Mechanical Engineering, 1374 Campus Delivery, Colorado State University, Fort Collins, CO 80524, USA.
Civil and Environmental Engineering, 1372 Campus Delivery, Colorado State University, Fort Collins, CO 80523, USA.
Bioresour Technol. 2016 Dec;221:270-275. doi: 10.1016/j.biortech.2016.09.006. Epub 2016 Sep 13.
The microalgae biofuels life cycle assessments (LCA) present in the literature have excluded the effects of direct land use change (DLUC) from facility construction under the assumption that DLUC effects are negligible. This study seeks to model the greenhouse gas (GHG) emissions of microalgae biofuels including DLUC by quantifying the CO equivalence of carbon released to the atmosphere through the construction of microalgae facilities. The locations and types of biomass and Soil Organic Carbon that are disturbed through microalgae cultivation facility construction are quantified using geographical models of microalgae productivity potential including consideration of land availability. The results of this study demonstrate that previous LCA of microalgae to biofuel processes have overestimated GHG benefits of microalgae-based biofuels production by failing to include the effect of DLUC. Previous estimations of microalgae biofuel production potential have correspondingly overestimated the volume of biofuels that can be produced in compliance with U.S. environmental goals.
文献中提到的微藻生物燃料生命周期评估 (LCA) 假设设施建设中的直接土地利用变化 (DLUC) 可以忽略不计，因此排除了其影响。本研究旨在通过量化通过微藻设施建设释放到大气中的 CO 当量来模拟包括 DLUC 在内的微藻生物燃料的温室气体 (GHG) 排放。使用包括土地可用性在内的微藻生产力潜力地理模型来量化生物质和土壤有机碳的位置和类型，这些生物质和土壤有机碳通过微藻培养设施建设而受到干扰。本研究的结果表明，之前对微藻生物燃料工艺的 LCA 未能包括 DLUC 的影响，从而高估了微藻基生物燃料生产的 GHG 效益。以前对微藻生物燃料生产潜力的估计相应地高估了可以生产的生物燃料的数量，以符合美国的环境目标。
