What is the importance of measuring BOD of water body?
 
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As we know, polluted water contains some impurities in the form of biological organic matters like algae.ln order to remove these impurities we need to breakdown these pollutants completely and this can be done by microorganism activity in presence of oxygen.So, there is a demand of oxygen for this process and this demand of oxygen is known as Biological Oxygen Demand (BOD) and is measured in parts per million (ppm). Higher BOD represents more polluted water and vice versa.BOD is an indirect way to measure the contaminations present in the water.Hence,we need to measure BOD of water in order to check its purity. Note: For clean water,BOD is 5 ppm and for dirty water,BOD is 17 ppm or more.


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