“…Regarding Biofuel Production, six articles mainly focused on the production of methane and hydrogen from a variety of waste streams were included. Vital-Jácome et al 18 reported that transient shifts of hydraulic retention time improve the methane production in UASB reactors using ruminal hydrolysates of agave bagasse as substrate. In Mexico, valorization of residues from tequila industry is a central objective of local authorities and this work showed the potential of these residues for generating renewable energy.…”