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GATE CE 2026 Set 1 — Question 63

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NAT+2 / -0HardASP Design (F/M, MLSS, SVI)Wastewater Treatment ProcessesEnvironmental Engineering

Environmental Engineering → Wastewater Treatment Processes → ASP Design (F/M, MLSS, SVI)

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An Activated Sludge Process (ASP) has an inlet wastewater flowrate of 20000 m3/day20000\text{ m}^3/\text{day} with a Biochemical Oxygen Demand (BOD) concentration of 250 mg/l250\text{ mg/l}. It produces treated wastewater containing 20 mg/l20\text{ mg/l} BOD. The aeration tank has a working volume of 6000 m36000\text{ m}^3 and a biomass concentration of 3000 mg/l3000\text{ mg/l}. Biological Sludge Residence Time (BSRT) of the system is 6 days6\text{ days}. The influent wastewater and the treated effluent from the system have negligible concentrations of biomass. The sludge recycle line from the bottom of the Secondary Sedimentation Tank (SST) to the inlet of the aeration tank has a flowrate of 6000 m3/day6000\text{ m}^3/\text{day}.
To maintain equilibrium, the flowrate (in m3/day\text{m}^3/\text{day}) of sludge that is to be wasted from the system is ______ (in integer).
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