Which of the following are common disinfectants used in sewage systems?

The correct answer identifies common disinfectants that can effectively reduce pathogens in sewage systems. In the context of sewage treatment, certain disinfectants are preferred for their effectiveness and safety. Chlorine is widely used due to its strong disinfectant properties, and iodine has applications in certain specific contexts, even if it is not as common as chlorine.

Beta Dyne and Weska Dyne may not be typical disinfectants recognized in standard sewage treatment protocols; therefore, their mention suggests potential incorrectness in the provided answer choice.

Hydrogen peroxide and ozone are indeed used in some modern treatment options due to their effectiveness in breaking down organic material and killing bacteria without the formation of harmful chlorinated by-products. However, they are not as widely recognized as chlorine-based methods.

Formaldehyde and alcohol are not commonly used in sewage treatment environments for large-scale sanitation purposes as they pose risks for toxicity and environmental concerns.

For effective sewage disinfection, chlorine and iodine remain the most practical and commonly used options, providing reliable results in pathogen reduction. Their well-documented efficacy in various water treatment practices firmly positions them as standard approaches within the industry.