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Why is DO content low after thermal pollution?

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Question

Why is DO content low after thermal pollution?

Very Short Answer
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Solution

Higher water temperature reduces the solubility (dissolution rate) of oxygen in water. Hot water discharged from power plants raises water temperature, decreasing DO. Also, hot water increases microbial activity which consumes more oxygen.

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Chapter 20: Environmental Issues - EXERCISES [Page 1160]

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Sarita Aggarwal Biology [English] Class 12 ISC
Chapter 20 Environmental Issues
EXERCISES | Q II. 15. | Page 1160
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