Energy production from farming waste: a review

The global increase in greenhouse gas emissions is mainly due to electricity and heat generation, transportation, manufacturing and construction, and agriculture. In particular, agriculture produces underutilized waste that generates greenhouse gas emissions and other pollutants. Here we review the conversion of farming waste into energy, with focus on waste from agriculture, livestock, poultry, and pisciculture. Energy production techniques include pelletization, pyrolysis, gasification, liquefaction, anaerobic digestion, and fermentation. In thermochemical processes, the biofuel yield is controlled by temperature, pressure, heating rate, feedstock concentration, reaction time, catalysts, and reactor type. In biological processes, the biofuel yield is controlled by pretreatment intensity, microorganisms, substrate loading, temperature, volatile solids, reaction time, and inhibitors.