KineticHalf-saturation Coefficient Considerations

KineticHalf-saturation Coefficient Considerations for Post Denitrification MBBRKinetic/Half-saturationCoefficientConsiderationsforPostDenitrificationMBBRMarijaPeric1*,BeverleyStinson1,DilliNeupane1,KathleenKharkar1,YaldaMokhayeri1,JohnCarr2,RoubenDerMinassian2,SudhirMurthy2,WalterBailey21AECOMWater,14504GreenviewDrive,Suite400,Laurel,MD,207082DCWASA,5000OverlookAvenueSW,WashingtonDC,20032*Towhomcorrespondenceshouldbeaddressed.Email:marija.peric@aecom.comABSTRACTTobetterunderstandtherobustnessofMBBRpostdenitrificationprocesstoachieveverylowlevelofNOx-N<1mg/L,pilotwasimplementedattheBluePlainsAWTP.Itwasimportanttounderstandthelimitationsofthesubstrate,expressedasKs(half-saturationcoefficient)ontheoveralldenitrificationrates.Totaloffour100-gallonanoxicpilotreactorswereusedforthistesting.SDNRwasestimatedbymeasuringtherateofconsumptionofNOx-Novertime.Atanambienttemperatureof17°C,Ks,NOx-N(Ksfornitratelimitedtest)was2.5mg/Lonaverage,andKs,bsCOD(KsforbsCODlimitedtest)was6.5mg/L.Ks,NOx-Nremaine