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GATE CE 2017 Set 1 — Question 54

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NAT+2 / -0MediumBOD KineticsWastewater Treatment ProcessesEnvironmental Engineering

Environmental Engineering → Wastewater Treatment Processes → BOD Kinetics

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Question

Two wastewater streams A and B, having an identical ultimate BOD are getting mixed to form the stream C. The temperature of the stream A is 20∘C20^\circ\text{C} and the temperature of the stream C is 10∘C10^\circ\text{C}. It is given that
  • the 5-day BOD of the stream A measured at 20∘C=50 mg/l20^\circ\text{C} = 50\text{ mg/l}
  • BOD rate constant (base 10) at 20∘C=0.115 per day20^\circ\text{C} = 0.115\text{ per day}
  • temperature coefficient =1.135= 1.135
The 5-day BOD (in mg/l, up to one decimal place) of the stream C, calculated at 10∘C10^\circ\text{C}, is ___________
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