Improving microalgal growth with reduced diameters of aeration bubbles and enhanced mass transfer of solution in an oscillating flow field
Improving microalgal growth with reduced diameters of aeration bubbles and enhanced mass transfer of solution in an oscillating flow field
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通过减小曝气气泡直径并增强振荡流场中溶液的传质来改善微藻生长
DOI：
10.1016/j.biortech.2016.03.127
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发表时间：
2016
影响因子：
11.4
通讯作者：
Cen Kefa
中科院分区：
文献类型：
--
作者：
Yang Zongbo;Cheng Jun;Lin Richen;Zhou Junhu;Cen Kefa
提出了一种新型的振荡曝气器和振荡挡板相结合的方法，以产生较小的曝气气泡和强化溶液传质，从而促进回旋流池塘中微藻的生长。采用高速摄影系统(HSP)测量气泡直径和生成时间，在线精密溶氧探头和pH探头测量传质系数和混合时间。在振荡曝气器中，气泡直径和生成时间随着曝气量的减小、孔口直径的减小和水流速度的增大而减小。优化后的振荡气体曝气器与卧式管式气体曝气器相比，气泡直径和生成时间分别减少了25%和58%。在回旋流池塘中采用振荡曝气器和振荡挡板，溶液传质系数提高15%，混合时间缩短32%，微藻生物量产量提高19%。
A novel oscillating gas aerator combined with an oscillating baffle was proposed to generate smaller aeration bubbles and enhance solution mass transfer, which can improve microalgal growth in a raceway pond. A high-speed photography system (HSP) was used to measure bubble diameter and generation time, and online precise dissolved oxygen probes and pH probes were used to measure mass-transfer coefficient and mixing time. Bubble diameter and generation time decreased with decreased aeration gas rate, decreased orifice diameter, and increased water velocity in the oscillating gas aerator. The optimized oscillating gas aerator decreased bubble diameter and generation time by 25% and 58%, respectively, compared with a horizontal tubular gas aerator. Using an oscillating gas aerator and an oscillating baffle in a raceway pond increased the solution mass-transfer coefficient by 15% and decreased mixing time by 32%; consequently, microalgal biomass yield increased by 19%.