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Waste Water Engineering

Q1: Pick up the correct statement from the following :

A Hydrogen sulphide gas in excess, may cause corrosion of concrete sewers

B 4 ppm of Dissolved Oxygen (D.O.) is ensured before discharging the treated sewage in river

C Solubility of oxygen in sewage is 95% of that of distilled water

D Dissolved oxygen content of sewage, may be determined by Winkler's method

E All the above.

ANS:E - All the above.

The correct statement from the options provided is: "All the above." Each of the statements listed is accurate:

  1. Hydrogen sulphide gas in excess may cause corrosion of concrete sewers.
  2. 4 ppm of Dissolved Oxygen (D.O.) is ensured before discharging the treated sewage in the river.
  3. The solubility of oxygen in sewage is 95% of that of distilled water.
  4. Dissolved oxygen content of sewage may be determined by Winkler's method.
Therefore, the correct option is that all of the statements are correct.



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