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GATE CE 2014 Set 2 — Question 59

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MCQ+2 / -0.67MediumBOD KineticsWastewater Treatment ProcessesEnvironmental EngineeringDO, BOD & CODWater Quality

Environmental Engineering → Wastewater Treatment Processes → BOD Kinetics

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Question

A waste water stream (flow = 2 m3/s2\text{ m}^3/\text{s}, ultimate BOD = 90 mg/l90\text{ mg/l}) is joining a small river (flow = 12 m3/s12\text{ m}^3/\text{s}, ultimate BOD = 5 mg/l5\text{ mg/l}). Both water streams get mixed up instantaneously. Cross-sectional area of the river is 50 m250\text{ m}^2. Assuming the de-oxygenation rate constant, k′=0.25/dayk' = 0.25/\text{day}, the BOD (in mg/l) of the river water, 10 km10\text{ km} downstream of the mixing point is
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