Co-fermentation Fermentation 2 Acidic conditions 1 Alkaline conditions 1 Alkalinity 1 Bioethanol 1 Biogas 1 Biogas production 1 Biomass 1 Carbon substrates 1 Cofermentation 1 Directed evolution 1 Economically viable 1 Enzymatic pretreatment 1 Enzyme 1 Enzyme cocktails 1 Enzymes 1 Ethanol 1 Extracellular 1 Glucose 1 High activity 1 Municipal waste 1 Municipal waste streams 1 Piromyces sp 1 Pretreatment 1 Pretreatment methods 1 Propionic acid 1 Saccharomyces cerevisiae 1 Saturated fatty acids 1 Secretion 1