title: Life-cycle energy efficiency and environmental impacts of bioethanol production from sweet potato.
abstract: Life-cycle assessment (LCA) was used to evaluate the energy efficiency and environmental impacts of sweet potato-based bioethanol production. The scope covered all stages in the life cycle of bioethanol production, including the cultivation and treatment, transport, as well as bioethanol conversion of sweet potato. Results show that the net energy ratio of sweet potato-based bioethanol is 1.48 and the net energy gain is 6.55 MJ/L. Eutrophication is identified as the most significant environmental impact category, followed by acidification, global warming, human toxicity, and photochemical oxidation. Sensitivity analysis reveals that steam consumption during bioethanol conversion exerts the most effect on the results, followed by sweet potato yields and fertilizers input. It is suggested that substituting coal with cleaner energy for steam generation in bioethanol conversion stage and promotion of better management practices in sweet potato cultivation stage could lead to a significant improvement of energy and environmental performance.
authors: College of Environmental & Safety Engineering, Changzhou University, Changzhou 213164, China. wmxcau@163.com
authors: Mingxin
authors: M
authors: Wang
authors: Yu
authors: Y
authors: Shi
authors: Xunfeng
authors: X
authors: Xia
authors: Dinglong
authors: D
authors: Li
authors: Qun
authors: Q
authors: Chen
mesh_terms: D056804:Biofuels / Q000032:analysis*; D004777:Environment; D000431:Ethanol / Q000378:metabolism*; D005068:Eutrophication; D057232:Global Warming; D006801:Humans; D027723:Ipomoea batatas / Q000737:chemistry*; D010084:Oxidation-Reduction; D055668:Photochemical Processes; D012015:Reference Standards; D013816:Thermodynamics
chemical_list: D056804:Biofuels; D000431:Ethanol