Question

Limit of BOD prescribed by the CPCB for the discharge of waste water into natural waters is

• A. < 30 ppm
• B. < 3 ppm
• C. < 10 ppm
• D. < 100 ppm

Answer 1

The correct option is C < 10 ppm

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.