CN107265696A - A kind of desulfurization wastewater sofening treatment device and method - Google Patents
A kind of desulfurization wastewater sofening treatment device and method Download PDFInfo
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- CN107265696A CN107265696A CN201710565564.3A CN201710565564A CN107265696A CN 107265696 A CN107265696 A CN 107265696A CN 201710565564 A CN201710565564 A CN 201710565564A CN 107265696 A CN107265696 A CN 107265696A
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- Prior art keywords
- medicament
- desulfurization wastewater
- deliming
- sofening treatment
- nanofiltration
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- 239000002351 wastewater Substances 0.000 title claims abstract description 101
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 67
- 230000023556 desulfurization Effects 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims description 30
- 239000003814 drug Substances 0.000 claims abstract description 115
- 238000001728 nano-filtration Methods 0.000 claims abstract description 58
- 239000012141 concentrate Substances 0.000 claims abstract description 19
- 238000007781 pre-processing Methods 0.000 claims abstract description 13
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical group [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 42
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 32
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 24
- 235000011152 sodium sulphate Nutrition 0.000 claims description 24
- 238000005189 flocculation Methods 0.000 claims description 18
- 230000016615 flocculation Effects 0.000 claims description 18
- 229920002401 polyacrylamide Polymers 0.000 claims description 17
- 235000017550 sodium carbonate Nutrition 0.000 claims description 16
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 16
- 238000001556 precipitation Methods 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 9
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 5
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 5
- 239000004571 lime Substances 0.000 claims description 5
- 210000000481 breast Anatomy 0.000 claims description 4
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 3
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 3
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 61
- 241000370738 Chlorion Species 0.000 abstract description 11
- 238000002360 preparation method Methods 0.000 abstract description 10
- 238000003672 processing method Methods 0.000 abstract 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 18
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 12
- 229910001424 calcium ion Inorganic materials 0.000 description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 11
- 235000010216 calcium carbonate Nutrition 0.000 description 9
- 239000006228 supernatant Substances 0.000 description 9
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 8
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 7
- 229910000019 calcium carbonate Inorganic materials 0.000 description 7
- 239000000920 calcium hydroxide Substances 0.000 description 7
- 235000011116 calcium hydroxide Nutrition 0.000 description 7
- 229910001425 magnesium ion Inorganic materials 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000011780 sodium chloride Substances 0.000 description 6
- 239000012528 membrane Substances 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 4
- 239000005864 Sulphur Substances 0.000 description 4
- WBZKQQHYRPRKNJ-UHFFFAOYSA-L disulfite Chemical compound [O-]S(=O)S([O-])(=O)=O WBZKQQHYRPRKNJ-UHFFFAOYSA-L 0.000 description 4
- 229910052749 magnesium Inorganic materials 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000035611 feeding Effects 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- PANBYUAFMMOFOV-UHFFFAOYSA-N sodium;sulfuric acid Chemical compound [Na].OS(O)(=O)=O PANBYUAFMMOFOV-UHFFFAOYSA-N 0.000 description 2
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 238000005111 flow chemistry technique Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension 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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- 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
- C02F2101/12—Halogens or halogen-containing 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
- C02F2101/206—Manganese or manganese 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- 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
- 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
- C02F5/06—Softening water by precipitation of the hardness using calcium compounds
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The present invention provides a kind of desulfurization wastewater sofening treatment device, including：The softening pre-processing assembly being sequentially arranged and a nanofiltration system；The nanofiltration system has a concentrate recirculation mouthful；The softening pre-processing assembly has a medicament adding device, and the concentrate recirculation mouthful is connected with the medicament adding device.Sulfate radical is separated with chlorion by nanofiltration, and the nanofiltration concentrated water for concentrating sulfate radical is used for preparation softening medicament water, operating cost can be greatly reduced.The processing method realized based on said apparatus is provided simultaneously.
Description
Technical field
The present invention relates to a kind of desulfurization wastewater sofening treatment device and method, belong to desulfurization wastewater process field.
Background technology
Wet desulphurization is the existing main flume desulfurization technology of domestic thermal power plant, and thermal power plant is every year in based Wet Process Flue Gas
In can produce a large amount of desulfurization wastewaters.By taking a 300MW coal-burning power plant as an example, its per day generation desulfurization wastewater amount is about 300 tons.
Desulfurization wastewater contain the calcium of plurality of heavy metal ion (such as mercury, lead, cadmium, manganese, arsenic), high suspended matter, and very high concentrations, magnesium,
Sulfate radical and chlorion etc., are one of most intractable waste water of power plant.
Country's desulfurization wastewater main flow processing method is three company's case factures at present, and this method is mainly by adding medicament to de-
Sulphur waste water is neutralized, flocculated respectively, settlement treatment, can remove most of heavy metal and suspension in waste water.But in waste water
Calcium, magnesium, sulfate radical and the chlorion of high concentration are not removed effectively.This causes useless after three connect the processing of case method
Water is very strong to equipment corrosion, is typically only capable to use as cinder of electric power plant landfill yard shower water, and coal yard dedusting sprinkling.But by
It is very high in the solubility of calcium and magnesium chloride, easily rinsed with rainfall and spread and cause saline Land.Deteriorate increasingly with ecological environment,
National environmental protection policy is increasingly strict, to desulfurization wastewater carry out advanced treating, go water removal in calcium, magnesium, sulfate radical and chlorion, into
The major issue for needing to solve for Thermal Power Generation Industry.
Traditional softening method removes calcium ions and magnesium ions in water removal by the way of feeding lime breast and soda ash.However, desulfurization wastewater
Middle calcium ions and magnesium ions are dense (about 3000 to 20000mg/L), and large quantities of lime breast and soda ash can be consumed using conventional method.Especially
Soda ash consumption is very big, calculates (about 500 yuan/ton of milk of lime, about 1500 yuan/ton of soda ash) with existing market average price, desulfurization
Waste water softening adding of agent cost will be up to tens yuan/ton.Meanwhile, if in desulfurization wastewater a large amount of sulfate radicals and chlorion without
Separating treatment, can form mixed salt after condensing crystallizing.This mixed salt is difficult with no market value, and cost of disposal is very
It is high.
The content of the invention
For the deficiency of existing desulfurization wastewater sofening treatment method, the invention provides a kind of desulfurization wastewater sofening treatment dress
Put and method, separated sulfate radical with chlorion by nanofiltration, and the nanofiltration concentrated water for concentrating sulfate radical is used to prepare softening
Medicament water, can be greatly reduced operating cost.
The present invention concrete technical scheme be：
A kind of desulfurization wastewater sofening treatment device, including：
The softening pre-processing assembly being sequentially arranged and a nanofiltration system；
The nanofiltration system has a concentrate recirculation mouthful；
The softening pre-processing assembly has a medicament adding device, the concentrate recirculation mouthful and the medicament adding device phase
Even.
Further, the softening pre-processing assembly includes one first deliming list being connected with the medicament adding device
Member.
Further, the softening pre-processing assembly also includes the demagging unit with demagging medicament adding device, tool
There is one second deliming unit of deliming medicament adding device.
Further, the medicament adding device includes at least a medicament configuration unit and dosing unit, dosing unit and
Concentrate recirculation mouthful is communicated to medicament configuration unit.
Further, the downstream of the demagging unit and the second deliming unit connects a precipitation unit.
A kind of desulfurization wastewater sofening treatment method, comprises the following steps：
Nanofiltration processing is carried out after the softened pretreatment of desulfurization wastewater；
The concentrate recirculation that the nanofiltration processing is produced is used as addition medicament (the softening medicament configuration in softening preprocessing process
Solvent).
Further, the softening pretreatment includes being used as addition medicine after mixing with a configuration medicament using the concentrate recirculation
Agent carries out a deliming to desulfurization wastewater.
Further, the softening pretreatment also includes addition demagging medicament to desulfurization wastewater progress demagging, adds deliming
Medicament carries out secondary deliming to desulfurization wastewater.
Further, the demagging medicament includes basic agent, flocculant and flocculation aid；The configuration medicament D is sulfuric acid
Sodium；The deliming medicament includes flocculant, flocculation aid and soda ash.
Further, the basic agent selects milk of lime；The flocculant, selected from aluminium polychloride, poly-ferric chloride,
Bodied ferric sulfate, PAFC or PAFS；The flocculation aid, selected from cationic-type polyacrylamide, it is non-from
Subtype polyacrylamide or anion-polyacrylamide.
Desulfurization wastewater as described above first passes through chemical tendering pretreatment, goes in water removal after most calcium ions and magnesium ions, then adopt
With nanofiltration separation sulfate radical in waste water and chlorion.Sodium chloride purity may be used as work processed up to more than 98% in nanofiltration production water
The raw material of industry salt or electrolysis caustic soda processed and hydrochloric acid.And due to containing high concentration sodium sulfate in nanofiltration concentrated water, it regard reuse as preparation
Soften medicament water, consequently, it is possible to which great lot of water resources can be saved, while eliminating nanofiltration concentrated water disposal link, be conducive to letter
Change flow and reduction waste water sofening treatment operating cost.
Brief description of the drawings
Fig. 1 is the arrangement schematic diagram of the desulfurization wastewater sofening treatment device of first, second and third embodiment of the invention.
Fig. 2 is the structure and principle of the desulfurization wastewater sofening treatment device Chinese medicine dispensing unit of fifth embodiment of the invention
Schematic diagram.
Description of reference numerals：
1- demaggings pond, 2- agitating device A, 3- first stage precipitation tank, 4- mud line A, 5- one-level delimings pond, 6- agitating devices
B, 7- medicament D add pipeline, bis- grades of deliming ponds of 8-, 9- agitating device C, 10- second-level settling pond, 11- mud lines B, 12- and received
Filter system, 13- nanofiltration water producing pipes road, 14- nanofiltration concentrate recirculations pipeline, 15- medicaments D prepare pond A, 16- medicament D prepare pond B,
17- agitating device D, 18- medicaments D prepares pond A water intaking valves, 19- medicaments D and prepares pond A outlet valves, 20- agitating device E, 21- medicines
Agent D prepares pond B water intaking valves, 22- medicaments D and prepares pond B outlet valves, 23- sodium sulphate proof dry powder feedings device, 24- medicaments preparation case, 25-
Agitator.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.
First embodiment：
The system of the present embodiment desulfurization wastewater sofening treatment, as shown in figure 1, including：As the demagging pond 1 of demagging unit,
Agitating device A2, first stage precipitation tank 3, mud line A4, it is used as the one-level deliming pond 5 of the first deliming unit, agitating device B6, medicine
Agent D adds pipeline 7, as two grades of deliming ponds 8 of the second deliming unit, agitating device C9, second-level settling pond 10, mud line
B11, foregoing each portion's composition softening pre-processing assembly；Nanofiltration system 12, nanofiltration water producing pipe road 13, nanofiltration concentrate recirculation pipeline 14,
Medicament D prepares pond A15, medicament D preparation pond B16, agitating device D17, medicament D preparations pond A water intaking valves 18, medicament D and prepares pond A and go out
Water valve 19, agitating device E20, medicament D prepare pond B water intaking valves 21, medicament D and prepare pond B outlet valves 22.
Wherein, the demagging pond 1 and first stage precipitation tank 3 share the mud line A4, the one-level deliming pond 5, two grades
Deliming pond 8 and second-level settling pond 10 share the mud line B11.
The demagging pond 1, first stage precipitation tank 3, one-level deliming pond 5, two grades of deliming ponds 8 and the bottom of second-level settling pond 10 are all provided with
Have and agitating device or other uniform dresses are equipped with spoil disposal funnel, the demagging pond 1, one-level deliming pond 5 and two grades of deliming ponds 8 pond
Put to ensure that water distribution is uniform in reactor.
In the demagging pond 1 pipeline is added provided with medicament A, B, C；Added in the one-level deliming pond 5 provided with the medicament D
Pipeline 7；In two grades of deliming ponds 8 pipeline is added provided with medicament B, C, E；The medicament D prepares pond A15 and medicament D and prepares pond
B16 adds pipeline provided with medicament D.
The medicament A is basic agent, preferably certain density milk of lime；The medicament B is flocculant, the flocculation
Agent is aluminium polychloride, poly-ferric chloride, bodied ferric sulfate, PAFC or PAFS；The medicament C is to help
Solidifying agent, can be cationic-type polyacrylamide, non-ionic polyacrylamide or anion-polyacrylamide.Described poly- third
Acrylamide molecular weight is preferably 5 × 105 to 1.5 × 107 dalton；The medicament D be sodium sulphate, mass concentration be 1% to
20%；The medicament E is soda ash.
The main function of nanofiltration system 12 is separation sulfate and chloride, according to actual needs, can use one-level,
Can be using multistage nanofiltration；
The nanofiltration membrane component of nanofiltration system 12 is rolled film, tubular membrane, Flat Membrane, hollow-fibre membrane or dish tubular membrane；
Further, the diaphragm operating pressure of nanofiltration system 12 is 0.3 to 6MPa.
The discharge nanofiltration of nanofiltration concentrated water pipeline 13 concentrated water is used for the medicament preparation water of the medicament D sodium sulphate medicaments.
The medicament D prepares pond A15 and medicament D and prepared in the B16 of pond provided with liquid level gauge.
The agitating device A2, agitating device B6, agitating device C9, agitating device D17, medicament D prepare pond A water intaking valves
18th, medicament D prepares pond A outlet valves 19, agitating device E20, medicament D and prepares pond B water intaking valves 21, medicament D preparation pond B outlet valves
22 start and stop are controlled by corresponding on-line automatic control device.
Specifically can be by following steps using above-mentioned desulfurization wastewater sofening treatment system processing desulfurization wastewater：
Step 1, desulfurization wastewater introduces the demagging pond 1, opens the agitating device A.First add the medicament A lime
Breast, pH is adjusted to 10 to 13, to remove magnesium ion in the desulfurization wastewater.It is subsequently added the flocculant medicament B and described
Flocculation aid medicament C, is flocculated.
Step 2, desulfurization wastewater overflow, to the first stage precipitation tank 3, is precipitated in the step 1 and produced in the demagging pond 1
Sludge.
Step 3, supernatant overflow, to the one-level deliming pond 5, opens agitating device B in the first stage precipitation tank 3.Add
The medicament D sodium sulphate, makes most of calcium ion formation crystal of calcium sulfate in the desulfurization wastewater so that the desulfurization wastewater is hard
Degree is down to 1000 to 5000mg/L (with calcium carbonates).
Step 4, desulfurization wastewater overflow, to two grades of deliming ponds 8, opens the agitating device in the one-level deliming pond 5
C.The medicament E sodium carbonate medicaments are added, to remove remaining calcium ion in the desulfurization wastewater so that the desulfurization wastewater hardness
It is down to 5 to 300mg/L (with calcium carbonates).Flocculating agent B and flocculation aid C are subsequently added, flocculation treatment is carried out.
Step 5, in two grades of deliming ponds 8 desulfurization wastewater overflow to the second-level settling pond 10, precipitate the step 3 with
The sludge produced in 4.
Step 6, in the second-level settling pond 10 after desulfurization wastewater filtering, circulate and concentrate into the nanofiltration system 12, point
From sulfate radical and chlorion in desulfurization wastewater after the softening so that sodium chloride purity reaches more than 98% in nanofiltration production water.Reach
Nanofiltration production water discharge system is marked, in case subsequent treatment.Nanofiltration concentrate recirculation prepares pond A15 and medicament D to the medicament D and prepares pond
B16, is configured as needed to certain density metabisulfite solution and is used as softening medicament.
Step 7, the medicament D prepares pond A15 and medicament D and prepares pond B16 after the operation of system steady and continuous, by automatic
Control system alternately receives the nanofiltration concentrated water and sodium sulphate medicament is alternately added into the one-level deliming pond, to ensure system
Continuous operation.
Step 1 hydraulic detention time is 5 to 60 minutes；Step 2 hydraulic detention time is 5 to 30 minutes；Institute
Step 3 hydraulic detention time is stated for 5 to 30 minutes；Step 4 hydraulic detention time is 5 to 45 minutes；Step 5 water
The power residence time is 5 to 30 minutes.
Sodium sulfate concentration is 0.5% to 10% in nanofiltration concentrated water in the step 7.
Sludge in the step 5 is dehydrated by the mud line B into gypsum dehydration machine, can be used as gypsum by-product
Using or be back to desulfurization slurry pond.
The opening and closing of related valve and opening for agitating device are controlled by the on-line automatic control system in the step 7
Stop.
Nanofiltration production water can carry out concentration as needed and evaporative crystallization processing prepares crystal salt, or be entered using other modes
The processing of one step is utilized.
The experiment of desulfurization wastewater sofening treatment is carried out using said apparatus and method as follows：Certain heat-engine plant desulfurized wastewater effluent water
Matter is as follows：
The desulfurization wastewater is introduced into demagging pond, milk of lime medicament is first added, wastewater pH is adjusted to 12, it is described de- to remove
Magnesium ion in sulphur waste water.It is subsequently added 25mg/L bodied ferric sulfates to be flocculated with 10mg/L polyacrylamides, flocculation water sample will
Overflow to first stage precipitation tank is precipitated.The overflow of first stage precipitation tank supernatant adds sodium sulphate medicament (mass concentration to one-level deliming pond
10%) most of calcium ion in waste water, is removed.Add after sodium sulphate deliming, waste water hardness is down to 22100mg/L (with calcium carbonate
Meter).Subsequent waste water outflow adds sodium carbonate medicament to two grades of deliming ponds, to remove remaining calcium ion in waste water.Add sodium carbonate
Afterwards, waste water hardness is down to 82mg/L (with calcium carbonate).It is subsequently added 25mg/L bodied ferric sulfates and 10mg/L polyacrylamides
Flocculated, flocculation water sample precipitates overflow to second-level settling pond.After second-level settling pond supernatant is handled through cartridge filter, enter
Enter nanofiltration system, separate after the softening sulfate radical and chlorion in desulfurization wastewater.After nanofiltration separation and concentration, nanofiltration production water
Middle sodium chloride purity reaches that sodium sulfate concentration reaches 47075mg/L in 98.7%, nanofiltration concentrated water, and cycles of concentration is up to 3.2 times.Nanofiltration is dense
Water all flows back to sodium sulphate medicament configuration pond, as metabisulfite solution preparation water.Sodium sulphate medicament configuration pond A will replace with B
Receive nanofiltration concentrated water and be alternately administered into one-level deliming pond.It is logical to utilize nanofiltration system concentrate recirculation, reduce softening medicament and disappear
Consumption, through adjusting, in this embodiment, sofening treatment medicament expense is about 7 yuan/ton.
Second embodiment：
Certain heat-engine plant desulfurized waste water is handled using traditional softening process, raw wastewater water quality is as follows：
Milk of lime medicament is added into the desulfurization wastewater, wastewater pH is adjusted to 12, to remove magnesium in the desulfurization wastewater
Ion.It is subsequently added 25mg/L bodied ferric sulfates to be flocculated with 10mg/L polyacrylamides, flocculation water sample is by overflow to one-level
Sedimentation basin is precipitated.The overflow of first stage precipitation tank supernatant is to deliming pond, and into deliming pond, waste water adds sodium carbonate medicament, useless to remove
Calcium ion in water, makes waste water hardness be down to 82mg/L (with calcium carbonate).It is subsequently added 25mg/L bodied ferric sulfates and 10mg/L
Polyacrylamide is flocculated, and flocculation water sample precipitates overflow to second-level settling pond.Second-level settling pond supernatant is filtered through security personnel
After device processing, further processing.Through adjusting, now sofening treatment medicament expense is about 16 yuan/ton.
3rd embodiment：
The system of the present embodiment desulfurization wastewater sofening treatment, same to first embodiment.
The experiment of desulfurization wastewater sofening treatment is carried out using said apparatus as follows：Certain heat-engine plant desulfurized wastewater effluent water quality is such as
Under：
The desulfurization wastewater is introduced into demagging pond, milk of lime medicament is first added, wastewater pH is adjusted to 13, it is described de- to remove
Magnesium ion in sulphur waste water.It is subsequently added 500mg/L bodied ferric sulfates to be flocculated with 50mg/L polyacrylamides, flocculation water sample will
Overflow to first stage precipitation tank is precipitated.The overflow of first stage precipitation tank supernatant adds sodium sulphate medicament (mass concentration to one-level deliming pond
30%) most of calcium ion in waste water, is removed.Add after sodium sulphate deliming, waste water hardness is down to 29100mg/L (with calcium carbonate
Meter).Subsequent waste water outflow adds sodium carbonate medicament to two grades of deliming ponds, to remove remaining calcium ion in waste water.Add sodium carbonate
Afterwards, waste water hardness is down to 7mg/L (with calcium carbonate).It is subsequently added 100mg/L bodied ferric sulfates and 20mg/L polyacrylamides
Flocculated, flocculation water sample precipitates overflow to second-level settling pond.After second-level settling pond supernatant is handled through cartridge filter, enter
Enter nanofiltration system circulation concentration, separate after the softening sulfate radical and chlorion in desulfurization wastewater.After nanofiltration separation and concentration,
Sodium chloride purity reaches that sodium sulfate concentration reaches 51075mg/L in 98.2%, nanofiltration concentrated water in nanofiltration production water, and cycles of concentration is up to 4 times.
Nanofiltration concentrated water all flows back to sodium sulphate medicament configuration pond, as metabisulfite solution preparation water.Sodium sulphate medicament configuration pond A and B
Nanofiltration concentrated water will alternately be received and be alternately administered into one-level deliming pond.Through adjusting, now sofening treatment medicament expense is about
15.4 yuan/ton.
Fourth embodiment：
The system of the present embodiment desulfurization wastewater sofening treatment, same to first embodiment.
The experiment of desulfurization wastewater sofening treatment is carried out using said apparatus as follows：Certain heat-engine plant desulfurized wastewater effluent water quality is such as
Under：
The desulfurization wastewater is introduced into demagging pond, milk of lime medicament is first added, wastewater pH is adjusted to 11, it is described de- to remove
Magnesium ion in sulphur waste water.It is subsequently added 50mg/L bodied ferric sulfates to be flocculated with 15mg/L polyacrylamides, flocculation water sample will
Overflow to first stage precipitation tank is precipitated.The overflow of first stage precipitation tank supernatant adds sodium sulphate medicament (mass concentration to one-level deliming pond
1%) most of calcium ion in waste water, is removed.Add after sodium sulphate deliming, waste water hardness is down to 34200mg/L (with calcium carbonate
Meter).Subsequent waste water outflow adds sodium carbonate medicament to two grades of deliming ponds, to remove remaining calcium ion in waste water.Add sodium carbonate
Afterwards, waste water hardness is down to 298mg/L (with calcium carbonate).It is subsequently added 50mg/L bodied ferric sulfates and 15mg/L polyacrylamides
Flocculated, flocculation water sample precipitates overflow to second-level settling pond.After second-level settling pond supernatant is handled through cartridge filter, enter
Enter nanofiltration system circulation concentration, separate after the softening sulfate radical and chlorion in desulfurization wastewater.After nanofiltration separation and concentration,
Sodium chloride purity reaches that sodium sulfate concentration reaches 55730mg/L in 98.9%, nanofiltration concentrated water in nanofiltration production water, and cycles of concentration is up to 4 times.
Nanofiltration concentrated water all flows back to sodium sulphate medicament configuration pond, as metabisulfite solution preparation water.Sodium sulphate medicament configuration pond A and B
Nanofiltration concentrated water will alternately be received and be alternately administered into one-level deliming pond.Through adjusting, now sofening treatment medicament expense is about
13.8 yuan/ton.
When conventional lime+soda ash softening technology is used it can be seen from the first and second embodiments reagent cost for 16 yuan/
Ton, and the softening process in the present invention is used, the medicament expense that sofening treatment can be greatly reduced is used, only 7 yuan/ton.That is this hair
Bright technique has obvious economic advantages.It is of the invention it can be seen from other embodiment when handling high-concentration desulfurized waste water
Technical scheme equally has larger cost advantage.
5th embodiment：
The processing of nanofiltration concentrate recirculation is adjusted, as shown in Fig. 2 nanofiltration concentrate recirculation to medicament prepares case 24, sulfuric acid
Sodium proof dry powder feeding device 23 is to medicament configuration to congenial sodium sulphate dry powder, after being thoroughly mixed by agitator 25, as once
The addition medicament of deliming.Solution is acted on behalf of using dry powder, facilitates medicament to add, same technique effect is resulted in.
It should be noted that in this manual, such as first and second or the like relational terms are used merely to one
Individual entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operate it
Between there is any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Cover including for nonexcludability, so that process, method, article or terminal device including a series of key elements not only include
Those key elements, but also other key elements including being not expressly set out, or also include for this process, method, article or
The intrinsic key element of person's terminal device.In the absence of more restrictions, being limited by sentence " including ... " or " including ... "
Fixed key element, it is not excluded that also there is other want in the process including the key element, method, article or terminal device
Element.In addition, herein, " being more than ", " being less than ", " exceeding " etc. are interpreted as not including this number；" more than ", " following ", " within "
Etc. being interpreted as including this number.
Although the various embodiments described above are described, those skilled in the art once know basic wound
The property made concept, then can make other change and modification to these embodiments, so embodiments of the invention are the foregoing is only,
Not thereby the scope of patent protection of the present invention, the equivalent structure that every utilization description of the invention and accompanying drawing content are made are limited
Or equivalent flow conversion, or other related technical fields are directly or indirectly used in, similarly it is included in the patent of the present invention
Within protection domain.
Claims (10)
1. a kind of desulfurization wastewater sofening treatment device, it is characterised in that including：
The softening pre-processing assembly being sequentially arranged and a nanofiltration system；
The nanofiltration system has a concentrate recirculation mouthful；
The softening pre-processing assembly has a medicament adding device, and the concentrate recirculation mouthful is connected with the medicament adding device.
2. desulfurization wastewater sofening treatment device as claimed in claim 1, it is characterised in that the softening pre-processing assembly includes
One first deliming unit being connected with the medicament adding device.
3. desulfurization wastewater sofening treatment device as claimed in claim 2, it is characterised in that the softening pre-processing assembly is also wrapped
The demagging unit with demagging medicament adding device is included, the one second deliming unit with deliming medicament adding device.
4. desulfurization wastewater sofening treatment device as claimed in claim 3, it is characterised in that the demagging unit and the second deliming
The downstream of unit connects a precipitation unit.
5. desulfurization wastewater sofening treatment device as claimed in claim 1, it is characterised in that the medicament adding device is included extremely
Few a medicament configuration unit and dosing unit, dosing unit and concentrate recirculation mouthful are communicated to medicament configuration unit.
6. a kind of desulfurization wastewater sofening treatment method, comprises the following steps：
Nanofiltration processing is carried out after the softened pretreatment of desulfurization wastewater；
The concentrate recirculation that the nanofiltration processing is produced is as the addition medicament in softening preprocessing process.
7. desulfurization wastewater sofening treatment method as claimed in claim 6, it is characterised in that the softening pretreatment is included with institute
State after concentrate recirculation is mixed with a configuration medicament as addition medicament to a desulfurization wastewater deliming of progress.
8. desulfurization wastewater sofening treatment method as claimed in claim 7, it is characterised in that the softening pretreatment also includes adding
Plus demagging medicament carries out demagging to desulfurization wastewater, addition deliming medicament carries out secondary deliming to desulfurization wastewater.
9. desulfurization wastewater sofening treatment method as claimed in claim 8, it is characterised in that the demagging medicament includes alkaline medicine
Agent, flocculant and flocculation aid；The configuration medicament is sodium sulphate；The deliming medicament includes flocculant, flocculation aid and soda ash.
10. desulfurization wastewater sofening treatment method as claimed in claim 9, it is characterised in that the basic agent selects lime
Breast；The flocculant, selected from aluminium polychloride, poly-ferric chloride, bodied ferric sulfate, PAFC or polyaluminium sulfate
Iron；The flocculation aid, selected from cationic-type polyacrylamide, non-ionic polyacrylamide or anion-polyacrylamide.
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| CN110156181A (en) * | 2018-03-27 | 2019-08-23 | 新疆环境工程技术有限责任公司 | A kind of desulfurization wastewater secondary softening scale removal and sludge reuse treatment process |
| CN110590040A (en) * | 2019-09-30 | 2019-12-20 | 江苏源拓环境科技有限公司 | Wastewater treatment method and wastewater treatment system |
| CN111039488A (en) * | 2020-01-06 | 2020-04-21 | 大唐环境产业集团股份有限公司 | Desulfurization wastewater recycling treatment system and treatment method |
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