Question

BOD is

• A. Directly proportional to the amount of organic waste.
• B. Directly proportional to the amount of DO.
• C. Inversely proportional to the amount of DO.
• D. Both (A) and (C)

Answer 1

Answer: (D)

Biochemical Oxygen Demand (BOD) is the amount of oxygen required to destroy the organic waste by the bacteria. The more oxygen required for bacteria that means there is more organic waste. For pure drinking water it is decided less than 1 ppm and for industrial & municipal waste it is less than 10 ppm. More the amount of BOD of water lesser will be its DO.