Which chemical is used to treat polluted water in wastewater treatment plants?

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Chlorine

Hydrochloric acid

Sodium Chloride

Oxygen

answer is B.

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Detailed Solution

Chemicals like chlorine and ozone are used to treat wastewater/polluted water in the wastewater treatment plants.

When chlorine is added to wastewater, it reacts with organic matter and other pollutants to form oxidising agents that can destroy pathogens and other contaminants. Chlorine is relatively inexpensive and easy to use, which makes it a popular choice for wastewater treatment.

Ozone is a highly reactive gas that is also used as a disinfectant in wastewater treatment. When ozone is added to wastewater, it reacts with organic matter and other pollutants to form hydroxyl radicals, which are powerful oxidising agents that can destroy pathogens and other contaminants.

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