GATE CE 2018 Set 1 — Question 62
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Environmental Engineering → Wastewater Treatment Processes → BOD Kinetics
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Question
The ultimate BOD () of a wastewater sample is estimated as 87% of COD. The COD of this wastewater is 300 mg/L. Considering first order BOD reaction rate constant k (use natural log) = 0.23 per day and temperature coefficient , the BOD value (in mg/L, up to one decimal place) after three days of incubation at for this wastewater will be ______
Correct answer
154 to 161
Solution
1.Calculate the ultimate BOD ():
2.Adjust the reaction rate constant () for temperature ():
Assuming the given is the standard rate constant at :3.Calculate the BOD after 3 days ():
Using the first-order reaction formula (base as specified by "natural log"):Rounding to one decimal place, the BOD value is approximately 160.2 mg/L.
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