不同构型湿地氧分布及脱氮效果对比

第31卷第6期土木建筑与环境工程Vol.31No.62009年12月JournalofCivil,Architectural&EnvironmentalEngineeringDec.2009黄娟1,王世和1,钟秋爽2,鄢璐1(1.东南大学市政工程系,南京210096;2.江苏省建设厅科技发展中心,南京210013):2009-07-05:(50909019,50278016):(1980-),,,,(E-mail)[e-mail]:通过2组对比试验(垂直流与水平流湿地单段式与三段式水平流湿地),考察了不同构型湿地中溶解氧的分布情况及脱氮效果结果表明:不同构型人工湿地水力流态的区别,导致了床体溶解氧分布和脱氮效果的差异垂直流人工湿地独特的结构设计和水力流态更有利于湿地内部的供氧,局部氧浓度可比水平流湿地高0.17mg/L;脱氮效果优于相同运行条件下的水平流湿地,NH+4-NTN去除率分别可提高约9%5%三段式水平流湿地通过接触槽内复氧,有效改善了溶解氧分布,利于硝化反应进行,NH+4-N去除率最高达66%,TN去除率最高达71%,分别比单段式湿地提高约8%和5%此外,三段式湿地在较低水位下运行仍能取得较好的脱氮效果,其最佳停留时间的范围也得以延展:构型;溶解氧;人工湿地;脱氮效果:X52:A:1674-4764(2009)06-0117-05ComparisonofDissolvedOxygenDistributionandNitrogenRemovalEffectinWetlandswithDifferentStructuresHUANGJuan1,WANGShi-he1,ZHONGQiu-shuang2,YANLu1(1.Dept.ofMunicipalEngineering,SoutheastUniversity,Nanjing210096,P.R.China;2.Technologydevelopmentcenterofreconstructiondepartment,Jiangsuprovince,Nanjing210013,P.R.China)Abstract:Thedissolvedoxygendistributionandnitrogenremovaleffectindifferentstructuresofwetlandswereinvestigatedbytwogroupsofcomparisonexperiments(verticalflowwithhorizontalflow;single-stagewiththree-stagehorizontalflow).Itwasfoundthatthedifferenthydraulicflowpatternsindifferentstructuresofwetlandswouldresultindifferentoxygendistributionandnitrogenremovaleffect.Thespecialstructuredesignandhydraulicflowpatternofverticalflowwetlandwerefavorabletoitsdissolvedoxygendistribution,whichcouldincrease0.17mg/Linlocalareathanthatinhorizontalflowwetland.Thenitrogenremovaleffectofverticalflowwetlandwasbetterthanthatofhorizontalflowwetlandinthesameoperationconditions.TheremovalefficiencyofNH+4-NandTNcouldincrease9%and5%respectivelyinverticalflowwetlandthanthatinhorizontalflowwetland.Becauseofreaerationincontactingchannelsofthree-stagewetland,theremovalefficiencyofNH+4-NandTNreached66%and71%respectively,whichimproved8%and5%respectivelythanthatofsingle-stagewetland.Inaddition,three-stagewetlandcouldkeephighernitrogenremovaleffecteveninlowoperationwaterlevel,andtherangeofitsbesthydraulicretentiontime(HRT)wasextended.Keywords:structure;dissolvedoxygen;constructedwetland;nitrogenremovaleffect(subsurface-flowconstructedwetlands,SFCWs),,[1-3],,,[4-5],,[6],[7-9],,,,,,,[10],[11],,,11.10.2m(40~60mm),0.3m(20~40mm),0.15m(10~30mm),0.2m,(Phragmitescommunistrin.)20037200612,9:00-11:00,2d1,1.1.1垂直流与水平流人工湿地1223m1m0.85m,2(20cm)(45cm)(70cm)(0.5m1.0m1.5m2.0m2.5m)15,,0.65~0.70m,25~35cm/d121.1.2单段式和三段式水平流湿地,13.3m3.4m0.85m2005610(1~10d)(4060cm),(2004610)33ABC,0.3m,,10.5m,20.35m,,,20cm,AB,7(),S0,S1S3S52m6.5m11m,S2S42,S6,,,,,118土木建筑与环境工程第31卷1.2,11/(mgL-1)DOCODCrNH+4-NNO3--NTN0.2~1.2120~30030~650~1045~80(4)22.122/m/(mgL-1)/(mgL-1)0.50.560.500.420.600.540.451.00.410.310.190.430.380.201.50.420.280.130.450.350.302.00.510.320.100.580.400.172.50.430.230.050.470.290.252,20.84mg/L,,0.08mg/L,,,,,,2,,1.5m0.17mg/L,,,,,2.2,NH+4-NTN,444,,(NH+4-N:t=2.89,P=0.0150.05;TN:t=4.66,P=0.000690.05)NH+4-NTN,(68),6NH+4-N9%,TN5%,,,,,,,,[12],,,,,,,2.33:1,HRT5~7d,40cm60cm,5,60cm,0.4mg/L,0,119第6期黄娟,等:不同构型湿地氧分布及脱氮效果对比,,,S2S4,S30.5mg/L,,,,NH+4-N5DO40cm,60cm0.85m,,,,40cm,;,20~40cm,40cm60cm,,2.440cm60cm,NH+4-NTNHRT66,,(60cm,NH+4-N:t=4.49,P=0.00150.05;TN:t=3.77,P=0.00440.0540cm,NH+4-N:t=4.22,P=0.00230.05;TN:t=5.64,P=0.000320.05),NH+4-N,NH+4-N,,,,NH+4-NHRT6~8d,NH+4-N65%,8%NH+4-N,NH+4-NTN,,,TNHRT7d71%,TN5%6240cm,NH+4-NTN58%65%,9%13%,,,;,,AB,,,,HRT5~6d,HRT,HRT4~9d,TN60%,HRT,,,,HRT,31),120土木建筑与环境工程第31卷,2),,,NH+4-N9%,TN5%3),,,NH+4-N66%,TN71%,8%5%4)HRT,(40cm),HRT4~9d,TN60%:[1]MATAMOROSV,PUIGAGUTJ,GARCIAJ,etal.Behaviorofselectedpriorityorganicpollutantsinhorizontalsubsurfaceflowconstructedwetlands:Apreliminaryscreening[J].Chemosphere,2007,69(9):1374-1380.[2]CHRISTINAV,REIMOA,KASPARN,etal.Dynamicsofphosphorus,nitrogenandcarbonremovalinahorizontalsubsurfaceflowconstructedwetland[J].ScienceoftheTotalEnvironment,2007,380:66-74.[3],,,.NP[J].,2008,29(11):3043-3048.YANGCHANG-MING,GUGUO-QUAN,LIJIAN-HUA,etal.ResidencetimedistributionsandspatialvariationofN,Pinthesubsurface-flowconstructedwetlandsforpurificationofeutrophicaquaculturewater[J].EnvironmentalScience,2008,29(11):3043-3048.[4],,,.[J].,2007,33(3):65-68.HUANGJUAN,WANGSHI-HE,YANLU,etal.Wastewaterpurificationwiththree-segementsubsurfacewetland[J].TechnologyofWaterTreatment,2007,33(3):65-68.[5],.[J].,2009,35(1):46-53.ZHUYU-HUI,TIANGUANG-MING.Experimentalstudyofhybridflowconstructedwetlandstreatingdomesticsewage[J].TechnologyofWaterTreatment,2009,35(1):46-53.[6],,.[J].,2009,25(3):62-66.DUXIAO-LI,XUZU-XIN,WANGSHENG.Analysisofnitrogenremovalroutesintwomodifiedverticalsubsurface-flowconstructedwetland[J].ChinaWater&Wastewater,2009,25(3):62-66.[7]VARIGAS,CHONGRAKP.Nitrogenmassbalanceandmicrobialanalysisofconstructedwetlandstreatingmunicipallandfillleachate[J].BioresourceTechnology,2007,98(3):565-570.[8]JEREMYF,DORINB,KELLYAR,etal.Nitrogenremovalfromdomesticwastewaterusingthemarshlandupwellingsystem[J].EcologicalEngineering,2006,27(1):22-36.[9]IWA.Constructedwetlandsforpollutioncontrol:processes,performance,designandoperation.Internationalwaterassociationsci