农村生活污水处理模式的选择分析_英文_万玉山

AnalysisonSelectionofDomesticSewageTreat-mentMethodinRuralAreaWANYu-shan＊,ZHANGPing,LIDing-long,MAJian-fengCollegeofEnvironmentandSafetyEngineering,ChangzhouUniversity,Changzhou213164AbstractBasedonthecharacteristicsofthedomesticsewageinruraldistrict,foursewagetreatmentmethodswereanalyzed.Theresultsfoundthattheoptimummethodwastoprocessthedomesticsewageonthespot,anditshouldbepopularizedandappliedinruralarea.KeywordsRuraldomesticwastewater;Pollution;TreatmentmethodReceived:February24,2011Accepted:March18,2011SupportedbytheNationalEleventhFive-yearWaterMajorProject(2008ZX07101-007-01);SoftScienceResearchProjectofJiangsuProvince(BR2009003).＊Correspondingauthor.E-mail:wanyushan@126.comCurrently,theproblemsofruraldomesticsewagetreat-mentareincreasinglysevere.Itisimminenttocollectandtreatruralsewagesoastoeffectivelycontrolthediffusedpol-lutionandrestraintheeutrophicationofwaterenvironment[1].Comparedwithurbansewage,ruraldomesticsewagehasfollowingcharacteristics:①itiswidelydistributedanddispersed;②itisintermittentlydischargedandgreatlyfluctu-ated,itsdailyvariationcoefficientisgenerallybetween3.0-5.0,andtheemissionofruraldomesticsewageisrelativelyconcentratedinmorning,noonanddusk[2];③thewaterqualityofruraldomesticsewageisrelativelystable.Thecon-tentsoforganicmatterandnitrogen,phosphorusandothernutrientsarehigher;thesewagealsocontainssyntheticdeter-gents,bacteria,viruses,parasiteeggs,etc.,itgenerallydoesnotcontaintoxicsubstances.Basedonoperationoftheexistingruralsewagetreatmentfacilities,theruraldomesticsewagetreatmentscouldbeclas-sifiedintofourmodelsaccordingtoscale,namely:①central-izedprocessingmodel:thedispersedsewagedischargedbydozensorhundredsofhouseholdsiscollectedandtransportedviathepipenetworkornaturalditchestoacentralizedtreat-mentsystem;②decentralizedprocessingonthespot;③combinationofcentralizedanddecentralizedprocessingmeth-ods;④thefourthmethodistotreatthesewagebyanyoneofabovethreemethods,andthenreusethetreatedwastewater.Inpresentstudy,foursewagetreatmentmethodswer