人工湿地处理低碳氮比污染河水时的脱氮机理

2611200611ActaScientiaeCircumstantiaeVol.26,No.11Nov.,2006:(863)(No.2003AA601100);(No.BK2006710)SupportedbytheHi2TechResearchandDevelopmentProgramofChina(863Program)(No.2003AA601100)andNaturalScienceFoundationofJiangsuProvince(No.BK2006710):(1972),,().E2mail:[e-mail],Tel:[phone];3(),E2mail:[e-mail]:ZHAOLianfang(1972),female,prelector(Ph.D.),E2mail:[e-mail],Tel:[phone];3Correspondingauthor,E2mail:[e-mail],,.2006.[J].,26(11):1821-1827ZhaoLF,ZhuW,ZhaoJ.2006.Nitrogenremovalmechanisminconstructedwetlandusedfortreatingpollutedriverwaterwithlowerratioofcarbontonitrogen[J].ActaScientiaeCircumstantiae,26(11):1821-18271,2,1,2,3,21.,2100982.,210098:2006202208:2006209225:2006209226:,,.,30cm,,;,;,,,.:;;;;:025322468(2006)1121821207:X522:ANitrogenremovalmechanisminconstructedwetlandusedfortreatingpollutedriverwaterwithlowerratioofcarbontonitrogenZHAOLianfang1,2,ZHUWei1,2,3,ZHAOJian21.CollegeofEnvironmentalScienceandEngineering,HohaiUniversity,Nanjing2100982.StateKeyLaboratoryofHydrology2WaterResourcesandHydraulicEngineering,HohaiUniversity,Nanjing210098Received8Feburary2006;receivedinrevisedform25September2006;accepted26September2006Abstract:TakenthecontaminatedseriouslyZhenjiangOldCanalasanpollutedwaterexampleoflowerratioofcarbontonitrogen,thenitrogenremovalmechanisminconstructedwetlandwiththeintegratedvertical2flowgravel2bedconstructedwetlandmicrocosmwasinvestigated.Basedontheexperiments,threeconclusionsshowedthatnitrogenwasmostlyremovedinsurfacelayer(030cm)andtheremovalmechanismwascomposedofsuspended2nitrogenfiltrationofmediumandplantroots,whilethedissolvednitrogenwasremovedbynitrificationanddenitrificationofmicroorganismsandabsorptionofhydrophytes.OwingtoLackofcarbonsourceunderlayer,denitrificationwasinhibitedandlittlenitrogenwasremoved.Supplyingorganiccarbonsourcewasaneffectivemethodtoimprovenitrogenremovalefficiencyfornitrate2nitrogenrichwastewater,whileitwasnotvalidobviouslytohighammoniumconcentrationwastewater.Keywords:constructedwetland;pollutedriver;ratioofcarbontonitrogen;nitrogenremoval;mechanism1(Introduction)2070.,(,1999),(Patrick,1997).,,(Davidetal.,2002;26,2004;Majeretal.,1997)(Vrhovsek,1996;Jietal.,2002)(Greenetal.,1996,Scholesetal,1998)(Braskerud,2002;Raisinetal.,1995),.80,1987(,1992),1990;,(,1999).,,(,2003;,2005),(Liangetal.,2004;,2003),.,,.,.,CODCr500mgL-1TN40mgL-1,TP8mgL-1(,2003);N,,,COD80mgL-1,20mgL-1,1.0(,2003).,,,(particulate)(particle-band).,,,(Sakadevanetal.,1999).,.863,,,.2(Methods)2.1,1.1Fig.1Schematicmapofintegratedvertical2flowconstructedwetlandmicrocosm21m1m1m,,1.0m0.2m.,48mm,,.85cm,75cm,10cm.,,,0cm,1().,2005216m-2,,4d.4,,,40m-2,.,6m3,228111:,,.,.2.2:6m3,,5m3.,750mmd-1,42430,3dTNTDNCODMnDO.:38624,7d,TNTDN.TDN()0.45m,TN,TNTDN(TSN);TSNNH+42NNO-32NNO-22N.,TSNTN20%30%.TNTDNTSN,TN,,,,NH4HCO3,KH2PO4,1.51,,1,CODMnTNTDNNH+42NNO-32NNO-22N.1(426)Table1Concentrationofpollutantsinoldcanalriverandsyntheticwastewater/(mgL-1)CODMnTNTP12.525.003.6212.005.003.50:TN5mgL-1,,CODMn102030405060mgL-1,CODMn/TN24681012,NO-32NNH+42NKNO3NH4HCO3.,TNTDN()NH+42NNO-32NNO-22NTPCODMnDO.2.3TPTNNH+42NNO-32NNO-22NCODMn(,2002),DOSENSION651850210.3(Results)3.1TN40%,.42417426TN,2.2TNFig.2Totalnitrogenremovalefficiencyalongthedistance2,TN34%42%,(0cm85cm)80%,4290%,(85cm160cm)TN10%;(0cm30cm,30cm),30cm80%.,TN,,.417TN426,:417426.,417TN2167mgL-1,TDN1.10mgL-1,TN58.8%;426TN5.00mgL-1,TDN3.86328126mgL-1,TN22.8%,,417TN;,426,TN5.00mgL-1,417TN2.67mgL-1,426TN;,,.(TSN)(TN20%30%),,,,3.TNTDNTSN,TNTDNTSN.3,(030cm)TN,TDN,TSN,TNTSN,.(030cm)TDN,TDN,(3085cm)(85160cm).(30160cm)TSN,TNTDN,,TN(140cm160cm)TDN.TN(3),(030cm)TDN,NH+42N(pH8)TN,TDN.TDN,TDN,;(030cm)TSN,TDN.,3050cmTDNTN,.,,TN,.3TN(426,510)Fig.3Variationwithdistanceoftotalnitrogeninriverwaterandsyntheticwastewater3.23,,,.N,,,,,.,KNO3,TNC/N,4.4TNC/NFig.4TotalnitrogenremovalefficiencyandC/Nvariationwithdistancefore2and2aftersupplyingorganiccarbon4,C/N=2426,428111:;C/N=8(NKNO3).4,(C/N=8),TN(C/N=2)55%89%,(3085cm)(85160cm).,TN21%,,TN44%.4,C/N=2,C/N2,,TN;,C/N,,TN.C/N=8,C/N8,,,TN,C/N10,20,N,NO-32N.,TN,TN.3.3-,4,.NO-32NNH+42N2,,NO-32NNH+42N,,5.5C/NTNFig.5EffectofC/Ntototalnitrogenremovalefficiency5,NO-32N,TN,TNC/N255%C/N1294%,NO-32N,TNNO-32NN2,,TN;,NH+42N,,NH+42N,.NH+42N,C/N=2C/N=10NH+42N,CODDO,67.6Fig.6Nitrogenformsvariationwithdistance7CODMnDOFig.7CODMnandDOvariationwithdistance6NH+42N.,(C/N=2),NH+42N(030cm),,30cmNO-32NNO-22N,,0.7mgL-1NO-32N.7,DO0.5mgL-1,NH+42N,C/N2,,NO-32NN2,TN.528126C/N,C/N=10,C/N=2,30cmNO-32N,0.7CODMnDO,DO0.5mgL-1,DO,30cm,DO0.5mgL-1.,C/N=10CODMn,,DO,NH+42N,NO-32N;,NH+42NNO-32N,NO-32N0.TNNO-32N,TN.,,.NO-32N,TN;NH+42N,,.,,.4(Conclusions)1),.2);,.3),.4),NO-32N;NH+42N,,.:(1962-),,,,..Tel:[phone]();E2mail:[e-mail]:AnSQ.2003.WetlandEcologicalengineeringOptimizationModelofutilizationandprotectionofwetland[M].Beijing:ChemicalIndustryPress(inChinese)BaiXH,WangBZ,YuMin,etal.1999.DevelopmentofconstructedwetlandwastewatertreatmenttechnologyanditsapplicationinChina[J].JournalofHarbinUniversityofCivilEng