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A 5 mL wastewater sample is placed in a standard 300 mL BOD bottle, and the bott

ID: 36333 • Letter: A

Question

A 5 mL wastewater sample is placed in a standard 300 mL BOD bottle, and the
bottle is filled with dilution water. The bottle had an initial dissolved-oxygen
concentration of 9 mg/L and a final dissolved-oxygen concentration of 3.5 mg/L.
A blank (a BOD bottle filled with dilution water) run in parallel showed no
change in dissolved oxygen over the 5-day incubation period. The BOD reaction
rate coefficient for the waste is 0.3 /day. Calculate the 5-day (y5) and ultimate (L0)
BOD of the wastewater.

Explanation / Answer

BOD5 = DO0

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