A review on enhanced biofuel production from coffee by-products using different enhancement techniques

Abstract Coffee by-products are a renewable, plentiful, cost-effective, and mostly untapped resource that could be used as biofuel feedstock. However, the energy efficiency yields determined by production technologies. Pretreatment procedure, hydrolysis methods, fermentation oil to biodiesel conversion techniques, binders employed, applying pressure temperature main factors improve from coffee by-products. This paper examines state-of-the-art methods for increasing biogas, bio-ethanol, biodiesel, briquettes, pellets outputs co-digestion of with other low carbon nitrogen ratio animal manure boost biogas yield by-products, which is also discussed. A bio-ethanol was improved using advanced pretreatment procedures, processes, use genetically modified yeast strains ferment majority sugar monomers. Additionally, extraction spent grounds were reviewed, well optimizing coffe oil. The process making briquettes pellets, types utilized, novelty this review on improving such entire dry cherry beans processing residues, wet (coffee pulp or peeled) grounds.