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1、Applicationofmulti-soil-layersystem(MSL)inruralwastewatertreatmentAbstract:withthecontinuousimprovementoflivinginruralfarmers,thewaterconsumptionofresidentsisincreasing,ruralsewageemissionswillcontinuetoincrease,ifnottreateffectively,thewaterenvironmentinruralareaswillbeseriousdeteriorated,andinflu
2、encethelifequalityofruralresidents.Inthiscasethispaperpresentsadecentralizedsewagetreatmentsystem,multi-soil-layersystemtechnology(MSL)applicationintheruralsewagetreatment,thispapersummarizesthenewtechnology,youcanbetterunderstandandpractice,especiallyinthedevelopingcountrieswhereisinneedofthistech
3、nology.Intheforeseeablefuture,itcanprotectpublichealthandthesustainabledevelopmentoftheenvironment,anditalsoprovidesanewwayforruralsewagetreatment.Keywords:ruralsewage;multi-soil-layeringsystem;distributed1.IntroductionInrecentyears,withthecontinuousdevelopmentofeconomy,people'slivingstandardsconti
4、nuetoimprove,ruraleconomicdevelopmentisalsoveryrapid,buttheruraleconomicdevelopmentandenvironmentaldevelopmentisnotsynchronized,seriousruralwaterpollution.Whilehightechnicalsewagetreatmentplants,suchascentralizedsewagetreatmentplantsareinvolvedinlargeinvestmentcosts,highoperatingcosts,Becauseofecon
5、omicconstraints,suchsystemsarelesssuitableforlivestockfarmsandsmallcommunitiesinruralareas.Whilethemulti-media-soillayersystem(MSL)sewagetreatmentsystem,thisdecentralizedsewagetreatmentsystem,ithaslessinvestment,lowoperatingcosts,highhandlingload.Besides,theutilitymodelovercomesthedefectsoftheprior
6、soilpercolationwhichiseasytobeblockedfromthespacestructure.ThesewagetreatmentsystemisonekindofthepurificationtechnologyofseweragetreatmentsoildevelopedinJapanintwentiethCentury,thesoilsystemwillbemodularized,andthemoduleissetuparoundthewaterinthesoillayertoavoidclogging,andaddingnaturalorganicmater
7、ialstosoilmodulescanimprovethepurificationabilityofthesystem.TheMSLsystemconsistsofaPermeablelayer(PL)andasoilmixinglayerblock(SMB),ThePermeablelayerisusuallycomposedoflargerparticlesfillerssuchasgravel,pum
