4 10 ml of river water sample is added to a standard BOD bot

4) 10 ml of river water (sample) is added to a standard BOD bottle and the remainder of the bottle is flled with distilled water. The D0 initially in the bottle is 8.25mg/L and after 5 days the DO in the bottle is 3mg/L. What is the BODS in the original river water sample?

Solution

BOD5 = initial DO - DO after 5 days = 8.25-3 =5.25 mg/L

Therefore, the sample has a BOD5 of 5.25 mg/L