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1、BIODEGRADABILITYANDCHANGEOFPHYSICALCHARACTERISTICSOFPARTICLESDURINGANAEROBICDIGESTIONOFDOMESTICSEWAGEAbstract:Atthehigh-rateanaerobictreatmentofdomesticsewage,bothbiologicalandphysicalprocessesplayanimportantrole.Therefore,theanaerobicbiodegradabilityofraw,paper-filteredandmembr
2、ane-filteredsewageandblackwaterhasbeeninvestigatedinbatchexperiments.Additionally,theeffectofanaerobicdigestiononphysicalcharacteristics,likeparticlesize,surfacetensionandzeta-potential,ofthepresentparticlesisstudied.Thebiodegradabilityofdomesticsewageandblackwaterat308Cisalmost
3、similar(71±74%).Moreover,ahighmethanogenesisofthecolloidalfractionindomesticsewage(86_3%)isachieved,showingthatthelowremovalofcolloidalparticlesincontinuoushigh-rateanaerobicreactorsisduetolowphysicalremovalratherthanbiodegradability.Thelowestbiodegradabilityisdemonstratedforthe
4、dissolvedfraction(62%).Theresultsshowthatafteranaerobicdigestiontheaverageradiusofparticleswithdiameter54.4and50.45mmincreasedfordomesticsewage,whileitdecreasedforblackwater.Partofthesurface-activecomponentsindomesticsewageisnotbiodegradedduringanaerobicbatchdigestion,asindicate
5、dbythedevelopmentofthesurfacetension.Thenegativezeta-potentialofallparticleshardlychangesduringdigestion,showingthatcolloidalinteractionswerenotaffectedbyanaerobicdigestion.Keywords:anaerobictreatment,domesticsewage,blackwater,biodegradability,particlesize,surfactants,zeta-poten
6、tialINTRODUCTIONSeveralauthorshaveshownthatparticlesrepresentthemajorpart,upto85%,ofthetotalCOD(CODt)indomesticsewage(Levineetal.,1985;Zeemanetal.,1997).Theseparationofparticulateanddissolvedcompoundsindomesticsewageisusuallymadebyfiltrationthroughamembranefilterwithaporediamete
7、rofapproximately0.45mm(NielsenandHarremoes,1995).Theparticlesareoftenseparatedinasuspendedandacolloidalpart,withaparticlesizeofrespectivelylargerthan4.4mmandbetween0.45and54.4mm,althoughthesizerangeforcolloidalparticlesisnotinagreementwiththedefinitionasusedincolloidchemistry.At
8、treatmentunderanaerobicconditions,colloidalCOD(
