化学沉淀法去除垃圾渗滤液的中的氨氮

20519999ENVIRONMENTALSCIENCEVol.20,No.5Sep.,1999(,150090)()NH+42N,MgCl26H2ONa2HPO412H2OMgOH3PO4NH+42N.,MgCl26H2ONa2HPO412H2OMg2+NH+4PO3-4111,pH815910NH+42N5618mgöL65mgöL;2MgO85%H3PO4,NH+42N5404mgöL1688mgöL.,,,.:,35,,:1998210217Ammonia-nitrogenRemovalfromLandfillLeachatebyChemicalPrecipitationZhaoQingliang(SchoolofMunicipal&Environ.Eng.,HarbinUniversityofCivilEngineering&Architecture,Harbin150090,China)LiXiangzhong(DepartmentofCivil&StructuralEngineering,TheHongKongPolytechnicUniversity,HongKong,China)AbstractToremoveefficientlyhighstrengthofammonia2nitrogenfromlandfillleachateandtoavoidcarbonatescalingproblemsinaconventionalair2strippingtower,alab2scalestudywasconductedtoprecipitatetheammoni2aintheformofmagnesiumammomumphosphatebyapplyingsuchchemicalsasMgCl26H2OandNa2HPO412H2OorMgOand85%H3PO4withdifferentstoichiometricratios.TheexperimentalresultsdemonstratedthatNH+42Nwaseffectivelyremovedfrominitial5618mgöLdowntofinal65mgöLwhentheratioofMg2+NH+4PO3-4wascontrolledat111byusinganalyticalgradechemicalsofMgCl26H2OandNa2HPO412H2O,withtheoptimalpHfortheprecipitationabout815910.TheothertwochemicalsofMgOand85%H3PO4werealsotestedandfoundtobenotasefficientasMgCl26H2OandNa2HPO412H2Otopre2cipitateNH+42N,whichremovedNH+42Nfrominitial5404mgöLonlydowntofinal1688mgöLatthesameexperi2mentalconditions.Keywordslandfillleachate,ammonia2nitrogen,precipitation,magnesiumammoniumphosphate.[14].,NH+42N[59],lt[9],20%[6].NH+42N.1(WENT),.500mlpH.MgCl26H2ONa2HPO4l2H2OMgO85%H3PO4NH+42N,15min,pH.,15minNH+42N.10molöLNaOHpHpHNH+42N.pHNH+42N(OrionEA940),CODBOD5(VFA)©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.______________________________________________________________(TSS)(VSS)(TDS)(FDS)[10].22111993211,[11],40m3öd,COD60007000mgöL,BOD5öCOD0122,NH+42N5000mgöL,(1).,,NH+42N[12].1ömgL-1öHazen7800Cl-3032VFA420pH8122K3920öLmbocm-137000Na2505öNTU4100Ca1317COD7511Mg93COD6508Fe31811BOD51436Mn01182TSS784Ni01365VSS654Cu01120TDS12352Zn11155FDS9420Cr01553NH+42N5000Cd01103PO3-42P1613Pd(CaCO3)13195(0101)212NH+42NMgNH4PO46H2O001023gö100ml,:Mg2+NH+4PO3-4MgNH4PO4õ6H2OpKs=1216(25)MgNH4PO46H2O245,1gNH+42N1715gMgNH4PO46H2O.NPMg,[7],[13].MgNH4PO46H2O,Mg2+NH+4PO3-4111,,Mg2+NH+411PO3-4(Na2HPO412H2O),NH+4PO3-411Mg2+(MgCl26H2O),12.,Mg2+NH+4PO3-4111,NH+42N5618mgöL172mgöL,10%Mg2+PO3-4NH+42N112mgöL158mgöL,Mg2+PO3-4NH+42N,Mg2+NH+4PO3-4111.1PO3-4NH+42NpH(Mg2+NH+411,MgCl26H2ONa2HPO412H2O)2Mg2+NH+42NpH(NH+4PO3-411,MgCl26H2ONa2HPO412H2O)Mg2+NH+4PO3-4111195©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.中国科技论文在线______________________________________________________________öLNaOH3.3,MgCl26H2ONaHPO412H2O,pH81866174,NH+42N210mgöL,pH8164,NH+42N65mgöL.,NH+42NMgNH4PO46H2OpH815910.3pHNH+42N(MgCl26H2ONa2HPO412H2O)Mg2+NH+4PO3-4111,2MgO85%H3PO4pH,4.,MgOH3PO4,pH81105132,NH+42N2150mgöL,pH8150,NH+42N1688mgöL,NH+42N69%,MgO.4pHNH+42N(MgO85%H3PO4)3BOD5öCOD(0122),NH+42N5000mgöL,.NH+42NMgNH4PO46H2O,,.MgCl26H2ONa2HPO412H2OMg2+NH+4PO3-4111,pH815910NH+42N5618mgöL65mgöL,98%.1ShultzBandKjeldsenP.Screeningoforganicmatterinleachatesfromsanitarylandfillsusinggaschromatogra2phycombinedwithmassspectrometry.Wat.Res.,1986,20(8):9659702Halling2SrensenBandJrgensenSE.Theremovalofni2trogencompoundsfromwastewater.LondonandNewYork:ElsevierSciencePublishersB.V.,1993.123ChristensenTHetal.LandfillingofWaste:Leachate.LondonandNewYork:ElsevierSciencePublishers,1992.4174284ChristensenTHetal.LandfillingofWaste:Leachate.LondonandNewYork:ElsevierSciencePublishers,1992.3133215TnayOetal.Ammoniaremovalbymagnesiumammoni2umphosphateinindustrialwastewaters.Wat.Sci.Tech2nol.,1997,36(23):2252286KluteRetal.ChemicalWaterandWastewaterTreatmentÊ.Berlin:SpringVerlag,1994.4574657SiegristH.Nitrogenremovalfromdigestersupernatant2comparisonofchemicalandbiologicalmethods.Wat.Sci.Technol.,1996,34(12):3994068ZdybiewskaMWandKulaB.RemovalofammoniaNi2trogenbytheprecipitationmethod,ontheexampleofsomeselectedwastewaters.Wat.Sci.Technol.,1991,24(7):229234.9Schulze2RettmerR.Thesimultaneouschemicalprecipita2tionofammoniumandphosphateintheformofmagne2sium2ammonium2phosphate.WatSci.Technol.,1991,23:65966710APHA.StandardMethodsfortheExaminationofWaterandWastewater(16thed.),WashingtonDC:AmericanPublicHealthAssociation,198511HenryJGetal.Removaloforganicsfromleachatesbyanaerobicfilter.Wat.Res.,1987,21(11):1395139912LiXZandZhaoQL.Inhibitionofmicrobialactivityofactivatedsludgebyhighstrengthofammonia2nitrogeninleachate.Paperpresentedin19thIAWQBiennialInterna2tionalConference&Inhibition,2126June,1998,Van2couver,Canada13PerryDLandPhilipsSL.HandbookofInorganicCom2pounds.USA:CRCPressInc.,1995.2352920©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.中国科技论文在线______________________________________________________________