Physiology limits commercially viable photoautotrophic production of microalgal biofuels.
Physiology limits commercially viable photoautotrophic production of microalgal biofuels.
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DOI：
10.1007/s10811-017-1214-3
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发表时间：
2017
影响因子：
3.3
通讯作者：
Flynn KJ
中科院分区：
文献类型：
--
作者：
Kenny P;Flynn KJ
藻类生物燃料已被作为化石燃料的替代品，基于微藻可以提供高产化合物来源作为可持续运输燃料的原料的说法。生命周期分析将藻类生产力确定为影响商业和环境可行性的关键因素。在这里，我们使用驱动微藻生长的生物过程的机械模型来探索工业环境中的最佳生产方案，使我们能够量化藻类生物燃料潜力的限制。我们展示了生理和操作权衡如何结合起来，将开放池塘中太阳能藻类生物柴油生产的潜力限制在大约上限。 8000 L ha−1 年−1。对于工业规模的操作，实际考虑将产量限制在大约。 6000 L ha−1 年−1。根据已发表的经济模型和生命周期分析，这样的生产率无法支持专门作为生物燃料原料的天然微藻菌株的太阳能培养的长期可行的商业化。微藻生物燃料的商业可行性主要取决于微藻生理学的限制（主要是碳固定速率）；我们讨论了解决这一瓶颈的范围，得出的结论是，即使部署具有根本增强特性的转基因微藻，也会留下非常重大的后勤负担，甚至财务负担。本文的在线版本 (doi:10.1007/s10811-017-1214-3) 包含补充材料，可供授权用户使用。
Algal biofuels have been offered as an alternative to fossil fuels, based on claims that microalgae can provide a highly productive source of compounds as feedstocks for sustainable transport fuels. Life cycle analyses identify algal productivity as a critical factor affecting commercial and environmental viability. Here, we use mechanistic modelling of the biological processes driving microalgal growth to explore optimal production scenarios in an industrial setting, enabling us to quantify limits to algal biofuels potential. We demonstrate how physiological and operational trade-offs combine to restrict the potential for solar-powered algal-biodiesel production in open ponds to a ceiling of ca. 8000 L ha−1 year−1. For industrial-scale operations, practical considerations limit production to ca. 6000 L ha−1 year−1. According to published economic models and life cycle analyses, such production rates cannot support long-term viable commercialisation of solar-powered cultivation of natural microalgae strains exclusively as feedstock for biofuels. The commercial viability of microalgal biofuels depends critically upon limitations in microalgal physiology (primarily in rates of C-fixation); we discuss the scope for addressing this bottleneck concluding that even deployment of genetically modified microalgae with radically enhanced characteristics would leave a very significant logistical if not financial burden. The online version of this article (doi:10.1007/s10811-017-1214-3) contains supplementary material, which is available to authorized users.
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