Organic Loading

The basic criterion of design is the organic loading. The organic loading or food to microorganism (F/M) ratio is the amount of biodegradable organic material available to an amount of microorganisms per unit of time. This ratio can be expressed more concisely as follows:

^^ (Organicconcentration)(Wastewaterflow)

(Microorganism concentration)(Contactor volume)

or where:

F/M = Organic loading, lb BOD5 per lb mixed-liquor

SS (MLSS) day BOD5 = Biological oxygen demand, mg/l MLSS = Mixed-liquor SS, mg/l V = Contactor volume, million gal Q = Wastewater flow, mgd

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