化学沉淀法处理高浓度含磷废水

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INDUSTRIALWATER&WASTEWATERVol.43No.4Aug.,2012、、、[1]。,,20mg/L,,,,,[2-3]。,,,。,、。,,,,[1]。[4-5][6-7],。、[8-9],,、,[10]。,,、、pH、、,。11.1:pHB-4pH,723,,。:CaCl2、NaOH、HCl、H2O2。1.2,[11]:,、pH、。,,n(Ca)∶n(P)=1.5∶1,pH9.50,25℃,30min,99.90%。:;;;:X703.1;X781.1:A:%1009-2455(2012)04-0024-03Treatmentofhighconcentrationphosphorus-containingwastewaterbychemicalprecipitationGAOWei-sheng(AnhuiProvinceChemicalIndustryDesignInstitute,Hefei230009,China)Abstract:Precipitationprocesswithcalciumchlorideastheprecipitantwasusedtotreathighconcentra-tionphosphorus-containingwastewater,theeffectsofcalciumchloridedosage,pHvalue,reactiontemperatureandreactiontimeonphosphorusremovalwereinvestigated.Theresultsshowedthat,calciumchloridehadgoodremovalabilityforphosphorus,whenthen(Ca)∶n(P)was1.5∶1,thepHvaluewas9.50,thereactiontemperaturewas25℃,thereactiontimewas30min,theremovalrateofphosphorusreached99.90%.Keywords:highconcentrationphosphorus-containingwastewater;phosphorusremoval;chemicalprecipita-tion;calciumchloride(,230009)·24·1、Tab.1CharacteristicsofwastewaterbeforeandafterpretreatmentpHρ(Ni)/(mg·L-1)ρ()/(mg·L-1)4.301862.55837.92<1.05821CaCl2Fig.1EffectofCaCl2dosageontotalphosphorusremoval1.01.11.21.31.41.51.61.71.8n(Ca)∶n(P)ρ()/(mg·L-1)76543210/%100.099.899.699.499.299.02pHFig.2EffectofpHvalueontotalphosphorusremoval78910111213pHρ()/(mg·L-1)14121086420/%100.099.599.098.598.097.597.0,30mL/LH2O2,30%NaOHpH11.50,1h,HClpH7.00~8.00,。,H2O2,,。、1。1.3,5%NaOHpH,CaCl2,,(150r/min),。1.4EDTA[12];[13]。22.1:5Ca2++7OH-+3H2PO4-→Ca5(OH)(PO4)3↓+6H2O(1)3Ca2++2PO43-→Ca3(PO4)2↓(2)Ca2++HPO42-→CaHPO4↓(3)CaSO4、CaO、Ca(OH)2、CaCl2、Ca(ClO)2,Ca(OH)2,CaSO4,,,Ca(OH)2、CaOpH。,CaCl2。2.2CaCl250mL,5%NaOHpH9.50,CaCl2,25℃30min,,1。1,、,,、1.5,CaCl2,99.90%,0.590mg/L,。,n(Ca)∶n(P)=1.5∶1,[14],H2O2,HPO42-PO43-,(1)~(3),CaCl2。2.3pH50mL,5%NaOHpH,n(Ca)∶n(P)=1.5∶1CaCl2,25℃30min,,2。2,pH7.92~9.50,pH,pH9.50,pH。,pH11.00,,,,,OH-Ca2+Ca(OH)2[15],。pH9.50,0.590mg/L,99.90%。:·25·INDUSTRIALWATER&WASTEWATERVol.43No.4Aug.,20123Fig.3Effectofreactiontemperatureontotalphosphorusremoval20304050607080/℃ρ()/(mg·L-1)0.600.590.580.570.560.54/%99.9299.9199.9099.8999.884Fig.4Effectofreactiontimeontotalphosphorusremoval010203040506070/minρ()/(mg·L-1)2.42.01.61.20.80.4/%100.099.999.899.799.62.450mL,5%NaOHpH9.50,n(Ca)∶n(P)=1.5∶1CaCl2,30min,,3。3,,。,,,。3,25℃75℃,30min0.590mg/L0.545mg/L,99.90%99.91%,。,25℃。2.550mL,5%NaOHpH9.50,n(Ca)∶n(P)=1.5∶1CaCl2,25℃,,4。4,30min,,30min,,,30min,0.590mg/L。,30min。3(1):n(Ca)∶n(P)=1.5∶1,pH9.50,25℃,30min,0.590mg/L,99.90%。(2),,,。:[1],,,.[J].,2009,35(12):16-21.[2],.[J].,2004,23(2):98-101.[3]WanYazhen,LiuJindun,LuWeicai,etal.Studyonremovingphosphorusfromindustrialwastewatercontainingphosphorus[J].IndustuialMineralsandProcessing,2002,(8):19-24.[4],,,.[J].,2006,37(6):65-67.[5],,,.[J].,2009,31(5):117-121.[6],,,./[J].,2011,37(2):85-89.[7],,,.[J].,2009,28(1):43-46.[8],,,.[J].,2011,42(4):23-26.[9],,,.[J].,2006,37(4):77-79.[10]G.()[M].:,1985.[11],,.[J].,2011,31(5):44-46.[12].[M].:,2002.[13]GB11893—1989,[S].[14],.[J].,2011,31(1):58-60.[15].[M].:,2004.:(1984-),,,,,,()0551-4661629()gaows1018@163.com。:2012-07-13·26·

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