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प्रश्न
What do you mean by Biochemical Oxygen Demand (BOD)?
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उत्तर
Biochemical oxygen demand is the amount of oxygen required by bacteria to decompose organic matter in a certain volume of sample of water. Clean water would have a BOD value of less than 5 ppm, whereas highly polluted water has a BOD value of 17 ppm or more.
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संबंधित प्रश्न
Give an account of various sources and harmful effects of water pollution.
Sewage is a liquid waste from ______.
State whether the following statement is true or false. If false, write the correct statement.
Chemical pollutants include a metallic salt solution of mercury and lead.
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Fill in the Blanks:
The release of hot water into rivers causes ______.
Water in the sea is sweet.
We should keep the tap open throughout while washing utensils.
Water pollution can spread ________ diseases in man.
How can we reduce water pollution?
The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to be 1000 ppb, 40 ppb, 100 ppm and 0.2 ppm, respectively. This water is unsuitable for drinking due to the high concentration of ______.
