GATE ES · 2026 · ES
Question 58: Point and non-point sources of wastewater
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Question 58
ESNAT2 marksNeeds review
A sewage treatment plant employing activated sludge process is operated under the following conditions:
Wastewater flow rate into the aeration tank = 0.150 m
/sSoluble BOD
in the influent = 84 mg/LSoluble BOD
in the effluent = 11 mg/LMean cell residence time = 5 days
Total yield co-efficient = 0.5 kg of MLVS/kg BOD
removedDecay rate of microorganism = 0.050/day
The net waste activated sludge produced in the plant is _____ kg of VSS/day (rounded off to two decimal places).
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2026ES
GATE ES 2026 · Paper 1
Environmental Science and Engineering · Original paper archive
- Section
- Environmental Science and Engineering
- Question type
- Numerical answer (NAT)
- Marks
- 2 marks
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