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1、水污染控制工程12污泥处理与处置（Treatmentanddisposalof12sludgeinwaterpollutioncontrolproject）ThetwelfthchaptersludgetreatmentanddisposalSludgetreatmentpurposesSludgetreatmentaccountedfor20%to50%ofthetotalconstructioncost,oreven70%.Thesludgeproducedbythesewagetreatmentplantacco
2、untsforabout0.3%to0.5%ofthetreatedwater.Sludgecontainsalargenumberofharmfultoxicsubstances,suchasparasiticeggs,pathogenicmicroorganisms,bacteria,syntheticorganicmatterandheavymetalions,etc.,usefulsubstancessuchasplantnutrients(nitrogen,phosphorus,potassium),orga
3、nicmatterandwater,etc..Sludgetreatmentanddisposaltoachievethefollowingobjectives:(1)makethesewagetreatmentplantrunnormallyandensuretheeffectofsewagetreatment;(2)makepropertreatmentoruseoftoxicandharmfulsubstances;(3)maketheorganiccompoundseasytocorruptandsmellge
4、tstabletreatment;(4)makeusefulmaterialgetcomprehensiveutilization,changeharmintobenefit.12.1classification,propertyandproductionofsludge12.1.1classification1)dividedintodifferentpartsaccordingtothecomposition:Thesludgeorganicmatteristhemaincomponent,andtheprecip
5、itateintheprimarysedimentationtankandthetwosedimentationtankareallsludge.Easilyrotten,smelly,fineparticles,smallproportion(about1.02~1.006),highmoisturecontentandnoteasytodehydrate,gelatinousstructure.Sedimentiscalledsedimentwithinorganicsubstanceasmaincomponent
6、.Themainpropertiesofthesedimentarecoarseparticles,largeproportion(about2),lowmoisturecontent,easydehydration,poorliquidity.Sedimentofgritchamberandsedimentationtankofsomeindustrialwastewaterbelongstosediment.2)accordingtodifferentsources:Primarysettlingsludgecom
7、esfromprimarysettlingtank.Residualactivatedsludgecomesfromthetwosedimentationtankafteractivatedsludgeprocess.Thetwosettlingtankofhumicsludgefrombiofilmprocess.(above3kindsofsludgecanbecollectivelyreferredtoasrawsludgeorfreshsludge)Thedigestedsludgeistreatedbyana
8、erobicdigestionoraerobicdigestion,whichiscalleddigestedsludgeormaturesludge.Chemicalsludgetreatmentofwastewaterbychemicalprecipitation,thesedimentiscalledchemicalslud
