GATE CE 2026 Set 2 — Question 42
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Environmental Engineering → Wastewater Quantity & Sewerage → DO, BOD & COD
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Question
The ml of raw sewage is diluted to ml. The Dissolved Oxygen (DO) of the diluted sample at the beginning of Biochemical Oxygen Demand (BOD) test was mg/l and it was mg/l after 5-day incubation at .The (in mg/l) of the raw sewage is
Correct answer
(A) 200
Solution
Given:
Volume of raw sewage = ml
Volume of diluted sample = ml
Initial DO () = mg/l
Final DO () = mg/lDilution Factor () =
mg/l.Correct option is (A).
Volume of raw sewage = ml
Volume of diluted sample = ml
Initial DO () = mg/l
Final DO () = mg/lDilution Factor () =
mg/l.Correct option is (A).
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