3.1. Variations in feedstock supply logistics
3.1.1. Single feedstock digestion
The LCIA results for single feedstock digestion are presented in Table 1. The results show that there were significant variations in all impact categories among the scenarios considered, which indicates that feedstock choice is important in management of life-cycle impacts in single feedstock digestion. For example, for climate change (CC) impact category, i.e., greenhouse effect, straw feedstock could achieve up to ten times higher impact reduction compared to base scenario of cattle manure (23.22 kg CO2-eq). The main attribute was the higher biogas yield for straw (293.2 m3 t1) compared to cattle manure (23.7 m3 t1), leading to corresponding substitution of fuel for electricity generation in Germany’s production mix (Pöschl et al., 2010).
3.1. Variations in feedstock supply logistics
3.1.1. Single feedstock digestion
The LCIA results for single feedstock digestion are presented in Table 1. The results show that there were significant variations in all impact categories among the scenarios considered, which indicates that feedstock choice is important in management of life-cycle impacts in single feedstock digestion. For example, for climate change (CC) impact category, i.e., greenhouse effect, straw feedstock could achieve up to ten times higher impact reduction compared to base scenario of cattle manure (23.22 kg CO2-eq). The main attribute was the higher biogas yield for straw (293.2 m3 t1) compared to cattle manure (23.7 m3 t1), leading to corresponding substitution of fuel for electricity generation in Germany’s production mix (Pöschl et al., 2010).
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