 Anaerobic digestion AD is a promising technology for treating or processing organic biomass waste. It involves the conversion of organic material into biogas, which can then be used as a source of renewable energy. AD process technologies include classification, mechanisms, process variables and kinetic models. Future research should focus on reducing operational costs, developing integrated or hybrid AD biorefinery technology, thermochemical processes, novel reactors, nutrient recovery, and solid and liquid residue disposal methods. This article was authored by Alia Wafun Malayo-Abiola-Awaranti, Aliasai Omotoso-Egbid, Samuel Anahoro-Agari, and others.