explain biological oxygen demand?
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The biochemical oxygen demand (BOD) is the amount of oxygen that is required for the performance of the activities of a biological organism (one example is a bacterium) or a portion of the organism (one example is the digestion of food by the human body).
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BOD indicates the amount of putrescible organic matter present in water. Therefore, a low BOD is an indicator of good quality water, while a high BOD indicates polluted water. Dissolved oxygen (DO) is consumed by bacteria when large amounts of organic matter from sewage or other discharges are present in the water.
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