Sun Yahui, Hu Deshen, Chang Haixing, Li Shengnan, Ho Shih-Hsin
School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210023, China; Hebei Provincial Lab of Water Environmental Sciences, Hebei Provincial Academy of Ecological and Environmental Sciences, Shijiazhuang 050037, China.
School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210023, China.
Bioresour Technol. 2022 Nov;363:127991. doi: 10.1016/j.biortech.2022.127991. Epub 2022 Sep 20.
Inhomogeneous light distribution and poor CO transfer capacity are two critical concerns impeding microalgal photosynthesis in practical suspended photobioreactors (PBRs). To provide valuable guidance on designing high-performance PBRs, recent progress on enhancing light and CO availabilities is systematically summarized in this review. Particularly, for the first time, the strategies on elevating light availability are classified and discussed from the perspectives of increasing incident light intensity, introducing internal illumination, optimizing flow field, regulating biomass concentrations, and enlarging illumination surface areas. Meanwhile, the strategies on enhancing CO light availability are outlined from the aspects of generating smaller bubbles, extending bubbles residence time, and facilitating CO dissolution using extra additives. Given the microalgal biomass production using current PBRs are still suffering from low productivity and economic feasibility, the possible future directions for PBRs implementation and development are presented. Altogether, this review is beneficial to furthering development of PBRs as a practical technology.
光分布不均匀和二氧化碳传递能力差是阻碍实际悬浮式光生物反应器（PBR）中微藻光合作用的两个关键问题。为了为设计高性能PBR提供有价值的指导，本综述系统总结了提高光和二氧化碳利用率的最新进展。特别是，首次从增加入射光强度、引入内部照明、优化流场、调节生物质浓度和扩大照明表面积等角度对提高光利用率的策略进行了分类和讨论。同时，从产生更小气泡、延长气泡停留时间以及使用额外添加剂促进二氧化碳溶解等方面概述了提高二氧化碳利用率的策略。鉴于目前使用PBR生产微藻生物质仍面临低生产率和经济可行性的问题，提出了PBR实施和发展的未来可能方向。总之，本综述有助于推动PBR作为一种实用技术的进一步发展。
