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Completely Mixed Reactor

An oxidation-ditch activated-sludge system receives 17 500 m3/d ofmunicipal wastewater. The BOD of the wastewater is 210 mg/L and no primary treatment is provided. The oxidation-ditch is 3 m deep, 7 m wide and 400 m long. The reactor operated at 1800 mg/L MLSS and the biological constants Y= 0.5 kg/kg and kd = 0.05 d-1

Determine the mean cell-resident time for 90 percent BOD removal.


Environmental-Engineering   
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