Combining anoxic denitrifying ability with aerobic

Combining anoxic denitrifying ability with aerobic-anoxicphosphorus-removal exInternationalBiodeterioration&Biodegradation57(2006)121–128Combininganoxicdenitrifyingabilitywithaerobic–anoxicphosphorus-removalexaminationstoscreendenitrifyingphosphorus-removingbacteriaHoi-PingShi,Chi-MeiLee�DepartmentofEnvironmentalEngineering,NationalChung-HsingUniversity,No.250,GuoguangRd.,NanChiu,Taichung,Taiwan402,ROC.Received3October2005;receivedinrevisedform2January2006;accepted6January2006AbstractAnaerobic–aerobic(oranaerobic–anoxic)enhancedbiologicalphosphorus-removal(EBPR)processesweregenerallyconsideredforPremoval.However,someisolatedpolyphosphate-accumulatingorganisms(PAOs)ordenitrifyingP-removalbacteria(DPB)mayhavevariedP-removalcharacteristicsunderdifferentconditions.ThisstudyinvestigatedproperscreeningproceduresforisolatingDPBfrompiggerysludge,enrichedsludge,andwinerysludge.Wecombinedanoxicdenitrifyingabilitywithaerobic–anoxicP-removalexaminationstoscreentheDPBsascomparedwithconventionalanae