Life cycle assessment (LCA) of end‐of‐life dairy products (EoL‐DPs) valorization via anaerobic co‐digestion with agro‐industrial wastes for biogas production

Abstract

BACKGROUND:The aim of the present study was to assess the environmental impacts of end-of-life dairy products (EoL-DPs) management via their co-treatment with agro-industrial wastes (AgW) in a centralized biogas facility located in Cyprus using a gate-to-gate life cycle assessment (LCA) approach. Two different scenarios were examined under the framework of this project. In the first one, co-treatment of EoL-DPs with various AgW in a 20:80 (w/w) ratio was evaluated in a one-stage mesophilic anaerobic digestion (AD) process. In the second scenario, the same amount of EoL-DPs were acidified before methanogenesis with AgW in order to improve biogas production. RESULTS: Prior acidification ofEoL-DPs showed a better environmental performance compared with the results obtained upon direct co-digestion in a mesophilic digester, having a total impact of 52.44 Pt against 57.13 Pt respectively. Biogas production upon acidification, and therefore energy yield, was higher, reaching up to 22.88 m 3 CH 4 ton −1 feed (229.25 kWh ton −1 feed), compared with 17.45 m 3 CH 4 ton −1 feed (174.85 kWh ton −1 feed) for the case where no pretreatment was performed. CONCLUSION: The acidification of EoL-DPs enhanced the environmental performance of the process by reducing its impact by 8.2% (in Pt equivalents). The energy consumption of the biogas plant mixing equipment was identified as the process hotspot. However, further analysis of the environmental performance of the proposed process is required by extending the system's boundaries towards a cradle-to-grave approach.

Life Cycle Sustainability Evaluation of Potential Bioenergy Development for Landfills in Colombia

“…An electrical efficiency of 38 % and 46 % for thermal energy, a methane's low heating value (LHV) of 10 kWh/m 3 and a capacity factor of 8030 h/year have been assumed considering values reported in [9], [37]. The modelled installed capacity (2 MW) fits the requirements to produce the calculated electricity and heat outputs of 10 318 and 12 490 MWh/year, respectively (before losses and meeting internal demands).…”