Pick up the correct statement from the following?

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

B. Solubility of oxygen in sewage is 95% of that of distilled water

C. All the above

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

Found an error? Read our corrections policy and submit a sourced correction below. You can also share a useful explanation in your own words.

Discuss the answer or suggest a sourced correction
Thank you for contributing.
Your comment was submitted and will appear after editorial review.

Your email is used only for moderation and is never displayed. Spam, copied material and fabricated endorsements are rejected.