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Effects of Nitrogen Supplementation Status on CO2 Biofixation and Biofuel Production of the Promising Microalga Chlorella sp. ABC-001.
Journal of Microbiology and Biotechnology ( IF 2.5 ) Pub Date : 2020-8-29 , DOI: 10.4014/jmb.2005.05039
Jun Muk Cho 1 , You-Kwan Oh 2 , Won-Kun Park 3 , Yong Keun Chang 1, 4
Affiliation  

The use of microalgal biomass as feedstock for biofuels has been discussed for decades as it provides a sustainable approach to producing fuels for the future. Nonetheless, its feasibility has not been established yet and various aspects of biomass applications such as CO2 biofixation should also be explored. Therefore, in this study, the CO2 biofixation and lipid/carbohydrate production potential of Chlorella sp. ABC-001 were examined under various nitrogen concentrations. The highest biomass productivity and CO2 biofixation rate of 0.422 g/l/d and 0.683 g/l/d, respectively, were achieved under a nitrogen-rich condition (15 mM nitrate). Carbohydrate content was generally proportional to initial nitrate concentration and showed the highest value of 41.5% with 15 mM. However, lipid content showed an inverse relationship with nitrogen supplementation and showed the highest value of 47.4% with 2.5 mM. In consideration as feedstock for biofuels (bioethanol, biodiesel, and biogas), the sum of carbohydrate and lipid contents were examined and the highest value of 79.6% was achieved under low nitrogen condition (2.5 mM). For lipid-based biofuel production, low nitrogen supplementation should be pursued. However, considering the lower feasibility of biodiesel, pursuing CO2 biofixation and the production of carbohydrate-based fuels under nitrogenrich condition might be more rational. Thus, nitrogen status as a cultivation strategy must be optimized according to the objective, and this was confirmed with the promising alga Chlorella sp. ABC-001.

中文翻译:

氮补充状态对有前途的微藻小球藻 CO2 生物固定和生物燃料生产的影响。ABC-001。

几十年来,人们一直在讨论使用微藻生物质作为生物燃料的原料,因为它为未来生产燃料提供了一种可持续的方法。尽管如此,其可行性尚未确定,还应探索生物质应用的各个方面,例如 CO 2生物固定。因此,在这项研究中,小球藻的 CO 2生物固定和脂质/碳水化合物生产潜力。在各种氮浓度下对 ABC-001 进行了检查。最高的生物质生产率和 CO 2在富氮条件(15 mM 硝酸盐)下,生物固定率分别达到 0.422 g/l/d 和 0.683 g/l/d。碳水化合物含量通常与初始硝酸盐浓度成正比,在 15 mM 时最高值为 41.5%。然而,脂质含量与氮的补充呈反比关系,最高值为 47.4%,为 2.5 mM。考虑作为生物燃料(生物乙醇、生物柴油和沼气)的原料,检查了碳水化合物和脂质含量的总和,在低氮条件下(2.5 mM)达到了 79.6% 的最高值。对于基于脂质的生物燃料生产,应追求低氮补充。但考虑到生物柴油可行性较低,追求CO 2在富氮条件下进行生物固定和生产碳水化合物燃料可能更为合理。因此,作为栽培策略的氮状态必须根据目标进行优化,这一点在有前途的藻类小球藻中得到了证实。ABC-001。
更新日期:2020-08-30
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