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!!,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,!!!,,,,,,,,,,,,,,EPs,,EPS,,,,,,,,,,,,,,,,DNA,,,,,,,EPs,,,,,,,,,,zeta,,,,EPS,,,,,10d),,,,,,,,10d),,,,,+,,,,,,,,,,,,,,,,,,,,,(,10d,,,10d),,,,20d),,,,,,,,,,,,,EPS,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,ESS,,,,,,,,,,,EsS,,,,,,,,,EPS,,,,,,,,,,,,,,,,,,,,1999,12(5):54,,,,2,24(6):4osto,,,,20(,23(3):252,AllenDG,Drop,Surface,2,35(2):339,JinB,1,TheInllueneeofKeyChe,2(XJ3,37(9):2127,Gane~ZykJJ,Facto,1993,65(3):258,PhysicalandChe,1993,27,2707,S,CabassudC,Comp,2(,40(12):2405,AetivatedSlud,1971,5(10):562,EekenfelderWW,RelationshipBetweenorganie,1984,18(l),91,KeinathTM,I,1979.13:1213,Shallghai,2StateKeyl,ChineseAeademyofscienees,Beijing,1(X,2,ChinaChina)ABSTRACTTheeharaeteristiesofsludgefloesformedinsequeneingbatehreaetorunderdifferentsolidsretentiontime(SRT),suehasehemieal(extracelluarpol,EPS),physieal(surfaeeeharge)andmo,fraetaldimension)parameters,wereeompared.TheresultsshowedthatSRThadlesseffeetontheeontentandeomPonentofEPS.ZetaPotentialvalueinereasedwiththeratioofpolysaceh,themeanllocsizedeereasedwithSRT.andthefloesizedistributionathigherSRThadamuehmoreuniformdistribution,aseomParedtolowerSRT.FloesexaminedbySEMatdifferentSRTsshoweddiversityinmo,highSRTprodueedfiocswithsmoothsurfaeeanddensestrueture;ThefloesformedbydifferentSRTshadd,andtheninflueneedthesludgefloceulationandsettlingPerformanee.Keywords:fioc,extraeelluarpolymeriesubstanee,solidsretentiontime,fraetaldimension,sizedis-tribution