GATE Civil Engineering
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An activated sludge system (sketched below) is operating at equilibrium with the following information. Wastewater related data: flow rate $=500 \: m^3/hour$, influent BOD $= 150 mg/L$, effluent BOD $=10 \: mg/L$. Aeration tank related data: hydraulic retention time $=9$ hours, mean-cell-residence time $=240 $ hours, volume $4000 \: m^3$, mixed liquor suspended solids $ = 2000 \: mg/L$

The mass (in kg/day) of solids wasted from the system is

  1. $24000$
  2. $1000$
  3. $800$
  4. $33$
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