Problem:
A 10 mL sample is added to a 300 mL BOD bottle. Unseeded dilution water is added to the sample bottle and the initial dissolved oxygen concentration is measured as 8.5 mg/L. After the sample is sealed, the laboratory incorrectly takes a measurement of DO reading on day 6 of 3 mg/L. if the BOD reaction rate coefficient for the sample is 0.30/d,
Required:
Question 1: Estimate what the BOD5 should have been.
Question 2: Estimate what the DO reading should have been on day 5.
Question 3: Determine the ultimate carbonaceous BOD of the sample.
Note: Show all workings.