The total flow at a wastewater-treatment plant is 1000 m³/day. The flow is split evenly and treated in two parallel complete mix biological aeration basins to remove BOD from the wastewater. They each have a volume of 100,000 L. (a) In hours, what is the hydraulic retention time in each tank? (b) If the influent BOD concentration is 150 mg/L and the zero-order decay coefficient is 60 mg/L-h, what is the steady state effluent concentration? (Hint: you need to derive the expression from the mass balance reaction for CMFR by replacing the first-order reaction term with zero order reaction) (

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Storm Sewers and Detention

The storm drains system transports rainwater or stormwater and other runoff from roads, parking lots, and roof downpipes directly to nearby creeks, rivers, or the sea without any treatment.