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Biomethane is an energy product obtained biologically by anaerobic digestion (AD) as well as through bioelectrochemical systems or electromethanogenesis. The coupling of AD with microbial electrolysis cell systems aims to increase the yield and purity of methane. In this process, there are two routes to produce methane: (1) via electrochemistry in which CO2 reacts with protons and electrons to be reduced to CH4 and (2) biologically by hydrogenotrophic microorganisms that improve the production rate and yield. This chapter discusses the types of microorganisms involved in the metabolic pathways, the cell architecture, as well as the types of electrodes and materials utilized in the configuration of the cells. The impacts of operating conditions such as pH, temperature, organic load, and substrates on the process are reviewed. Finally, the challenges and future directions are discussed. |
