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1、BIODEGRADABILITYANDCHANGEOFPHYSICALCHARACTERISTICSOFPARTICLESDURINGANAEROBICDIGESTIONOFDOMESTICSEWAGEAbstract:Atthehigh-rateanaerobictreatmentofdomesticsewage,bothbiologicalandphysicalprocessesplayanimportantrole.Therefore,theanaerobicbiodegradabilityofraw,pap
2、er-filteredandmembrane-filteredsewageandblackwaterhasbeeninvestigatedinbatchexperiments.Additionally,theeffectofanaerobicdigestiononphysicalcharacteristics,likeparticlesize,surfacetensionandzeta-potential,ofthepresentparticlesisstudied.Thebiodegradabilityofdom
3、esticsewageandblackwaterat308Cisalmostsimilar(71±74%).Moreover,ahighmethanogenesisofthecolloidalfractionindomesticsewage(86_3%)isachieved,showingthatthelowremovalofcolloidalparticlesincontinuoushigh-rateanaerobicreactorsisduetolowphysicalremovalratherthanbiode
4、gradability.Thelowestbiodegradabilityisdemonstratedforthedissolvedfraction(62%).Theresultsshowthatafteranaerobicdigestiontheaverageradiusofparticleswithdiameter54.4and50.45mmincreasedfordomesticsewage,whileitdecreasedforblackwater.Partofthesurface-activecompon
5、entsindomesticsewageisnotbiodegradedduringanaerobicbatchdigestion,asindicatedbythedevelopmentofthesurfacetension.Thenegativezeta-potentialofallparticleshardlychangesduringdigestion,showingthatcolloidalinteractionswerenotaffectedbyanaerobicdigestion.Keywords:an
6、aerobictreatment,domesticsewage,blackwater,biodegradability,particlesize,surfactants,zeta-potentialINTRODUCTIONSeveralauthorshaveshownthatparticlesrepresentthemajorpart,upto85%,ofthetotalCOD(CODt)indomesticsewage(Levineetal.,1985;Zeemanetal.,1997).Theseparatio
7、nofparticulateanddissolvedcompoundsindomesticsewageisusuallymadebyfiltrationthroughamembranefilterwithaporediameterofapproximately0.45mm(NielsenandHarremoes,1995).Theparticlesareoftenseparatedinasuspendedandacolloidalpart,withaparticlesizeofrespectivelylargert
8、han4.4mmandbetween0.45and54.4mm,althoughthesizerangeforcolloidalparticlesisnotinagreementwiththedefinitionasusedincolloidchemistry.Attreatmentunderanaerobicconditions,colloidalCOD(
