ABSTRACT
Today, society analyses obtaining alternative forms of energy with environmental benefits. One approach is the use of chemical energy contained in waste for its conversion to energy forms such as biohydrogen and bioelectricity. In recent years, bioelectrochemical systems (BES) have been developed as biotechnological option. In BES, microorganisms act as biocatalysts for electrochemical reactions that take place in an electrochemical cell. BES has emerged as a promising technology for the recovery of bioenergy and other high-value products from waste. The technology associated is gaining importance due to its sustainable nature. The process provides multiple benefits for wastewater treatment and access to cheap and environmental friendly energy, because high organic load is no longer seen as waste, but considered as a valuable energy resource. This chapter discusses the processes of electrogenic microorganisms as identified major metabolic pathways for electron transfer in BES. The metabolic processes for extracting energy required to produce biomass and the redox processes for electron donor/acceptor reactions are discussed. The advances in obtaining metabolites produced by electrogenic bacteria such as Pseudomonas aeruginosa for indirect transport of electrons and their applications in others areas are explained.
