Pick up the correct statement from the following: Options: A . &nbspHydrogen sulphide gas in excess, may cause corrosion of concrete sewers B . &nbsp4 ppm of Dissolved Oxygen (D.O.) is ensured before discharging the treated sewage in river C . &nbspSolubility of oxygen in sewage is 95% of that of distilled water D . &nbspAll the above

Pick up the correct statement from the following:

Question

Pick up the correct statement from the following:

Options:

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 . All the above

Answer: Option D

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