Life cycle evaluation of emerging lignocellulosic ethanol conversion technologies.
Life cycle evaluation of emerging lignocellulosic ethanol conversion technologies.
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DOI：
10.1016/j.biortech.2009.08.067
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发表时间：
2010
影响因子：
11.4
通讯作者：
S. Spatari;D. Bagley;H. MacLean
中科院分区：
文献类型：
--
作者：
S. Spatari;D. Bagley;H. MacLean
木质纤维素乙醇有望通过降低燃料混合物的碳强度和石油需求来解决与个人交通相关的气候变化和能源安全问题。我们比较了美国近期和中期乙醇生物转化技术的技术特征和生命周期对环境的影响。评估了主要过程中的关键不确定度：前处理、水解和发酵。减少化石能源使用和温室气体(GHG)排放的潜力因生物转化过程而异，尽管所研究的所有选择都比汽油更具吸引力。预期的未来表现被发现比文献中公布的到目前为止已经实现的表现更具吸引力。电力联产信用对于确定不同乙醇生产途径对温室气体的影响很重要；然而，在没有汽油的近期液体运输燃料替代品的情况下，优化乙醇设施以生产乙醇(而不是联产)对于降低道路运输部门的碳强度和能源安全非常重要。
Lignocellulosic ethanol holds promise for addressing climate change and energy security issues associated with personal transportation through lowering the fuel mixes’ carbon intensity and petroleum demand. We compare the technological features and life cycle environmental impacts of near- and mid-term ethanol bioconversion technologies in the United States. Key uncertainties in the major processes: pre-treatment, hydrolysis, and fermentation are evaluated. The potential to reduce fossil energy use and greenhouse gas (GHG) emissions varies among bioconversion processes, although all options studied are considerably more attractive than gasoline. Anticipated future performance is found to be considerably more attractive than that published in the literature as being achieved to date. Electricity co-product credits are important in characterizing the GHG impacts of different ethanol production pathways; however, in the absence of near-term liquid transportation fuel alternatives to gasoline, optimizing ethanol facilities to produce ethanol (as opposed to co-products) is important for reducing the carbon intensity of the road transportation sector and for energy security.