An activated sludge system (sketched below) is operating at equilibrium with the following information. Waste water related data: flow rate = 500 m3/hour, influent BOD = 150 mg/L, effluent BOD = 10 mg/L, Aeration tank related data: hydraulic retention time = 8 hours, mean - cell - residence time = 240 hours, volume = 4000 m3, mixed liquor suspended solids = 2000 mg/L.
The mass (in kg/day) of solids wasted from the system is
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