Multi-product biorefineries from lignocelluloses: a pathway to revitalisation of the sugar industry?
Multi-product biorefineries from lignocelluloses: a pathway to revitalisation of the sugar industry?
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DOI：
10.1186/s13068-017-0761-9
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发表时间：
2017
影响因子：
6.3
通讯作者：
Görgens JF
中科院分区：
文献类型：
--
作者：
Farzad S;Mandegari MA;Guo M;Haigh KF;Shah N;Görgens JF
在气候变化、资源枯竭和人口增长等一系列可持续挑战的推动下，循环生物经济正在形成，预计将在未来几十年逐步演变。南非与其他金砖国家(巴西、俄罗斯、印度和中国)一起代表着新兴的生物经济，对全球食糖市场做出了重要贡献。在我们的研究中，我们以南非为例，展示了现有制糖业附属的未来生物精炼厂的可持续设计。在一个能源自给自足的生物精炼系统中，应用详细的技术经济评价和生命周期评估(LCA)来模拟将甘蔗残渣(甘蔗渣和垃圾)转化为选定的生物燃料和/或生物化学品(乙醇、乙醇和乳酸、乙醇和呋喃、丁醇、甲醇和费托合成，并联合生产剩余电力)的替代路线。经济评估表明，甲醇合成的内部收益率(IRR)为16.7%，乙醇-乳酸联产(20.5%)满足15%的最低投资标准，而后者对市场价格的敏感度在所有情景中最低。生命周期评价结果表明，甘蔗种植对所有情景的环境影响都是最重要的贡献，但在呋喃生产情景中，关键步骤--使用四氢呋喃溶剂的两相流程--的贡献最大。总体而言，除了酸化和富营养化之外，在大多数影响类别上，热化学途径都比生化途径具有环境优势。在所调查的情景中，糠醛生产的环境性能较差，而甲醇生产的表现最好，因为其试剂消耗较低。综合技术经济和环境评估确定了甘蔗行业2G生物炼油厂设计中的性能限制步骤，并强调了循环生物经济背景下的技术发展机会。这篇文章的在线版本(doi：10.1186/s13068-0170761-9)包含补充材料，授权用户可以使用。
Driven by a range of sustainability challenges, e.g. climate change, resource depletion and expanding populations, a circular bioeconomy is emerging and expected to evolve progressively in the coming decades. South Africa along with other BRICS countries (Brazil, Russia, India and China) represents the emerging bioeconomy and contributes significantly to global sugar market. In our research, South Africa is used as a case study to demonstrate the sustainable design for the future biorefineries annexed to existing sugar industry. Detailed techno-economic evaluation and Life Cycle Assessment (LCA) were applied to model alternative routes for converting sugarcane residues (bagasse and trash) to selected biofuel and/or biochemicals (ethanol, ethanol and lactic acid, ethanol and furfural, butanol, methanol and Fischer–Tropsch synthesis, with co-production of surplus electricity) in an energy self-sufficient biorefinery system. Economic assessment indicated that methanol synthesis with an internal rate of return (IRR) of 16.7% and ethanol–lactic acid co-production (20.5%) met the minimum investment criteria of 15%, while the latter had the lowest sensitivity to market price amongst all the scenarios. LCA results demonstrated that sugarcane cultivation was the most significant contributor to environmental impacts in all of the scenarios, other than the furfural production scenario in which a key step, a biphasic process with tetrahydrofuran solvent, had the most significant contribution. Overall, the thermochemical routes presented environmental advantages over biochemical pathways on most of the impact categories, except for acidification and eutrophication. Of the investigated scenarios, furfural production delivered the inferior environmental performance, while methanol production performed best due to its low reagent consumption. The combined techno-economic and environmental assessments identified the performance-limiting steps in the 2G biorefinery design for sugarcane industry and highlighted the technology development opportunities under circular bioeconomy context. The online version of this article (doi:10.1186/s13068-017-0761-9) contains supplementary material, which is available to authorised users.