Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China; Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China.
Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China; Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China.
J Biotechnol. 2022 Jun 20;352:26-35. doi: 10.1016/j.jbiotec.2022.05.007. Epub 2022 May 21.
A novel magnet-driven rotary mixing aerator (MDRMA) was proposed to reduce the diameter and rising rate of bubbles while improving CO mass transfer during microalgae growth in a column photobioreactor. Visualization results showed that the bubble number density increased significantly with the increasing rotation rate of MDRMA. As the rotation rate increased from 0 to 300 r min, the average bubble diameter decreased from 3.8 mm to 2.0 mm (47.4% reduction), while the corresponding average bubble rising rate decreased from 0.32 m s to 0.22 m s (31.3% reduction). Notably, when the rotation rate of MDRMA exceeded 300 r min, a significant number of microbubbles with diameters below 0.5 mm were generated. When synthetic flue gas containing 12% CO (v/v) was supplied for microalgae cultivation, a maximum biomass concentration of 1.75 g L was obtained with rotating MDRMA at 200 r min, showing a 57.7% increase compared to the control aerated with a silicone tube aerator. Meanwhile, the pigment content reached 14.48 mg L, 22.7% higher than that of the control.
一种新型磁驱动旋转混合曝气器（MDRMA）被提出，以减小气泡的直径和上升速率，同时提高微藻在柱式光生物反应器生长过程中的 CO 传质。可视化结果表明，随着 MDRMA 转速的增加，气泡数密度显著增加。当 MDRMA 的转速从 0 增加到 300 r min 时，平均气泡直径从 3.8 毫米减小到 2.0 毫米（减少 47.4%），而相应的平均气泡上升速率从 0.32 m s 减小到 0.22 m s（减少 31.3%）。值得注意的是，当 MDRMA 的转速超过 300 r min 时，会产生大量直径小于 0.5 毫米的微小气泡。当用含有 12%CO（体积分数）的合成烟道气为微藻培养供气时，在 200 r min 下用旋转的 MDRMA 获得了 1.75 g L 的最大生物量浓度，与用硅酮管曝气器曝气的对照相比增加了 57.7%。同时，色素含量达到 14.48 mg L，比对照提高了 22.7%。
