An anticipatory life cycle assessment of the use of biochar from sugarcane residues as a greenhouse gas removal technology
An anticipatory life cycle assessment of the use of biochar from sugarcane residues as a greenhouse gas removal technology
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DOI：
10.1016/j.jclepro.2021.127764
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发表时间：
2021-08
影响因子：
11.1
通讯作者：
D. Lefebvre;A. Williams;G. Kirk;J. Meersmans;S. Sohi;Pietro Goglio;Peter Smith
中科院分区：
文献类型：
--
作者：
D. Lefebvre;A. Williams;G. Kirk;J. Meersmans;S. Sohi;Pietro Goglio;Peter Smith
要实现《联合国气候变化框架公约巴黎协定》的目标，就需要温室气体清除技术。在现有技术中，生物炭的使用被认为是有前途的，特别是从南美洲和其他地方的大量甘蔗渣中提取的生物炭。然而，迄今为止尚未评估甘蔗生物炭的净温室气体去除潜力。我们使用一个基于生命周期的预测评估，调查与变化相关的排放量从甘蔗渣燃烧的热电联产厂，这些残留物的热解生物炭生产和现场应用在圣保罗州，巴西。我们根据不同的平均边际发电量和生物炭产量份额定义情景。结果表明，生物质部分燃烧产生的电力赤字，在生物炭生产过程中，弥补排放的主要过程。总体而言，与生物炭生产相关的过程将生物炭的净温室气体效益降低了约25%。我们的分析表明，在圣保罗州，将100%的可用甘蔗残渣用于生物炭生产可以封存6.3 ± 0.5吨CO2eq ha−1yr− 1的甘蔗。如果扩大到整个州，这种做法可能导致2016年该州温室气体排放总量的23%被清除。
Greenhouse gas removal technologies are needed to reach the targets of the UNFCCC Paris Agreement. Among existing technologies, the use of biochar is considered promising, particularly biochar derived from the large quantities of sugarcane residues available in South America and elsewhere. However, the net greenhouse gas removal potential of sugarcane biochar has not been assessed hitherto. We use a scenario-based anticipatory life cycle assessment to investigate the emissions associated with a change from the combustion of sugarcane residues in a combined heat and power plant to the pyrolysis of these residues for biochar production and field application in São Paulo State, Brazil. We define scenarios based on different mean marginal electricity production and biochar production share. The results indicate that emissions from covering the electricity deficit generated by partial combustion of biomass during biochar production is the main emitting process. Overall, the processes associated with biochar production lower the net greenhouse gas benefits of the biochar by around 25%. Our analysis suggests that allocating 100% of the available sugarcane residues to biochar production could sequester 6.3 ± 0.5 t CO2eq ha−1yr−1of sugarcane in São Paulo State. Scaled up to the entire State, the practice could lead to the removal of 23% of the total amount of GHGs emitted by the State in 2016.