soliciting《Thermal power plant's pollution prevention technique policy》
With《The optimal practicable techniques guide of thermal power plant's prevention and cure of pollution》Opinion letter, to the waste gas of power plant emission, waste water, noise, solid
Basic technical policy is formulated in the pollution that discarded object etc. is caused, and is explicitly pointed out on waste water：Thermal power plant's water prevention and cure of pollution should be followed
Remove contamination shunting, multi-purpose water, focus on the principle being combined with decentralized processing, encourage thermal power plant to realize the recycling of waste water
It is not outer to arrange.
In China, thermal power plant is as water consumption rich and influential family, and its water consumption accounts for the 30%~40% of industrial water consumption, annual thermoelectricity
The water consumption of factory is in upper body trend, while wastewater discharge also increases year by year.Therefore, it is that thermal power plant can to realize waste water zero emission
Sustainable development outlet.In view of above-mentioned defect, the design people is actively subject to research and innovation, to found it is a kind of more suitable for
China's actual conditions and cost of investment and operating cost low and easily operated and management Zero discharging system and technique, have more it
Value in industry.
The content of the invention
In order to solve the above technical problems, being taken off it is an object of the invention to provide a kind of mainly for calcic magnesium ion concentration is high
The Zero discharging system and technique of sulphur waste water.Solving the softening pretreatment of high-concentration Ca magnesium ion desulfurization wastewater needs to add large quantities of lime
With sodium carbonate medicament, operating cost is high, sludge quantity is big, technological process length, the problems such as equipment investment is high.Technical solution of the present invention is such as
Under：
One of the object of the invention, a kind of desulfurization wastewater Zero discharging system based on ion selectivity electrodialytic technique, including
Softening pretreatment mechanism, decrement concentration mechanism and crystallization mechanism, reactive tank that softening pretreatment mechanism includes being sequentially connected,
Clarifier and filter, the waste liquid filtered out by filter enter the concentration of decrement concentration mechanism, wherein, the decrement is dense
Contracting mechanism is ED ion-exchange membrane facilities, and the water outlet of the ED ion-exchange membrane facilities is connected to desulphurization system moisturizing, or passes through reverse osmosis
Permeable membrane concentrates reuse, and reverse osmosis membrane concentrated water returns to circular treatment before softening pretreatment, the concentrated water outlet of the ED ion-exchange membrane facilities
Crystallization mechanism is connected to, the concentrated water that ED ion-exchange membrane facilities are separated out crystallizes salt manufacturing, or enters flue sprinkling, or enters dragveyer system
System digestion.
Inventive desulfurization wastewater zero discharge system, further, the waste liquid filtered out by filter need not add carbonic acid
Sodium or sodium sulphate remove the medicament of calcium ion, are directly entered ED ion-exchange membrane facilities and are concentrated.
Inventive desulfurization wastewater zero discharge system, further, is provided with pH detection means in the reactive tank, uses
In monitoring reactive tank regulation pH to 9~9.5.
Inventive desulfurization wastewater zero discharge system, further, the clarifier are connected with dewatering device by pipeline,
Precipitating sludge in clarifier is delivered to dewatering device and carries out sludge drying.
The two of the object of the invention, a kind of desulfurization wastewater technique of zero discharge based on ion selectivity electrodialytic technique, including
Following step,
Pretreatment, waste water alkalescence is adjusted, then after adjuvant flocculating setting, the supernatant being filtrated to get；
Decrement is concentrated, and pre-processes obtained supernatant through ion selectivity electrodialysis process, and concentrate TDS is up to 200,000 mg/L
Above, the chlorine ion concentration of desalinization liquor can be reduced to any numerical value within 100~6000mg/L, and obtained fresh water is reclaimed and used
Water is supplemented in desulphurization system, or reuse is concentrated by reverse osmosis membrane, reverse osmosis membrane concentrated water returns to circular treatment before softening pretreatment；
Crystallization, the concentrate of decrement concentration crystallizes into salt, or enters flue sprinkling, or enters the digestion of the systems such as dragveyer.
Inventive desulfurization process without drainage of waste water, further, in pre-treatment step, carries out waste water alkalescence using lime and adjusts
Section, final regulation to pH9~9.5.
Inventive desulfurization process without drainage of waste water, further, the supernatant are removed after heavy metal and suspended impurity
Decrement concentration is carried out again.
Inventive desulfurization process without drainage of waste water, further, the adjuvant include flocculant and organic sulfur, its
In, the flocculant is poly-aluminium flocculant or polyferric flocculant.
Inventive desulfurization process without drainage of waste water, further, in decrement concentration step, supernatant is through ion selectivity
The fresh water chlorine ion concentration obtained after electrodialysis process can be reduced to any numerical value within 100~6000mg/L, and its fresh water can
Reuse is concentrated for desulphurization system supplement water, or by reverse osmosis membrane, reverse osmosis membrane concentrated water is circulated before returning to softening pretreatment
Processing.
Inventive desulfurization process without drainage of waste water, further, in decrement concentration step, supernatant is through ion selectivity
The concentrated water TDS obtained after electrodialysis process is more than 200000mg/L, and its concentrated water is directly entered crystallizer salt manufacturing, or enters flue spray
Spill, or enter the digestion of dragveyer system.
By such scheme, the present invention at least has advantages below：
1. the present invention adjusts pH to 9~9.5 through traditional three headers PROCESS FOR TREATMENT using lime, useless without such as other desulfurization
Water zero discharge project equally adds alkali to adjust pH to more than 11, lime less developer, thus the calcium ion brought into also less, without adding
Sodium carbonate or sodium sulphate (can make calcium ion generation precipitation) dosing, by the pre-treatment step of clarification precipitation, filtering, water outlet is direct
Into the concentration of ED ion-exchange membrane facilities decrement, technological process is short compared with prior art, run and cost of investment is low, easy to maintenance；
2. decrement concentration uses ion selectivity electrodialytic technique, and electrodialytic membranes service life is long, to influent quality requirement
It is low, but cycles of concentration is high, and TDS can be concentrated into 200,000 more than mg/L, make later crystallization device operating load low, can both be prevented effectively from dense
Water side deposition, can reduce the energy consumption cost of concentration systems again, so as to reduce total system power consumption, reduction operation is total originally low.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention,
And can be practiced according to the content of specification, below with presently preferred embodiments of the present invention and coordinate accompanying drawing describe in detail as after.
Brief description of the drawings
Fig. 1 is the structural representation of the desulfurization wastewater zero-emission of the invention based on ion selectivity electrodialytic technique.
The implication of each reference is as follows in figure.
The reactive tank of 1 ED ion-exchange membrane facilities 2
The filter of 3 clarifier 4
The chemicals dosing plant of 5 pH detection means 6
The desulphurization system of 7 dewatering device 8
Embodiment
With reference to the accompanying drawings and examples, the embodiment to the present invention is described in further detail.Implement below
Example is used to illustrate the present invention, but is not limited to the scope of the present invention.
Referring to Fig. 1, the desulfurization wastewater Zero discharging system of the invention based on ion selectivity electrodialytic technique, including softening are pre-
Processing mechanism, decrement concentration mechanism and crystallization mechanism.The present invention is described in detail respectively per part body below.
【Softening pretreatment mechanism】
In the prior art, softening pretreatment is generally soft using Dual alkali in order to remove the magnesium and calcium in desulfurization wastewater completely
Change method.I.e. the first step first adjusts more than PH11.5 to desulfurization wastewater feeding lime, and aids in adding flocculant, organic sulfur etc..The
One step adds sodium carbonate or sodium sulphate medicament, respectively with desulfurization wastewater calcium ions and magnesium ions reaction generation calcium carbonate or calcium sulfate and
Magnesium hydrate precipitate, with heavy metal reaction generation sulfide precipitation.Water after the softening of above-mentioned precipitation adds flocculant flocculation
Settled by clarifier, supernatant carries out filtering and goes after most suspension in water removal, precipitating sludge sludge delivery pump to locate
Reason.
Prior art softening pretreatment is further concentrated to required concentration due to needing Dual alkali softening to go demagging and calcium completely,
Such as 200,000 more than mg/L, there is that processing technological flow is long, cost of investment is high, runs the high shortcoming of dosage.
Present invention softening pretreatment, softening pretreatment mechanism includes the reactive tank 2, clarifier 3 and filtering dress being sequentially connected
4 are put, the softening pretreatment mechanism includes reactive tank 2, clarifier 3 and the filter 4 being sequentially connected, and is filtered by filter 4
The waste liquid gone out enters the concentration of decrement concentration mechanism.Ph detection means 5 is provided with the reactive tank 2, it is anti-for monitoring
Groove 2 is answered to adjust pH9~9.5.Chemicals dosing plant 6 is provided with the reactive tank 2, the Ph detection means 5 and chemicals dosing plant 6 can connect
Automatic controls (accompanying drawing is not shown) is connect, the Automated condtrols such as dosing are realized.The desulfurization wastewater enters reactive tank 2, anti-
Answer in groove 2 plus lime medicament, the general alkalescence of regulation PH 9~9.5 without adjusting more than PH11.5 strong alkali environment, and is aided in
Flocculant and organic sulfur etc., the preferred poly-aluminium flocculant of flocculant or polyferric flocculant are added, respectively with the heavy metal in water
Ionic reaction generation hydroxide precipitation and sulfide precipitation.Water after precipitation softening is added after flocculant flocculation through clarification
Device 3 is settled, and supernatant removes most suspension in water removal through filter 4, and supernatant is removed after heavy metal and suspended impurity
Decrement concentration is carried out again.The clarifier 3 is connected with dewatering device 7 by pipeline, and the precipitating sludge in clarifier 3 is delivered to
Dewatering device 7 carries out sludge drying, you can precipitating sludge, which is transported to sludge delivery pump after dewatering system desiccation, transports outward landfill.This
Filter 4 includes filter, tubular membrane or other equipment.Calcium ions and magnesium ions can enter without being precipitated as ionic condition
Enter subsequent technique.
Lime medicament is added in pretreating process of the present invention, reactive tank 2, PH need to be only adjusted to 9~9.5, and this process is only needed
Heavy metal ion is generated and precipitated, it is not necessary to calcium ions and magnesium ions are removed, compared with the softening of prior art Dual alkali, technological process
Short, cost of investment is low, save large quantities of lime dosage, is used for the medicament of precipitated calcium, tool without adding sodium carbonate or sodium sulphate etc.
There is less developer, operation and cost of investment are low, and technological process is short, floor space is small, advantage easy to maintenance.Present invention softening
Pretreatment is combined with follow-up ion selectivity electrodialytic technique, is applicable to the higher desulfurization wastewater zero of all calcic magnesium ions
Discharge.
【Decrement concentrates mechanism】
The higher desulfurization wastewater of prior art calcic magnesium ion, decrement concentration technology be generally multiple-effect or MVR evaporators,
SWRO or DTRO or STRO+FO, SWRO or DTRO or STRO+ multiple-effect or MVR evaporators, it is specific as follows：
Multiple-effect or MVR evaporation technologies：Waste water after softened filtering is directly by multi-effect evaporator or MVR evaporators to useless
Water is evaporated concentration.There is cost of investment height, the high shortcoming of operating cost in this technique.
SWRO or DTRO or STRO+FO techniques：Waste water after softened filtering produces Water circulation, RO film concentrated waters by RO films
Concentrated again into FO techniques.FO production water is back to RO water inlets and reprocessed.Concentrated water TDS reaches 200,000 mg/L.This technique
There is cost of investment high, film renewal cost is high, water inlet is high to index requests such as hardness and silicon, FO technological processes are complicated, run into
The shortcomings of this is higher.
SWRO or DTRO or STRO+ multiple-effect or MVR evaporator process：Waste water after softened filtering produces water by RO films
Reuse, RO films concentrated water is concentrated again into evaporator process.It is long that this technique equally exists technological process, and cost of investment is high, fortune
The costly shortcoming of row.
The decrement concentration of patent of the present invention uses ion selectivity electrodialytic technique, i.e. ED technologies, and not only concentration is at
The high slat-containing wastewater of reason, and selectively can only concentrate univalent anion.It is useless after present invention softening pretreatment processing
Water is concentrated by ion selectivity ED equipment, and concentrate TDS can reach 200,000 more than mg/L, the chlorine ion concentration of desalinization liquor
It can be reduced to below 1000mg/L, therefore ED fresh water can be directly used for the supplement water of desulphurization system 8.ED concentrated water main component
For chloride, including sodium chloride, magnesium chloride and calcium chloride etc., the carnallite rich in magnesium can be prepared into crystallization processes, or
Handled using flue sprinkling evaporation technique, realize that system zero liquid is discharged.Therefore, the production water of softening pretreatment is directly entered
Ion selectivity ED equipment, compared to other ED techniques, can produce same Waste water concentrating effect, but can shorten technological process, save
Overall cost of investment, significantly reduces medicine consumption, reduction system power consumption etc..
【Crystallize mechanism】
Present invention crystallization is preferred to use flue sprinkling evaporation technique.
It should be noted that the water outlet of the ED ion-exchange membrane facilities 1 is connected to softening pretreatment mechanism, by ED ions
The fresh water that film device 1 is separated out is back to the moisturizing of softening pretreatment mechanism, and the concentrated water outlet of the ED ion-exchange membrane facilities 1 is connected to knot
Brilliant mechanism, the concentrated water that ED ion-exchange membrane facilities 1 are separated out crystallizes salt manufacturing.
The operation principle of the present invention is as follows：
Pretreatment, waste water alkalescence is adjusted, then after adjuvant flocculating setting, the supernatant being filtrated to get.Specifically, can
The high desulfurization wastewater of calcic magnesium ion concentration is passed through into preliminary sedimentation tank, bulky grain suspension etc. is removed, water outlet is promoted to softening with pump
Pretreatment system, softening pretreatment mechanism includes reactive tank 2, clarifier 3 and the filter 4 being sequentially connected.To desulfurization wastewater
It is heavy that feeding lime adjusts ionic reaction generation calcium sulfate precipitation and hydroxide and sulfide of the pH value into 9~9.5, with water
Form sediment, the water after precipitation softening is settled after adding flocculant flocculation through clarifier 3, and precipitating sludge is transported to sludge delivery pump
Landfill is transported outward after dewatering system desiccation.
Decrement is concentrated, after the water outlet of clarifier 3 is filtered into filter plant, and water outlet is met in ED water inlet limits,
Into subsequent ion selectively concentration ED techniques and crystallization processes, that is, obtained supernatant is pre-processed through ion selectivity electrodialysis
Processing, concentrate TDS can be reduced to below 1000mg/L up to 200,000 more than mg/L, chlorine ion concentration, and obtained fresh water is reclaimed
Water is supplemented for desulphurization system；
Crystallization, the concentrate of decrement concentration crystallizes into salt.
By above-mentioned technical proposal, the present invention adjusts pH9~9.5 through lime, and pH11.5, lime chemical feeding quantity are adjusted without such as tradition
It is few, thus sodium carbonate or sodium sulphate (can make calcium ion generation precipitation) chemical feeding quantity also largely reduce, then through flocculation sediment, filtering
Pre-treatment step, the direct decrement concentration of water outlet, operation and cost of investment are low compared with prior art, and technological process is short, take up an area
Area is small, easy to maintenance.Decrement concentration of the present invention uses ion selectivity electrodialytic technique, and electrodialytic membranes service life is long, right
Influent quality requires low, but cycles of concentration is high, and TDS can be concentrated into 200,000 more than mg/L, make later crystallization device operating load low, both
Dense water side deposition can be prevented effectively from, the energy consumption cost of concentration systems can be reduced again, so that total system power consumption is reduced, reduction operation
It is total originally low.Described above is only the preferred embodiment of the present invention, is not intended to limit the invention, it is noted that for this skill
For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is some improvement and
Modification, these improvement and modification also should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of desulfurization wastewater Zero discharging system based on ion selectivity electrodialytic technique, it is characterised in that：It is pre- including softening
Processing mechanism, decrement concentration mechanism and crystallization mechanism, it is reactive tank (2) that softening pretreatment mechanism includes being sequentially connected, clear
Clear device (3) and filter (4), the waste liquid filtered out by filter (4) enter the concentration of decrement concentration mechanism, wherein, institute
It is ED ion-exchange membrane facilities (1) to state decrement concentration mechanism, and the water outlet of the ED ion-exchange membrane facilities (1) is connected to desulphurization system
(8) moisturizing, or by reverse osmosis membrane concentrate reuse, reverse osmosis membrane concentrated water return to softening pretreatment before circular treatment, the ED from
The concentrated water outlet of sub- film device (1) is connected to crystallization mechanism, and the concentrated water that ED ion-exchange membrane facilities (1) are separated out crystallizes salt manufacturing, or enters
Enter flue sprinkling, or enter the digestion of dragveyer system.
2. the desulfurization wastewater Zero discharging system according to claim 1 based on ion selectivity electrodialytic technique, its feature
It is：The waste liquid filtered out by filter (4) need not add sodium carbonate or sodium sulphate removes the medicament of calcium ion, be directly entered
ED ion-exchange membrane facilities (1) are concentrated.
3. the desulfurization wastewater Zero discharging system according to claim 1 based on ion selectivity electrodialytic technique, its feature
It is：PH detection means (5) is provided with the reactive tank (2), for monitoring reactive tank (2) regulation pH to 9~9.5.
4. the desulfurization wastewater Zero discharging system according to claim 1 based on ion selectivity electrodialytic technique, its feature
It is：The clarifier (3) is connected with dewatering device (7) by pipeline, and the precipitating sludge in clarifier (3) is delivered into dehydration
Mechanism (7) carries out sludge drying.
5. a kind of desulfurization wastewater technique of zero discharge based on ion selectivity electrodialytic technique, it is characterised in that：Including following steps
Suddenly,
Pretreatment, waste water alkalescence is adjusted, then after adjuvant flocculating setting, the supernatant being filtrated to get；
Decrement is concentrated, and pre-processes obtained supernatant through ion selectivity electrodialysis process, concentrate TDS up to 200,000 mg/L with
The upper, chlorine ion concentration of desalinization liquor can be reduced to any numerical value within 100~6000mg/L, and obtained fresh water, which is reclaimed, to be used for
Desulphurization system supplements water, or concentrates reuse by reverse osmosis membrane, and reverse osmosis membrane concentrated water returns to circular treatment before softening pretreatment；
Crystallization, the concentrate of decrement concentration crystallizes into salt, or enters flue sprinkling, or enters the digestion of the systems such as dragveyer.
6. the desulfurization wastewater technique of zero discharge according to claim 5 based on ion selectivity electrodialytic technique, its feature
It is：In pre-treatment step, waste water alkalescence is carried out using lime and adjusted, final regulation to pH9~9.5.
7. the desulfurization wastewater technique of zero discharge according to claim 5 based on ion selectivity electrodialytic technique, its feature
It is：The supernatant, which is removed, directly carries out decrement concentration after heavy metal and suspended impurity.
8. the desulfurization wastewater technique of zero discharge according to claim 5 based on ion selectivity electrodialytic technique, its feature
It is：The adjuvant includes flocculant and organic sulfur, wherein, the flocculant is poly-aluminium flocculant or polyferric flocculant.
9. the desulfurization wastewater technique of zero discharge according to claim 5 based on ion selectivity electrodialytic technique, its feature
It is：In decrement concentration step, the fresh water chlorine ion concentration that supernatant is obtained after ion selectivity electrodialysis process can be reduced
Any numerical value within to 100~6000mg/L, its fresh water can be used for desulphurization system supplement water, or by reverse osmosis membrane concentration
Reuse, reverse osmosis membrane concentrated water returns to circular treatment before softening pretreatment.
10. the desulfurization wastewater technique of zero discharge according to claim 5 based on ion selectivity electrodialytic technique, its feature
It is：In decrement concentration step, the concentrated water TDS that supernatant is obtained after ion selectivity electrodialysis process is more than 200000mg/
L, its concentrated water is directly entered crystallizer salt manufacturing, or enters flue sprinkling, or enters the digestion of dragveyer system.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107311350A (en) * | 2017-08-17 | 2017-11-03 | 长兴上拓环境科技有限公司 | A kind of recycling treatment process of thermal power plant desulfurization wastewater |
| CN107827270A (en) * | 2017-09-29 | 2018-03-23 | 杭州匠容道环境科技有限公司 | Industrial strong brine zero-emission softening pretreatment system and technique |
| CN108059255A (en) * | 2017-12-27 | 2018-05-22 | 大唐（北京）水务工程技术有限公司 | Dispensing system and method in a kind of processing applied to high magnesium desulfurization wastewater |
| CN108383308A (en) * | 2018-02-11 | 2018-08-10 | 浙江天蓝环保技术股份有限公司 | A kind of low energy consumption desulfurization wastewater technique of zero discharge and device |
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| CN107311350A (en) * | 2017-08-17 | 2017-11-03 | 长兴上拓环境科技有限公司 | A kind of recycling treatment process of thermal power plant desulfurization wastewater |
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| CN108383308A (en) * | 2018-02-11 | 2018-08-10 | 浙江天蓝环保技术股份有限公司 | A kind of low energy consumption desulfurization wastewater technique of zero discharge and device |
| CN111170524A (en) * | 2020-01-14 | 2020-05-19 | 上海申能崇明发电有限公司 | Reverse osmosis concentrated water recycling method |
| CN111439883A (en) * | 2020-05-08 | 2020-07-24 | 浙江浙能技术研究院有限公司 | Coal-fired power plant wet desulphurization wastewater decrement zero-discharge treatment system and method |
| CN112358096A (en) * | 2020-10-23 | 2021-02-12 | 重庆聚狮新材料科技有限公司 | Refining method for polyphenylene sulfide rectification recovered water |
| CN112811442A (en) * | 2020-12-21 | 2021-05-18 | 肥城胜利盐业有限公司 | Process and system for refining salt by using high-salinity wastewater |
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