Which of the following gases is a byproduct of the anaerobic breakdown of organic matter in a septic system?

The anaerobic breakdown of organic matter in a septic system primarily produces methane as a byproduct. In an anaerobic environment, where oxygen is absent, certain types of bacteria decompose organic material, leading to the production of various gases. Methane is a significant component of biogas, which is formed during this decomposition process.

Methane is particularly noteworthy because it is not only flammable but also a potent greenhouse gas. In the context of septic systems, managing methane is crucial for both operational safety and environmental considerations. While other gases like carbon dioxide are produced as well, methane is the predominant gas associated with anaerobic digestion in septic systems.