The greenhouse gas performance and climate change mitigation potential from rice straw biogas as a pathway to the UN sustainable development goals
The greenhouse gas performance and climate change mitigation potential from rice straw biogas as a pathway to the UN sustainable development goals
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DOI：
10.1016/j.biombioe.2024.107072
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发表时间：
2024-03
影响因子：
6
通讯作者：
M. Röder;P. Thornley;Craig Jamieson
中科院分区：
文献类型：
--
作者：
M. Röder;P. Thornley;Craig Jamieson
水稻作为主要农作物，对亚洲的粮食安全作出了贡献。然而，其副产品稻草往往以不可持续的方式处置，因此带来了挑战。本研究调查了菲律宾拉古纳1000 m3稻草沼气中试工厂的环境性能。生命周期评估确定了沼气系统、秸秆燃烧和土壤结合对气候变化的影响。除了GWP 100之外，还评估了全球温度潜势的动态气候效应，包括综合辐射强迫和瞬时温度效应。水稻生产的生物源排放通量的时间框架是特别相关的，因为在植物生长过程中封存的CO2部分释放为甲烷和CO2，这取决于秸秆管理措施。秸秆焚烧对净排放的影响最大。然而，秸秆还田具有最高的短期辐射强迫和温度升高。当沼气取代燃烧或土壤结合以及化石燃料的使用时，沼气系统提供了高达68%的显著的短期和长期温室气体减排。尽管如此，关于逃逸性甲烷排放、处理和后处理的不确定性仍然很大。虽然以GWP 100为基础的单一温室气体排放数字有助于为决策提供信息，但这种单一度量方法限制了对水稻生产短期和长期影响的理解。此外，我们的评估强调了促进水稻种植可持续实践的治理框架的必要性，因为禁止稻草燃烧可能会导致土壤结合的不利结果，而整合沼气提供了一个有利于水稻种植社区和全球可持续发展努力的解决方案。
Rice, as a main crop, contributes to food security in Asia. However, its by-product, rice straw, poses challenges as it is often disposed of unsustainably. This research investigates the environmental performance of a 1000 m3rice straw biogas pilot plant in Laguna, Philippines. A lifecycle assessment identified the climate change impact of the biogas system, straw burning and soil incorporation. In addition to GWP100, the global temperature potential's dynamic climate effects were assessed, including integrated radiative forcing and instantaneous temperature effects. The timeframe of the biogenic emission fluxes of rice production is particularly relevant as the sequestered CO2during plant growth is partly released as methane and CO2, depending on the straw management practices. Straw burning had the highest net emission impact. However, straw incorporation has the highest short-term radiative forcing and temperature increase. The biogas system provided significant short- and long-term GHG emission reduction of up to 68 % when biogas replaced burning or soil incorporation and the use of fossil fuels. Still, considerable uncertainties remain about fugitive methane emissions, handling and post-processing of the digestate. While single GHG emission figures on a GWP100 basis are useful for informing decision-making, this single-metric approach limits understanding of rice production's short- and long-term impacts. Additionally, our assessment emphasises the necessity for governance frameworks that promote sustainable practices in rice farming, as banning rice straw burning may result in less favourable outcomes from soil incorporation, whereas integrating biogas offers a solution benefiting rice-growing communities and global sustainability efforts.