生产乙醇过程中用二氧化碳中和氧化钙预处理玉米秸秆的生命周期评估。
Life cycle assessment of calcium oxide pretreatment of corn stover with carbon dioxide neutralization for ethanol production.
机构信息
School of Earth, Environmental, and Marine Sciences, The University of Texas Rio Grande Valley, Edinburg, TX 78539, USA; Department of Biology, The University of Texas Rio Grande Valley, Edinburg, TX 78539, USA.
Department of Civil and Environmental Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA.
出版信息
Bioresour Technol. 2023 Jul;379:129042. doi: 10.1016/j.biortech.2023.129042. Epub 2023 Apr 8.
This work used life-cycle assessment (LCA) to determine the environmental and human health impacts of four ethanol production scenarios (S1: CaO pretreatment + HSO neutralization + C6 yeast fermentation; S2: CaO pretreatment + CO neutralization + C6 yeast fermentation; S3: CaO pretreatment + HSO neutralization + C6/C5 yeast fermentation; and S4: CaO pretreatment + CO neutralization + C6/C5 yeast fermentation), with the functional unit being 1 kg of 95 % ethanol. TheLCA results showed that the total ozone depletion, global warming potential, smog, acidification, eutrophication, and ecotoxicity values were comparable when CO or HSO were used to adjust the pH of CaO-pretreated slurry. However, using CO for neutralization and C6/C5 yeast for fermentation demonstrated significant benefits in terms of carcinogenicity, non-carcinogenicity, respiratory effect, ecotoxicity, and fossil fuel depletion. The findings indicate that the choice of chemicals and strains plays a key role in determining environmental and human health impacts.
本研究采用生命周期评价（LCA）方法，以 1 公斤 95%乙醇为功能单位，评估了四种乙醇生产方案（S1：CaO 预处理+ HSO 中和+ C6 酵母发酵；S2：CaO 预处理+ CO 中和+ C6 酵母发酵；S3：CaO 预处理+ HSO 中和+ C6/C5 酵母发酵；S4：CaO 预处理+ CO 中和+ C6/C5 酵母发酵）的环境和人类健康影响。LCA 结果表明，当使用 CO 或 HSO 来调节 CaO 预处理浆液的 pH 值时，总臭氧消耗、全球变暖潜能值、烟雾、酸化、富营养化和生态毒性值相当。然而，采用 CO 中和和 C6/C5 酵母发酵在致癌性、非致癌性、呼吸效应、生态毒性和化石燃料消耗方面具有显著优势。研究结果表明，化学品和菌株的选择在确定环境和人类健康影响方面起着关键作用。
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