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:2009201204.:(2006710).:(1972-),,,;:;E2mail:waterblue1972@163.com.1,1,2,1(1.,210098;2.,210098):,,4,,01471109kgöm2,,:;;;;:X703.1:A:100923443(2009)0620644206ImprovingnitrogenremovalofconstructedwetlandsbysupplyingplantcarbonZHAOLian2fang1,ZHUWei1,2,GAOQing1(1.CollegeofEnvironmentalScienceandEngineering,HohaiUniversity,Nanjing210098,China;2.NationalEngineeringResearchCenterofHighEfficientUtilizationofWaterResourcesandEngineeringSafety,HohaiUniversity,Nanjing210098,China)Abstract:Tosolvetheproblemoflownitrogenremovalefficiencyduetotheshortageoforganiccarbon,plantmaterialsrichinorganicmatterwereaddedasanalternativecarbonsourcetothewetlandsystem.Accordingtothereleasecharacteristicsoforganicmatterandthepotentialinfluenceonwaterqualitycausedbytissuedecomposition,reedwaschosenasanavailableplantcarbonsourceinsteadofcornstraw,ricehuskandwoodchips.Vertical2flowconstructedwetlandmicrocosmswereusedtoinvestigatetheim2provementofnitrogenremovalefficiencybysupplyingthereedtotheunits.Theappropriatesupplementamountrangeofreedwas01471109kgöm2underexperimentalconditions.Thevariationofnitrate2Nconcentrationalongthedistanceimpliesthattheorganicmatterreleasedfromreedisakindofavailableor2ganiccarbonsourcefordenitrificationandimprovesnitrogenremovalefficiencyoftheconstructedwetland.Keywords:constructedwetland;nitrogenremoval;carbonsource;plantmaterial;denitrification,,,[1,2],,CöN[35],,[6,7],,,,,,[810],,,4,,,,11111LCöNTNTP10101mgöL,,NaNO3KH2PO42g2mm,,2cm60d,,5d,TNTPpH112640cm15cm,35cm,5mm,n=01533,(OenanthestoloniferaDC),111111,,40L,,75mmöd2008516725,70d,2815C(21113716C)10d,TNTPpH113[11]TN;NO3-2N;NH4+2N;NO2-2NN2(12)2;TP;,;DO;pH22112111114$m,$m=(Ct-C0)V2,:CtC0t;V,1L2g,,3,:,4:5,,1417mg,;,1550,5mg,;,(50)21112,,NP,235466,:1Fig.1ReleasingcharacteristicsofplantmaterialsTNTPCTNCTP,TN10mgöLTP1mgöL,TNTP,(10),TP,TN40,NP,,TNTP,TNTP2TNFig.2ChangesovertimeofTNconcentrationintheeffluentofdifferentplantmaterialsystems,,,NP,,,,3TPFig.3ChangesovertimeofTPconcentrationintheef2fluentofdifferentplantmaterialsystems2124(110kgöm2),nTN,TN80%,10TN60%,10%,(CöN=1,,C,NTN),,4TNFig.4TNremovalpercentsofthereed2suppliedandthecontrolsystems213,,646()10TN10mgöL,75mmöd,113L,TN13mg1,1g4mg,BOD5öTN35,[12],TN217855,11511251100175015kgöm2204060dTN,$mG55TNFig.5Influenceofreedrodsupplementamountonto2talnitrogenremovalefficiency5,204060dTN:,110kgöm2;110kgöm2,TN;110kgöm2,TN80%,110kgöm2,TN,6204060dCOM5TN,:,,,,TN,,7TN:6Fig.6Influenceofreedrodsupplementamountontheorganicmatterconcentrationineffluent7Fig.7AnalysisofappropriatesupplementamountofreedrodG=-015807$M2+113254$M+01102,R2=019608;(1)COM=811762$M+110984,R2=019985(2)2R2,,,TN,10mgöL,(2)1109kgöm2,(1)TN8517%,TN60%,(1)0147kgöm2,,TP014mgöL,,(TN60%),01471109kgöm28110kgöm27466,:CN,L,,20cm,,010cm,9,,CDODO10cm,TNNO3--N8Fig.8Varietyoftheconcentrationofnitrogenalongthedistance9DOFig.9VarietyoftheconcentrationoforganicmatterandDOalongthedistance9DO,10cmCDO015mgöL,,3(1)4,NP,;;,NP(2),01471109kgöm2,TN60%85%,(3),:[1].[M].:,2007.[2]LEEBH,SCHOLZM.WhatistheroleofPhrag2mitesaustralisinexperimentalconstructedwetlandfilterstreatingurbanrunoff?[J].EcologicalEngi2neering,2007,29(1):87295.[3],,,.CöN[J].,2008,28(7):6032607LIAOXiao2shu,HEFeng,XUDong,etal.Influ2enceoflowCöNonnitrificationanddenitrificationinwetlands[J].ChinaEnvironmentalScience,2008,28(7):6032607.(inChinese).[4],,.[J].,2006,26(11):182121827.ZHAOLian2fang,ZHUWei,ZHAOJian.Nitrogenremovalmechanisminconstructedwetlandusedfortreatingpollutedriverwaterwithlowerratioofcar2bontonitrogen[J].ActaScientiaeCircumstantiae,2006,26(11):182121827.(inChinese).[5],,,.[J].,2004,23(4):7572760.WUZhen2bin,XUGuang2lai,ZHOUPei2jiang,et846()10al.Removaleffectsofnitrogeninintegratedverticalflowconstructedwetlandsewagetreatingsystem[J].JournalofAgro2environmentalScience,2004,23(4):7572760.(inChinese).[6]HUETTDO,MORRISSG,SMITHGetal.Nitro2genandphosphorusremovalfromplantnurseryrunoffinvegetatedandunvegetatedsubsurfaceflowwetlands[J].WaterResearch,2005(39):325923272.[7]LINYing2feng,JINGShuk2ren,WANGTze2wen,etal.Effectsofmacrophytesandexternalcarbonsourcesonnitrateremovalfromgroundwaterincon2structedwetlands[J].EnvironmentalPollution,2002(119):4132420.[8]PHIPPSRG,CRUMPTON,WG.Factorsaffectingnitrogenlossinexperimentalwetlandswithdifferenthydrologicloads[J].EcologicalEngineering,1994,3(4):3992408.[9]FLEMING2SINGERMS,HORNEAJ.Enhancednitrateremovalefficiencyinwetlandmicrocosmsus2inganepisedimentlayerfordenitrification[J].Envi2ronmentalScienceandTechnology,2002(36):123121237.[10]INGERSOLTL,BAKERLA.Nitrateremovalinwetlandmicrocosm[J].WaterResearch,1998,32(3):6772684.[11].[M].4.:,2002.[12].[D].:,2008.(:)9466,: