The measurement of $BOD$ (Biochemical Oxygen Demand) in wastewater provides information about the amount of which of the following?

  • A
    Nitrates
  • B
    Phosphates
  • C
    Biodegradable organic matter
  • D
    Toxic metals

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The key substance between primary and secondary treatment in Sewage Treatment Plants $(STP)$ is?

Select the correct statement from the following:

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