Carbon Footprint Analysis of Bioenergy Production from Cattle Manure in the Brazilian Central-West

Autor: Elisa Maria Mano Esteves, Cláudia do Rosário Vaz Morgado, Victor Paulo Peçanha Esteves, Ana Maria Naranjo Herrera
Rok vydání: 2020
Předmět:
Zdroj: BioEnergy Research. 14:1265-1276
ISSN: 1939-1242
1939-1234
Popis: This article reports a carbon footprint analysis of bioelectricity generation from cattle manure obtained from feedlot systems in the Brazilian Central-West region. The analyses were performed by applying two different energy source scenarios: Sc1—using external energy in an anaerobic digestion (AD) plant; and Sc2—recirculating part of the energy generated in a combined heat and power (CHP) plant, with two approaches (allocation and system expansion) for sharing impacts between the products and co-products obtained in the cycle. In addition, the generation of electricity from manure was compared with generation from natural gas (reference system). The greenhouse gas (GHG) emissions were calculated using data from the Intergovernmental Panel on Climate Change Guidelines and the SimaPro software. Sc2 was the best scenario, since the energy recirculation from the system reduces emissions from the AD plant by up to 83.61%. Both scenarios with system expansion present emissions ≈4.5 times greater than when allocation was applied, because allocation splits emissions between products obtained, removing the production chain’s responsibility for the co-products generated. The manure management was responsible for more than 65% of emissions in both scenarios, making emissions in both scenarios higher than the reference system. There is a need to improve distribution logistics of AD-CHP plant products in the Central-West region, since bioenergy generation can mitigate GHG emissions from livestock activity by turning manure residue cost into a gain, and generating products with energy and market value, to make the process more efficient and environmentally friendly.
Databáze: OpenAIRE
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