F-M Ratio - Activated Sludge

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  • 7/30/2019 F-M Ratio - Activated Sludge

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    FLORIDAWATERRESOURCESJOURNAL MARCH199921

    Equation3,is2500x8.34x0.25=5210lb.TheF/Mratioisthen992/5210=0.19,which

    isbelowthestandardrangeof0.25to0.50.Theprocesshastoomuchsludge(weightofmicro-organisms)underaerationforthefoodbeingprovided.TheoperatorshouldwastesludgetolowertheMLTSSinaeration.DeterminingOptimalMLTSSTheoptimalMLTSSisbasedontheratio-

    proportionformula,R1:R2::P1:P2,wheretheproductofthemeansisequaltotheproduct,or:

    (R1xP2)=(R2xP1) (Equation4)whereR1 =thedesiredF/Mratio

    =0.25fortheaboveexample.R2 =theMLTSScorrespondingto

    thedesiredF/Mratio,or1.0pounds for an F/M ratio of0.25.

    P2 =optimalMLTSSP1 =weightoffoodinaerationfrom

    Equation3,or992lb/day intheaboveexample.

    Therefore,fortheexampleplant:(0.25xP2)=(1.0x992)or,P2=(1.0x992)/0.25=3968lbsMLTSS.TheoptimalaerationMLTSSconcentration

    canbefoundbyrewritingEquation3as:ppm=(poundsperdayMLTSS)/(8.34xMG)ppm=(3968lb/day)/(8.34x0.25MG)=1900.Therefore,1900ppmisthemaximumcon-

    centrationofMLTSStoachieveaF/Mratioof0.25.

    AnumberofyearsagowhenIwasayoungbuckinthewaterandwastewaterindustry,Iwrotesomearticlesonactivatedsludgeopera-tionfortheOverflowMagazine.Iamnowanold-timer, but I still see a need for someemphasisonunderstandingactivatedsludgeprocessoperation.

    January WaterTreatment:Membranes.FSAWWAOfficers.

    FebruaryWaterDistribution.FWPCOAOfficers

    March WastewaterCollection.April AnnualConferenceIssue.Misc.technicalarticles.

    May WaterTreatmentJune FSAWWA&FWEAAwards.

    Miscellaneoustechnicalarticles.July Disinfection.

    August Conservation.

    September IndustrialWastewater/ResidualsManagement.

    October WaterResourcesManagement/FWPCOAAwards.FSAWWAConference.

    November Reuse.December WastewaterTreatment.FWEA

    Officers.

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