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512Vol．5No．12201112ChineseJournalofEnvironmentalEngineeringDec．201112311．3500022．3500023．100029RTD。。15L/h620mm/d。X703A1673-9108201112-2749-06StudiesonhydrauliccharacteristicsofverticalflowconstructedwetlandFanLiwei1LuZexiang2HaiReti3TengHang11．CollegeofEnvironmentalandResourceSciencesFujianAgricultureandForestryUniversityFuzhou350002China2．CollegeofMaterialEngineeringFujianAgricultureandForestryUniversityFuzhou350002China3．CenterofEnvironmentalScienceandTechnologyBeijingUniversityofChemicalTechnologyBeijing100029ChinaAbstractBasedontheresidenttimedistributionRDToftheverticalflowconstructedwetlandobtainedfromthetracerexperimentaqualitativeandquantitativeanalysisaboutthehydrauliccharacteristicsoftheverti-calflowconstructedwetlandwasmade．Theresultsindicatedthattheflowpatternwasnonidealandnonuniformandthereexisteddeadspaceanddiffuseofflowintheverticalflowconstructedwetland．Amassofdeadspaceinthewetlandsystemwasrelatedtothenonuniformityofwaterdistributionanditmaybethemainreasonresultedinthatthedeadspaceintheverticalflowconstructedwetlandwasbiggerthaninthesurfaceflowconstructedwet-land．TheexperimentalsoexpressedthattheinletflowhadgreateffectonRDTintheverticalflowconstructedwetland．Althoughthemeanresidenttimedecreasedwiththeincreaseoftheinletflowthenormalizedresidenttimeandtherateofthedeadspaceincreasedanddecreasedrespectively．Whentheinletflowwas15L/hthehydraulicloadwasin620mm/dtheflowpatternintheverticalflowconstructedwetlandwasclosetothestirred-flowduetoamassofdispersion．Itwasunfavorabletothedegradationofthepollutants．Keywordsverticalflowconstructedwetlandresidenttimedistributionhydrauliccharacteristics2009J050182010－06－232010－10－181980～。E-maifanlw@163．com、1-4。5-7。8-13。14。RTD。511．1PVC1.0m0.5m0.8m。500mm1。20mm20～40mm10～20mm。340mm140mm。1Fig．1Structureoffillerpackedinconstructedwetland2。20mm50mm5mm。“”40mm200mm42。2。5。2Fig．2Distributionandcollectionsystemofconstructedwetland1．2KCl。10～30min。22．11516。324cmF。3h=24cmFig．3WithdifferentinletflowhydraulicloadtheRTDintheverticalflowconstructedwetlandtheheightofoutletat24cm3。。2．2tn、。11718。tn=nVQ1nVm3Qm3/d。291019。tt2。σ2t057212。、3。t=∑∞0tCtΔt∑∞0CtΔt2σ2t=∑∞0t2CtΔt∑∞0CtΔt－t23CtmS·cmtminΔtmin。45tσ2ttθσ2θ2021。2。tθ=ttn4σ2θ=σ2tt25n0.320V0.25m3。24cm1。1Table1TheoryresidenttimeandstatisticvalueofRTDintheverticalflowconstructedwithdifferentinletflowhydraulicloadQL/hFmm/dtnmintmintθσ2θ5206960261．8470．2730．31115620320182．6130．5710．419251034192124．4480．6480．3281tθ124cm、ttn27.3%～64.8%tθ0.273～0.648。。40%～80%22。5L/hF=206mm/dtθ27.3%。1tθ。25L/hF=1034mm/d64.8%。。42tθ。tθ。。223。2。25L/hF=206mm/d25L/hF=1034mm/d58.18L28.15L73%35%。10。157252Table2VolumeandrateofthedeadspaceunderdifferentinletflowshydraulicloadinverticalflowconstructedwetlandQL/hFmm/dtminVLVL%5206261．84721．8258．187315620182．61345．6534．3543251034124．44851．8528．153545%～65%102315%～25%0.551023-48%～72%10。。。。3σθ2。σ2θ=0σ2θ=1。10＜σθ2＜1。15L/hF=206mm/dσθ215L/hF=620mm/dσθ2。101924。。5L/h206mm/d15L/h620mm/d。41σθ2。。。125L/hF=206mm/d58.15Lσ2θ0．31115L/hF=620mm/d34.35Lσ2θ0.419。“2”“2”“2”“2”2。。。。916。。2572129。1200mm/d800mm/d0．10．29。。200mm/d400、500800mm/d0．23、0．20、0．080．1716。500、8001200mm/d。。31。2。3。15L/h620mm/d。1KivaisiA．K．ThepotentialforconstructedwetlandsforwastewatertreatmentandreuseindevelopingcountriesAreview．EcologicalEngineering2001164545-5602VymazalJ．Theuseofsub-surfaceconstructedwetlandsforwastewatertreatmentintheCzechRepublic10yearsex-perience．EcologicalEngineering2002185633-6463SiracusaG．LaRosaA．D．Designofaconstructedwet-landforwastewatertreatmentinaSiciliantownandenvi-ronmentalevaluationusingtheemergyanalysis．EcologicalModeling20061973-4490-4974．—．19995．．200122545-49WuZhenbinRenMingxunFuGuipingetal．Theinflu-enceofhydrauliccharacteristicsonwastewaterpurifyingef-ficiencyinverticalflowconstructedwetlands．Environmen-talScience200122545-49inChinese6．．2003333359-362WangShiheWangWeiYuYan．Influenceofhydraulicconditionontreatmenteffectofconstructedwetland．Jour-nalofSoutheastUniversity2003333359-362inChi-nese7．．1997650-528．．1991458-12HuKangping．Hydraulicfactorsinconstructedwetlandsdesign．ResearchofEnvironmentalScience1991458-12inChinese9．．2001216535-539FuGuipingWuZhenbinRenMingxunetal．Studiesonthereactionkineticsandwaterflowpatternoftheintegratedvertical-flowconstructedwetland．ChinaEnvironmentalScience2001216535-539inChinese10．．2001216720-725FuGuipingWuZhenbinRenMingxunetal．Studiesonthehydraulicpatternofthevertical-flowconstructedwetland．ActaScientiaeCircumstantiae2001216720-725inChinese11PerssonJ．Hydraulicefficiencyofconstructedwetlandsandponds．WaterScienceandTechnology1999403291-30012GarciaJ．VivarJ．AromirM．etal．Roleofhydraulicretentiontimeandgranularmedimuninmicrobialremovalintertiarytreatmentreedbeds．WaterResearch200337112645-265313LiweiFanRetiHaiWenxingWangetal．Applicationofcomputationalfluiddynamictomodelthehydraulicper-formanceofsubsurfaceflowwetlands．JournalofEnviron-mentalScience200820121415-142214．CFD．200758123024-3032FanLiweiHaiRetiLuZexiang．CFDstudyontheeffectofthecatchmentareaonthehydraulicperformanceofsubsur-faceflowconstructedwetland．JournalofChemicalI