CN105439358A - Method and device for realizing zero discharge of desulfurization wastewater - Google Patents
Method and device for realizing zero discharge of desulfurization wastewater Download PDFInfo
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- CN105439358A CN105439358A CN201511008707.8A CN201511008707A CN105439358A CN 105439358 A CN105439358 A CN 105439358A CN 201511008707 A CN201511008707 A CN 201511008707A CN 105439358 A CN105439358 A CN 105439358A
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- 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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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical 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
- C02F1/02—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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- 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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- 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
- C02F1/56—Macromolecular compounds
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- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2001/007—Processes including a sedimentation step
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- C02F2101/10—Inorganic compounds
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- 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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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
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Abstract
The invention provides a method and a device for realizing zero discharge of desulfurization wastewater and solves problems of the high energy consumption, the high dosage of chemical agents and the high cost in the prior art. The device for realizing zero discharge of the desulfurization wastewater comprises a pre-sedimentation unit, an adjusting unit, a primary flocculation and sedimentation unit, a softening unit, a secondary flocculation and sedimentation unit, an intermediate water tank unit, an evaporation and crystallization unit, two stages of sludge treatment units and a water producing tank, wherein the softening unit and two stages of flocculation and sedimentation units are arranged in front of the evaporation and crystallization unit so as to remove metal ions, F<-> and hardness of the desulfurization wastewater, water inlet requirements of the subsequent evaporation and crystallization unit are met, and the scaling tendency of the evaporation and crystallization unit is relieved. Meanwhile, the content of salt of the desulfurization wastewater is high, the evaporation and crystallization unit enables the salt of the desulfurization wastewater to form valuable industrial salt, and the desulfurization wastewater is recycled. The method and the device have the benefits as follows: the running cost is low, the energy consumption is low, the quality of produced water is good, the design is reasonable, scaling of the evaporation and crystallization unit is effectively prevented, and meanwhile, the desulfurization wastewater can be recycled.
Description
Technical field
The invention belongs to field of waste water treatment, refer to a kind of method and apparatus of desulfurization wastewater zero release especially.
Background technology
New " the water prevention and cure of pollution action plan " of promulgating of country proposes stricter requirement in industrial wastewater pollution control, raising water use efficiency, pollutant emission factor, environmental risk control etc., this just makes the key industrys such as coal, electric power, iron and steel, chemical industry need to widely popularize trade effluent recycle utilization, to reach the object of " zero release ".
" zero release " refer to ad infinitum decreasing pollution thing and can source emission until be zero activity, namely the trade effluent that produces in process of production of all kinds of enterprise can fully recovering after proper technology process, externally can not discharge any waste water in water body environment.And desulfurization wastewater mainly comprises suspended substance, oversaturated sulphite, vitriol, Cl
-, Mg
2+, F
-, heavy metal ion, nitrite and soluble calcium sulfate etc., have in acid, suspension content is high, heavy metal content is high, saltiness is high, corrodibility is strong, complicated component, intractability high.
At present, desulfurization wastewater technique of zero discharge relates to Chemical Pretreatment and two stages of advanced treatment.Although the Chemical Pretreatment stage can remove F in desulfurization wastewater
-, Ca
2+, Mg
2+with part heavy metal ion, but in its water outlet, saltiness is still very high, can cause corrosion to pipeline, and is discharged in natural water problems such as can causing water salinity rising, salting of soil, therefore needs to carry out advanced treatment to pretreated desulfurization wastewater.
In recent years, the technology applied in desulfurization wastewater zero release advanced treatment field both at home and abroad mainly contains membrane concentration technology and the large class of evaporative crystallization technique two.Wherein membrane concentration technology can remove the salt in desulfurization wastewater effectively, and effluent quality is good, but its cost of investment is higher, power consumption is higher, and desalting efficiency progressively can reduce along with the time, need after generally running certain hour to change membrane module, which increases cost of investment.And traditional evaporative crystallization technique generally adopts multiple-effect evaporator, although multiple-effect evaporator Technical comparing is ripe, range of application is wider, but the higher and secondary steam condensation that is that need a large amount of water of condensation to recycle of its energy consumption is got off, improve processing cost, simultaneously a large amount of in vaporizer latent heat also can run off along with secondary steam condensation.On the other hand, because multiple-effect evaporator needs a large amount of raw steam, start-stop car impacts comparatively large to whole factory public engineer system, and number of devices is many, and operational path is long, and operation relative complex, floor space is large.In sum, membrane concentration technology and traditional evaporative crystallization technique all come with some shortcomings in desulfurization wastewater zero discharge treatment process, therefore for the water quality characteristics of desulfurization wastewater, the method and apparatus exploring the new desulfurization wastewater zero release of exploitation has important Engineering Guidance meaning.
Summary of the invention
The present invention proposes a kind of method and apparatus of desulfurization wastewater zero release, overcome the problem that prior art cost of investment is high, energy consumption is high, calorific loss is high, complicated operation, floor space are large.
Technical scheme of the present invention is achieved in that
A device for desulfurization wastewater zero release, comprising:
(A) preliminary sedimentation unit, for removing large granular impurity in desulfurization wastewater and suspended substance;
(B) regulon, arranges aerating apparatus, for carrying out water quality and quantity adjustment and removing the COD of reducing property in desulfurization wastewater, is connected with described preliminary sedimentation unit;
(C) one-level flocculation sediment unit, for removing metal ion, SO in described pretreatment unit water outlet
4 2-and F
-, be connected with described regulon;
(D) pliable cell, goes out water hardness for reducing described one-level flocculation sediment unit and removes wherein remaining heavy metal ion, being connected with described one-level flocculation sediment unit;
(E) secondary flocculation sediment unit, removing the suspended substance in described pliable cell water outlet for accelerating, being connected with described pliable cell;
(F) intermediate pool unit, for collecting the water outlet of described secondary flocculation sediment unit, is connected with described secondary flocculation sediment unit;
(G) evaporative crystallization unit, for evaporating secondary flocculation sediment unit water outlet in described intermediate pool unit, obtaining crystalline solid and reuse water, being connected with described intermediate pool unit;
(H) producing water pot, for collecting the reuse water of described evaporative crystallization unit output, being connected with described evaporative crystallization unit;
(I) two-stage sludge treating block, is respectively used to the chemical sludge processing described preliminary sedimentation unit and the generation of two-stage flocculation sediment unit, is connected respectively with described preliminary sedimentation unit, one-level flocculation sediment unit and secondary flocculation sediment unit.
Further, the aerating apparatus in described equalizing tank is the one in gas blower, aeration plate, perforated pipe, Self-priming jet aeration device or microporous aeration device.
Further, described one-level chemical flocculation cell arrangement is one or more in reaction tank, flocculation basin, horizontal sedimentation tank or high efficiency clarification tank.
Further, described secondary chemical flocculation unit device is one or more in flocculation basin, tube settler or high efficiency clarification tank.
Further, described evaporated crystallization device is the one in multiple-effect evaporator (MEE), thermodynamic steam recompression (TVR) vaporizer or function of mechanical steam recompression (MVR) vaporizer, preferably, described evaporated crystallization device is function of mechanical steam recompression (MVR) vaporizer.
A method for desulfurization wastewater zero release, is characterized in that, comprises the following steps:
(A) desulfurization wastewater enters described preliminary sedimentation unit, removes large granular impurity and suspended substance in waste water;
(B) described preliminary sedimentation tank water outlet enters regulon, carries out the adjustment of water quality and quantity and remove in waste water the COD with reducing property under the effect of aerating apparatus;
(C) process of one-level flocculation sediment is carried out to described equalizing tank water outlet, in reaction tank, first add neutralizing agent to regulate wastewater pH and to remove metal ion, SO in waste water by precipitating action
4 2-and F
-, in flocculation basin, add flocculation agent/coagulant aids subsequently remove suspended substance in waste water further;
(D) sofening treatment is carried out to the water outlet of described one-level flocculation sediment unit, in reaction tank, add tenderizer reduce useless water hardness, add the cadmium of ionic state remaining in heavy metal trapping agent removal waste water, chromium, arsenic, lead, nickel and mercury to meet the inflow requirement of subsequent evaporation crystalline element simultaneously;
(E) water outlet of described pliable cell enters secondary flocculation sediment unit to reach the object removing suspended substance in pliable cell water outlet more quickly and efficiently;
(F) evaporative crystallization process is carried out to the high slat-containing wastewater that described secondary flocculation sediment unit produces, evaporative crystallization unit gained solid forms Industrial Salt crystalline solid and can be used for reuse or sale after centrifugal drying device dehydration, and evaporative crystallization unit produces water and enters in product water pot for the production of reuse;
(G) chemical sludge that described preliminary sedimentation unit and one-level flocculation sediment unit produce enters in the mud storage pond of one-level sludge treating block, the chemical sludge that described secondary flocculation sediment unit produces enters in the mud storage pond of secondary sludge processing unit, mud forms mud cake and arranges outward after chamber-type press filter dehydration in two-stage sludge treating block, and filtrate is back to regulon and pliable cell respectively.
Further, the neutralizing agent added in the reaction tank of described one-level flocculation sediment unit is one or both in unslaked lime or milk of lime; Flocculation agent/the coagulant aids added in flocculation basin is one or more in bodied ferric sulfate, poly-phosphorus iron(ic) chloride, polymerize aluminum chloride, polyacrylamide, sodium alginate, activated silicic acid.
Further, the tenderizer added in described pliable cell is sodium carbonate; The metal trapping agent added is one or more in sodium sulphite, potassium sulphide, Iron sulfuret, organic sulfide.
Further, the flocculation agent/coagulant aids added in the flocculation basin of described secondary flocculation sediment unit is one or more in bodied ferric sulfate, poly-phosphorus iron(ic) chloride, polymerize aluminum chloride, polyacrylamide, sodium alginate, activated silicic acid.
Beneficial effect of the present invention is:
(1) method and apparatus of desulfurization wastewater zero release of the present invention, combines chemical tendering, flocculation sediment process with evaporative crystallization technique, effectively can remove metal ion, SO in waste water flocculation sediment treatment stage
4 2-and F
-and reduce useless water hardness, the steady running for subsequent evaporation crystallization apparatus provides good basis.
(2) the present invention preferably adopts the waste water of function of mechanical steam recompression (MVR) vaporizer process after pliable cell and two-stage chemical flocculation cell processing.MVR vaporizer adopts electricity to be heated up, boost to drive evaporation and crystal process by secondary steam, this technology can not produce unnecessary secondary steam as traditional multiple-effect evaporator, avoid the latent heat comprised in large losses secondary steam, do not need to consume distilled water required in cooling secondary steam condensation process simultaneously, eliminate the cost of investment of water coolant yet; On the other hand, MVR vaporizer overcomes multiple-effect evaporator start-stop car and impacts large shortcoming to whole factory public engineer system, and number of devices is few, operational path is short, easy and simple to handle, floor space is little.
(3) method and apparatus of desulfurization wastewater zero release of the present invention, the crystalline solid obtained can be used as Industrial Salt reuse or sale, and whole process, without concentrated water discharge, really reaches the object of wastewater zero discharge.
(4) method and apparatus of desulfurization wastewater zero release of the present invention, removes metal ion, SO in waste water
4 2-and F
-deng, water outlet can be back to industrial production.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the precursor not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structured flowchart of the device of a kind of desulfurization wastewater zero release of the present invention;
Fig. 2 is the flow chart of steps of the method for a kind of desulfurization wastewater zero release of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, the device of a kind of desulfurization wastewater zero release of the present invention, comprising:
(A) preliminary sedimentation unit, for removing large granular impurity in desulfurization wastewater and suspended substance;
(B) regulon, arranges aerating apparatus, for carrying out water quality and quantity adjustment and removing the COD of reducing property in desulfurization wastewater, is connected with described preliminary sedimentation unit;
(C) one-level flocculation sediment unit, for removing metal ion, SO in described pretreatment unit water outlet
4 2-and F
-, be connected with described regulon;
(D) pliable cell, goes out water hardness for reducing described one-level flocculation sediment unit and removes wherein remaining heavy metal ion, being connected with described one-level flocculation sediment unit;
(E) secondary flocculation sediment unit, removing the suspended substance in described pliable cell water outlet for accelerating, being connected with described pliable cell;
(F) intermediate pool unit, for collecting the water outlet of described secondary flocculation sediment unit, is connected with described secondary flocculation sediment unit;
(G) evaporative crystallization unit, for evaporating secondary flocculation sediment unit water outlet in described intermediate pool unit, obtaining crystalline solid and reuse water, being connected with described intermediate pool unit;
(H) producing water pot, for collecting the reuse water of described evaporative crystallization unit output, being connected with described evaporative crystallization unit;
(I) two-stage sludge treating block, is respectively used to the chemical sludge processing described preliminary sedimentation unit and the generation of two-stage flocculation sediment unit, is connected respectively with described preliminary sedimentation unit, one-level flocculation sediment unit and secondary flocculation sediment unit.
Preferably, the aerating apparatus in described equalizing tank is the one in gas blower, aeration plate, perforated pipe, Self-priming jet aeration device or microporous aeration device.
Preferably, described one-level chemical flocculation cell arrangement is one or more in reaction tank, flocculation basin, horizontal sedimentation tank or high efficiency clarification tank.
Preferably, described secondary chemical flocculation unit device is one or more in flocculation basin, tube settler or high efficiency clarification tank.
Preferably, described evaporated crystallization device is the one in multiple-effect evaporator (MEE), thermodynamic steam recompression (TVR) vaporizer or function of mechanical steam recompression (MVR) vaporizer, optimally, described evaporated crystallization device is function of mechanical steam recompression (MVR) vaporizer.
As shown in Figure 2, present invention also offers a kind of method of desulfurization wastewater zero release, comprise the following steps:
(A) desulfurization wastewater enters described preliminary sedimentation unit, removes large granular impurity and suspended substance in waste water;
(B) described preliminary sedimentation tank water outlet enters regulon, carries out the adjustment of water quality and quantity and remove in waste water the COD with reducing property under the effect of aerating apparatus;
(C) process of one-level flocculation sediment is carried out to described equalizing tank water outlet, in reaction tank, first add neutralizing agent to regulate wastewater pH and to remove metal ion, SO in waste water by precipitating action
4 2-and F
-, in flocculation basin, add flocculation agent/coagulant aids subsequently remove suspended substance in waste water further;
(D) sofening treatment is carried out to the water outlet of described one-level flocculation sediment unit, in reaction tank, add tenderizer reduce useless water hardness, add the cadmium of ionic state remaining in heavy metal trapping agent removal waste water, chromium, arsenic, lead, nickel and mercury to meet the inflow requirement of subsequent evaporation crystalline element simultaneously;
(E) water outlet of described pliable cell enters secondary flocculation sediment unit to reach the object removing suspended substance in pliable cell water outlet more quickly and efficiently;
(F) evaporative crystallization process is carried out to the high slat-containing wastewater that described secondary flocculation sediment unit produces, evaporative crystallization unit gained solid forms Industrial Salt crystalline solid and can be used for reuse or sale after centrifugal drying device dehydration, and evaporative crystallization unit produces water and enters in product water pot for the production of reuse;
(G) chemical sludge that described preliminary sedimentation unit and one-level flocculation sediment unit produce enters in the mud storage pond of one-level sludge treating block, the chemical sludge that described secondary flocculation sediment unit produces enters in the mud storage pond of secondary sludge processing unit, mud forms mud cake and arranges outward after chamber-type press filter dehydration in two-stage sludge treating block, and filtrate is back to regulon and pliable cell respectively.
Preferably, the neutralizing agent added in the reaction tank of described one-level flocculation sediment unit is one or both in unslaked lime or milk of lime; Flocculation agent/the coagulant aids added in flocculation basin is one or more in bodied ferric sulfate, poly-phosphorus iron(ic) chloride, polymerize aluminum chloride, polyacrylamide, sodium alginate, activated silicic acid.
Preferably, the tenderizer added in described pliable cell is sodium carbonate; The metal trapping agent added is one or more in sodium sulphite, potassium sulphide, Iron sulfuret, organic sulfide.
Preferably, the flocculation agent/coagulant aids added in the flocculation basin of described secondary flocculation sediment unit is one or more in bodied ferric sulfate, poly-phosphorus iron(ic) chloride, polymerize aluminum chloride, polyacrylamide, sodium alginate, activated silicic acid.
The method and apparatus of desulfurization wastewater zero release of the present invention, has the following advantages:
(1) method and apparatus of desulfurization wastewater zero release of the present invention, combines chemical tendering, flocculation sediment process with evaporative crystallization technique, effectively can remove metal ion, SO in waste water flocculation sediment treatment stage
4 2-and F
-and reduce useless water hardness, the steady running for subsequent evaporation crystallization apparatus provides good basis.
(2) the present invention preferably adopts the waste water of function of mechanical steam recompression (MVR) vaporizer process after pliable cell and two-stage chemical flocculation cell processing.MVR vaporizer adopts electricity to be heated up, boost to drive evaporation and crystal process by secondary steam, this technology can not produce unnecessary secondary steam as traditional multiple-effect evaporator, avoid the latent heat comprised in large losses secondary steam, do not need to consume distilled water required in cooling secondary steam condensation process simultaneously, eliminate the cost of investment of water coolant yet; On the other hand, MVR vaporizer overcomes multiple-effect evaporator start-stop car and impacts large shortcoming to whole factory public engineer system, and number of devices is few, operational path is short, easy and simple to handle, floor space is little.
(3) method and apparatus of desulfurization wastewater zero release of the present invention, the crystalline solid obtained can be used as Industrial Salt reuse or sale, and whole process, without concentrated water discharge, really reaches the object of wastewater zero discharge.
(4) method and apparatus of desulfurization wastewater zero release of the present invention, removes metal ion, SO in waste water
4 2-and F
-deng, water outlet can be back to industrial production.
Below enumerate several example so that effect of the present invention to be described, but the right of invention is not limited only to this.
Embodiment 1 is Hebei power plant smoke desulfurization by wet method wastewater zero discharge and recycling treatment process, former water Cl
-, Ca
2 +, Mg
2+, SO
4 2-, NO
3 -, SiO
2, fluorochemical and concentration of suspension be respectively 12000,1618.5,5380,8000,300,250,125 and 4000mg/L and containing a small amount of heavy metal ion.Desulfurization wastewater Ca in water after chemical tendering and the process of two-stage flocculation sediment
2+, Mg
2+, SiO
2, fluorochemical, SO
4 2-reach 98.6%, 96.9%, 93.5%, 88%, 90% and 99.5 respectively with the clearance of suspended substance, reach the inflow requirement of MVR vaporizer.The water outlet of secondary flocculation sediment unit enters MVR vaporizer and carries out evaporative crystallization, and the distilled water that vaporizer produces is Cl
-and NO
3 -concentration is less than the fresh water of 200 and 100mg/L respectively and is back in the daily production process of power plant, and the solid that vaporizer produces is met the Industrial Salt that industrial production needs after centrifugal drying.
Embodiment 2 is Hubei power plant smoke desulfurization by wet method wastewater zero discharge and recycling treatment process, former water Cl
-, Ca
2 +, Mg
2+, SO
4 2-, NO
3 -, SiO
2, fluorochemical and concentration of suspension be respectively 16000,1000,4000,4000,250,180,100 and 3500mg/L and containing a small amount of heavy metal ion.Desulfurization wastewater Ca in water after chemical tendering and the process of two-stage flocculation sediment
2+, Mg
2+, SiO
2, fluorochemical, SO
4 2-reach 99%, 98%, 95%, 90%, 91% and 100% respectively with the clearance of suspended substance, reach the inflow requirement of MVR vaporizer.The water outlet of secondary flocculation sediment unit enters MVR vaporizer and carries out evaporative crystallization, and the distilled water that vaporizer produces is Cl
-and NO
3 -concentration is less than the fresh water of 300 and 100mg/L respectively and is back in the daily production process of power plant, and the solid that vaporizer produces is met the Industrial Salt that industrial production needs after centrifugal drying.
The above is because preferred embodiment of the present invention, and not in order to limit the present invention, all within the spirit and principles in the present invention, any amendment, substitute equivalents, improvement etc. done, within all should being included in protection scope of the present invention.
Claims (6)
1. a device for desulfurization wastewater zero release, is characterized in that, comprising:
(A) preliminary sedimentation unit, for removing large granular impurity in desulfurization wastewater and suspended substance;
(B) regulon, arranges aerating apparatus, for carrying out water quality and quantity adjustment and removing the COD of reducing property in desulfurization wastewater, is connected with described preliminary sedimentation unit;
(C) one-level flocculation sediment unit, for removing metal ion, SO in described pretreatment unit water outlet
4 2-and F
-, be connected with described regulon;
(D) pliable cell, goes out water hardness for reducing described one-level flocculation sediment unit and removes wherein remaining heavy metal ion, being connected with described one-level flocculation sediment unit;
(E) secondary flocculation sediment unit, removing the suspended substance in described pliable cell water outlet for accelerating, being connected with described pliable cell;
(F) intermediate pool unit, for collecting the water outlet of described secondary flocculation sediment unit, is connected with described secondary flocculation sediment unit;
(G) evaporative crystallization unit, for evaporating secondary flocculation sediment unit water outlet in described intermediate pool unit, obtaining crystalline solid and reuse water, being connected with described intermediate pool unit;
(H) producing water pot, for collecting the reuse water of described evaporative crystallization unit output, being connected with described evaporative crystallization unit;
(I) two-stage sludge treating block, is respectively used to the chemical sludge processing described preliminary sedimentation unit and the generation of two-stage flocculation sediment unit, is connected respectively with described preliminary sedimentation unit, one-level flocculation sediment unit and secondary flocculation sediment unit.
2. the device of desulfurization wastewater zero release according to claim 1, it is characterized in that, described evaporated crystallization device is the one in multiple-effect evaporator (MEE), thermodynamic steam recompression (TVR) vaporizer or function of mechanical steam recompression (MVR) vaporizer.
3. a method for desulfurization wastewater zero release, is characterized in that, comprises the following steps:
(A) desulfurization wastewater enters described preliminary sedimentation unit, removes large granular impurity and suspended substance in waste water;
(B) described preliminary sedimentation tank water outlet enters regulon, carries out the adjustment of water quality and quantity and remove in waste water the COD with reducing property under the effect of aerating apparatus;
(C) process of one-level flocculation sediment is carried out to described equalizing tank water outlet, in reaction tank, first add neutralizing agent to regulate wastewater pH and to remove metal ion, SO in waste water by precipitating action
4 2-and F
-, in flocculation basin, add flocculation agent/coagulant aids subsequently remove suspended substance in waste water further;
(D) sofening treatment is carried out to the water outlet of described one-level flocculation sediment unit, in reaction tank, add tenderizer reduce useless water hardness, add the cadmium of ionic state remaining in heavy metal trapping agent removal waste water, chromium, arsenic, lead, nickel and mercury to meet the inflow requirement of subsequent evaporation crystalline element simultaneously;
(E) water outlet of described pliable cell enters secondary flocculation sediment unit to reach the object removing suspended substance in pliable cell water outlet more quickly and efficiently;
(F) evaporative crystallization process is carried out to the high slat-containing wastewater that described secondary flocculation sediment unit produces, evaporative crystallization unit gained solid forms Industrial Salt crystalline solid and can be used for reuse or sale after centrifugal drying device dehydration, and evaporative crystallization unit produces water and enters in product water pot for the production of reuse;
(G) chemical sludge that described preliminary sedimentation unit and one-level flocculation sediment unit produce enters in the mud storage pond of one-level sludge treating block, the chemical sludge that described secondary flocculation sediment unit produces enters in the mud storage pond of secondary sludge processing unit, mud forms mud cake and arranges outward after chamber-type press filter dehydration in two-stage sludge treating block, and filtrate is back to regulon and pliable cell respectively.
4. the method for desulfurization wastewater zero release according to claim 3, is characterized in that, also comprise: the neutralizing agent added in the reaction tank of described one-level flocculation unit unit is one or both in unslaked lime or milk of lime; Flocculation agent/the coagulant aids added in flocculation basin is one or more in bodied ferric sulfate, poly-phosphorus iron(ic) chloride, polymerize aluminum chloride, polyacrylamide, sodium alginate, activated silicic acid.
5. the method for desulfurization wastewater zero release according to claim 3, is characterized in that, also comprise: the tenderizer added in described pliable cell is sodium carbonate; The metal trapping agent added is one or more in sodium sulphite, potassium sulphide, Iron sulfuret, organic sulfide.
6. the method for desulfurization wastewater zero release according to claim 3, it is characterized in that, also comprise, the flocculation agent/coagulant aids added in the flocculation basin of described secondary flocculation unit unit is one or more in bodied ferric sulfate, poly-phosphorus iron(ic) chloride, polymerize aluminum chloride, polyacrylamide, sodium alginate, activated silicic acid.
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