Journal
BIORESOURCE TECHNOLOGY
Volume 179, Issue -, Pages 348-358Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.12.007
Keywords
Biogas; Life cycle assessment; Flexible power generation; Biogas plant configuration; Energy supply system
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The environmental performance of biogas plant configurations for a demand - oriented biogas supply for flexible power generation is comparatively assessed in this study. Those configurations indicate an increased energy demand to operate the operational enhancements compared to conventional biogas plants supplying biogas for baseload power generation. However, findings show that in contrast to an alternative supply of power generators with natural gas, biogas supplied on demand by adapted biogas plant configurations saves greenhouse gas emissions by 54-65 g CO2-eq MJ(-1) and primary energy by about 1.17 MJ MJ(-1). In this regard, configurations with flexible biogas production profit from reduced biogas storage requirements and achieve higher savings compared to configurations with continuous biogas production. Using thicker biogas storage sheeting material reduces the methane permeability of up to 6 m(3) d(-1) which equals a reduction of 8% of the configuration's total methane emissions. (C) 2014 Elsevier Ltd. All rights reserved.
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