Question

Limit of BOD prescribed by central pollution control board for the discharge of industrial and municipal wastewaters into natural surface waters, is

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

Answer 1

The correct option is D $<10ppm$

Biological oxygen demand is a very important factor to determine the pollution level in the water, More BOD indicates more pollution and hence there is a certain limit prescribed by the central pollution control board so that water with a higher level of pollution is not released in natural water bodies.
The Limit of BOD prescribed by the central pollution control board is less than 10 parts per million (ppm).
The limit of BOD is < 10 ppm for water to be released in natural water bodies because a BOD level greater than 10 ppm indicates relatively higher pollution which if released to the natural water surface will pollute natural water bodies as well. Therefore, this is the correct option.
So, the correct answer is Option B.