In this review paper, recent research and developments studies dealing with the bioconversion of bioresources
and biowastes into biogas will be studied and discussed. Several kinds of natural feedstocks were analysed for their aptitude
to produce gaseous biofuels such as woods, grasses, algae, agricultural residues, industrial by-products and household
wastes. The related research studies revealed promising production yields including 400 L of methane (CH4) per Kg
of volatile solids (VS) for Willow shoots, 270 L CH4/Kg VS for macro alga Ulva lactuca and 493 L CH4/Kg VS for paper
wastes. Overall, the main objective is to present the research undertakings and findings in the scientific and industrial
communities on biogas production procedure, its influencing factors and upgrading into biomethane.
Keywords: Biomass, biogas, methane, upgrading, wastes.
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