Life Cycle Assessment of Three Manure Treatment Modes in Large-scale Pig Farm

Abstract

With the rapid development of China's livestock breeding industry, it is very important to efficiently deal with the pollution caused by livestock and poultry manure. In this study, the life cycle resource consumption and pollutant emission inventory of a large-scale pig farm were analyzed by life cycle assessment (LCA). The environmental impact potentials of three different modes of livestock and poultry manure treatment were analyzed, including aerobic composting, anaerobic fermentation and black soldier fly larvae (BSFL) treatment. Results showed that the environmental loads of BSFL treatment and anaerobic fermentation were much smaller than those of aerobic composting in the life cycle process of pig manure treatment. The environmental impacts of aerobic composting process were in the order of environmental acidification, eutrophication, and global warming; while the environmental impacts of anaerobic fermentation treatment and BSFL treatment process were in the order of global warming, environmental acidification, and eutrophication. It is recommended to strengthen the emission of CO2 and NH3 in the pig manure treatment process to reduce their environmental impacts.