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Environmental Issues

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  1. Limit of BOD prescribed by Central Pollution Control Board for the discharge of industrial and municipal waste waters into natural surface waters, is
    1. < 10 ppm
    2. < 100 ppm
    3. < 30 ppm
    4. < 3.0 ppm
Correct Option: A

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. In Yamuna water in Delhi it is about 1000 ppm.


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