What is a common method used to control odor from wastewater?

Controlling odor from wastewater is crucial for both environmental and public health reasons. Chemical treatment involves the use of specific chemicals that can neutralize or reduce odor compounds. This method can be effective but may not always address the issue comprehensively. Activated carbon adsorption is another common technique where activated carbon is used to capture odor molecules, thereby reducing their presence in the air. This method is effective and widely used in various settings.

Since both chemical treatment and activated carbon adsorption play significant roles in odor control, identifying "both a and c" as the correct answer captures the effectiveness and versatility of these methods in managing odors associated with wastewater. Each method has its advantages and is often employed based on the specific circumstances and requirements of a facility or situation. The inclusion of both options indicates a broader understanding of odor control strategies, making this selection appropriate.