资源描述：
《水污染控制工程12污泥处理与处置》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。
1、Chapter12treatmentanddisposalofsludgeSludgedisposalpurposeTreatmentofsludgeaccountsfor20%~50%,oreven70%oftotalconstructioncosts・Sludgefromsewagetreatmentplantsaccountfor0.3%to0.5%ofthewatertreatment・Sludgecontainsalargenumberofharmfultoxicsubstances,suchasparasiticwormeggs,pathogenicmi
2、croorganisms,bacteria,syntheticorganismsandheavymetalions;Usefulsubstancessuchasphytonutrients(nitrogen,phosphorus,potassium),organicmatterandwater・Sludgedisposalanddisposalforthefollowingpurposes:(1)tomakethesewagetreatmentplantfunctioningnormallyandensuretheeffectivenessofthesewagetr
3、eatment:(2)tomakethetoxicandhazardoussubstancesproperlydisposedorutilized;(3)tostabilizetheorganicmatterthatispronetodecayanddegenerate;(4)tomaketheusefulmaterialavailableinacomprehensiveway.Theclassification,natureandquantityofthesludge12.1.1classification1)itisdividedbycomposition:Th
4、esludgeorganicmaterialisthemaincomponent,thefirstsedimentandthesedimentofthesecondaryprecipitateareallsludge・Itispronetorot,finegrain,smallweight(about1.02、1.006),highwatercontentandnoteasytodehydrate,thegelatinousstructure・Theslagistheresidueoftheinorganicsubstance・Themainpropertiesof
5、thesedimentarethecoarserparticles,whicharelargerinproportion(around2),whicharelowinmoisturecontentandeasytobedehydratedandlessliquid・Thesedimentinthesinkandsomeindustrialwastewateristhesedimentofthesediment・2)itisdividedbysource:Thefirstprecipitatesludgecomesfromtheinitialsedimentation
6、basin.Theresidualactivatedsludgecomesfromthesecondarysedimentationbasinaftertheactivatedsludgeact・Thehumussludgecomesfromthesecondarysedimentationbasinafterthebiofilmmethod.(thesethreekindsofsludgecanbereferredtoassludgeorfreshsludge・)Afterthesludgeisdigestedbyanaerobicdigestionoraerob
7、icdigestion,itiscalleddigestionsludgeorcookedsludge・Chemicalsludgeorchemicalprecipitateafterchemicalsludgeistreatedwithchemicalprecipitation・Thenatureofthesludge1,sludgemoisturecontentThepercentageoftheweightofwaterinthesludgeandthetotalweightofthesludgeiscalledthesludgemoistureconte
