Nitrification-efficiency-and-nitrifying-bacteria-abundance-in-combined-AS-RBC-and-A2O-systems

Nitrification-efficiency-and-nitrifying-bacteria-abundance-in-combined-AS-RBC-and-A2O-systemsWaterResearch37(2003)2281–2290NitrificationefficiencyandnitrifyingbacteriaabundanceincombinedAS-RBCandA2OsystemsS.J.Youa,C.L.Hsub,S.H.Chuangc,C.F.Ouyanga,*aGraduatedInstituteofEnvironmentalEngineering,NationalCentralUniversity,Chungli320,TaiwanbDepartmentofSafety,HealthandEnvironmentalEngineering,NationalLien-HoInstituteofTechnology,Miao-Li360,TaiwancDepartmentofEnvironmentalManagement,ChaoyangUniversityofTechnology,Taichung413,TaiwanReceived28November2001;receivedinrevisedform8July2002;accepted7December2002AbstractThisstudymakesacomparisonbetweenthenitrificationperformanceofTNCU-I(acombinedactivatedsludge-rotatingbiologicalcontactorprocess)andA2Osystemsbytheuseofapilotplantandbatchexperiments.Thenitrifierabundanceinbothsystemswasdetermined,usingcloning-denaturinggradientgelelectrophoresis(DGGE)andfluorescentin-situhybridization(FISH),toinvestigatetheroleofrotatingbiologicalcontactorintheTNCU-I