If the BOD5,30 of waste is 150 mg/L and the reaction rate

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If the BOD_5,30 of waste is 150 mg/L and the reaction rate constant (to the base 'e') at 20°C is 0.35/day, the ultimate BOD in mg/L is

1. 97.5
2. 181.5
3. 212.9
4. 230.2

Correct Option: B

L₅ = L₀ [1 - e^-k×t]
150 = L₀ [1 - e^{-0.35×5]
∴ L₀ = 181.5 mg/L}