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1、waterresearch46(2012)3897e3902Availableonlineatwww.sciencedirect.comjournalhomepage:www.elsevier.com/locate/watresTemperatureandsalteffectsonsettlingvelocityingranularsludgetechnologyaa,baaM.-K.H.Winkler,J.P.Bassin,R.Kleerebezem,R.G.J.M.vanderLans,a,M.C.M.vanLoosdrecht*aDepartmentofBio
2、technology,DelftUniversityofTechnology,Julianalaan672628BCDelft,TheNetherlandsbFederalUniversityofRiodeJaneiro,ChemicalEngineeringProgram,RiodeJaneiro,BrazilarticleinfoabstractArticlehistory:Settlingvelocityisacrucialparameteringranularsludgetechnology.InthisstudytheReceived3January201
3、2effectsoftemperatureandsaltconcentrationsonsettlingvelocitiesofgranularsludgeReceivedinrevisedformparticleswereevaluated.Atwo-foldslowersettlingvelocityforthesamegranuleswhere28March2012observedwhenthetemperatureofwaterdecreasesfrom40Cto5C.SettlingvelocitiesAccepted22April2012alsode
4、creasedwithincreasingsaltconcentrations.ExperimentsshowedthatwhenAvailableonline4May2012granuleswerenotpre-incubatedinasolutionwithincreasedsaltconcentration,theyinitiallyfloated.ThetimedependentincreaseinmassandhenceinsettlingspeedofKeywords:agranuleduetosaltdiffusionintothegranulewasd
5、ependentonthegranulediameter.GranularsludgeThetimeneededforfullsaltequilibriumwiththebulkliquidtook1minforsmallparticlesSettlingvelocityfromthetopofthesludgebedandupto30minforbiggranulesfromthebottomoftheSaltsludgebed.TheseresultssuggestthattemperatureandsaltconcentrationareimportantTe
6、mperatureparameterstoconsiderinthedesign,start-upandoperationofgranularsludgereactorsandmonitoringoftheseparameterswillaidinabettercontrolofthesludgemanagementinanaerobicandaerobicgranularsludgetechnology.Theobservationsalsogiveanexplanationforpreviousreportswhichweresuggestingthatasta
7、rt-upofgranularsludgereactorsismoredifficultatlowtemperatures.ª2012ElsevierLtd.Allrightsreserved.1.Introductiongranularsludgebedtechnology(EGSB)(Beunetal.,1999;LettingaandHulshoffPol,1991;Morgenrothetal.,1997;InactivatedsludgewastewatertreatmentprocessestheRinzemaetal.,1993).Oneofthem
