搜索
34EnvironmentalScience&Technology34720117Vol.34No.7Jul.2011、、、、、。、、、[1-5][6-8]。、[9-10]。[11]。。《》2010-05-112010-07-07BK2009106KYY090231973-13951792958。,.[J].,2011,34(7)46-49.MaFeiJiangLiXiongJie-yuetal.Changesofhydraulicsofconstructedwetlandsafterbackwashing[J].EnvironmentalScience&Technology,2011,34(7)46-49.121111.2130012.210098。。CODCOD8～10L/m2·s5~7min。X52Adoi10.3969/j.issn.1003-6504.2011.07.0131003-6504(2011)07-0046-04ChangesofHydraulicsofConstructedWetlandsafterBackwashingMAFei12JIANGLi1XIONGJie-yu1ZENGTing11.SchoolofChemistryandEnvironmentEngineeringJiangsuTeachersCollegeofTechnologyChangzhou213001China2.SchoolofWaterConservancyandHydropowerEngineeringHohaiUniversityNanjing210098ChinaAbstractThepurposeisthatusingbackwashingmethodtoresolvefiltermediacloggingproblemwhichisanintractablematterinconstructedwetlandsproject.Improvementoffiltrationinverticalflowconstructedwetlandsbyvariousbackwashingmethodswasanalyzed.Effectsofbackwashingonpollutantremovalaswellastheinfluenceoncharacteristicsofhydrodynamicsofwetlandswerestudied.Resultsindicatedthatbackwashingiseffectiveinresolvingcloggingintheverticalflowconstructedwetlands.RemovalrateofCODwouldbereducedincloggedconstructedwetlandsandthenincreasedafterbackwashingduetotheincreaseofactualhydraulicretentiontime.Air-waterbackwashingisthebestmethodtoimproveconstructedwetlandsperformancewithtechnicalparametersasbackwashingstrength8~10L/m2·sandbackingwashingtime5~7min.Keywordsverticalflowconstructedwetlandswetlandscloggingbackwashingcharacteristicsofhydrodynamicshydraulicretentiontime7。BrixPaul[12-13][14]。。[15]。。。11.1、、、、。30cm、120cm100cm。3。。。1。1.220081082009620。20096212009107。20091081#~3#20091220。1d46h10L。。、20081020091220COD。、、3。1。、。1.31。[16]IGL81%。-500nm-。2。。22.1、、312。4.8h7.9h。。21Table1WorkconditionsL/(m2·s)/min191#122152#838~103#5~74734、、6.8、6.0、5.5h。。、tth=nVQ×241tth-n-V-m3Q-m3/d。nnQn1Q。2.2。。、。k=ρgε3.7D2127.5(1-ε)μ2kεD。。62.6%28.9%2。。111106.5L/min8955303.05L/min140。2009621107SS。3。、。3。55310203.05L/min155.15L/min。220130106.2L/min6.3L/min。。2.3COD20081020091220COD4。420081020096COD2009621487COD7COD40%。SS、、。。COD40%61%COD40%72%COD75%。。。31。。2CODCOD。38~10L/m2·s、5~7min40%。[][1],.[J].,200124545-49.[2].[D].2006.[3]WernerTMKadlecRH.Wetlandresidencetimedistribu－tionmodelling[J].EcolEng,2000,1577-90.[4]DAscuntarRíosAFToroVélezMRPenaetal.Changesofflowpatternsinahorizontalsubsurfaceflowconstructedwetlandtreatingdomesticwastewaterintropicalregions[J].EcologicalEngineering,2009,35274-280.[5]KshirsagarSRPhadkeNSTipnisSS.Detentiontimestud－iesintricklingfilter[J].IndianJEnvironHealth,1972,14195-104.[6]USEPA.ConstructedWetlandsTreatmentofMunicipalWas-tewatersManual[R].EPA6252R2992010CincinnatiOf－ficeofResearchandDevelopment2000,12-28.[7].[J].2005282141-146.[8].[J].2004253144-149.[9],.[J].2008293627-631.[10].[D].2007.[11],.[J].200830779-83.[12]BrixHCooperPF.ConstructedWetlandsforWastewaterTreatmentinEurope[M].LeidenBackhuysPublisher1998:95-118.[13]CooperP.Areviewofthedesignandperformanceofverti－calflowandhybridreedbedtreatmentsystems[J].WatSciTech1999,4031-9.[14].[J].20084031555-1560.[15].[J].2009283410-414.[16].[J].199514411-15.49