Dive into the 2025 NY Wastewater Exam – Flush Away the Competition with Confidence!

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What is a common chemical used for dechlorination?

Sodium hypochlorite

Chlorine gas

Sulfur dioxide

Sulfur dioxide is commonly used for dechlorination due to its effectiveness in neutralizing chlorine in wastewater. In the treatment process, it reacts with chlorine to form chloride ions, which are less harmful to aquatic life and the environment. This makes sulfur dioxide an important chemical in the wastewater treatment industry, particularly in facilities where chlorine is employed as a disinfectant.

Sodium hypochlorite typically serves as a source of chlorine for disinfection rather than dechlorination. Chlorine gas, like sodium hypochlorite, is used for disinfection purposes and is not suitable for removing chlorine from treated water. Hydrochloric acid is primarily used to adjust pH levels and does not perform dechlorination effectively. Hence, sulfur dioxide stands out as the appropriate choice for dechlorination in wastewater treatment processes.

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Hydrochloric acid

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