高效垂直流人工湿地在小区水处理中的应用英文林静

ApplicationofHigh-efficientVerticalFlowConstructedWetlandinTreatmentofDomesticSewageinResi-dentialCommunityLINJing,LUJian,LEIZhi-hong,PENGLi-xin,WANGYong-xiuShenzhenAcademyofEnvironmentalScience,Shenzhen,Guangdong518001,ChinaAbstract　Withtheincreaseofrequirementforecologicalfunctionofenvironment,forqualityofwaterenvironment,forsewagetreatmentcostandforcomprehensiveutilizationofwaterresources,itwasboundtointroduceanewtypeofecologicaltechnologyforpollutiontreatmentwhichwaslowincost,convenientinmanagementandstableinoperation.High-efficientverticalflowconstructedwetlanddevelopedbyShenzhenAcademyofEnvironmentalSciencewascharacterizedbygoodlandscapeeffectandhighefficiencyofpollutantsremoval,andithadbeenwidelyappliedinsewa-getreatmentandrecyclingandinlakewatercirculationpurification.AlotofpracticalresultsshowedthatthistechnologycouldachievehighremovalefficiencyofSS,COD,BOD5,NH4-NandTPandtheremovalratehadarrivedatmorethan80%whenhydraulicloadingwas0.33-0.50m/d.Effluentqualityhadmetthewaterqualitystandardforrecyclingofurbansewage.Keywords　Verticalflowconstructedwetland,Residentialcommunity,SewagetreatmentReceived:March22,2011　　Accepted:June1,2011E-mail:[e-mail]　　Highefficientverticalflowconstructedwetland(HEVF-CW),whichisdevelopedbyShenzhenAcademyofEnviron-mentalSciences,isahighefficientecologicaltechnologyforpollutiontreatment,withuniquestructure,flowpattern,smalloccupation,andlong-termoperation.Thistechnologyhassuchadvantagesasadvancedprocess,reliabletechnology,highef-ficiencyandenergysaving,easyoperation,lowinvestmentandrunningcost[1].Ithasbeenappliedinbeautificationofsur-roundingenvironmentbyselectingappropriateplantspecies.TherearetwoadvantagesastoapplicationsofHEVFCWinresidentialcommunity.Firstly,theeffluentcanbereusedforwateringthelawnirrigation,flushingandreplenishingforland-scapelake.Secondly,constructedwetlandcanimproveeco-logicallandscape.HEVFCWcanbeappliedincirculationandpurificationofartificiallakeinresidentialcommunity,soastoensurewaterquality.ShenzhenAcademyofEnvironmentalSciencehasassumedalmostahundredofdomesticsewageconstructedwetlandtreatmentandreuseprojectsinmorethan20citiesinChina.1　ProcessflowofwastewatertreatmentinresidentialcommunityOverthepast15years,ShenzhenAcademyofEnviron-mentalSciencehascarriedoutaseriesofstudiesonsizeofsubstrate,plantvarietiesandflowpattern.Thedataofthosestudieshaveformedasetofsystemparameters.Differenttreatmentsystemshavebeendevelopedfordifferentdrainagestandard[2].1.1　Domesticsewagetreatmentsystem　Treatmentsys-temofdomesticsewage(Fig.1)generallyconsistsoftwoparts:pre-treatmentsystemandconstructedwetlandsystem.Pre-treatmentsystemincludesthreeparts:hydrolysisacidifica-tionpool,contactoxidationtankandsedimentationtank.Asforhydrolysisacidificationpool,hydraulicretentiontime(HRT)is2-4h,andpaddingis2-3mhigh.Asforcontactoxidationtank,HRTis3-5h,paddingis2-3mhighandtheratioofairtowateris3∶1-8∶1.Asforsedimentationtank,thereactiontimeis0.5handsurfaceloadingis1.5m3/m2h.Inpre-treat-mentsystem,morethan60%ofpollutantscanberemoved,en-suringthesafetyofconstructedsystem.Thehydraulicloadingofconstructedwetlandis0.3-0.5m3/m2d.Butifitislessthan0.25m3/m2d,pre-treatmentsystemcanbesimplifiedorcan-celed.EffluentqualityofthesystemcanmeetreusecriteriainWaterQualityStandardforUrbanMiscellaneousWaterConsump-tion[3](GB/T18920-2002)orWaterQualityStandardforScenicEnvironmentUse[4](GB/T18921-2002)[4].1.2　Lakewatercirculationtreatmentsystem　Nopre-treat-mentsystemisneededinlakewatercirculationtreatmentsys-tem(Fig.2).Lakewaterisdirectlypumpedintoconstructedwetlandsystem,andistherebyre-circulatedduetonaturaldrop.Inaccordancewiththetotalamountofpollutantsinlakeandthedifferenceofecologicalstructureandself-purificationofconstructedlake,thecycleperiodoflakevariesfrom3to20d.ThelakewaterpurifiedbyconstructedwetlandsystemcanreachtheIII-IVcriteriaspecifiedintheEnvironmentalQualityStandardsforSurfaceWater[5](GB3838-2002).2　TypicalcasesOverthepast15years,HEVFCWhadbeenwidelyappliedincommunitywastewatertreatmentandlakewatercirculationpurificationinmorethan20citiesinChina.Editor:ChanZhenzhen　　Proofreader:JournalofLandscapeResearchWuXiaoyan　2011,3(6):64-67DOI:牨牥牨牰牱牳牭牤jissn牨牴牬牫牴牳牴x牪牥牨牨牥牰牥牨牳Fig.1　VFCWtreatmentsystemfordomesticsewageFig.2　VFCWtreatmentsystemforlakewatercirculation2.1　Typicaldesignparameters　MajordesignparametersofHEVFCWsystembeingappliedintypicalprojectsareshowedinTable1.2.2　Treatmenteffect2.2.1　Treatmenteffectofdomesticsewage2.2.1.1　DomesticsewagetreatmentsysteminMeishanCourt.Toachievethegoalofenvironmentalprotectionanden-ergyconservation,aconstructedwetlandwasbuiltfortreat-mentandreuseofdomesticsewage.Theeffluentcouldbere-usedforgreeningwater.Thetreatmentscaleis50m3/d[6].ResultsrevealedthatremovalratesofBOD5,NH4-N,SSandLASwereallmorethan90%;theeffluentqualitywasuptore-usecriteria(Table2).Table1　MajordesignparametersofHEVFCWsystemsappliedinChinaItemsRunningtimeDesignedwatercapacitym3/dInfluentcategoryPretreatmentAreaofCWm2Hydraulicloadingm/dHydraulicretentiontime//hPackingsize//mmPlantsEffluen