Question

Limit of BOD prescribed by Central Pollution Control Board for discharge of industrial and municipal waste waters into natural surface waters is

• A. $<3.0$ ppm
• B. $<10$ ppm
• C. $<30$ ppm
• D. $<100$ ppm

Answer 1

Answer: (B)

$<10$ ppm

BOD or Biochemical oxygen demand is the amount of oxygen required to decompose the organic matter in one litre of polluted water. More BOD means more organic matter is present in the water. Hence, a high BOD value means that the water is heavily polluted.

According to Central Pollution Control Board, limit of BOD for discharge of industrial and municipal waste waters into natural surface waters is less than 10 ppm i.e. < 10 ppm.

So, the correct answer is '< 10 ppm'