Production de microalgues à partir de carbone résiduel pour une implantation dans la bioraffinerie de 2e génération

微藻生产和第二代生物炼制厂植入的碳残渣部分

• 批准号: 535877-2018
• 负责人: Lavoie, JeanMichel
• 金额: $ 3.17万
• 依托单位: Université de Sherbrooke
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=688749
• 关键词: Production; de; microalgues; partir; carbone

The cellulosic ethanol production process requires not only fermentable sugars but also complementary micro- and macro-nutrients which will aid the uptake of these carbohydrates and their conversion to ethanol by the involved yeast. However, the lignocellulosic biomass generally lacs these compounds and thus requires the addition of nutrient mixtures such as yeast extract or complementary nitrogen and mineral sources for the efficient fermentation of the cellulosic carbohydrates. Furthermore, the lignocellulosic sugar streams will generate a new type of residue which will become a challenge for the valorization chain of the current first generation ethanol industry (grains and solubles). A complementary nutrient addition through microalgal biomass for instance could bring value to the process, making thus the second generation ethanol more competitive with respect to the first generation. Besides these realities, the first generation ethanol production process generates significant anthropogenic CO2, especially in Canada where heating requirements are important. These CO2 emissions significantly impact thus the carbon balance of the first and eventually second generation ethanol production processes. In the same time however, this CO2 represents a valuable carbon source which could potentially be converted, especially by autotrophic microalgae, to biomass. The alcoholic fermentation process generates a protein-rich sidestream with low added value, the backset, which could be used as cultivation media for these microalgae. Thus, the present project aims to transform two of the most important constraints faced by the ethanol industry into an opportunity by utilizing the effluents generated by the first generation ethanol production process to support the implementation of second generation ethanol technologies while simultaneously reducing their CO2 footprint.

纤维素乙醇生产过程不仅需要可发酵的糖，而且还需要补充微量和大量营养素，这将有助于这些碳水化合物的吸收及其通过所涉及的酵母转化为乙醇。然而，木质纤维素生物质通常含有拉克这些化合物，因此需要添加营养混合物如酵母提取物或补充氮和矿物质源以有效发酵纤维素碳水化合物。此外，木质纤维素糖流将产生一种新型的残留物，这将成为目前第一代乙醇工业（谷物和可溶物）的价值链的挑战。例如，通过微藻生物质补充营养素可以为该过程带来价值，从而使第二代乙醇相对于第一代乙醇更具竞争力。除了这些现实，第一代乙醇生产过程产生大量的人为二氧化碳，特别是在加拿大，加热要求很重要。因此，这些CO2排放显著影响第一代和最终第二代乙醇生产过程的碳平衡。然而，与此同时，这种CO2代表了一种有价值的碳源，其可以潜在地转化为生物质，特别是通过自养微藻。酒精发酵过程产生了一种富含蛋白质的侧流，其附加值低，即回流，可用作这些微藻的培养基。因此，本项目旨在通过利用第一代乙醇生产过程产生的废水来支持第二代乙醇技术的实施，同时减少其二氧化碳足迹，从而将乙醇工业面临的两个最重要的制约因素转化为机遇。