流动条件下小球藻生长特性的实验研究

Experimental investigation on growth profiles of microalgae with different flow conditions in photo-bioreactors

摘要: 高密度藻培对藻类资源高效利用十分重要。为解决流动条件对微藻生长作用机理不明的问题，本文借助高时间分辨率粒子图像测速技术（Time Resolved Particle Image Velocimeter, TR-PIV），对比研究光生物反应器(Photobioreactors, PBR)的水流速度分布特征和涡流效应，获得了藻液流速、涡量、湍流动能（TKE）云图，测量了小球藻的生长速率和类胡萝卜素含量。实验结果表明：高轴向速度、高径向速度、高涡量（0.015 s⁻¹≤Ω≥0.025 s⁻¹）、高TKE(k≤0.2 m²/s²)的流动会加速小球藻细胞的分裂、生长及高附加值产物产生；流场可视化方法是PBR设计与优化的一种有效工具。

Abstract: Well-designed Photo-bioreactors (PBR) support high-efficiency biomass production. Methods: Flow fields of plat-plate PBR are experimental investigated with a time-resolved particle image velocimeter (TR-PIV). Results: Microalgae flow around sets of baffles improves performance of Chlorella vulgaris growth. Conclusion: The PIV-based flow visualization method benefits microalgae PBR designs, implements of high-density cultivations. The PBR structures proposed in this paper is of great supports to design and high productivity of bio-products with high added-values.