Biogas is the product of anaerobic biological breakdown of organic substances. It is produced by any anaerobic technology when conditions are suitable for methane production and can be generated by bacteria from organic waste solids (in digesters) or from wastewater containing organic material.

Anaerobic ponds or lagoons are a common treatment step of wastewater produced from the meat industry. The technology is simple and inexpensive to operate while significantly reducing the wastewater organic loading.