Engineering Board Exam Reviewer · Environmental Engineering · hard

A wastewater has an ultimate BOD of 300 mg/L and a BOD rate constant of 0.23 per day (base e). What is its 5-day BOD?

1. 95.0 mg/L
2. 278.8 mg/L
3. 205.0 mg/L
4. 345.0 mg/L

Answer

C. 205.0 mg/L

Solution

BODt = L0(1 - e-kt) = 300(1 - e-1.15) = 205.0 mg/L.

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