State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
Bioresour Technol. 2019 Mar;276:28-34. doi: 10.1016/j.biortech.2018.12.090. Epub 2018 Dec 26.
A novel microporous fibrous-diaphragm aerator (FDA) was proposed to generate pressurized gas with check valve to penetrate through millions of micropores (6-126 μm) of expanded fibrous diaphragm on internal support, thus decreasing bubble generation diameter and increasing bubble residence time for improving microalgal growth with CO fixation in a raceway pond. When installation angle of FDA internal support increased from 0° to 45°, bubble generation time and diameter first decreased (to valley bottoms of 4 ms and 0.45 mm at 22°) and then increased. Compared to traditional strip aerator, bubble generation time and diameter decreased by 50% and 60% through FDA with support installation angle of 22° and average pore diameter of 28 µm, while gas-solution mixing time decreased by 22% and mass transfer coefficient increased by 40%, leading to increased actual photochemical efficiency (by 80%) and increased biomass yield (by 38.5%) of Arthrospira cells with pure CO aeration through FDA.
一种新型微孔纤维隔膜曝气器（FDA）被提出，利用止回阀产生加压气体，使其穿透内部支撑上扩展纤维隔膜的数百万个微孔（6-126μm），从而减小气泡生成直径并增加气泡停留时间，以提高跑道池中的微藻生长和 CO2 固定。当 FDA 内部支撑的安装角度从 0°增加到 45°时，气泡生成时间和直径先减小（在 22°时达到 4ms 和 0.45mm 的谷值），然后再增加。与传统的条带曝气器相比，通过安装角度为 22°和平均孔径为 28μm 的 FDA，气泡生成时间和直径分别减少了 50%和 60%，而气-液混合时间减少了 22%，传质系数增加了 40%，导致纯 CO2 曝气通过 FDA 的节旋藻实际光化学效率（提高了 80%）和生物量产量（提高了 38.5%）增加。
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