The main reason for chlorinating wastewater in sewers is for ____ control

The main reason for chlorinating wastewater in sewers is for ____ control

• A. Odor
• B. BOD
• C. Pathogen
• D. Suspended solids

Answer: (A)

Chlorination in sewer lines is used primarily to control odors. In sewer pipes, anaerobic conditions can produce hydrogen sulfide, which leads to strong rotten-egg smells and can promote pipe corrosion. Chlorine acts as a strong oxidant and reacts with hydrogen sulfide, turning it into less odorous compounds and helping to limit corrosion, which keeps the sewer system healthier overall. This purpose is distinct from removing BOD or suspended solids, which are handled by biological treatment and physical separation rather than chemical dosing. While some disinfection of pathogens can occur with chlorine, the main reason for dosing in sewers is odor (and corrosion) control, not in-sewer removal of organic matter or solids.

Chlorination in sewer lines is used primarily to control odors. In sewer pipes, anaerobic conditions can produce hydrogen sulfide, which leads to strong rotten-egg smells and can promote pipe corrosion. Chlorine acts as a strong oxidant and reacts with hydrogen sulfide, turning it into less odorous compounds and helping to limit corrosion, which keeps the sewer system healthier overall. This purpose is distinct from removing BOD or suspended solids, which are handled by biological treatment and physical separation rather than chemical dosing. While some disinfection of pathogens can occur with chlorine, the main reason for dosing in sewers is odor (and corrosion) control, not in-sewer removal of organic matter or solids.