In sewage treatment, what is the end product of anaerobic digestion?

In the process of anaerobic digestion, microorganisms break down organic matter in the absence of oxygen. This biological process transforms the organic material, such as food waste and sewage sludge, into biogas and digestate. The biogas primarily consists of methane, which is a valuable renewable energy source. Methane can be harnessed for heating, electricity generation, or even as a vehicle fuel.

While other options like clean drinking water, compost material, and solid waste residues may be byproducts or associated outputs in sewage treatment, they are not the primary end product of anaerobic digestion itself. Instead, the focus is on the production of biogas, which plays a crucial role in energy sustainability within waste management practices.