Question

During the first step of wastewater treatment

• A. Amount of oxygen is decreased.
• B. Amount of oxygen is increased.
• C. Amount of chlorine is decreased.
• D. Amount of chlorine is increased.

Answer 1

The correct option is B

Amount of oxygen is increased.

The first step of wastewater treatment is aeration in which air is mixed with water. During aeration, the amount of oxygen is increased in water. Chlorine is added during wastewater treatment to sterilize the filtered water. This process known as chlorination and it is the fifth step followed during wastewater treatment.