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1、waterresearch46(2012)425e432Availableonlineatwww.sciencedirect.comjournalhomepage:www.elsevier.com/locate/watresImprovementofactivatedsludgedewaterabilitybymildthermaltreatmentinCaCl2solutionBaohongGuan*,JieYu,HailuFu,MinhuiGuo,XinhuaXuDepartmentofEnvironmentalEngineering,ZhejiangUniversit
2、y,Hangzhou310058,ChinaarticleinfoabstractArticlehistory:Activatedsludgedewateringisofgreatimportanceinsludgetreatmentanddisposal.ToReceived9September2011enhancethedewaterability,anovelmethodwasperformedbytreatingthesludgeunderReceivedinrevisedformmildtemperature(50e90C)inCaClsolution(3.7e
3、1110.0mg/gdrysludge).Thecapillary22November2011suctiontime,zetapotential,Fourier-transformedinfraredspectra,concentrationofsolubleAccepted3November2011proteinandcarbohydrateswereemployedtocharacterizethedewaterabilityandinflu-Availableonline13November2011encingmechanism.Thesludgedewaterabil
4、itywasdeterioratedwithsinglethermaltreatment,butsignificantlypromotedinCaCl2solutionandadvancedfurthertogetherwithKeywords:thermaltreatment.AnincreasingCaCl2dosagereducedthesurfacechargeremarkably,2þActivatedsludgeandahighertemperaturecouldstrengthenthisimpact.ThespectraindicatethatCaDewate
5、rabilitycouldinteractwiththeprotein,phenolsandOeHfunctionalgroupintheflocs.TheMildthermaltreatmentthermaltreatmentcouldcausethesolubilizationofproteinandcarbohydrates,providing2þCaCl2morebindingsitesforCatoestablishastrongbridgingamongtheflocs.AsCaCl2dosageelevated,thesolublecarbohydratessho
6、wedareductiontrend,whilethesolubleproteinloweredfirstlyandthenbouncedbackexceptthatremainedunchangedatroomtemper-2þature.AbridgingequilibriumispresumedtoexistbetweenCaandthesolubleprotein.2þAndthebridgingbetweenCaandthesolublecarbohydratesplaysamoreimportantroleinthedewatering.Thesludgedewa
7、terabilitywassuccessfullyandeconomicallyimprovedbythermaltreatmentinCaCl2solution.ª2011ElsevierLtd.Allrightsreserved.1.Introductionmostsimple,efficientandcost-effectivetechnologiesforsludgedewatering.Itcausesthesolubilizationofflocs,Theactivatedsludgeprocessiswi
