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  • The process involved in the secondary treatment of sewage...
Multiple choice

The process involved in the secondary treatment of sewage is _____________.

  1. chemical process

  2. physical process

  3. mechanical process

  4. biological process

  5. physical and chemical processes

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

Secondary treatment of sewage is biological, i.e. by using microbes.

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