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  • Environmental Pollution (Class VIII)
  • What happens in secondary treatment of sewage water?
Multiple choice

What happens in secondary treatment of sewage water?

  1. Large objects and undissolved impurities are removed.

  2. Water is aerated.

  3. Nitrates and phosphates are removed.

  4. Germs are killed by adding chlorine.

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Water is aerated to promote bacterial decomposition in secondary treatment.

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