Process Costs

The costliest item in the activated-sludge process is the artificial aeration device in the contactor. This equipment

Notes: *Primary clarification normally precedes the activated-sludge process; sludge handling, disposal, and chlorination are included in the total treatment facility.

tTreatment costs are in cents per 400 gal of wastewater.

= MLVSS concentration in the recycled sludge flow, mg/l = net growth rate of microorganisms, mg MLVSS/l-day

Under steady-state conditions, Equation 7.25(3) can be simplified to the following equations:

where:

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