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1、Desalination183(2005)417–424Performanceofanoxidationditchretrofittedwithamembranebioreactorduringthestart-upaaabM.Tiranuntakul,V.Jegatheesan*,P.A.Schneider,H.L.FracchiaaSchoolofEngineering,JamesCookUniversity,Townsville,Queensland4811,AustraliaTel.+61(7)47814871;Fa
2、x+61(7)47814270email:jega.jegatheesan@jcu.edu.aubCitiwater,TownsvilleCityCouncil,POBox1268,Garbutt,QLD4810,AustraliaReceived21February2005;accepted10March2005AbstractTheobjectiveofthisstudyistoelucidatethefull-scalecharacteristicsofanoxidationditch(OD)retrofitted3w
3、ithamembranebioreactor(MBR).Domesticwastewaterenteringanoxidationditchataflowrateof86m/dwasdirectedtoaMBRretrofittedintotheoriginalsecondarysedimentationtank.TheMBRcontainedflatsheetmembranes.Thedatacollectedfor2monthsduringthestart-upofthesystemshowedthatpHwasmain
4、tainedat7.2and6.7inODandMBR,respectively.Dissolvedoxygen(DO)inMBRremainedstableat7.8mg/L,whilefluctuatedinOD.Themixedliquorsuspendedsolids(MLSS)intheODremainedsteadyataconcentrationabout1000mg/L,butitwasgraduallybuildingupfrom500mg/Lto2400mg/LintheMBRduringthisperi
5、od.Measurementsofcarbohydrateandproteinweremadebyextractingtheextracellularpolymericsubstances(EPS)withsodiumhydroxide(NaOH)fromthemixedliquorobtainedfrombothODandMBR.CarbohydratewaspredominantintheEPSandtheratiosbetweencarbohydrateandproteinconvergedtofixedvaluesf
6、romthefourthweek;inthiscasetheratiowas4.5forODand5forMBR.ThevariationinEPScontentsshowedsimilartrendsinbothODandMBR.Theintegratedtreatmentfacilityremovedammonia,CODandBODat100,91.6and97.0%,respectively.However,efficiencyofnitrateandphosphateremovalhasnotbeenrealize
7、dyet.Keywords:Oxidationditch;Submergedflatsheetmembrane;Extracellulerpolymericsubstance;Nutrientremoval1.IntroductionsimilartowastewatertreatmentinasequentialAnoxidationditchisamodifiedactivatedbatchreactor.Buttheoxidationditchprovidessludgetreatmentprocessthatisco
8、mparativelyaerobicandanaerobictreatmentinthesamecircularbasin.Thefirstfullscaleplantof*Correspondingauthor.oxidationditchinstalledinVoorschoten,P
