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GATE CE 2022 Set 2 — Question 60

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NAT+2 / -0MediumPrimary SedimentationWastewater Treatment ProcessesEnvironmental EngineeringSTP Design NumericalsEffluent & Sludge Management

Environmental Engineering → Effluent & Sludge Management → Primary Sedimentation

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Question

A sewage treatment plant receives sewage at a flow rate of 5000 m3/day5000\text{ m}^3/\text{day}. The total suspended solids (TSS) concentration in the sewage at the inlet of primary clarifier is 200 mg/L200\text{ mg/L}. After the primary treatment, the TSS concentration in sewage is reduced by 60%60\%. The sludge from the primary clarifier contains 2%2\% solids concentration. Subsequently, the sludge is subjected to gravity thickening process to achieve a solids concentration of 6%6\%. Assume that the density of sludge, before and after thickening, is 1000 kg/m31000\text{ kg/m}^3.
The daily volume of the thickened sludge (in m3/day\text{m}^3/\text{day}) will be_________. (round off to the nearest integer)
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