Abstract
Anaerobic digestion (AD) is an environmentally friendly and economically feasible process for organic wastes treatment for the generation of value-added products such as biogas, volatile fatty acids (VFA), bio-hydrogen, alcohols, and bio-manure. Hence, it is being practiced widely across the globe for the treatment of organic waste especially for the generation of biogas. However, in the recent past, AD process is getting modified to suit to the requirements of local conditions and constraints, waste characteristics, output specifications, etc. Many technologies including pre- and post-AD processes are developed for increasing the biogas generation. This chapter encompasses recent advances of biogas production through substrate pretreatment, phase separation strategy, solid state AD, substrate codigestion, and biogas purification technologies. It also comprises capturing carbon dioxide (CO2) from raw biogas by using different algae in order to increase the methane concentration. The world’s future energy needs can be met by developing or introducing new advances in AD technologies. In this chapter, various new advances in AD are discussed.
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