CN107285489A - A kind of device and method of desulfurization wastewater pretreatment - Google Patents
A kind of device and method of desulfurization wastewater pretreatment Download PDFInfo
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- CN107285489A CN107285489A CN201710623483.4A CN201710623483A CN107285489A CN 107285489 A CN107285489 A CN 107285489A CN 201710623483 A CN201710623483 A CN 201710623483A CN 107285489 A CN107285489 A CN 107285489A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 120
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 61
- 230000023556 desulfurization Effects 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 38
- 125000001741 organic sulfur group Chemical group 0.000 claims abstract description 30
- RQPZNWPYLFFXCP-UHFFFAOYSA-L barium dihydroxide Chemical compound [OH-].[OH-].[Ba+2] RQPZNWPYLFFXCP-UHFFFAOYSA-L 0.000 claims abstract description 23
- 229910001863 barium hydroxide Inorganic materials 0.000 claims abstract description 23
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims abstract description 12
- 159000000009 barium salts Chemical class 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims description 25
- 238000004062 sedimentation Methods 0.000 claims description 16
- 238000007599 discharging Methods 0.000 claims description 11
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 10
- 238000005189 flocculation Methods 0.000 claims description 10
- 230000016615 flocculation Effects 0.000 claims description 10
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 9
- 239000000725 suspension Substances 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 238000002425 crystallisation Methods 0.000 abstract description 12
- 230000008025 crystallization Effects 0.000 abstract description 6
- 239000010802 sludge Substances 0.000 description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 18
- 229910001385 heavy metal Inorganic materials 0.000 description 14
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 description 11
- 229910001626 barium chloride Inorganic materials 0.000 description 11
- 208000028659 discharge Diseases 0.000 description 11
- 239000003814 drug Substances 0.000 description 11
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 8
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 6
- 230000001376 precipitating effect Effects 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 6
- 238000013019 agitation Methods 0.000 description 5
- 239000006228 supernatant Substances 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 235000017550 sodium carbonate Nutrition 0.000 description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000005273 aeration Methods 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 235000011116 calcium hydroxide Nutrition 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910052602 gypsum Inorganic materials 0.000 description 3
- 239000010440 gypsum Substances 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 238000007781 pre-processing Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 241000370738 Chlorion Species 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical class OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910001422 barium ion Inorganic materials 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000007348 radical reaction Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical class [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
- C02F5/02—Softening water by precipitation of the hardness
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- 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
Abstract
The present invention provides a kind of device of desulfurization wastewater pretreatment.Including flowing to what is set along desulfurization wastewater：First-stage reactor, adds unit and an organic sulfur provided with a barium hydroxide or sulfide adds unit；Second reactor, unit is added provided with barium salt.By optimizing the softening pretreatment process method that desulfurization wastewater is evaporated before crystallization, the cost that desulfurization wastewater is handled using evaporative crystallization method can be effectively reduced.A kind of device is separately provided, organic sulfur or sulfide are added into unit and barium salt adds the position exchange of unit.The method that the desulfurization wastewater pretreatment implemented based on above two device is provided simultaneously.
Description
Technical field
The invention belongs to environmental protection technical field, and in particular to a kind of device and method of desulfurization wastewater pretreatment.
Background technology
Coal fired power generation occupies critical role in China's energy resource supply.For environment protection, China is most in recent years
Number power plant employs Limestone-gypsum Wet Flue Gas Desulfurization Process technology, to remove the sulfur dioxide in flue gas.Coal-burning power plant's wet desulphurization
Waste component is complicated, contains high concentration suspended matter, oversaturated sulphite, chlorion, sulfate and various heavy.Mesh
Preceding desulfurization wastewater is mainly handled using chemical precipitation method, part index number difficulty up to standard, even if after processing up to standard, due to big in waste water
The presence of the sulfate and chloride of amount, water outlet salt content is still up to 2%~4%, it is difficult to reuse, can also cause after outer row
Surface water and soil ecology are broken, cause secondary pollution.Therefore, the exploitation of desulfurization wastewater zero discharge treatment technology is increasingly by weight
Depending on.
In a variety of developing ways of desulfurization wastewater Zero-discharge treating process, evaporative crystallization method is current research staff in the industry
The main process of concern.Although can largely reduce the water outlet after desulfurization wastewater processing on evaporative crystallization law theory
Salt content, even up to near-zero release standard brick, but in industrial practice, existed using evaporative crystallization method and unavoidably existed
Shortcoming.
Shortcoming is mainly reflected in following two aspects：
First is that evaporative crystallization cost is high, needs to consume the substantial amounts of energy, therefore, operating cost using evaporative crystallization technique
It is high；Second, minimizing processing is carried out to waste water using membrane separation techniques such as counter-infiltrations first, the concentrated water that UF membrane is produced is entered again
Row evaporative crystallization, can effectively reduce evaporation process load and save processing cost.But needed when using the membrane treatment process such as RO
Strict pretreatment is carried out to waste water, because calcium and magnesium concentration is high in waste water, calcium sulfate is in hypersaturated state, causes softening pre-
Processing cost is high, general up to 15~30 yuan/ton, and substantial amounts of precipitating sludge can be also produced in preprocessing process, additionally
Increase the processing cost of precipitating sludge.
In order to reduce desulfurization wastewater zero discharge treatment cost, evaporative crystallization method processing desulfurization wastewater technique is promoted, in view of existing
The shortcoming and defect of desulfurization wastewater technique of zero discharge is deposited, the desulfurization wastewater preprocess method of developing low-cost is most important.
The content of the invention
In view of the above-mentioned problems, it is an object of the invention to provide a kind of device and method of desulfurization wastewater pretreatment.By excellent
Change the softening pretreatment process method that desulfurization wastewater is evaporated before crystallization, can effectively reduce de- using the processing of evaporative crystallization method
The cost of sulphur waste water.
For up to above-mentioned purpose, the present invention is adopted the technical scheme that：
A kind of device of desulfurization wastewater pretreatment, including flow to what is set along desulfurization wastewater：
First-stage reactor, adds unit and an organic sulfur provided with a barium hydroxide or sulfide adds unit；
Second reactor, unit is added provided with barium salt.
Further, in addition to the preliminary sedimentation tank that is arranged between first-stage reactor and second reactor；It is arranged at two grades instead
Answer the second pond in device downstream.
Further, in addition to it is arranged at the pretreatment system of first-stage reactor upstream.
Further, the pretreatment system includes COD processing units and/or suspension processing unit.
Further, the first-stage reactor and second reactor are equipped with agitating unit.Agitating unit can be machinery
Formula agitating unit, it would however also be possible to employ aeration agitation unit.
Further, the first-stage reactor includes the first reaction member and the second reaction member, and barium hydroxide adds list
Member is located at the first reaction member, and organic sulfur or sulfide add unit located at the second reaction member.
Further, between the first-stage reactor and preliminary sedimentation tank, it is equipped with flocculation between second reactor and second pond
Reaction member.
Further, the bottom of the preliminary sedimentation tank and second pond is respectively provided with mud discharging mouthful.
A kind of device of desulfurization wastewater pretreatment, including flow to what is set along desulfurization wastewater：
First-stage reactor, adds unit provided with a barium hydroxide and a barium salt adds unit；
Second reactor, unit is added provided with an organic sulfur or sulfide.
A kind of method of desulfurization wastewater pretreatment, comprises the following steps：
Barium hydroxide is added into desulfurization wastewater, pH value of waste water is adjusted to 8.5-10；Then organic sulfur or sulfide are added,
Carry out except reacting and removing part of sulfuric acid root again, obtain except weight waste water；
Barium salt is added in except weight waste water, is removed except remaining sulfate ion in weight waste water.
A kind of method of desulfurization wastewater pretreatment, comprises the following steps：
Barium hydroxide is added into desulfurization wastewater, pH value of waste water is adjusted to 8.5-10；Then barium salt is added, is carried out except weight is anti-
Part of sulfuric acid root and should be removed, is obtained except weight waste water；
Organic sulfur or sulfide are added in except weight waste water, is removed except remaining sulfate ion in weight waste water.
By taking the route of demagging simultaneously and deliming in above-mentioned technical proposal, abandoning tradition sofening treatment of the present invention, adopt
Combine the method removed weight and remove sulfate radical with barium hydroxide and barium chloride, while heavy metal in waste water is removed, effectively keep away
Exempt from the calcium sulfate scaling problem in follow-up Waste water concentrating processing, with technique is simple, added amount of chemical is few, operating cost is low, dirt
Mud yield is few and is easy to the advantage that is combined with other techniques.Especially adapt to the processing for high-chlorine and high-calcium desulfurization wastewater.And
And due to dosing can be reduced, the cost of desulfurization wastewater softening pretreatment can be greatly reduced, is conducive to evaporative crystallization method
The technique for handling desulfurization wastewater is promoted.
Brief description of the drawings
Fig. 1 is the schematic device of desulfurization wastewater pretreatment in one embodiment of the invention.
Fig. 2 is its arrangement schematic diagram of first order reaction in another embodiment of the present invention.
Description of reference numerals：1- first-stage reactors, 2- preliminary sedimentation tanks, 3- mud dischargings mouth, 4- second reactors, 5- bis- sink
Pond, 6- mud dischargings mouthful.
Embodiment
The present invention will be further described with embodiment with reference to the accompanying drawings and detailed description.
As shown in figure 1, in one embodiment there is provided desulfurization wastewater processing device, it flows to cloth according to desulfurization wastewater
Put as follows：Including first-stage reactor 1, preliminary sedimentation tank 2, second reactor 4, second pond 5, the bottom difference of preliminary sedimentation tank 2 and second pond 6
Mud discharging mouthful 3 and mud discharging mouthful 6 are set.By setting preliminary sedimentation tank and second pond that heavy metal sewage sludge can be separated to independent place
Reason, advantageously reduces Treatment of Sludge cost.
In not shown embodiment, desulfurization wastewater can enter back into reactor 1 after appropriate pretreatment.Pretreatment system
System can be pre-processed using one or more of processing methods such as COD processing, suspension processing are included to desulfurization wastewater, pre- place
The process requirements and desulfurization wastewater composition that the processing method that the choice of reason and specific pretreatment are used can combine reality adjust,
It will not be repeated here, can be considered the common processing mode of desulfurization wastewater, unnecessarily associated with the application core purport.
As schemed, first-stage reactor 1 is provided with stirring system, can use mechanical agitation, it would however also be possible to employ aeration agitation, be used for
Ensure that water quality is uniform in reactor.
First-stage reactor 1 is provided with adding of agent system, and medicament A and B are respectively barium hydroxide and organic sulfur, useless for removing
Heavy metal and part of sulfuric acid root in water.Organic sulfur is mainly the removal of mercury, it would however also be possible to employ vulcanized sodium sulfides, but organic sulfur
Application effect is good, it is easy to operate, and other heavy metals are mainly removed by barium hydroxide, and order of adding is necessary for after A elder generations B, because
Organic sulfur also can remove other heavy metals, but organic sulfur price is very expensive.
In a further embodiment, first-stage reactor may be arranged as double-reactor as shown in Figure 2, and medicine is added successively
Agent A and medicament B, is respectively used to carry out barium hydroxide except reaction and organic sulfur again are except reacting again.
In addition, flocculation reaction system can be arranged as required between first-stage reactor 1 and preliminary sedimentation tank 2, to improve sludge
Sedimentation effect.Flocculation reaction medicament is similarly known, will not be repeated here.
The sludge of the discharge of mud discharging mouthful 3 is after dehydrating, further disposal；The sludge of the discharge of mud discharging mouthful 6
Deliver to Desulfurization tower slurry or drain into gypsum dehydration machine.
Stirring system and medicament addition device are again provided with second reactor 4.
Stirring system can use mechanical agitation, it would however also be possible to employ aeration agitation, for ensureing that water quality is uniform in reactor；
And medicament C is barium salt, preferably barium chloride, the sulfate radical for removing waste water residual.
Flocculation reaction system can be arranged as required between second reactor 4 and second pond 5, to improve sludge settling effect
Rate.
The method that desulfurization wastewater pretreatment is carried out using said apparatus, can specifically be achieved by the steps of：
Desulfurization wastewater initially enters first-stage reactor 1, barium hydroxide and organic sulfur medicament is added into reactor, by waste water
PH is adjusted to 9.5 or so, heavy metal in waste water is generated Precipitation, while part sulfate radical is combined to form with barium ions in waste water
Barium sulfate precipitate.Above-mentioned pH adjusted values are preferred value under certain condition, indeed, it is possible to as needed by the adjustment of pH value
Scope is arranged on 8.5 to 10.
The water outlet of first-stage reactor 1 enters in preliminary sedimentation tank 2, under gravity, realizes mud-water separation, and the sludge of generation leads to
The discharge of mud discharging mouthful 3 is crossed after dehydrating, further disposal, supernatant enters in second reactor 4.
In order to improve sludge settling performance, flocculated before preliminary sedimentation tank 2 can be entered from first-stage reactor 1 with desulfurization wastewater
Reaction.
Add barium salt into second reactor 4, preferably barium chloride, make sulfate radical in waste water reaction generation barium sulfate, will
Sulfate radical is reduced to required level, it is ensured that will not substantially fouling in the processing of waste water subsequent concentration.
The water outlet of second reactor 4 enters in second pond 5, and after mud-water separation, supernatant is further disposed, second pond
The sludge produced in 5 goes to Desulfurization tower slurry by the discharge of mud discharging mouthful 6 or drains into gypsum dehydration machine.
Likewise it is possible to set flocculation reaction system between second reactor 4 and second pond 5.
The above method can be adjusted, and device also does accommodation：Scheme is as follows：
Desulfurization wastewater initially enters first-stage reactor, and barium hydroxide and barium chloride medicament are added into reactor, is rationally set
The dosage of two kinds of medicaments is put, wastewater pH is adjusted to 9.5 or so, heavy metal in waste water is generated Precipitation, while by waste water
Middle part sulfate radical reaction generation barium sulfate precipitate, makes sulfate radical in waste water be reduced to target level.Barium chloride dosage according to
Subsequent concentration technique needs, and flexibly determines, mainly controls sulfate concentration remaining in waste water.
Equally can according to actual needs, desulfurization wastewater can enter back into first-stage reactor after appropriate pretreatment.
The water outlet of first-stage reactor can be directly entered in second reactor.
Organic sulfur is added into second reactor, the heavy metals such as Mercury in Wastewater are further removed.
The water outlet of second reactor enters in second pond, and after mud-water separation, supernatant is further disposed, in second pond
The sludge that the sludge of generation is produced by mud discharging mouthful carries out subsequent treatment.
Below by actual experimentation, the feasibility and superiority of the device and method of the application are verified.Tested
Journey is as follows：
Certain power plant's practical sulphur removal waste water is taken, raw water pH is concentration of suspension about 20000mg/L in 6.8, waste water, is passed through first
Simple filtration removes the suspension in waste water, and the calcium ion content in waste water is about 2600mg/L, and magnesium ion is 600mg/L,
Sulfate concentration is 1000mg/L.It should be noted that heavy metal processing is conventional meanses in desulfurization wastewater processing, it is not this
Apply for the emphasis of concern, the application focuses on entirely pre-processing cost, therefore does not provide content of beary metal herein.Next respectively
Carry out following two groups of experiments：
Experiment one, using conventional pretreatment technique, i.e. milk of lime+organic sulfur+soda ash tenderizer, first to 1000mL waste water
Wastewater pH is modulated 11.5 by the middle milk of lime (mass concentration is 5% suspension) that adds, while being stirred to waste water, it is ensured that anti-
Should be fully and uniform, after reaction 15min, organic sulfur and sodium carbonate (mass concentration is 10% solution) are then added into waste water,
Magnesium ion in waste water produces magnesium hydrate precipitate and entered in sludge, and waste water passes through calcium ion in flocculation sediment processed waste water
Concentration is reduced to 20mg/L, and then heavy metal in waste water qualified discharge adds hydrochloric acid and wastewater pH is pulled back into 9.5, as a result show
Added amount of chemical is milk of lime 4.0g/L, organic sulfur 50mg/L, soda ash 10.40g/L, and salt acid consumption is 3g/L.According to market
Price, hydrochloric acid (30%), lime, organic sulfur (100%) and soda ash are respectively 300,500,120000 and 1500 yuan/ton, required
Medicament totle drilling cost is about 24.1 yuan/ton.After measured, (sedimentation time is 20 minutes), precipitating sludge cumulative volume after two-stage precipitation
About 230mL.Waste water after processing can meet film concentration water inlet hardness requirement.
Experiment two：Using the technique in the present invention, waste water is after preliminary filtering removes most suspended substances, to 1000mL
Barium hydroxide solution (mass concentration 2%) is added in waste water, wastewater pH is adjusted to 9.5, organic sulfur solution, reaction is then added
After 10min, added into waste water after flocculant and flocculation aid reaction 5min, determine sludge volume after static 15 minutes, then will
Added after waste water filtering into filtrate after barium chloride, reaction 10min, flocculant and flocculation aid reaction 5min are added into waste water
Afterwards, then static 15 minutes, supernatant sulfate radical and heavy metal concentration and precipitating sludge volume are determined.
As a result show, the sulfate radical in waste water is down to 20mg/L, during heavy metal qualified discharge, now barium hydroxide is added
Measure as 0.05g/L, barium chloride dosage is 3.05g/L, and organic sulfur dosage is 50mg/L, according to the barium chloride market price
2600 yuan/ton, the barium hydroxide market price is 4500 yuan/ton, and the organic sulfur market price is 120000 yuan/ton, then ton water process
About 14 yuan of reagent cost.After measured, after precipitation 15min, one-level precipitating sludge volume is 50mL, and two-stage precipitation sludge volume is about
20mL。
Experiment three：Using present invention process, waste water is after preliminary filtering removes most suspended substances, to 1000mL waste water
Middle addition barium hydroxide solution (mass concentration 2%), 9.5 are adjusted to by wastewater pH, then add barium chloride (mass concentration 10%)
After solution, reaction 10min, added into waste water after organic sulfur, reaction 10min, add flocculant into waste water and flocculation aid is anti-
Answer after 5min, then after precipitation clarification 15min, determine supernatant sulfate radical and heavy metal concentration and precipitating sludge volume.
Found through overtesting, the sulfate radical in waste water is down to 20mg/L, during heavy metal qualified discharge, now barium hydroxide
Dosage is 0.05g/L, and barium chloride dosage is 3.15g/L, and organic sulfur dosage is 50mg/L, according to barium chloride market
2600 yuan/ton of price, the barium hydroxide market price is 4500 yuan/ton, and the organic sulfur market price is 120000 yuan/ton, then ton water
About 14.2 yuan for the treatment of agent cost.After measured, sludge cumulative volume about 65mL after being precipitated in 15min sedimentation basins.It is useless after raw processing
Water can meet film concentration inflow requirement.
As can be seen from the above-described embodiment, using the PROCESS FOR TREATMENT desulfurization wastewater of the present invention, medicament expense is only 14 yuan/
Ton, 24.1 yuan/ton than traditional handicraft are greatly reduced, and the sludge quantity produced is also greatly reduced, and advantageously reduces follow-up sludge
Handle load and processing cost.
Obviously, described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on this hair
Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to the scope of protection of the invention.
Claims (11)
1. a kind of device of desulfurization wastewater pretreatment, it is characterised in that including flowing to what is set along desulfurization wastewater：
First-stage reactor, adds unit and an organic sulfur provided with a barium hydroxide or sulfide adds unit；
Second reactor, unit is added provided with barium salt.
2. the device of desulfurization wastewater pretreatment as claimed in claim 1, it is characterised in that also including being arranged at first-stage reactor
Preliminary sedimentation tank between second reactor；It is arranged at the second pond in second reactor downstream.
3. the device of desulfurization wastewater pretreatment as claimed in claim 2, it is characterised in that the first-stage reactor and preliminary sedimentation tank
Between, between second reactor and second pond be equipped with flocculation reaction unit.
4. the device of desulfurization wastewater pretreatment as claimed in claim 2, it is characterised in that the bottom of the preliminary sedimentation tank and second pond
Portion is respectively provided with mud discharging mouthful.
5. the device of desulfurization wastewater pretreatment as claimed in claim 1, it is characterised in that also including being arranged at first-stage reactor
The pretreatment system of upstream.
6. the device of desulfurization wastewater pretreatment as claimed in claim 5, it is characterised in that the pretreatment system includes COD
Processing unit and/or suspension processing unit.
7. the device of desulfurization wastewater as claimed in claim 1 pretreatment, it is characterised in that the first-stage reactor and two grades it is anti-
Device is answered to be equipped with agitating unit.
8. the device of desulfurization wastewater pretreatment as claimed in claim 1, it is characterised in that the first-stage reactor includes first
Reaction member and the second reaction member, barium hydroxide add unit located at the first reaction member, and organic sulfur or sulfide add list
Member is located at the second reaction member.
9. a kind of method of desulfurization wastewater pretreatment, comprises the following steps：
Barium hydroxide is added into desulfurization wastewater, pH value of waste water is adjusted to 8.5-10；Then organic sulfur or sulfide are added, is carried out
Except reacting and removing part of sulfuric acid root again, obtain except weight waste water；
Barium salt is added in except weight waste water, is removed except remaining sulfate ion in weight waste water.
10. a kind of device of desulfurization wastewater pretreatment, it is characterised in that including flowing to what is set along desulfurization wastewater：
First-stage reactor, adds unit provided with a barium hydroxide and a barium salt adds unit；
Second reactor, unit is added provided with an organic sulfur or sulfide.
11. a kind of method of desulfurization wastewater pretreatment, comprises the following steps：
Barium hydroxide is added into desulfurization wastewater, pH value of waste water is adjusted to 8.5-10；Then barium salt is added, remove and reacts again simultaneously
Part of sulfuric acid root is removed, is obtained except weight waste water；
Organic sulfur or sulfide are added in except weight waste water, is removed except remaining sulfate ion in weight waste water.
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