The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the __________________?
Correct answer: C. Relative stability
- A. Bacterial stability factor
- B. Biological oxygen demand (BOD)
- C. Relative stability
- D. Oxygen ion concentration
Explanation
Relative stability compares the oxygen available in sewage with the oxygen required to stabilise its biodegradable matter. BOD is the oxygen requirement itself, not the ratio involving available oxygen.
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