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首页> 外文期刊>Bioprocess and Biosystems Engineering >Optimal design of scalable photo-bioreactor for phototropic culturing of Haematococcus pluvialis
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Optimal design of scalable photo-bioreactor for phototropic culturing of Haematococcus pluvialis

机译：雨生红球菌光性培养用可扩展光生物反应器的优化设计

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The unicellular green microalgae, Haematococcus pluvialis, has been examined as a microbial source for the production of astaxanthin, which has been suggested as a food supplement for humans and is also prescribed as an ingredient in eye drops because of its powerful anti-oxidant properties. In this study, we estimated the effects of the slope of a V-shaped bottom design, the volumetric flow rate of air, height/diameter (H/D) ratio, and diameter of an air sparger on the performance of a photo-bioreactor. These parameters were selected because they are recognized as important factors effecting the mixing that produces increased cell density in the reactor. The mixing effect can be measured by changes in optical density in the bioreactor over a period of time. A 6 L indoor photo-bioreactor was prepared in a short time period of 24 h for the performance study. A bioreactor designed with a V-shaped bottom with a slope of 60° showed an optical density change of 0.052 at 680 nm, which was sixfold less than the change in a photo-bioreactor designed with a flat bottom. Studies exploring the effects of bioreactor configuration and a porous metal sparger with a 10 μm pore size showed the best performance at an H/D ratio of 6:1 and a sparger diameter of 1.3 cm, respectively. The optimal rate of air flow was 0.2 vvm. The indoor culture of microalgae in the photo-bioreactor was subsequently carried for an application study using the optimal values established for the important factors. The indoor culture system was composed of a light source controlled according to cell phase, a carbon dioxide feeder, a bag-type reactor with an H/D ratio of 6:1, and a temperature controller. Results demonstrated the efficient production of microalgal cells and astaxanthin in the amounts of 2.62 g/L and 78.37 mg/L, respectively, when using adequate hydrodynamic mixing. Furthermore, the optimal design of a photo-bioreactor can be applied for the phototropic culturing of other microalgae for mass production.
机译：单细胞绿色微藻（Haematococcus pluvialis）已被作为生产虾青素的微生物来源进行了研究，虾青素已被建议作为人类的食品补充剂，并且由于其强大的抗氧化特性也被指定为滴眼剂的一种成分。在这项研究中，我们估计了V型底部设计的斜率，空气的体积流量，高度/直径（H / D）比率以及空气喷射器的直径对光生物反应器性能的影响。 。选择这些参数是因为它们被认为是影响混合的重要因素，从而在反应器中产生增加的细胞密度。混合效果可以通过一段时间内生物反应器中光密度的变化来测量。在24小时内准备了6 L室内光生物反应器进行性能研究。设计为具有60°斜率的V形底部的生物反应器在680 nm处显示的光密度变化为0.052，这比设计为平底的光生物反应器的变化小六倍。探索生物反应器配置和孔径为10μm的多孔金属喷雾器的研究表明，在H / D比为6：1和喷雾器直径为1.3 cm时，性能最佳。最佳气流速率为0.2 vvm。随后使用针对重要因素确定的最佳值，在光生物反应器中进行微藻的室内培养，以进行应用研究。室内培养系统由根据细胞相控制的光源，二氧化碳进料器，H / D比为6：1的袋式反应器和温度控制器组成。结果表明，在使用适当的流体动力混合时，微藻细胞和虾青素的有效产量分别为2.62 g / L和78.37 mg / L。此外，可以将光生物反应器的最佳设计用于其他微藻的光致培养，以进行批量生产。

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