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Consider the following statements. A. Avoid building up of sewer gases B. Ensure atmospheric pressure in the wastewater surface C. Ensure the safety of sewer maintenance people D. Provide oxidation facility to sewage Which of these statements correctly suggest why ventilation of sewer lines is necessary?

Consider the following statements. A. Avoid building up of sewer gases B. Ensure atmospheric pressure in the wastewater surface C. Ensure the safety of sewer maintenance people D. Provide oxidation facility to sewage Which of these statements correctly suggest why ventilation of sewer lines is necessary? Correct Answer Only A, B and C

Explanation:

Sewer is an underground pipe that carries sewage to a place where it can be treated.

Ventilation is required in sewer due to the following reason;

  1. To eliminate the gases accumulated in the sewer.
  2. To ensure a continuous flow of sewage into the sewer, by avoiding air blocks
  3. Some sewer gases like H2S, CO2, CH4 and petrol vapor are poisonous and explosive in nature.
  4. To ensure atmospheric pressure because high-pressure chances of busting of the pipe are increased.

NOTE: Oxidation of sewage does not take place in sewer.

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