利用上下折流挡板的养殖池内气泡破裂提高微藻的 CO2 固定效率。
Improving CO2 fixation with microalgae by bubble breakage in raceway ponds with up-down chute baffles.
机构信息
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
出版信息
Bioresour Technol. 2016 Feb;201:174-81. doi: 10.1016/j.biortech.2015.11.044. Epub 2015 Nov 23.
The aeration gas was broken into smaller bubbles with enhanced local solution velocity to improve CO2 fixation with microalgae in raceway ponds with up-down chute baffles. A high-speed photography system and online precise pH probes were used to measure bubble generation and residence times, which were affected by paddlewheel speed, aerator orifice diameter, gas flow rate, and solution depth. Bubble generation time (from gas reaching aerator orifice surface to completely escaping from the aerator) decreased because of the enhanced local solution velocity, whereas bubble residence time increased because of the vortex flow field produced by up-down chute baffles. Bubble generation time decreased by 27% and bubble residence time increased by 27% when paddlewheel speed was 10r/min with an aeration gas rate of 0.03vvm. The decreased generation time and increased residence time of aeration bubbles promoted microalgae biomass yield by 29% in optimized flow fields in raceway ponds.
曝气机将气体打散成更小的气泡，并提高局部溶液速度，以增强微藻在带有上下折流挡板的环道池塘中的 CO2 固定效果。高速摄影系统和在线精确 pH 探头用于测量气泡的生成和停留时间，这些时间受到桨轮速度、曝气器孔径、气体流量和溶液深度的影响。由于局部溶液速度的提高，气泡生成时间（从气体到达曝气器孔表面到完全从曝气器中逸出）缩短，而由于上下折流挡板产生的涡流流场，气泡停留时间增加。当曝气气体速率为 0.03vvm 时，桨轮速度为 10r/min，气泡生成时间减少了 27%，气泡停留时间增加了 27%。在优化的环道池塘流场中，曝气气泡的生成时间缩短和停留时间延长，使微藻生物量提高了 29%。
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