Which of the following is NOT a chemical coagulant used in water treatment?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. Nitrogen dioxide.
- Aluminium sulfate is the most commonly used chemical for coagulation in wastewater treatment.
- It also include sodium aluminate, ferric sulfate, and ferric chloride.
- Nitrogen Dioxide (NO2) is one of a group of highly reactive gases known as oxides of nitrogen or nitrogen oxides (NOx).