How is the amount of biodegradable organic matter in sewage water estimated?

How is the amount of biodegradable organic matter in sewage water estimated?

Q. How is the amount of biodegradable organic matter in sewage water estimated?

  1. Chemical Oxygen Demand
  2. Physical Oxygen Demand
  3. Biological Oxygen Demand
  4. Mathematical Oxygen Demand

Answer: Biological Oxygen Demand

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