Multiple choice

Which of the following is not a step involved in the primary treatment stage of the sewage? a. Passage of liquid through sedimentation tanks. b. Treatment of liquid with chlorine to kill disease causing organisms. c. Passage of liquid through a tank to remove dirt and sand.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Treatment of liquid with chlorine to kill disease causing organisms, is not a step involved in the primary treatment stage of sewage. The liquid is treated with chlorine at the last stage, which is called tertiary treatment.

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