Multiple choice

Which one of the following wastes is not present in the clarified water?

  1. Soap

  2. Food waste

  3. Plastics and oil

  4. Human waste
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Clarified water has had settleable solids removed through primary treatment, but plastics and oil would not remain - plastics float or are screened out early, and oils/greases are skimmed off. Clarified water still contains dissolved contaminants like soap, food waste particles, and some organic matter.

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