Anaerobic digestion is proposed to produce biogas and enhance the methane production by identifying the best substrate. This paper reviews the biogas production from anaerobic digestion of various wastes. Feedstock composition is one of the major factors that affect the production of biogas.
High yields of methane depend mainly on the substrates used as feeding material. However, the difference in total methane yield varies based on the type of interactions between different wastes that interfere with digestibility of wastes in the system. The rate of digestion of organic wastes depends mainly on the relative proportion of the component, the amount of the mixture and other physical variables such as temperature and pressure. There is limited information on the optimum conditions that can enhance methane yields and treatment of residues. It is, therefore, recommended that optimum conditions for anaerobic co-digestion must be investigated as well as treatment of sludge to manage the landfill crisis.