A wastewater sample has an initial BOD of 222 mg/L. The

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A wastewater sample has an initial BOD of 222 mg/L. The first order BOD decay coefficient is 0.4/day. The BOD consumed (in mg/L) in 5 days is

1. 150
2. 192
3. 30
4. 50

Correct Option: B

L₅ = L₀ [1 – e^–k×t]
= 222 [1 – e^–0.4×5] = 192 mg/L