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An industrial wastewater effluent is treated using a complete mix activated sludge process with a 2 secondary clarifiers following it. The effluent from the clarifiers contains 60 mg/L VSS (volatile suspended solids). The flow rate from the primary clarifiers is 60,000 m3/day and contains 100 mg/L VSS. The bioreactor (activated sludge tank) has a volume of 8,000 m3 and a biomass production rate of 0.5 kg/m3-d. The return VSS concentration is 12,000 mg/L. The specific gravity of the VSS is 1.0.
a) For a mixed liquor volatile suspended solids (MLVSS) of 1800 mg/L, what is the total return solids flow rate?
b) Assume the return solids flow rate is 5,000 m3/d and the MLVSS is 2200 mg/L; what is the wasted solids flow rate from each of the secondary clarifiers?
c) What solids must be wasted daily to maintain the MLVSS at constant concentration?
Determine the corresponding error in the computed discharge
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To provide knowledge and practice AutoCAD software package for engineering activities.
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