Which of the following is considered a potential byproduct of sewage treatment?

In the context of sewage treatment, it is essential to understand the various byproducts that can arise during the treatment process. Both hydrogen sulfide and sewage sludge are recognized as potential byproducts.

Sewage sludge results from the solid waste and organic materials that settle out during treatment processes. This sludge typically contains a mixture of organic matter, microorganisms, and nutrients, and it can often be further treated and processed for use in agriculture or disposed of in landfills.

Hydrogen sulfide, on the other hand, is a gas that can be produced during the anaerobic breakdown of organic materials in sewage. This byproduct can be harmful in concentrated forms and is often associated with the characteristic odor of rotten eggs, making it a concern in sewage treatment operations.

Recognizing that both of these components emerge from sewage treatment processes justifies the choice that includes both as potential byproducts. The option stating both hydrogen sulfide and sewage sludge reflects a comprehensive understanding of the byproducts that can emanate from sewage treatment, making it the correct answer.