Life cycle environmental impacts of compressed biogas production through anaerobic digestion of manure and municipal organic waste

Compressed biogas (CBG) has proven to reduce greenhouse gas (GHG) emissions compared fossil diesel, but due diverging methodologies, results of different studies lie far apart. The usage the co-produced digestate can lead high acidification and eutrophication impacts, this aspect is often not considered, neither way substitution methods for affect results. In work we address these issues performing a Life Cycle Assessment (LCA) CBG production through anaerobic digestion animal manure municipal organic waste (MOW). GHG savings 93%–131% diesel benchmark in Renewable Energy Directive were found, thus complying with 60% reduction target. ammonia during application make terrestrial main environmental burdens from MOW, leading 142% 715% increase respectively, diesel. When produced avoidance storage emission 257% 700% lower impact was found. Our suggest that better manure-storage techniques are required field application, which sensitive pH nitrogen content, should be reduced. It further demonstrated including fertilizing system boundaries LCA both mineral fertilizer have great on outcome, also introduce uncertainty outcome used recommendations methodology future EU biofuel regulations.