赤泥亚铁混合材料强化混凝除铬研究陈浩

、、、。。Cr(VI)Cr(III)100。Cr(VI)、、、、[1]。。Cr(VI)Cr(III)NaOHFe3+Cr3+Fe(OH)3Cr(OH)3[2]。。。、、。、、、[3]。。11.1、、、、、。。0.45μm75、96、120、180、380μm。1.21.2.1200mL30mg·L-1Cr(VI)250mLJTY18min3min200r·min-115min70r·min-130min2cm。、、pH。。0.45μm。1.2.2NaOHpH。1,211211.1000852.310014。Fe(II)Cr(VI)3:113:1296μmpH6.7。30mg·L-198.5%Cd2+Ni2+。。X703.1A1000-3770(2011)12-0015-0052011-05-168632008AA06A409-3“”[e-mail][e-mail]3712201112TECHNOLOGYOFWATERTREATMENTVol.37No.12Dec.,201115DOI:10.16796/j.cnki.1000-3770.2011.12.004NaOHpH1A、B。1.2.3Cd(II)Ni(II)30mg·L-1。1.3leemenProdigyHACH2100NISTurbidimeterpHMETTLERTOLEDOpHFE-20ζMalvernZetaZetasizer2000)MalvernMastersizer200030kVHITACHIS-3000N。22.1Fe(II)Cr(VI)21、3141。2。2。Fe(II)Cr(VI)213141Fe(II)。Fe(II)[2,4]。Fe(II)Cr(VI)310.48g·L-10.52g·L-11312。2.2Fe(II)Cr(VI)3175、96、120、180、380μm0.52g·L-1。3。3180μm。96μm。96μm。2.3pHFe(II)Cr(VI)3:10.52g·L-1HClNaOHpH1Fig.1Schematicdiagramofsettlingvatρ/g·L-12Fig.2Effectofredmuddosageontheremovalofchromium0.00.10.20.30.40.50.60.7020406080100
/%n(Fe(II):n(Cr(VI))2:13:14:1/μm3Fig.3Effectofredmudparticlesizeontheremovalofchromium020406080100
/%75961201803803712161。1pHpH6.798.49%。pH。pH、ζpH[2,5]。HClNaOH、0.52g·L-10.52g·L-1pHζpHζ4。4ζpHζ。ζpHpH6.7ζζpHζ。pH6.7。2.4。Fe(II)Cr(VI)31HCl0.52g·L-1pH5。51200s23.2μm400s130.8μm。SEM6。6a6b。。2.5Fe(II)Cr(VI)3196μmNaOHpH。2。4.445.816.446.737.3178.3395.6196.8998.8398.4782.1099.6299.8699.9099.9075.4091.2293.5996.7796.6378.6295.5896.7998.6398.652Tab.2EffectofredmudandNaOHonCr(VI)removalratepH/%NaOH/%92.8896.1798.4998.1598.021pHTab.1EffectofpHontheremovalofchromiumpH4.925.876.707.217.824pHζFig.4ζpotentialsofsolutionatdifferentpH345678-30-25-20-15-10-50510pH
   ζ/mV5Fig.5Thechangeofflocsizewithreactiontime02004006008001,0001,2001,400020406080100120140
/mt/s  6b0.52g·L-16a6SEMFig.6SEMphotographsofFloc172pHpH=6.7。pHNaOH。、[6]。pHNaOH。。[7]。7A、BNaOHNaOH。。。2.6Cr6+Cd2+Ni2+。[8-12]。89。89Cd2+0.3g·L-1Ni2+0.22g·L-1。0.4g·L-199.5%0.52g·L-198.5%。。Fe2+Cr2O72-Fe3+Cr3+pHCr6+Cr3+[13]pHpH/g·L-19Ni2+Fig.9EffectofNi2+ontheremovalofchromium0.00.10.20.30.40.50.60.70.8020406080100
%    7Fig.7ThesettlingofFloc0102030405060020406080100120
% min/g·L-18Cd2+Fig.8EffectofCd2+ontheremovalofchromium0.00.10.20.30.40.50.60.70.8020406080100
%    371218REMOVALOFCHROMIUMBYENHANCEDCOAGULATIONPROCESSUSINGREDMUDCOMBINEDWITHFERROUSSULFATEChenHao1,2,LiYiran1,WangJun1,WangHongyu2,LuanZhaokun1(1.ResearchCenterforEco-EnvironmentalSciences,ChineseAcademyofSciences,Beijing100085,China;2.ZhejiangUniversityofTechnology,Hangzhou310014,China)Abstract:Theeffectandmechanismofchemicalcoagulationprocessusingredmudcombinedwithferroussulfateontheremovalofchromiumwerestudied.Theresultsshowedthattheoptimalconditionswereasfollows:themolarratioofFe(II)andCr(VI)was3:1,themassratioofredmudandferroussulfatewas13:12,thesieveporesizeforredmudwas96μm,thepHvalueofsolutionwasadjustedto6.7.Theremovalpercentageof98.5%wasattainedundertheoptimalconditionstoremovethechromiumof30mg·L-1wastewater.Comparedwiththetraditionalchemicalcoagulationprocess,ratioofchromiumeliminationandsettleabilityofflocswereimprovedusingredmudcombinedwithferrousmaterialsascoagulant.TheeffectofCd2+andNi2+ontheremovalofchromiumwasalsostudiedintheexperiment.Keywords:redmud;ferroussulfate;enhancedcoagulation;removalofchromium0.4g·L-199.5%99.9%96.6%99.9%3.3%、[14-15]。Cd2+Ni2+。31312pH6.798.5%。1003。ζ、ζ。。Cd2+Ni2+。[1].[J].,2009(11):101.[2],,.[J].,2008,28(9):37-39.[3],,.[J].,2010,42(2):5-8.[4],,.[J].,2000,19(2):25-28.[5],.[J].,2001,16(1):18-19.[6],.[J].,2005,25(2):132-136.[7],,.[J].,2007,26(5):638-641.[8],.[J].,2008,40(8):47-49.[9],.[J].,2010,34(1):92-97.[10],.[J].,2000(3):10-15.[11],,,.[J].,2007,27(9):3811-3819.[12]ElliottHA,MRLiberati,CPHuang.Competitiveadsorptionofheavymetalsbysoils[J].JournalofEnvironmentalQuality,1986,15(3):215-219.[13]CNamasivayam,KRanganathan.WasteFe(III)/Cr(III)hydroxideasadsorbentfortheremovalofCr(VI)fromaqueoussolutionandchromiumplatingindustrywastewater[J].EnvironmentalPollution,1993,82:255-261.[14]CNamasivayam,KRanganathan.RecyclingofwasteFe(III)/Cr(III)hydroxidefortheremovalofnickelfromwastewater:Adsorptionandequilibriumstudies[J].WasteManagement,1994,14(8):709-716.[15]CNamasivayam,KRanganathan.RemovalofCd(II)fromwastewaterbyadsorptionon“waste”Fe(III)/Cr(III)hydroxide[J].WaterResearch,1995,29(7):1737-1744.19