Which of the following is NOT a common form of odor control?

Chlorine dioxide is typically not categorized as a common form of odor control in wastewater treatment. While it is used for its disinfection properties and to control odor in specific circumstances related to bacterial and organic matter breakdown, it does not function primarily as an odor control agent like the other options.

Scrubbers, for instance, are widely employed for removing odorous compounds from the air by passing the gas through a liquid that absorbs the pollutants. This process effectively captures various volatile organic compounds and contributes significantly to managing odors.

Hydrogen peroxide is also used for odor control, particularly due to its oxidizing properties that can break down organic materials responsible for unpleasant smells.

Ozone is known for its strong oxidizing capability, which allows it to eliminate odors effectively by reacting with and breaking down odorous compounds in the air or wastewater.

Therefore, while chlorine dioxide has its place in wastewater treatment, especially for disinfection and foul odor mitigation in certain contexts, it is less recognized as a common method specifically focused on odor control compared to scrubbers, hydrogen peroxide, and ozone.