693Civil EngineeringMedium
In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be________?
A400 ppm
B100 ppm
C200 ppm
D300 ppm
Correct answer
C. 200 ppm
Explanation
The correct answer is 200 ppm.