COD of water is checked by:
Correct answer: C. Both (A) and (B)
- A. By adding bacteria to the water
- B. Adding chemical oxidizing agent
- C. Both (A) and (B)
- D. None of the above
Explanation
To check the Chemical Oxygen Demand (COD) of water, you typically add bacteria and an oxidizing agent to the water sample. The bacteria help break down the organic matter in the water, while the oxidizing agent helps determine the amount of oxygen required for the oxidation process. By measuring the amount of oxygen consumed, you can determine the COD of the water sample.
This question appeared on the KMU Centralized Admission Test 2020 paper, which you can sit online with every answer explained.
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About Water Pollution and Treatment
Water pollution covers biological, chemical and physical contaminants, including pathogens, toxic metals, detergents and excess nutrients. Treatment involves screening, sedimentation, coagulation, filtration, disinfection and wastewater processing, while biochemical oxygen demand, chemical oxygen demand, eutrophication and dissolved oxygen indicate pollution levels.
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