Discussion
Which one of the following is observed when analysed organically polluted water ?
Answer: C
Organically polluted water shows low D.O. and high BOD.
Organic waste, such as sewage, is food for bacteria. They consume dissolved oxygen as they decompose it, so the biochemical oxygen demand (the oxygen needed to break down the organic load) is high, and the dissolved oxygen left in the water falls.
Low D.O. with low BOD would point to some other oxygen sink, not organic pollution. High D.O. with high BOD cannot last, because the high demand uses up the oxygen. D.O. and BOD being equal has no diagnostic meaning.
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