Abstract

This study investigated microalgal CO₂ fixation at the CO₂ concentration ranging from 5 to 40% and the CO₂ loading rate of 14.4 to 57.6 L/L-d. Chlorella sp. (AG10133) was selected as the optimal strain for CO₂ fixation among examined algal strains. The microalgal CO₂ fixation was highly dependent on the CO₂ loading rate as well as CO₂ concentration. In batch culture, the highest CO₂ fixation rate of 1.785 g/L-d was obtained at the CO₂ concentration and the CO₂ loading rate of 15% and 43.2 L/L-d, respectively. The high CO₂ fixation performance was maintained at CO₂ 40% with the same CO₂ loading rate. On the other hand, CO₂ loading rate over 43.2 L/L-d at CO₂ 15% deteriorated CO₂ fixation along with the decrease of microalgal growth. In continuous culture, the CO₂ fixation rate of 2.25 g/L-d was achieved at the pseudo-steady state. The microalgal CO₂ fixation would be suitable for high-strength CO₂ gas stream such as biogas by providing proper CO₂ loading rate.

Graphic Abstract

中文翻译：

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在不同的CO 2曝气条件下微藻菌株的CO 2固定比较评估

摘要

这项研究调查了微藻将CO ₂固定在5至40％的CO ₂浓度和14.4至57.6 L / Ld的CO ₂负载率。小球藻藻。在检测的藻类菌株中，选择（AG10133）作为CO ₂固定的最佳菌株。微藻的CO ₂固定高度依赖于CO _2的负载速率以及CO _2的浓度。在分批培养中，在CO ₂浓度为15％和CO ₂负载率为43.2 L / Ld时，最高的CO ₂固定率达到1.785 g / Ld 。高CO ₂在相同的CO ₂负载率下，固定性能保持在CO ₂ 40％。另一方面，当CO _2为15％时，CO ₂负载率超过43.2 L / Ld，随着微藻类生长的减少，CO ₂固定性变差。在连续培养中，在拟稳态下，CO ₂固定率为2.25 g / Ld。通过提供适当的CO ₂加载速率，微藻类CO ₂固定将适合于高强度的CO ₂气流，例如沼气。

图形摘要