Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China; Institute of Engineering Thermophysics, 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, Chongqing University, Chongqing 400044, China.
Bioresour Technol. 2017 Jun;233:84-91. doi: 10.1016/j.biortech.2017.02.071. Epub 2017 Feb 20.
Dynamic behavior of bubbles would significantly affect CO mass transfer and may cause microalgae cells uneven distribution due to the bubble carrying effect. To improve microalgae growth, the gas distributor and aeration conditions was optimized according to the bubble rising behavior. The CO bubble rising trajectory is similar to a Zigzag. The amplitude and wavelength of the Zigzag, which reflected the influenced zone of microalgae suspension in horizontal direction and disturbance intensity on culture, respectively, was controlled by the structure of gas distributor and aeration conditions. An optimized round gas distributor that full of holes with an inner diameter of 0.5mm and spacing of 1.5mm was designed. When cultivated with the optimized gas distributor aerating 5% CO gas at 0.250vvm, the maximum biomass concentration of Chlorella pyrenoidosa achieved 2.88gL, increased by 83.44% compared to that of 1.57gLcultivated with the commercial micro-bubbles aerator.
气泡的动态行为会显著影响 CO 的传质，并且由于气泡携带作用可能导致微藻细胞分布不均匀。为了提高微藻的生长，根据气泡上升行为对气体分布器和曝气条件进行了优化。CO 气泡的上升轨迹类似于之字形。之字形的幅度和波长分别反映了微藻悬浮液在水平方向上的影响区域和对培养的干扰强度，这是由气体分布器的结构和曝气条件控制的。设计了一种充满内直径为 0.5mm 且间距为 1.5mm 的孔的优化圆形气体分布器。当使用优化的气体分布器以 0.250vvm 的速率曝气 5%CO 气体进行培养时，与使用商业微气泡曝气器培养时的 1.57gL 相比，Chlorella pyrenoidosa 的最大生物量浓度达到了 2.88gL，增加了 83.44%。
