A 100 mL sample of water was placed in a 300 mL BOD bottle, and dilution water added to fill the bottle. The initial DO concentration was 8.37 mg/L. The DO reading after 5 days was 3.75 mg/L and after 9 days was 2.13 mg/L. Determine a. BODs b. BOD9 (BOD after 9 days incubation) c. the reaction constant, k, and d. BODu (a trial-and-error solution may be needed to determine k and BOD) [Hint: the typical range of values for k is 0.12-0.23 for treated sewage.] was
