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20519999ENVIRONMENTALSCIENCEVol.20,No.5Sep.,1999赵庆良(,150090)李湘中()NH+4-N,MgCl26H2ONa2HPO412H2OMgOH3PO4NH+4-N.,MgCl26H2ONa2HPO412H2OMg2+NH+4PO3-4111,pH8.59.0NH+4-N5618mg/L65mg/L;2MgO85%H3PO4,NH+4-N5404mg/L1688mg/L.,,,.:,35,,:1998-10-17Ammonia-nitrogenRemovalfromLandfillLeachatebyChemicalPrecipitationZhaoQingliang(SchoolofMunicipal&Environ.Eng.,HarbinUniversityofCivilEngineering&Architecture,Harbin150090,China)LiXiangzhong(DepartmentofCivil&StructuralEngineering,TheHongKongPolytechnicUniversity,HongKong,China)AbstractToremoveefficientlyhighstrengthofammonia-nitrogenfromlandfillleachateandtoavoidcarbonatescalingproblemsinaconventionalair-strippingtower,alab-scalestudywasconductedtoprecipitatetheammoni-aintheformofmagnesiumammomumphosphatebyapplyingsuchchemicalsasMgCl26H2OandNa2HPO412H2OorMgOand85%H3PO4withdifferentstoichiometricratios.TheexperimentalresultsdemonstratedthatNH+4-Nwaseffectivelyremovedfrominitial5618mg/Ldowntofinal65mg/LwhentheratioofMg2+NH+4PO3-4wascontrolledat111byusinganalyticalgradechemicalsofMgCl26H2OandNa2HPO412H2O,withtheoptimalpHfortheprecipitationabout8.59.0.TheothertwochemicalsofMgOand85%H3PO4werealsotestedandfoundtobenotasefficientasMgCl26H2OandNa2HPO412H2Otopre-cipitateNH+4-N,whichremovedNH+4-Nfrominitial5404mg/Lonlydowntofinal1688mg/Latthesameexperi-mentalconditions.Keywordslandfillleachate,ammonia-nitrogen,precipitation,magnesiumammoniumphosphate.[14].,NH+4-N[59],lt[9],20%[6].NH+4-N.1(WENT),.500mlpH.MgCl26H2ONa2HPO4l2H2OMgO85%H3PO4NH+4-N,15min,pH.,15minNH+4-N.10mol/LNaOHpHpHNH+4-N.pHNH+4-N(OrionEA940),CODBOD5(VFA)(TSS)(VSS)(TDS)(FDS)[10].22.11993-11,[11],40m3/d,COD60007000mg/L,BOD5/COD0.22,NH+4-N5000mg/L,(1).,,NH+4-N[12].1/mgL-1/Hazen7800Cl-3032VFA420pH8.22K3920/mbocm-137000Na2505/NTU4100Ca13.7COD7511Mg93COD6508Fe3.811BOD51436Mn0.182TSS784Ni0.365VSS654Cu0.120TDS12352Zn1.155FDS9420Cr0.553NH+4-N5000Cd0.103PO3-4-P16.3Pd(CaCO3)13195(0.01)2.2NH+4-NMgNH4PO46H2O00.023g/100ml,:Mg2+NH+4PO3-4MgNH4PO46H2OpKs=12.6(25)MgNH4PO46H2O245,1gNH+4-N17.5gMgNH4PO46H2O.NPMg,[7],[13].MgNH4PO46H2O,Mg2+NH+4PO3-4111,,Mg2+NH+411PO3-4(Na2HPO412H2O),NH+4PO3-411Mg2+(MgCl26H2O),12.,Mg2+NH+4PO3-4111,NH+4-N5618mg/L172mg/L,10%Mg2+PO3-4NH+4-N112mg/L158mg/L,Mg2+PO3-4NH+4-N,Mg2+NH+4PO3-4111.1PO3-4NH+4-NpH(Mg2+NH+411,MgCl26H2ONa2HPO412H2O)2Mg2+NH+4-NpH(NH+4PO3-411,MgCl26H2ONa2HPO412H2O)Mg2+NH+4PO3-4111915,pH,pHNH+4-NpH10mol/LNaOH3.3,MgCl26H2ONaHPO412H2O,pH8.866.74,NH+4-N210mg/L,pH8.64,NH+4-N65mg/L.,NH+4-NMgNH4PO46H2OpH8.59.0.3pHNH+4-N(MgCl26H2ONa2HPO412H2O)Mg2+NH+4PO3-4111,2MgO85%H3PO4pH,4.,MgOH3PO4,pH8.105.32,NH+4-N2150mg/L,pH8.50,NH+4-N1688mg/L,NH+4-N69%,MgO.4pHNH+4-N(MgO85%H3PO4)3BOD5/COD(0.22),NH+4-N5000mg/L,.NH+4-NMgNH4PO46H2O,,.MgCl26H2ONa2HPO412H2OMg2+NH+4PO3-4111,pH8.59.0NH+4-N5618mg/L65mg/L,98%.1ShultzBandKjeldsenP.Screeningoforganicmatterinleachatesfromsanitarylandfillsusinggaschromatogra-phycombinedwithmassspectrometry.Wat.Res.,1986,20(8):9659702Halling-SrensenBandJrgensenSE.Theremovalofni-trogencompoundsfromwastewater.LondonandNewYork:ElsevierSciencePublishersB.V.,1993.123ChristensenTHetal.LandfillingofWaste:Leachate.LondonandNewYork:ElsevierSciencePublishers,1992.4174284ChristensenTHetal.LandfillingofWaste:Leachate.LondonandNewYork:ElsevierSciencePublishers,1992.3133215TnayOetal.Ammoniaremovalbymagnesiumammoni-umphosphateinindustrialwastewaters.Wat.Sci.Tech-nol.,1997,36(23):2252286KluteRetal.ChemicalWaterandWastewaterTreatment.Berlin:SpringVerlag,1994.4574657SiegristH.Nitrogenremovalfromdigestersupernatant-comparisonofchemicalandbiologicalmethods.Wat.Sci.Technol.,1996,34(12):3994068ZdybiewskaMWandKulaB.RemovalofammoniaNi-trogenbytheprecipitationmethod,ontheexampleofsomeselectedwastewaters.Wat.Sci.Technol.,1991,24(7):229234.9Schulze-RettmerR.Thesimultaneouschemicalprecipita-tionofammoniumandphosphateintheformofmagne-sium-ammonium-phosphate.WatSci.Technol.,1991,23:65966710APHA.StandardMethodsfortheExaminationofWaterandWastewater(16thed.),WashingtonDC:AmericanPublicHealthAssociation,198511HenryJGetal.Removaloforganicsfromleachatesbyanaerobicfilter.Wat.Res.,1987,21(11):1395139912LiXZandZhaoQL.Inhibitionofmicrobialactivityofactivatedsludgebyhighstrengthofammonia-nitrogeninleachate.Paperpresentedin19thIAWQBiennialInterna-tionalConference&Inhibition,2126June,1998,Van-couver,Canada13PerryDLandPhilipsSL.HandbookofInorganicCom-pounds.USA:CRCPressInc.,1995.2359220