CN105753209A - Arsenic containing wastewater treatment method - Google Patents
Arsenic containing wastewater treatment method Download PDFInfo
- Publication number
- CN105753209A CN105753209A CN201610134099.3A CN201610134099A CN105753209A CN 105753209 A CN105753209 A CN 105753209A CN 201610134099 A CN201610134099 A CN 201610134099A CN 105753209 A CN105753209 A CN 105753209A
- Authority
- CN
- China
- Prior art keywords
- arsenic
- waste water
- containing waste
- processing method
- water according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910052785 arsenic Inorganic materials 0.000 title claims abstract description 155
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 title claims abstract description 148
- 238000004065 wastewater treatment Methods 0.000 title abstract description 15
- 239000002351 wastewater Substances 0.000 claims abstract description 99
- 238000003756 stirring Methods 0.000 claims abstract description 37
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 21
- 238000000926 separation method Methods 0.000 claims abstract description 19
- 239000007800 oxidant agent Substances 0.000 claims abstract description 16
- 239000008394 flocculating agent Substances 0.000 claims abstract description 13
- 239000007791 liquid phase Substances 0.000 claims abstract description 11
- 239000012071 phase Substances 0.000 claims abstract description 3
- 238000003672 processing method Methods 0.000 claims description 31
- 230000001590 oxidative effect Effects 0.000 claims description 16
- 239000002893 slag Substances 0.000 claims description 16
- 150000002505 iron Chemical class 0.000 claims description 15
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 229920002401 polyacrylamide Polymers 0.000 claims description 12
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 10
- 239000011790 ferrous sulphate Substances 0.000 claims description 10
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 10
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 10
- 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 9
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- VTIIJXUACCWYHX-UHFFFAOYSA-L disodium;carboxylatooxy carbonate Chemical compound [Na+].[Na+].[O-]C(=O)OOC([O-])=O VTIIJXUACCWYHX-UHFFFAOYSA-L 0.000 claims description 6
- 229940045872 sodium percarbonate Drugs 0.000 claims description 6
- 229920002125 Sokalan® Polymers 0.000 claims description 5
- 229910000358 iron sulfate Inorganic materials 0.000 claims description 5
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 5
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 4
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 4
- MCDLETWIOVSGJT-UHFFFAOYSA-N acetic acid;iron Chemical compound [Fe].CC(O)=O.CC(O)=O MCDLETWIOVSGJT-UHFFFAOYSA-N 0.000 claims description 4
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 4
- 239000000920 calcium hydroxide Substances 0.000 claims description 4
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 4
- 239000003153 chemical reaction reagent Substances 0.000 claims description 4
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 claims description 4
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 claims description 4
- 239000011574 phosphorus Substances 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 4
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- FBAFATDZDUQKNH-UHFFFAOYSA-M iron chloride Chemical compound [Cl-].[Fe] FBAFATDZDUQKNH-UHFFFAOYSA-M 0.000 claims description 3
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 3
- 239000004584 polyacrylic acid Substances 0.000 claims description 3
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 3
- 235000019394 potassium persulphate Nutrition 0.000 claims description 3
- ZKQDCIXGCQPQNV-UHFFFAOYSA-N Calcium hypochlorite Chemical compound [Ca+2].Cl[O-].Cl[O-] ZKQDCIXGCQPQNV-UHFFFAOYSA-N 0.000 claims description 2
- 239000004155 Chlorine dioxide Substances 0.000 claims description 2
- 229910021575 Iron(II) bromide Inorganic materials 0.000 claims description 2
- 229910002651 NO3 Inorganic materials 0.000 claims description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 claims description 2
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 2
- 239000007844 bleaching agent Substances 0.000 claims description 2
- 235000019398 chlorine dioxide Nutrition 0.000 claims description 2
- 229940046149 ferrous bromide Drugs 0.000 claims description 2
- 229960002089 ferrous chloride Drugs 0.000 claims description 2
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 claims description 2
- GYCHYNMREWYSKH-UHFFFAOYSA-L iron(ii) bromide Chemical compound [Fe+2].[Br-].[Br-] GYCHYNMREWYSKH-UHFFFAOYSA-L 0.000 claims description 2
- BQZGVMWPHXIKEQ-UHFFFAOYSA-L iron(ii) iodide Chemical compound [Fe+2].[I-].[I-] BQZGVMWPHXIKEQ-UHFFFAOYSA-L 0.000 claims description 2
- 238000005191 phase separation Methods 0.000 claims description 2
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 2
- 238000006365 thiocyanation reaction Methods 0.000 claims description 2
- FEONEKOZSGPOFN-UHFFFAOYSA-K tribromoiron Chemical compound Br[Fe](Br)Br FEONEKOZSGPOFN-UHFFFAOYSA-K 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 57
- 230000008569 process Effects 0.000 abstract description 39
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000010842 industrial wastewater Substances 0.000 abstract description 2
- 150000003839 salts Chemical class 0.000 abstract description 2
- 230000001988 toxicity Effects 0.000 abstract 1
- 231100000419 toxicity Toxicity 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 42
- 239000000243 solution Substances 0.000 description 23
- 238000001556 precipitation Methods 0.000 description 19
- 239000007864 aqueous solution Substances 0.000 description 12
- 239000002253 acid Substances 0.000 description 11
- 230000003647 oxidation Effects 0.000 description 10
- 238000007254 oxidation reaction Methods 0.000 description 10
- 239000000706 filtrate Substances 0.000 description 9
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 6
- 229910001385 heavy metal Inorganic materials 0.000 description 6
- 150000002500 ions Chemical class 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 5
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 5
- 235000011941 Tilia x europaea Nutrition 0.000 description 5
- 239000011575 calcium Substances 0.000 description 5
- 229910052791 calcium Inorganic materials 0.000 description 5
- 239000006071 cream Substances 0.000 description 5
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 5
- 238000002386 leaching Methods 0.000 description 5
- 239000004571 lime Substances 0.000 description 5
- 239000003513 alkali Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000003651 drinking water Substances 0.000 description 4
- 235000020188 drinking water Nutrition 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 208000027418 Wounds and injury Diseases 0.000 description 3
- 238000005273 aeration Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000005189 flocculation Methods 0.000 description 3
- 230000016615 flocculation Effects 0.000 description 3
- 230000036541 health Effects 0.000 description 3
- 208000014674 injury Diseases 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000006386 neutralization reaction Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 231100000004 severe toxicity Toxicity 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 150000001495 arsenic compounds Chemical class 0.000 description 2
- AQLMHYSWFMLWBS-UHFFFAOYSA-N arsenite(1-) Chemical compound O[As](O)[O-] AQLMHYSWFMLWBS-UHFFFAOYSA-N 0.000 description 2
- 238000000975 co-precipitation Methods 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 238000009300 dissolved air flotation Methods 0.000 description 2
- BMWMWYBEJWFCJI-UHFFFAOYSA-K iron(3+);trioxido(oxo)-$l^{5}-arsane Chemical compound [Fe+3].[O-][As]([O-])([O-])=O BMWMWYBEJWFCJI-UHFFFAOYSA-K 0.000 description 2
- 238000006396 nitration reaction Methods 0.000 description 2
- 239000003002 pH adjusting agent Substances 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 229910052979 sodium sulfide Inorganic materials 0.000 description 2
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- DJHGAFSJWGLOIV-UHFFFAOYSA-K Arsenate3- Chemical class [O-][As]([O-])([O-])=O DJHGAFSJWGLOIV-UHFFFAOYSA-K 0.000 description 1
- 208000008316 Arsenic Poisoning Diseases 0.000 description 1
- 229910017251 AsO4 Inorganic materials 0.000 description 1
- RMBBSOLAGVEUSI-UHFFFAOYSA-H Calcium arsenate Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-][As]([O-])([O-])=O.[O-][As]([O-])([O-])=O RMBBSOLAGVEUSI-UHFFFAOYSA-H 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 229910002588 FeOOH Inorganic materials 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 208000005374 Poisoning Diseases 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- FFBDACDVXVGRJS-UHFFFAOYSA-L [Fe+2].[As](=O)([O-])([O-])O Chemical compound [Fe+2].[As](=O)([O-])([O-])O FFBDACDVXVGRJS-UHFFFAOYSA-L 0.000 description 1
- WKKRFXQNNOMNSM-UHFFFAOYSA-M [Na+].[SH-].S.[AsH3] Chemical compound [Na+].[SH-].S.[AsH3] WKKRFXQNNOMNSM-UHFFFAOYSA-M 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- 125000001870 arsonato group Chemical group O=[As]([O-])([O-])[*] 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 229940043430 calcium compound Drugs 0.000 description 1
- 150000001674 calcium compounds Chemical class 0.000 description 1
- RTFOOERBKBOMSV-UHFFFAOYSA-L calcium;hydrogen arsorate Chemical compound [Ca+2].O[As]([O-])([O-])=O RTFOOERBKBOMSV-UHFFFAOYSA-L 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 239000002384 drinking water standard Substances 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000001676 hydride generation atomic fluorescence spectroscopy Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- MVFCKEFYUDZOCX-UHFFFAOYSA-N iron(2+);dinitrate Chemical compound [Fe+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MVFCKEFYUDZOCX-UHFFFAOYSA-N 0.000 description 1
- FLTRNWIFKITPIO-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe] FLTRNWIFKITPIO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000005374 membrane filtration Methods 0.000 description 1
- 229910052752 metalloid Inorganic materials 0.000 description 1
- 150000002738 metalloids Chemical class 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- HYHCSLBZRBJJCH-UHFFFAOYSA-M sodium hydrosulfide Chemical compound [Na+].[SH-] HYHCSLBZRBJJCH-UHFFFAOYSA-M 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- XPDICGYEJXYUDW-UHFFFAOYSA-N tetraarsenic tetrasulfide Chemical compound S1[As]2S[As]3[As]1S[As]2S3 XPDICGYEJXYUDW-UHFFFAOYSA-N 0.000 description 1
- 239000003403 water pollutant Substances 0.000 description 1
- 238000009941 weaving Methods 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
- C02F1/52—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
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- 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
- C02F2101/103—Arsenic 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)
- Removal Of Specific Substances (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention provides an arsenic containing wastewater treatment method.The arsenic containing wastewater treatment method includes steps: (1) adding a ferrous salt and an oxidizing agent into arsenic containing wastewater to obtain a solution A; (2) adding a ferric salt into the solution A, controlling a pH value of the arsenic containing wastewater to be 8-12 to obtain a solution B; (3) adding an organic flocculating agent and an inorganic flocculating agent, stirring, standing, and performing primary solid-liquid separation to separate a residue phase from a liquid phase.The arsenic containing wastewater treatment method has the advantages of low equipment requirement, simple technical process and low cost, the arsenic content of the treated wastewater completely reaches the national industrial wastewater discharge standards, residues of the treated wastewater are stable, and further hazards of arsenic toxicity are reduced.
Description
Technical field
The present invention relates to a kind of method of wastewater treatment, particularly relate to the processing method of arsenic-containing waste water.
Background technology
Arsenic compound has severe toxicity, it is easy at people's cylinder accumulation, cause arseniasis.Arsenic pollution poisoning (acute arsenic poisoning: Report) or the nuisance disease (arseniasis) caused are of common occurrence, and wherein, Drinking water endemic arsenism is a kind of common endemic diseases.China drinks high arsenic water area and relates to 10 provinces (district) Yue30Ge county (flag) such as Taiwan, Xinjiang, Inner Mongol, Tibet, Yunnan, Guizhou, Shanxi, Jilin, these areas have occurred Endemic Arsenism Patients, and be mostly less, limit, lean and lack low arsenic water source area.Arsenic is mainly with Inorganic arsenates (AsO4 3-) and arsenite (AsO3 3-) form, or be present in natural water with the form of methylated arsenic compound, respiratory tract, skin or food contact can be passed through and enter human body, be detrimental to health.
Arsenic pollutes and is mainly derived from the exploitation of arsenide, smelting and extensively utilizes, such as the production containing arsenic pesticide and use, and for example as the raw material of the industry such as glass, timber, process hides, weaving, chemical industry, pottery, pigment, chemical fertilizer.Pollute it addition, burning of coal result also in arsenic in various degree.Owing to arsenic is detrimental to health mainly through drinking water, a lot of country in the whole world is all one of arsenic water pollutant being classified as priority acccess control.Arsenic in Drinking Water content standard is decided to be lower than 10ppb by World Health Organization (WHO), and now also will drink Water jet cleaning by standard is decided to be below 10ppb in China.
Currently for the processing method of high-concentration arsenic-containing wastewater, mainly there are neutralization precipitation method, flocculation coprecipitation, ferrite process, sulphide precipitation etc..Wherein, neutralization precipitation method is as applying a kind of wider method in engineering, and mechanism is mainly added alkali (being usually calcium hydroxide) in waste water and improved its pH to 11～12, at this moment can generate calcium arsenite, Tricalcium arsenate precipitation.This method can remove major part arsenic in water, and method is simple, but body refuse precipitation is slowly, it is difficult to by purification of waste water to meeting discharge standard.Flocculation coprecipitation is the method that arsenic-containing waste water is with the most use that processes at present.It is made by adding (or original in waste water) Fe3+、Fe2+、Al3+And Mg2+Plasma, and it is transferred to suitable pH with alkali (being usually calcium hydroxide) so that it is form hydroxide colloid absorption and react with the arsenic in waste water, generating difficulty soluble salt precipitation and be removed.Ferrite process overcomes the defect of neutralization precipitation method, relies on the iron salt added to generate and has adsorbing Fe (OH)2、Fe(OH)3, FeOOH, react with arsenic and generate the less FeAsO of dissolubility4And FeAsO3Precipitation.But, above several method all needs to add substantial amounts of chemical agent, produces a large amount of waste residue, and these waste residues there is no good disposal way at present, there is secondary pollution problem.Sulphide precipitation is to utilize vulcanizing agent (Na2S, NaHS etc.) generate arsenic sulfide precipitation with arsenic in waste water ionic reaction, thus reaching the purpose of arsenic removal, but pH value is had very strict requirement by sulphide precipitation, pH value controls improper meeting and causes arsenic to be again introduced into water body, and generate hydrogen sulfide, hydrogen sulfide has severe toxicity, people can produce injury and can form secondary pollution.
Chinese patent (application number: 201310385447.0) discloses the processing method of a kind of Copper making High-arsenic wastewater, waste water after completing to precipitation pass into oxidizing, solid-liquid separation after addition lime cream and flocculant reaction, clear liquid pH value higher (9～12) after its process, and arsenic concentration is likely to still not up to industrial wastewater discharge standard (GB25466-2010), need to add discharge after clear water dilutes, hydrogen peroxide large usage quantity (H2O2The ratio of quality and Copper making High-arsenic wastewater volume is (0.1～10): 100g/ml), relatively costly.Chinese patent (application number: 201210090680.1) discloses the coupled processing method of a kind of acid High-arsenic wastewater, the step such as including precipitated sulfur acid group, oxidation precipitation, primary inclined plate sedimentation separates, oxidation is stirred, secondary inclined plate sedimentation separation, iron salt coagulation, dissolved air flotation, process regulates pH and oxidation processes twice, need a large amount of alkaline precipitating agent and oxidant, relatively costly.Chinese patent (application number: 96116742.4) provides a kind of method processing arsenic-containing waste water, pH value of waste water is regulated to 12 or higher with calcium compounds, need a large amount of Calx, this adds increased the calcium hardness of cost and water outlet, after-cost is higher, iron salt selects iron chloride so that in water outlet, chloride ion content is also higher.Chinese patent (application number: 201010165722.4) proposes a kind of method for treating low-concentration arsenic-containing wastewater, utilizes soda bath to regulate pH value and with cleaning membrane filtration, considerably increase cost in its operating process.Chinese patent (application number: 201110304407.X) discloses the processing method of a kind of high-concentration arsenic-containing wastewater, relate in pH and the step such as adjustment, oxidation precipitation (I), oxidation precipitation (II), iron salt coagulation, dissolved air flotation, wherein use substantial amounts of lime cream and oxidant, and repeatedly solid-liquid separation, add raw material and equipment investment.Chinese patent (application number: 201310025352.8) discloses the processing method of a kind of arsenic-containing waste water, the metalloid arsenic that sulfide carries out processing continuously to remove in waste water is added by multistage, precipitated by electrochemistry and aerating oxidation and waste water is carried out advanced treating, utilize sodium sulfide arsenic removal, it is likely to result in the effusion of hydrogen sulfide gas, operator are produced personal injury and secondary pollution can be formed, and sodium sulfide is expensive, subsequent electrochemical method and aeration and sedimentation add again cost.Chinese patent (application number: 201110308990.1) proposes a kind of arsenic-containing waste water and the deep treatment method of arsenic polluted underground water or drinking water, after process, in water, arsenic content can reach the drinking water standard that WHO specifies, but its just for low concentration arsenic-containing waste water (according to embodiment, the highest arsenic concentration is only 102ppm), for high-concentration arsenic-containing wastewater, arsenic removal effect is not ideal enough.Chinese patent (application number: 200910312545.5) proposes the processing method of a kind of high arsenic height alkali waste water, ferrous sulfate and oxidant is added under aeration condition, polyaddition iron sulfate flocculation in clear liquid after solid-liquid separation, and control the pH of solution, solid-liquid separation after standing, arranges outside clear liquid, and after process, arsenic concentration can reach country's surface water three class water quality standard, but its need aeration and artificially acid adding to control the pH of water outlet, this considerably increases cost.Chinese patent (application number: 201510212060.4) relates to the processing method of a kind of industry arsenic-containing waste water, employing two-section treatment processes, first it is neutralized to wastewater pH terminal more than 5 with alkali liquor, obtain one section and process water, process toward one section again and water adds Polyferric Sulfate and oxidant, control two-stage nitration and process water terminal more than 5, but it is confined to the process (4～30ppm) of low arsenic waste water, High-arsenic wastewater is not tested, and two-stage nitration goes out Water jet cleaning and still could possibly be higher than 0.3ppm (embodiment one, three, five), fail to reach discharge standard.
Growing and big containing day by day opening up of arsenic goods market along with industries such as metallurgy, chemical industry, the discharge of arsenic-containing waste water and pollution problem, will have influence on the raising of people's living standard, have influence on the improvement of environment for human survival.Find a kind of simple to operate, operating cost is low, environmental friendliness and be applicable to variable concentrations arsenic-containing waste water processing method extremely urgent.
Summary of the invention
Present invention is primarily targeted at and overcome problems of the prior art, it is provided that the processing method of a kind of arsenic-containing waste water, especially a kind of dosing is few, arsenic removal rate is high, technological process is simple and is applicable to the processing method of variable concentrations arsenic-containing waste water.
For achieving the above object, the invention provides the processing method of a kind of arsenic-containing waste water, comprise the steps:
(1) in arsenic-containing waste water, add ferrous salt and oxidant, obtain solution A；
(2) adding iron salt in solution A, the pH value controlled in arsenic-containing waste water is 8～12, obtains B solution；
(3) adding organic flocculant and inorganic flocculating agent in B solution, stirring carries out first time solid-liquid separation after standing, by slag phase and liquid phase separation.
According to the embodiment of the present invention, farther including: step (4) adds inorganic flocculating agent in step (3) gained liquid phase, stirring carries out second time solid-liquid separation after standing.
Wherein, step is initially charged ferrous salt in (1) in arsenic-containing waste water, then adds oxidant.Ferrous salt can add with simple substance or its aqueous solution form.
Step (1) adds ferrous salt or its aqueous solution, is advantageous on the one hand promoting the oxidation of arsenic to can substitute for part iron salt on the other hand, reduces reagent cost.Described ferrous salt is water miscible ferrous salt.Preferably, described ferrous salt at least one in ferrous chloride, ferrous sulfate, ferrous nitrate, iron iodide, ferrous bromide and Ferrous acetate.Described ferrous salt is (0.57～2.18) with the mol ratio of arsenic in aqueous phase (waste water): 1, it is preferable that (0.61～1.98): 1.
Adding oxidant in step (2) in arsenic-containing waste water and carry out pretreatment, react 10～60 minutes, make trivalent arsenic all be oxidized to pentavalent arsenic, strengthening precipitated ferric arsenate generates.Described oxidant at least one in SODIUM PERCARBONATE, sodium hypochlorite, hydrogen peroxide, potassium peroxydisulfate, Ammonium persulfate., bleaching powder and chlorine dioxide.The mol ratio of described oxidant and arsenic in waste water content is (0.87～4.56): 1, it is preferable that (1.20～3.70): 1.
Step (3) adds iron salt or molysite aqueous solution in arsenic-containing waste water, the pH value controlled in arsenic-containing waste water is 8～12, make the arsenic in liquid phase be converted into arsenic acid iron salt (with arsenic acid calcium salt, regulate pH value time employ calcium containing compound), formed precipitation.Iron salt can add with simple substance or its aqueous solution form.Described iron salt at least one in ferric chloride, iron sulfate, bodied ferric sulfate, ferric nitrate, nitrous acid ferrum, thiocyanation ferrum, ferric bromide and iron acetate.The mol ratio of described iron salt addition and arsenic in waste water is (0.08～0.39): 1, it is preferable that (0.10～0.30): 1.The reagent of described control pH value of solution at least one in calcium oxide, sodium carbonate, sodium hydroxide and calcium hydroxide.
Adding organic flocculant and inorganic flocculating agent in step (4) in arsenic-containing waste water, organic flocculant is high polymer coagulant, adds organic flocculant and is conducive to the sedimentation of precipitated ferric arsenate.
Described organic flocculant at least one in polyacrylamide (PAM), polyacrylic acid (PAA), sodium polyacrylate (PAAS) etc., wherein polyacrylamide (PAM) includes cationic-type polyacrylamide (CPAM), anion-polyacrylamide (APAM) and non-ionic polyacrylamide (NPAM), the number-average molecular weight of described polyacrylamide is 6,000,000～12,000,000, and addition is 5～50g/ ton waste water；Described polyacrylic acid mode of appearance is solid, and number-average molecular weight is 2,500,000～5,000,000, is made into aqueous solution during use, and addition is 1～10g/ ton waste water；The addition of described sodium polyacrylate is 1～10g/ ton waste water.
Described inorganic flocculating agent at least one in iron sulfate, aluminium polychlorid, bodied ferric sulfate, poly-ferric sulfate chloride and poly-phosphorus iron chloride.Inorganic flocculating agent can be directly added into, or be configured to solution (formulation agents) and add afterwards.The addition of inorganic flocculating agent is (0.15～0.76) with the mol ratio of arsenic in arsenic-containing waste water: 1, it is preferable that (0.20～0.62): 1.
Compared with processing technique with existing arsenic-containing waste water, utilizing the present invention to process arsenic-containing waste water has following several advantage:
1. the removal that sulphide precipitation is not suitable in sewage micro amount of arsenic, it is only applicable to the sewage of industrial high-content arsenic is carried out preliminary arsenic removal, can effectively remove arsenic in acid condition, and operating process is comparatively strict to the control of pH value, pH value is too high, the arsenic that can cause precipitation is anti-molten, has again hydrogen sulfide gas to overflow when pH value is too low, and sulfide itself is poisonous, expensive, in acid condition can not simultaneously fluorine removal, hydrogen sulfide gas has severe toxicity, and operator are produced personal injury.The scheme that the present invention proposes, the arsenic for Coal Gas Washing Cycling Water and low concentration is respectively provided with good removal effect, and raw material is cheap and easy to get, and arsenic slag thing is stable mutually, environmental friendliness；Adding oxidant, trivalent arsenic can be made more up hill and dale to be oxidized to pentavalent arsenic on the one hand, on the other hand, relative to aerating oxidation, energy consumption is substantially reduced, and has saved cost；
2. first time refer to the use of SODIUM PERCARBONATE in the treatment of waste water, and it has the advantage that I. SODIUM PERCARBONATE is considered as H2O2And Na2CO3Adduct, have H concurrently2O2And Na2CO3Double effects, play the pH value that improve water body while Oxidation, decrease the use of follow-up pH adjusting agent, reduce cost；And Na2CO3Existence can make again in water body exist Ca2+Precipitation, reduces the calcium hardness of water body, reduces the cost that follow-up water body calcium hardness processes.II. SODIUM PERCARBONATE has stronger washing dirt-removing functions, can play the effects such as bleaching, sterilization, be conducive to purifying water body；
3. the lime-iron salt method arsenic removal process that contrast is traditional, added amount of chemical of the present invention greatly reduces, and the final arsenic in water body quantity of slag is greatly decreased.Traditional handicraft (lime-iron salt method) often processes one cube of acid water (waste water for arsenic concentration > 1000ppm) two sections and neutralizes that always to go out the quantity of slag be 65～300Kg, the present invention often processes one cube of acid water (waste water for arsenic concentration > 1000ppm) two sections and neutralizes always to go out the quantity of slag and be only 25～130Kg, the arsenic quantity of slag is only the 1/3～1/2 of traditional handicraft, reduces follow-up dangerous solid waste processing cost；
4. add ferrous salt and not only can promote H2O2Play Oxidation better, and in acid condition, Fe2+With H2O2Reaction has Fe2(SO4)3Generation, it is possible to replace part iron salt, reduce reagent cost；
5. utilizing sodium hydroxide, sodium carbonate to do pH adjusting agent, relative to lime cream, mobility is higher, carries more convenient, and the requirement of pump power is lower, energy efficient；
6. the present invention can be under field conditions (factors), the arsenic-containing waste water of variable concentrations is focused on, the heavy metal ion of the overwhelming majority in waste water can be removed simultaneously, and technological process is simple, small investment, after process, liquid phase arsenic content reaches GB25466-2010 standard, thus being the process of enterprise's arsenic-containing waste water, it is provided that an approach economically and efficiently.
Accompanying drawing explanation
Fig. 1: the process chart of method for treating arsenic-containing wastewater of the present invention.
Detailed description of the invention
The present invention is described in detail by following specific embodiment, but the present invention is not restricted to following example.
Embodiment 1:
The present embodiment is about 350mg/L smeltery arsenic-containing waste water for arsenic concentration and processes.
Take 200ml smeltery arsenic-containing waste water, add 0.72gFeSO4·7H2nullO，Stirring adds the industrial hydrogen peroxide aqueous solution that 0.22g mass fraction is 27.5% after making it be completely dissolved，After stirring 50min under room temperature，Adding 0.12g mass fraction is the liquor ferri trichloridi of 50%，Quickly stir 1min，Adding the sodium hydroxide adjustment water sample pH that mass fraction is 20% therebetween is 8.67，Slowly the polymeric ferrous sulphate solution that 0.30g mass fraction is 40% and the PAM aqueous solution that 1.80g mass fraction is 0.18% are continuously added after stirring 5 minutes，At the uniform velocity after stirring 5min，Stop stirring，Solid-liquid separation after standing 30min，Filtrate adds the polymeric ferrous sulphate solution of 0.24g mass fraction 40%，Continue stirring 5min，Stop stirring，Solid-liquid separation after standing 30min，Take filtrate and measure remaining arsenic and all the other heavy metal ion contents.
Before and after wastewater treatment, water quality index data are as shown in table 1:
Water quality index before and after table 1. wastewater treatment
Embodiment 2:
The present embodiment is about 500mg/L mine acidic arsenic-containing waste water for arsenic concentration and processes.
Taking 600ml acid wastewater in mine, adding 8.76g mass fraction is the FeBr of 25%2Solution, it is the liquor natrii hypochloritis of 5.5% that stirring adds 6.85g available chlorine content after making it be completely dissolved, after stirring 30 minutes under room temperature, adding 0.63g mass fraction is the iron nitrate solution of 50%, quickly stirring regulated pH with sodium carbonate after 1 minute is 9.23, the poly-ferric sulfate chloride solution that 1.15g mass fraction is 40% and the CPAM aqueous solution that 1.35g mass fraction is 0.12% is continuously added after being slowly stirred 5 minutes, after quickly stirring 1 minute, low rate mixing 10 minutes, stop stirring, filter paper filtering after standing 30 minutes, solid-liquid separation, take filtrate and measure remaining arsenic and all the other heavy metal ion contents.
Before and after wastewater treatment, water quality index data are as shown in table 2:
Water quality index before and after table 2. wastewater treatment
Embodiment 3:
The present invention is directed to arsenic concentration to be about 1000mg/L smeltery arsenic-containing waste water and process.
Taking 500ml lead ore waste acid water, adding 6.60g mass fraction is the FeSO of 25%4·7H2nullO solution (is now joined)，The industrial hydrogen peroxide aqueous solution that 1.76g mass fraction is 27.5% is added after being uniformly mixed，After stirring 30 minutes under room temperature，Adding 0.75g mass fraction is the polymeric ferrous sulphate solution of 40%，Quickly stirring regulated pH with the lime cream that mass fraction is 30% after 1 minute is about 10.26，The PAA aqueous solution of poly-phosphorus ferric chloride solution that 1.22g mass fraction is 40% and 2.25g mass fraction 0.25% is continuously added after being slowly stirred 5 minutes，After quickly stirring 1 minute，Low rate mixing 10 minutes，Stop stirring，Filter paper filtering after standing 30 minutes，Solid-liquid separation，Filtrate enters second operation work and processes，Add the poly-phosphorus ferric chloride solution that 0.61g mass fraction is 40%，After quickly stirring 1 minute，Low rate mixing 10 minutes，Stop stirring，Filter after standing 30 minutes，Solid-liquid separation，Take filtrate and measure remaining arsenic and all the other heavy metal ion contents.
Before and after wastewater treatment, water quality index data are as shown in table 3:
Water quality index before and after table 3. wastewater treatment
Embodiment 4:
The present invention is directed to arsenic concentration to be about 1500mg/L mine acidic arsenic-containing waste water and process.
Take 300ml smeltery arsenic-containing waste water, add the Fe (CH that 5.07g mass fraction is 25%3COO)2Solution (is now joined), stirring drips 1.12g industry SODIUM PERCARBONATE after making it be completely dissolved, after stirring 30 minutes under room temperature, adding 0.60g mass fraction is the polymeric ferrous sulphate solution of 50%, quickly stirring regulated pH with calcium oxide after 1 minute is 10.82, the poly-ferric sulfate chloride solution that 1.28g mass fraction is 50% and the APAM aqueous solution that 0.84g mass fraction is 0.2% is continuously added after being slowly stirred 5 minutes, at the uniform velocity stirring 10 minutes, stop stirring, filter paper filtering after standing 30 minutes, solid-liquid separation, filtrate adds the poly-ferric sulfate chloride solution of 0.32g mass fraction 50%, continue stirring 5min, stop stirring, solid-liquid separation after standing 30min, take filtrate and measure remaining arsenic and all the other heavy metal ion contents.
Before and after wastewater treatment, water quality index data are as shown in table 4:
Water quality index before and after table 4. wastewater treatment
Embodiment 5:
The present invention is directed to arsenic concentration to be about 9000mg/L smeltery arsenic-containing waste water and process.
Take 400ml smeltery containing arsenic waste acid water, add 8.24gFeSO4·7H2nullO，22.63g potassium peroxydisulfate is added after being uniformly mixed，After stirring 30 minutes under room temperature，Adding 3.88g mass fraction is the polymeric ferrous sulphate solution of 50%，Quickly stirring regulated pH with the lime cream that mass fraction is 30% after 1 minute is 11.76，The polymeric ferrous sulphate solution that 5.72g mass fraction is 50% and the PAAS aqueous solution that 4.80g mass fraction is 0.15% is continuously added after being slowly stirred 5 minutes，After at the uniform velocity stirring 5 minutes，Stop stirring，Filter paper filtering after standing 30 minutes，Solid-liquid separation，Filtrate enters second operation work and processes，Adding 2.44g mass fraction is the polymeric ferrous sulphate solution of 50%，Quickly stir and be slowly stirred 10 minutes，Stop stirring，Filter after standing 30 minutes，Solid-liquid separation，Take filtrate and measure remaining arsenic and all the other heavy metal ion contents.
Before and after wastewater treatment, water quality index data are as shown in table 5:
Water quality index before and after table 5. wastewater treatment
Arsenic slag stability experiment: we compared for rear arsenic slag processed by the invention and after traditional handicraft (lime-iron salt method) processes the leaching arsenic content of arsenic slag, specific operation process following (being People's Republic of China (PRC) state environment protecting standard HJ557-2010 with reference to foundation): applying pressure filter, after first arsenic slag being filtered, obtain initial liquid phase, weigh the arsenic slag (dry solid percentage rate is more than 9%) that butt weight is 100g again, it is placed in 2L extraction flask, it is that 10: 1 (L/Kg) add digestion agent (water by liquid-solid ratio, GB/T6682, two grades), it is vertically fixed on horizontal shaking device after covering tightly bottle cap, regulating frequency of oscillation is 110 ± 10 times/min, amplitude is 40mm, at room temperature take off extraction flask after vibration 8h, stand 16h.When oscillatory process having gas produce, timing should open extraction flask in fume hood, discharge excessive pressure, filter-press installs filter membrane, filter and collect leachate, it is acidified to pH < 2 by after initial liquid phase and leachate mix homogeneously with nitric acid, utilizes By Hydride Generation-atomic Fluorescence Spectrometry detection arsenic content.Experimental result is as shown in table 6:
Table 6. is arsenic slag leaching arsenic content after the present invention and traditional handicraft process
| Sample | Leaching arsenic content (ppm) |
| Traditional handicraft, arsenic slag initial liquid phase mix with leachate after water sample | 7.3460 |
| The present invention, arsenic slag initial liquid phase mix with leachate after water sample | 3.2036 |
Data from table, we it appeared that, under same treatment condition and standing time, relative to traditional handicraft (lime-iron salt method), arsenic slag leaching arsenic content after present invention process reduces significantly, lower than the limit value (As:5mg/L) of regulation in GB5085.3-2007, it is believed that without Leaching, environmental friendliness.
Claims (18)
1. a processing method for arsenic-containing waste water, comprises the following steps:
(1) in arsenic-containing waste water, add ferrous salt and oxidant, obtain solution A；
(2) adding iron salt in solution A, the pH value controlled in arsenic-containing waste water is 8～12, obtains B solution；
(3) adding organic flocculant and inorganic flocculating agent in B solution, stirring carries out first time solid-liquid separation after standing, by slag phase and liquid phase separation.
2. the processing method of arsenic-containing waste water according to claim 1, farther includes: add inorganic flocculating agent in step (3) gained liquid phase, and stirring carries out second time solid-liquid separation after standing.
3. the processing method of arsenic-containing waste water according to claim 1, it is characterised in that step is initially charged ferrous salt in (1) in arsenic-containing waste water, then adds oxidant.
4. the processing method of arsenic-containing waste water according to claim 1, it is characterised in that described ferrous salt at least one in ferrous chloride, ferrous sulfate, ferrous nitrate, iron iodide, ferrous bromide and Ferrous acetate.
5. the processing method of arsenic-containing waste water according to claim 1, it is characterised in that the mol ratio of described ferrous salt and arsenic in waste water is (0.57～2.18): 1.
6. the processing method of arsenic-containing waste water according to claim 5, it is characterised in that the mol ratio of described ferrous salt and arsenic in waste water is (0.61～1.98): 1.
7. the processing method of arsenic-containing waste water according to claim 1, it is characterised in that described oxidant at least one in SODIUM PERCARBONATE, sodium hypochlorite, hydrogen peroxide, potassium peroxydisulfate, Ammonium persulfate., bleaching powder and chlorine dioxide.
8. the processing method of arsenic-containing waste water according to claim 1, it is characterised in that the mol ratio of described oxidant and arsenic in waste water is (0.87～4.56): 1.
9. the processing method of arsenic-containing waste water according to claim 8, it is characterised in that the mol ratio of described oxidant and arsenic in waste water is (1.20～3.70): 1.
10. the processing method of arsenic-containing waste water according to claim 1, it is characterised in that described iron salt at least one in ferric chloride, iron sulfate, bodied ferric sulfate, ferric nitrate, nitrous acid ferrum, thiocyanation ferrum, ferric bromide and iron acetate.
11. the processing method of arsenic-containing waste water according to claim 1, it is characterised in that the mol ratio of described iron salt addition and arsenic in waste water is (0.08～0.39): 1.
12. the processing method of arsenic-containing waste water according to claim 11, it is characterised in that the mol ratio of described iron salt addition and arsenic in waste water is (0.10～0.30): 1.
13. the processing method of arsenic-containing waste water according to claim 1, it is characterised in that the reagent controlling pH is selected from least one in calcium oxide, sodium carbonate, sodium hydroxide and calcium hydroxide.
14. the processing method of arsenic-containing waste water according to claim 1, it is characterised in that described organic flocculant at least one in polyacrylamide (PAM), polyacrylic acid (PAA) and sodium polyacrylate (PAAS).
15. the processing method of arsenic-containing waste water according to claim 14, it is characterised in that the addition of described polyacrylamide is 5～50g/ ton waste water；The addition of described polyacrylic acid or sodium polyacrylate is 1～10g/ ton waste water.
16. the processing method of arsenic-containing waste water according to claim 1, it is characterised in that described inorganic flocculating agent at least one in iron sulfate, aluminium polychlorid, bodied ferric sulfate, poly-ferric sulfate chloride and poly-phosphorus iron chloride.
17. the processing method of arsenic-containing waste water according to claim 1, it is characterised in that the addition of described inorganic flocculating agent is (0.15～0.76) with the mol ratio of arsenic in arsenic-containing waste water: 1.
18. the processing method of arsenic-containing waste water according to claim 17, it is characterised in that the addition of described inorganic flocculating agent is (0.20～0.62) with the mol ratio of arsenic in arsenic-containing waste water: 1.
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| CN110803756A (en) * | 2019-11-19 | 2020-02-18 | 济南大学 | Preparation of a novel compound water treatment oxidant and method for degrading arsenic-containing feed additives in livestock and poultry breeding wastewater |
| CN114349214A (en) * | 2022-01-04 | 2022-04-15 | 湖南云河信息科技有限公司 | Efficient arsenic removal process and device for underground water |
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| CN114956282B (en) * | 2022-05-09 | 2023-09-26 | 同济大学 | Composite coagulation-flocculant and preparation method and application thereof |
| CN114988543A (en) * | 2022-06-20 | 2022-09-02 | 江苏中电创新环境科技有限公司 | Complexing agent for treating arsenic-containing organic wastewater and preparation method and application thereof |
| CN115557647A (en) * | 2022-10-25 | 2023-01-03 | 广西华锡矿业有限公司再生资源分公司 | Method for reducing arsenic content in high-arsenic ion beneficiation wastewater |
| CN116462295A (en) * | 2023-05-05 | 2023-07-21 | 厦门钨业股份有限公司 | Arsenic-containing wastewater treatment method in tungsten smelting process |
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