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首页> 外文会议>International Tropical Renewable Energy Conference >Effects of the light intensity and the reactor geometry on the microalgae yield in a bubble-column photobioreactor
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Effects of the light intensity and the reactor geometry on the microalgae yield in a bubble-column photobioreactor

机译：光强度与反应器几何形状对泡柱光生物反应器中微藻产量的影响

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摘要

Microalgae cultivation is a light-demanding process. Optimal growth of microalgae takes place in appropriate reactors. In this research the effects of the light intensity and the reactor geometry on the yield of microalgae Nannochloropsis salina in an internally-illuminated bubble-column photobioreactor was investigated. An axisymmetric two-dimensional phenomenological model of the reactor comprising gas-phase and liquid-phase mass balances was utilized. Axial and radial dispersion correlations in gas and liquid phases were applied on the description of the non-ideal flows in the reactor. The model was validated against the experimental data obtained in a reactor with 0.1 m in the diameter of the smaller cylinder, 0.197 m in the diameter of the larger cylinder, 0.8 m in the culture height, and being fed by a gas of 2% CO_2-air ratio with the flow rate being 800 mL/min for 15 days. The validation result shows that the model can reproduce well the experimental results with 5% error. The microalgae yield produced in the reactor with the diameter of the larger cylinder of 0.197 m is 0.52 g/L. It decreases when the diameter of the larger cylinder enlarges. Increasing the intensity up to 22.5 W/m~2 raises the microalgae production. However, increasing the intensity beyond that value reduces the microalgae production.
机译：微藻培养是一种轻苛刻的过程。微藻的最佳生长在适当的反应器中进行。在这项研究中，研究了光强度和反应器几何形状对内部照射气泡柱光生物反应器中微藻Nannochloropsis Salina的产量的影响。利用包含气相和液相质量余量的反应器的轴对称二维现象模型。在反应器中非理想流的描述上施加气体和液相中的轴向和径向分散相关。该模型针对在较小圆柱体直径的反应器中获得的实验数据验证，较大圆柱直径为0.197μm，培养物高0.8μm，并通过2％CO_2的气体供给。 -AILAIL比率为800ml / min 15天。验证结果表明，该模型可以恢复良好的实验结果5％误差。在反应器中产生的微藻产率，其直径为0.197μm为0.52g /升。当较大的圆柱体的直径放大时，它减少。增加高达22.5的强度，提高了微藻生产。然而，增加超出该值的强度减少了微藻生产。

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