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The potential for biogas production from autumn tree leaves to supply energy and reduce greenhouse gas emissions – A case study from the city of Berlin
Resources, Conservation and Recycling ( IF 13.2 ) Pub Date : 2022-08-27 , DOI: 10.1016/j.resconrec.2022.106598
Andrés de Jesús Vargas‐Soplín, Annette Prochnow, Christiane Herrmann, Bianka Tscheuschner, Ulrich Kreidenweis

Autumn tree leaves are residues that are generated annually and usually composted, but can also be used as a feedstock for biogas production. In this study, three scenarios were analysed to evaluate the utilization of tree leaves from the city of Berlin in Germany: a) composting (business-as-usual scenario); b) biogas production; and c) the pretreatment of leaves before biogas production. For these scenarios, greenhouse gas emissions and energy production potential were calculated using the biological resource utilization impacts (BIORIM) model and considering the location and capacity of existing agricultural biogas plants. A special focus was set on the decay of leaves before their entry into the biogas plant. The overall comparison showed that the biogas-related scenarios had a better performance in terms of greenhouse gas emissions (-140.1 kg of CO2eq per tonne of leaves for biogas and -167.4 kg of CO2eq for pretreatment before biogas) than the business-as-usual scenario (49.0 kg of CO2eq for composting). The pretreated leaves resulted in the lowest net emissions and highest energy production per tonne of feedstock. Measures to reduce the decay of leaves, such as increasing the loading to the biogas plant or ensiling, resulted in lower net emissions and higher energy output. However, further research is needed regarding costs and logistical feasibility for proper implementation. Using tree leaves for biogas production would represent an alternative energy source, which could reduce the share of fossil fuels and electricity imports for the city of Berlin, where about 7.5 metric ton of pretreated leaves would meet the average electrical energy consumption of one person in one year.



中文翻译:

秋季树叶生产沼气以提供能源和减少温室气体排放的潜力——柏林市的案例研究

秋季树叶是每年产生的残留物,通常用于堆肥,但也可用作沼气生产的原料。在这项研究中,分析了三种情景来评估德国柏林市树叶的利用率:a) 堆肥(一切照旧情景);b) 沼气生产;c) 在产生沼气之前对叶片进行预处理。对于这些情景,使用生物资源利用影响 (BIORIM) 模型并考虑现有农业沼气厂的位置和容量来计算温室气​​体排放和能源生产潜力。特别关注叶子在进入沼气厂之前的腐烂。总体比较表明,沼气相关情景在温室气体排放方面具有更好的表现(-140.沼气每吨叶子 2eq 和沼气前预处理的 -167.4 kg CO 2eq 比一切照旧情景(49.0 kg CO 2eq用于堆肥)。预处理的叶子导致每吨原料的净排放量最低和能源产量最高。减少叶子腐烂的措施,例如增加沼气厂的负荷或青贮,导致净排放量减少和能源输出增加。然而,需要进一步研究成本和后勤可行性以正确实施。使用树叶生产沼气将代表一种替代能源,这可以减少柏林市化石燃料和电力进口的份额,大约 7.5 公吨经过预处理的树叶可以满足一个人的平均电能消耗年。

更新日期:2022-08-27
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