CN205575837U - Processing system of lime stone / lime - gypsum method flue gas desulfurization waste water - Google Patents

Processing system of lime stone / lime - gypsum method flue gas desulfurization waste water Download PDF

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Publication number
CN205575837U
CN205575837U CN201620159670.2U CN201620159670U CN205575837U CN 205575837 U CN205575837 U CN 205575837U CN 201620159670 U CN201620159670 U CN 201620159670U CN 205575837 U CN205575837 U CN 205575837U
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water
processing
unit
precipitation
nacl
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王旭
周敏
张旭兵
罗海泉
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Beijing Xinyuan Guoneng Technology Group Co Ltd
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Beijing Xinyuan Guoneng Technology Group Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/30Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37Wastewater or sewage treatment systems using renewable energies using solar energy

Abstract

The utility model provides a processing system of lime stone / lime - gypsum method flue gas desulfurization waste water includes according to the water conservancy of the pending desulfurization waste water flow direction in proper order: sediment / clarification unit, it is used for throwing with lime, sodium sulphate, heavy metal precipitating agent, flocculating agent and coagulant and deposits, the electrodialysis unit, it is provided with homogeneous phase unit price amberplex, with so that the play water of sediment / clarification unit passes through form behind the homogeneous phase unit price amberplex and contain naCl product water and contain the dense water of caSO4, and naCl product water recovery unit, it is used for retrieving it produces water to contain naCl. The utility model provides a processing system has realized the zero release, and equipment is simple, the treatment effeciency is high, has realized the resourceization of wastes material, can directly obtain usable industrial grade product, and reagent cost, equipment cost, energy consumption are all lower to can make whole operation management cost obviously be less than the cost of current technology.

Description

A kind of processing system of limestone/lime-gypsum method flue gas desulfurization waste-water
Technical field
This utility model relates to field of industrial waste water treatment, is specifically related to the processing system of a kind of limestone/lime-gypsum method flue gas desulfurization waste-water.
Background technology
Developing the construction with large coal-fired power plant rapidly along with China's energy industry, firing rate is continuously increased, SO2Discharge capacity get more and more, the atmospheric pollution thereby resulted in also is on the rise.At present, flue gas desulfurization is considered as to control SO2The most effective approach of discharge capacity.The sulfur removal technology that limestone/lime-gypsum method wet process of FGD is the most domestic and application is at most in the world, technology is the most ripe.In general, coal-burning power plant's limestone/lime-gypsum method smoke-gas wet desulfurization uses lime stone slurry to be sprayed in absorption tower, with the SO in flue gas2Reaction generates CaSO3、CaSO4, to reach to remove SO in flue gas2Purpose.In order to control the C1 of desulfuration absorbing tower limestone loop slurry-、F-Concentration Deng harmful element, reduce the serosity corrosion to equipment, the flying dust being washed down in flue gas is discharged simultaneously, desulfurizer serosity is maintained to follow system material balance and ensure gypsum quality, a certain amount of waste water must be discharged from system, it is desulfurization wastewater, essentially from cyclone overflowing liquid, the filtrate of vacuum belt dewaterer or the flushing water of gypsum dehydration system.
Limestone/lime-gypsum method flue gas desulfurization waste-water has the following characteristics that
(1) pH value is typically between 1~6.5, therefore in acidity.
(2) (gypsum particle, SiO are included containing substantial amounts of float2, the hydroxide of Al and Fe), fluoride and the heavy metal of trace, such as As, Cd, Cr, Hg etc., float mass fraction, generally between 9000~12700mg/L, even may be up to 50000mg/L in actual production process.
(3) containing substantial amounts of sulphite, sulfate etc., its concentration change is generally in the range of between 3000~60000mg/L, and hardness height causes easy fouling, CaSO4It is in hypersaturated state.
(4) containing Na+、K+、Ca2+、Mg2+、Cl-、SO4 2-、F-、NO3-, Multiple components, complicated component and the water quality such as heavy metal ion such as As, Cd, Cr, Hg is different with operating mode in time and changes, intensity of variation is bigger sometimes.
(5) salinity is high, especially C1-Content is high, adds in acidity, and corrosivity is the strongest.
Feature based on desulfurization wastewater, is very easy to environment is caused significant damage as dealt with improperly.In recent years, the concept of desulfurization wastewater zero-emission is received by increasing coal-burning power plant, reduces the pollutant injury to environment, preferably changing waste into resources the most to greatest extent.
The desulfurization wastewater technique of zero discharge occurred at present mainly includes following a few class:
(1) full-boiled process evaporation technology
Technical process is: pretreatment+full-boiled process evaporative crystallization.
(2) reverse osmosis membrane (RO) concentration technology
Technical process is: pretreatment+RO pre-concentration+full-boiled process evaporative crystallization.
(3) forward osmosis membrane (FO) concentration technology
Technical process is: pretreatment+FO membrance concentration (reclaim and draw the NH in liquid by supporting rectification3/CO2The dense water of)+full-boiled process evaporative crystallization FO film.
(4) flue evaporation
Technical process is: Wastewater Pretreatment unit+reverse osmosis membrane concentration/electrodialytic membranes upgrading unit (or not having this technique unit)+flue evaporation.
(5) membrane distillation technique
Main technique is that the steam pressure difference utilizing film both sides distills, thus realizes pollutant and separate with water.
(6) nanofiltration (NF) technique
Technical process is: degree of depth pretreatment/further degree of depth pretreatment+NF+ upgrading unit (or not having)+full-boiled process evaporative crystallization or electrolysis.
All there is a certain degree of defect in above-mentioned various desulfurization wastewater Zero-discharge treating process, specifically includes that 1) technique is relative complex;2) pretreatment process length, pretreatment operation medicament costly;3) overall operation is costly;4) overall investment is higher;5) operational management is more complicated;6) there is no changing waste into resources effect or DeGrain.
Utility model content
For the defect overcoming existing desulfurization wastewater zero-discharge treatment system to exist, finding the desulfurization wastewater treatment system that a kind of technique is simple, energy consumption is low, refuse can be utilized effectively, the purpose of this utility model is to provide the processing system of a kind of limestone/lime-gypsum method flue gas desulfurization waste-water.
The processing system that this utility model provides is flowed to include following processing unit successively by the waterpower of pending desulfurization wastewater:
Precipitation/clarification unit, for feeding lime, sodium sulfate, heavy metal precipitator, flocculant and coagulant and precipitate;
Electrodialysis cell, is provided with homogeneous monovalention exchange membrane, in order to make the water outlet of described precipitation/clarification unit produce water and containing CaSO by being formed after described homogeneous monovalention exchange membrane containing NaCl4Dense water;And
NaCl produces Water Sproading unit, described containing NaCl product water in order to reclaim.
In the processing system that this utility model provides, described NaCl produces Water Sproading unit and includes evaporated crystallization device or electrolysis unit.
In the processing system that this utility model provides, described evaporated crystallization device is selected from function of mechanical steam recompression device, thermodynamic steam recompression device or multi-effect evaporating device.
In the processing system that this utility model provides, described precipitation/clarification unit includes potassium permanganate composites, horizontal sedimentation tank, inclined-plate clarifying basin or clarification concentration basin.
In the processing system that this utility model provides, described electrodialysis cell includes direct electrodialysis plant or pole-reversing electroosmosis device.
In the processing system that this utility model provides, described processing system also includes filter element, and it is arranged at described precipitation/between clarification unit and described electrodialysis cell.
In the processing system that this utility model provides, described filter element includes one or more filter, and the filtered version of described filter is selected from fiber filter, sand media filtration, security personnel's filtration, ultrafiltration or microfiltration.
In the processing system that this utility model provides, described processing system also includes regulating precipitation unit, before it is arranged at described precipitation/clarification unit, in order to the float in desulfurization wastewater pending described in regulating pondage water quality, preliminary sedimentation.
In the processing system that this utility model provides, described processing system also includes sludge treating block, and it is connected with described precipitation/clarification unit and/or described regulation precipitation unit, in order to process the precipitating sludge of gained.
The desulfurization wastewater treatment system that this utility model provides have employed the combination of " Calx/sodium sulfate dosing precipitation process+homogeneous monovalention exchange membrane electrodialysis " first, from desulfurization wastewater, monovalent salt (major part is NaCl) is extracted by homogeneous monovalention exchange membrane, the moisture of desulfurization wastewater side is not required to concentrate, the monovalent salt solution extracted obtains solid salt by evaporative crystallization, or the monovalent salt solution of electroextraction is recycled product, all meet industrial standard, without processing the resource that can realize refuse further, equipment is simple, cost of investment is low, less energy consumption, can be continuous, stable operation.
Sum it up, the processing system that this utility model provides has the advantage that
(1) whole processing procedure achieves zero-emission, and technique is simple, treatment effeciency is high.
(2) resource of refuse is achieved, it is possible to directly obtain available technical grade product, improve industrial value further.
(3) reagent cost, equipment cost, energy consumption are the most relatively low, thus can make the overall operation management cost cost significantly lower than existing technique.
Accompanying drawing explanation
Fig. 1 is the structural representation of processing system described in the utility model;
Wherein, description of reference numerals is as follows: 1, precipitation/clarification unit;2, electrodialysis cell;3, NaCl produces Water Sproading unit;4, filter element;5, regulation precipitation unit;6, sludge treating block;A, desulfurization wastewater are intake;B, regulation precipitation unit water outlet;C, regulation precipitation unit mud;D, medicament;E, precipitation/clarification unit mud;F, sludge treating block backwater;G, precipitation/clarification unit water outlet;H, acid;I, filter element water outlet;J, containing NaCl produce water;K, containing CaSO4Dense water;L, evaporation water;M, crystal salt.
Detailed description of the invention
This utility model provides processing of a kind of limestone/lime-gypsum method flue gas desulfurization waste-water and flows to include following processing unit successively by the waterpower of pending desulfurization wastewater:
Precipitation/clarification unit, for feeding lime, sodium sulfate, heavy metal precipitator, flocculant and coagulant and precipitate;
Electrodialysis cell, is provided with homogeneous monovalention exchange membrane, in order to make the water outlet of described precipitation/clarification unit produce water and containing CaSO by being formed after described homogeneous monovalention exchange membrane containing NaCl4Dense water;And
NaCl produces Water Sproading unit, described containing NaCl product water in order to reclaim.
When above-mentioned processing system is run, pending desulfurization wastewater flows first to precipitation/clarification unit, by the medicaments such as feeding lime, sodium sulfate, TMT15 and the precipitation process after adding medicament, can realize calcium temporarily hard, magnesium hard, colloidal silicon and the removal of non-colloid silicon, heavy metal, partial organic substances etc., main with NaCl, CaSO in water outlet4Being main, water outlet is alkalescence due to pharmacy effect, adds conventional hydrochloric acid or sulphuric acid is neutralized, can send into follow-up electrodialysis cell.Electrodialysis cell arranges homogeneous monovalention exchange membrane, and this film has the high selective penetrated property to monovalention (NaCl), and to bivalence and multivalent ion (CaSO4) the most not there is permeability or extremely low permeability, then can realize the separation of NaCl, be formed and produce water and containing CaSO containing NaCl4Dense water.NaCl produces water entrance NaCl product Water Sproading unit and reclaims, containing CaSO4Dense water also can reclaim according to prior art.
In an embodiment according to processing system of the present utility model, produce water containing NaCl and can be reclaimed by evaporative crystallization, therefore, NaCl produces Water Sproading unit and includes evaporated crystallization device.Centrifugation due to electrodialytic membranes, the NaCl concentration produced in water containing NaCl is concentrated to higher concentration, the solid salt of evaporative crystallization gained can reach more than two grades of (sodium chloride >=92%/moisture content≤6%) standards of GB/T 5462-2003 Exposure to Sunlight Nacl, it is achieved that the resource recycling of solid waste.Evaporative crystallization obtains pure evaporation water simultaneously, is cooled to less than 60 DEG C, after meeting electrodialytic inflow temperature requirement, can be re-fed into electrodialytic product water side as water inlet, so can realize producing the closed cycle of water side.Due to electro-osmosis effect, the water yield producing water side also can slowly be accumulated, therefore, if evaporation water hypervolia, it is also possible to would arrange outward, maybe can send into dense water side to reduce fouling tendency.This utility model is not specially limited for evaporated crystallization device, the existing evaporated crystallization device in this area, includes but not limited to that function of mechanical steam recompression device, thermodynamic steam recompress device, multi-effect evaporating device etc..
In an embodiment according to processing system of the present utility model, produce water containing NaCl and can also be reclaimed by electrolytic preparation NaClO, therefore, NaCl produces Water Sproading unit and includes evaporated crystallization device.The product quality that electrolysis obtains can meet the inflow requirement of HJ/T 258 environmental protection product technology requirement-electrolysis hypochlorite generator; product NaClO solution can be sold as outside the disinfectant of electric power plant circulating water and/or commodity, achieves the resource recycling of solid waste equally.This utility model is not specially limited for electrolysis unit, the existing electrolysis unit in this area.
In an embodiment according to processing system of the present utility model, the method for operation of electrodialysis plant is not construed as limiting, includes but not limited to direct electrodialysis (ED) device, pole-reversing electroosmosis (EDR) device etc..
In an embodiment according to processing system of the present utility model, precipitation/clarification unit can use the existing device in this area, function is to realize the separation of muddy water, does not limit concrete form, can be potassium permanganate composites, horizontal sedimentation tank, inclined-plate clarifying basin, clarification concentration basin etc..
In an embodiment according to processing system of the present utility model, processing system also includes filter element, and it is arranged at precipitation/between clarification unit and electrodialysis cell.Oil removal can be removed further by filter element and intercept big mechanical admixture, it is ensured that the water quality index such as float/bulky grain thing meet the influent quality requirement of follow-up electrodialysis cell.In one preferred embodiment, filter element includes one or more filter.This utility model is not particularly limited for the filtered version of filter, as long as being capable of filtering purpose, reaching water quality requirement, can be used for filtered version of the present utility model and including but not limited to fiber filter, sand media filtration, security personnel filtration, ultrafiltration, microfiltration etc..
In an embodiment according to processing system of the present utility model, processing system also includes regulating precipitation unit, before it is arranged at described precipitation/clarification unit, it is general when in pending desulfurization wastewater, suspension content is too high, such as larger than 5000mg/L, regulation precipitation unit is set, in order to carry out the float in desulfurization wastewater pending described in the regulation of water quantity and quality, preliminary sedimentation.
In an embodiment according to processing system of the present utility model, processing system also includes sludge treating block, and it is connected with described precipitation/clarification unit and/or described regulation precipitation unit, in order to process the precipitating sludge of gained.Device for sludge treating block can be this area existing any type sludge treatment equipment, includes but not limited to sheet frame sludge dehydration device etc..
nullIn a detailed description of the invention according to processing system of the present utility model,As shown in Figure 1,The processing system of desulfurization wastewater flows to include according to the waterpower of pending desulfurization wastewater: precipitation/clarification unit 1、Electrodialysis cell 2、NaCl produces Water Sproading unit 3,Include regulating precipitation unit 5 in the upstream of precipitation/clarification unit 1,Precipitation/include filter element 4 between clarification unit 1 and electrodialysis cell 2,Precipitation/clarification unit 1 is connected with regulation precipitation unit 5 sludge treating block 6,Wherein,Precipitation/clarification unit 1 is a sedimentation tank,Electrodialysis cell 2 is an electrodialysis plant,It is provided with homogeneous monovalention exchange membrane as electrodialytic membranes,It is a MVR evaporated crystallization device that NaCl produces Water Sproading unit 3,Filter element 4 includes sand filtering device and the ultrafiltration apparatus being sequentially connected,Regulation precipitation unit 5 is a sedimentation tank,Sludge treating block 6 is a sheet frame sludge dehydration device.
When processing system shown in Fig. 1 is run, pending desulfurization wastewater water inlet A initially enters regulation precipitation unit 5 and carries out precipitation process, the preliminary a large amount of float removed in water, regulation precipitation unit water outlet B enters precipitation/clarification unit 1, and the regulation precipitation unit mud C that precipitation produces enters sludge treating block 6.Add medicament D, medicament D and include Calx, sodium sulfate, heavy metal precipitator, flocculant and coagulant in precipitation/clarification unit 1, by the effect of medicament D, remove the most of impurity in desulfurization wastewater so that it is in mainly comprise NaCl and CaSO4, and precipitate, the precipitation/clarification unit mud E of precipitation gained neutralizes owing to pharmacy effect need to add acid H also into sludge treating block 6, precipitation/clarification unit water outlet G, carries out filter element 4 afterwards and process.Filter element 4 is by dual stage filter apparatus to remove float and mechanical admixture in water further, and filter element water outlet I enters electrodialysis cell 2, by the effect of homogeneous monovalention exchange membrane, is formed rich in the product water side of NaCl and rich in CaSO4Dense water side, produce water side containing NaCl produce water J carry out NaCl produce Water Sproading unit 3 be evaporated crystallization, dense water side containing CaSO4Dense water K may return to sulfur removal technology and recycled.NaCl obtains after producing Water Sproading unit 3 evaporative crystallization evaporating water L and crystal salt M, evaporation water L is supplemented to the product water side of electrodialysis cell 2 as fresh water, crystal salt M can recycle as acceptable industrial salt, this completes the processing procedure of desulfurization wastewater, achieve zero-emission, and achieve the efficient recovery of resource.
For coordinating processing system of the present utility model, the processing method of a kind of limestone/lime-gypsum method flue gas desulfurization waste-water can be used, comprise the following steps:
(1) feeding lime, sodium sulfate, heavy metal precipitator, flocculant and coagulant in pending desulfurization wastewater, precipitation, water outlet acid adding neutralizes;
(2) use homogeneous monovalention exchange membrane to carry out electrodialysis process the water outlet of step (1), formed and produce water and containing CaSO containing NaCl4Dense water, and reclaim respectively.
In step (1), heavy metal precipitator, flocculant, coagulant can select any kind that this area is common, and such as, available heavy metal precipitator includes but not limited to organic sulfur TMT15 etc.;Available flocculant includes but not limited to PAM etc.;Available coagulant includes but not limited to FeClSO4Deng.
After feeding lime, the chemical reaction by following for generation:
CO2+Ca(OH)2→CaCO3↓+H2O (1)
Ca(HCO3)2+Ca(OH)2→2CaCO3↓+2H2O (2)
MgSO4+Ca(OH)2→2Mg(OH)2↓+CaSO4 (3)
MgCl2+Ca(OH)2→2Mg(OH)2↓+CaCl2 (4)
CaCl2+2F-→CaF2↓+2Cl- (5)
2FeCl3+3Ca(OH)2→2Fe(OH)3↓+3CaCl2 (6)
Formula understands from the reactions above, after feeding lime processes, can be enriched with CaCl in waste water2, therefore need to add sodium sulfate and form NaCl with the chloride ion in coupling water.
In step (1), by the precipitation adding and adding after medicament of the medicaments such as Calx, sodium sulfate, TMT15, can realize calcium temporarily hard, magnesium is hard, colloidal silicon and the removal of non-colloid silicon, heavy metal, partial organic substances etc., it is not necessary to remove the hardest of deliming;Water outlet is directly entered subsequent treatment section, it is not necessary to concentrating, therefore without fouling risk, also without necessity of further advanced treating, dosing (such as sodium sulfate, heavy metal precipitator etc.) can obviously reduce, thus can reduce reagent cost and process costs.The water outlet of step (1) is alkalescence due to pharmacy effect, adds conventional hydrochloric acid or sulphuric acid is neutralized, can send into follow-up processing flow.The precipitating sludge of step (1) gained is discharged and is carried out Treatment of Sludge.
In step (2), electrodialytic ion exchange membrane uses homogeneous monovalention exchange membrane, this film has the high selective penetrated property to monovalention (such as NaCl), bivalence and multivalent ion (such as calcium sulfate) the most do not had permeability or extremely low permeability, then the separation of NaCl can be achieved (after step (1) processes by this electrodialytic membranes, mainly based on sodium chloride, calcium sulfate in desulfurization wastewater), formed and produce water and containing CaSO containing NaCl4Dense water, due to the separating effect that electrodialytic membranes is excellent, product water and the dense water of gained can reclaim respectively, thus realize zero-emission.
In step (1), Calx, sodium sulfate can add according to the usual manner of this area, as added continuously.In one embodiment, the dosing method of Calx is for add continuously, and the dosing method of sodium sulfate adds, as it was previously stated, described processing method makes the MgCl in desulfurization wastewater by feeding lime for interval2It is changed into CaCl2, it is subsequently adding sodium sulfate and makes it be changed into CaSO4, adding of sodium sulfate is to mate CaCl2, due to the undulatory property of desulfurization waste water quality, add sodium sulfate continuously just to mate CaCl2Being not easily accomplished in engineering, the dosing method of sodium sulfate is changed into interval and adds by the most described processing method, engineering is implemented convenient and operation is relatively reliable, and suitably leave a small amount of CaCl in water2The operation stability of desulfuration waste water treatment process is not interfered with yet.The interval dosing method of sodium sulfate can be determined according to practical sulphur removal waste water treatment process ruuning situation by those skilled in the art, and in general, the time-out interval added controls as CaSO in desulfurization wastewater4It is not up to its saturated fouled condition.
In step (1), the consumption of heavy metal precipitator is less than traditional handicraft consumption, in common desulfuration waste water treatment process, heavy metal in waste water is to be removed by feeding lime preliminary sedimentation, then add heavy metal precipitator and precipitate removal further, to meet the content of beary metal requirement being discharged into environment water.Processing method described in the utility model belongs to technique of zero discharge, waste water is not had to be discharged into environment water, therefore, the heavy metal precipitator used in processing method described in the utility model is only intended to remove other heavy metal class material that lime technology can not precipitate, thus consumption can obviously reduce, thus process costs can be reduced.
In step (2), containing NaCl produce water can not treated or through simple process be used as the raw material of industry.
In one embodiment, produce water containing NaCl to be reclaimed by evaporative crystallization, centrifugation due to electrodialytic membranes, the NaCl concentration produced in water containing NaCl is concentrated to higher concentration, the solid salt of evaporative crystallization gained can reach more than two grades of (sodium chloride >=92%/moisture content≤6%) standards of GB/T 5462-2003 Exposure to Sunlight Nacl, it is achieved that the resource recycling of solid waste.In one preferred embodiment, the NaCl concentration produced in water containing NaCl is concentrated into more than 120000mg/L, thus can reduce the water yield producing water side, to reduce scale and the operating cost of subsequent evaporation crystallization apparatus as far as possible.Another preferred embodiment in, evaporative crystallization obtains pure evaporation water simultaneously, is cooled to less than 60 DEG C, after meeting electrodialytic inflow temperature requirement, can be re-fed into electrodialytic product water side as water inlet, so can realize producing the closed cycle of water side.Due to electro-osmosis effect, the water yield producing water side also can slowly be accumulated, therefore, if evaporation water hypervolia, it is also possible to would arrange outward, maybe can send into dense water side to reduce fouling tendency.This utility model is not specially limited for the technique of evaporative crystallization, the existing evaporative crystallization technique in this area, includes but not limited to function of mechanical steam recompression technique (MVR), thermodynamic steam recompression technique (TVR), multiple-effect evaporation technique (MEE) etc..
Described electrodialysis step can need not add antisludging agent under normal operating conditions, and operating cost can reduce further.But, due to the salting-out effect of electrodialysis dense water side, the fouling tendency of calcium sulfate may be strengthened, now, the partial raw water moisturizing of wet desulfurizing process can be imported electrodialytic dense water side water inlet after filtering, with the salting-out effect that liquidates, it is possible to add antisludging agent in right amount.
In one embodiment; produce water containing NaCl to be reclaimed by electrolytic preparation NaClO; product quality can meet the inflow requirement of HJ/T 258 environmental protection product technology requirement-electrolysis hypochlorite generator; product NaClO solution can be sold as outside the disinfectant of electric power plant circulating water and/or commodity, achieves the resource recycling of solid waste equally.
In one embodiment, produce water containing NaCl also to recycle directly as the material liquid of chlor-alkali industry.
In one embodiment, step (2) gained containing CaSO4Dense Water Sproading is applied to wet desulfurizing process, is changed into Gypsum Fibrosum and finally realizes waste recovery.
In one embodiment, float preliminary sedimentation step, when suspension content is too high in pending desulfurization wastewater, such as larger than 5000mg/L is may also include before step (1), can first pass through this step tentatively to remove, the precipitating sludge of gained is discharged and is carried out Treatment of Sludge.
In one embodiment, one or multi-step filtration step is also included after step (1).Oil removal can be removed further by filtration step and intercept big mechanical admixture, it is ensured that the water quality index such as float/bulky grain thing meet follow-up electrodialytic influent quality requirement.Filtered version is not particularly limited, as long as being capable of filtering purpose, reaching water quality requirement, the filtered version that can be used for processing method includes but not limited to fiber filter, sand media filtration, security personnel filtration, ultrafiltration, microfiltration etc..
Embodiment: the process process pilot of certain coal-burning power plant's wet desulphurization waste water domestic
1. amount of inlet water: 2.5m3/h
2. flow condition:
TDS=30000mg/L, wherein NaCl=15000mg/L
3. exit condition:
Effluent quality NaCl≤3000mg/L;
Sheet frame desliming moisture content≤60%;
Crystal salt: more than two grades of (sodium chloride >=92%/moisture content≤6%) standards of GB/T 5462-2003 Exposure to Sunlight Nacl;
4. technological process:
Processing system with reference to shown in Fig. 1, technological process is as follows:
Tune heavy pond water: hybrid reaction sedimentation tank+multi-medium filtering+ultrafiltration+ED (monovalention selective membrane)+MVR evaporative crystallization.
Concrete technology process description is as follows:
From adjusting heavy pond to be lifted into hybrid reaction sedimentation tank through pump, add Calx Ca (OH)2PH is between 10~11 in control, is automatically adjusted chemical feeding quantity continuously.Sodium sulfate is that interval adds, and equivalent continuous dosage is about 2300mg/L, heavy metal precipitator TMT15 for add continuously, chemical feeding quantity about 1mg/L, coagulant FeClSO4Chemical feeding quantity is 14mg/L, and flocculant PAM chemical feeding quantity is 1mg/L.
Hybrid reaction sedimentation tank water outlet enters discharge bay, more medium filter and the pressure type ultrafiltration apparatus of series connection it is lifted into by pump, ultra-filtration water enters clear water reserviors, clear water water is lifted into electrodialysis plant through pump, sulfur removal technology serum recycle system is sent in the dense water water outlet of electrodialysis plant, produce the water outlet of water side and send into MVR evaporated crystallization device, draw solid crystal salt, be packed into industrial goods after drying.
5. systematic parameter:
5.1ED salt extraction part
Sequence number Title Parameter
1 Population parameter
Inflow 2.5m3/h
Remove the water yield after NaCl 2.42m3/h
Dense Aquatic product amount 0.32m3/h
Dense water salt content 120000mg/L
2 Capital equipment
ED film Current density~60A/m2;Active area~1250m2
ED film device 1 set
3 Ton water consumption With feed charging meter
Power consumption 14.2kw.h/m3
5.2MVR evaporative crystallization part
6. running effect
(1) desulfurization wastewater achieves zero-emission, and treatment effeciency is high;
(2) achieving the resource of solid waste, after evaporative crystallization, product gained is the industrial NaCl of substantially pure, all cannot obtain these rank industrial goods after the crystallization of existing technique of zero discharge direct evaporation;
(3) MVR evaporative crystallization achieves the closed cycle of water, does not consume water;
(4) invest low, operating cost is low;
(5) technological process is succinct, and operational management is convenient.
Although with reference to exemplary embodiment describing this utility model, it is to be understood that, term used is explanation and exemplary and nonrestrictive term.Owing to this utility model can be embodied as in a variety of forms without deviating from spirit of the present utility model or essence, so it should also be understood that, above-described embodiment is not limited to any aforesaid details, and should explain widely in the spirit and scope that claims are limited, therefore fall into the whole changes in claim or its equivalent scope and remodeling all should be claims and contained.

Claims (9)

1. the processing system of a limestone/lime-gypsum method flue gas desulfurization waste-water, it is characterised in that flow to include following processing unit successively by the waterpower of pending desulfurization wastewater:
Precipitation/clarification unit, for feeding lime, sodium sulfate, heavy metal precipitator, flocculant and coagulant and precipitate;
Electrodialysis cell, is provided with homogeneous monovalention exchange membrane, in order to make the water outlet of described precipitation/clarification unit produce water and containing CaSO by being formed after described homogeneous monovalention exchange membrane containing NaCl4Dense water;And
NaCl produces Water Sproading unit, described containing NaCl product water in order to reclaim.
Processing system the most according to claim 1, it is characterised in that described NaCl produces Water Sproading unit and includes evaporated crystallization device or electrolysis unit.
Processing system the most according to claim 2, it is characterised in that described evaporated crystallization device is selected from function of mechanical steam recompression device, thermodynamic steam recompression device or multi-effect evaporating device.
Processing system the most according to claim 1, it is characterised in that described precipitation/clarification unit includes potassium permanganate composites, horizontal sedimentation tank, inclined-plate clarifying basin or clarification concentration basin.
Processing system the most according to claim 1, it is characterised in that described electrodialysis cell includes direct electrodialysis plant or pole-reversing electroosmosis device.
Processing system the most according to claim 1, it is characterised in that described processing system also includes filter element, it is arranged at described precipitation/between clarification unit and described electrodialysis cell.
Processing system the most according to claim 6, it is characterised in that described filter element includes one or more filter, the filtered version of described filter is selected from fiber filter, sand media filtration, security personnel's filtration, ultrafiltration or microfiltration.
Processing system the most according to claim 1, it is characterised in that described processing system also includes regulating precipitation unit, before it is arranged at described precipitation/clarification unit, in order to the float in desulfurization wastewater pending described in regulating pondage water quality, preliminary sedimentation.
Processing system the most according to claim 8, it is characterised in that described processing system also includes sludge treating block, it is connected with described precipitation/clarification unit and/or described regulation precipitation unit, in order to process the precipitating sludge of gained.
CN201620159670.2U 2016-03-02 2016-03-02 Processing system of lime stone / lime - gypsum method flue gas desulfurization waste water Withdrawn - After Issue CN205575837U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105540960A (en) * 2016-03-02 2016-05-04 北京新源国能科技集团股份有限公司 Treatment method and treatment system for wastewater produced during flue gas desulfurization adopting limestone/lime-gypsum method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105540960A (en) * 2016-03-02 2016-05-04 北京新源国能科技集团股份有限公司 Treatment method and treatment system for wastewater produced during flue gas desulfurization adopting limestone/lime-gypsum method

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