The-Bioaugmentation-of-Sequencing-Batch-Reactor-Sludges-Forbiological-Phosphorus-Removal

8)PergamonWat.Sci.T~cIt.Vol.35.No.I.pp.19-26.t997.CopyrightC>1996IAWQ.PublishedbyElsevierScienceltdPrinledinOreatBritain.Allrighl'reserved.0273-1223/97S17'00+0-00PU:S0273-1223(96)OO874-8THEBIOAUGMENTATIONOFSEQUENCINGBATCHREACTORSLUDGESFORBIOLOGICALPHOSPHORUSREMOVALE.Belia*andP.G.Smith***DepartmentofCivilEngineering.UniversityofStrathclyde./07Rottenrow.GlasgowG4ONG.UK**DepartmentofCivilEngineering.UniversityofPaisley.PaisleyPAl28E.UKABSTRACT1lIedevelopmentofenhancedbiologicalphosphorusremoval(EBPR)throughthebioaugmentallonofaconventionalactivatedsludgewassJUdied.1lIeobjectivesofthestudyweretoevaluatethephosphorusremovalcapabilityofasequencingbatchreactor(SBR)whenstartedwithconventionalactivatedsludgeandaugmentedwilhapurecultureofAcin~tobactuIwoffii.1lIeefTectoftheadditionofthepurecultureonthereactorstartuptime.thesettlingpropertiesofthesludgeandonCODandnitrogenremovalwasalsoinvestigated.Theeffectoftheremovalofupto70%ofthebioaugmenJedbiomassanditssubstitutionwithunconditionedsludgefromaconventionalsewagetreatmentplantwasdetermined.ThisstudyhasdemonstratedthatbioaugmentationcanconvertaconventionalsewageworksactivatedsludgetoanEBPRsludgein14days.Thesludgeproducedshowsresiliencetoinfluentphosphatefluctuations,lowD.O.andbiomassreplacementTheCODandnitrogenremovalcapabilitiesofthesludgeanditssettlingpropertiesarenotaffectedbytheadditionofthepureculture.CopyrightC1996IAWQ.PublishedbyElsevierScienceLtdKEYWORDSAcinetobacterIwoffii;bioaugmentation;biologicalphosphorusremoval;SBR.startuptime.INTRODUCTIONTheuseofbioaugmentationfortheimprovementoftheoperationofactivatedsludgeplantshashadmixedsuccessandpublishedresultsonitseffectivenesshavebeenjudgedinconclusive(StephensonandStephenson.1992).Whensuccessfullyappliedthough.bioaugmentationhasbeenshowntoassistwithplantstartup(Stevens.1989;Wildereretal.•1991).organicandhydraulicoverloading(Stevens.1989;Kennedyetal..1990).removaloftoxiccompoundsorotherproblematicwastewatercomponents(Yingetal.•1986)andsludgesettleability(Chambers.1981).Sp