The presence of microorganisms in drinking water is determined by:
Correct answer: C. BOD
- A. COD
- B. TOC
- C. BOD
- D. TDS
Explanation
Biochemical oxygen demand (BOD) is a chemical procedure for determining the amount of dissolved oxygen needed by microorganisms in a body of water to break down organic material present in a given water sample at a certain temperature over a specific period. The greater the value of BOD, the more rapidly oxygen is depleted in water bodies. This means less oxygen is available to higher forms of aquatic life.
This question appeared on the ETEA MDCAT 2015 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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