Understanding The Importance Of Aerobic Mixing, Bi

Understanding The Importance Of Aerobic Mixing, Biofilm Thickness ControUNDERSTANDINGTHEIMPORTANCEOFAEROBICMIXING,BIOFILMTHICKNESSCONTROLANDMODELINGONTHESUCCESSORFAILUREOFIFASSYSTEMSFORBIOLOGICALNUTRIENTREMOVALDipankarSen*,CliffordW.Randall**,WilliamBrink***,GregFarren****,DickPehrson*****,WayneFlournoy*****,RhodesR.Copithorn****SantaClaraValleyWaterDistrict5750AlmadenExpressway,SanJose,CA95118,USA**DepartmentofCivilEngineering,VirginiaTech,Blacksburg,VA***Stearns&Wheler,Cazenovia,NY****AnneArundelCountyDPW,MD*****EntexInc,Raleigh,NCABSTRACTResearchwasconductedinIFASsystemstoidentifyproblemsthatarosewiththebiofilmwhentheintensityofmixingandaerationfallbeloworriseabovecertainthresholds.ThetypesofIFASmediaevaluatedincludefixedbedcordmedia(RinglaceandBioweb),movingbedsponge(spongemedia–LinporandCaptor;andplasticmedia–Kaldnes)andRBCmedia.Anaerationprocessdesignmodelandoperatingstrategieshavebeendevelopedtoaddresstheseproblems.ThispaperpresentstheIFASandMBBRdesignmethodologyandaerationproce