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

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Question:

A 5 mL wastewater sample is put 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 the parallel showed no change in the dissolved oxygen in the 5-day incubation period. The BOD reaction rate coefficient for the waste is 0.3/day. Calculate the 5-day (y5) and the ultimate BOD (Lo) of the wastewater.