Life Cycle Assessment of Greenhouse Gas Emissions from Livestock and Food Wastes Co-digestive Biogas Production System

ABSTRACT: Biogas plant with anaerobic digestion is receiving high attention as a facility for both livestockwaste treatment and electric power generation. Objective of this study was to perform life cycle assessment(LCA) of a biogas plant which incorporates swine and food waste (7:3) as source materials for biogasproduction. In addition, the biogas production process was compared with the prevalent composting methodas a reference in the aspects of green house gas (GHG) reduction potential and environmental impact. Thebiogas method was capable of reducing 52 kg CO 2 eq. emission per ton of swine/food waste, but thecomposting process was estimated to emit 268 kg CO 2 eq. into air. The biogas method was evaluated asmore beneficial to the environment by mitigating the impact on abiotic depletion potential (ADP), globalwarming potential (GWP), ozone depletion potential (ODP), eutrophication potential (EP), and photochemicalozone creation potential (POCP), but not to acidification potential (AP).Key Words: