气升式光生物反应器中Chlorella sp.优化培养与能量计算

Optimization of Chlorella sp. cultivation in airlift photobioreactor and energy calculation

摘要:

高油脂含量的微藻能够有效利用太阳能生产生物油脂,从而实现无机碳转化为有机碳的过程．如何降低微藻培养过程的能量消耗,是实现含油微藻规模化生产生物柴油的关键．通过对气升式光生物反应器中Chlorella sp.培养条件的优化,以及不同培养条件的能量计算和比较,发现当使用侧光光纤作为内置光源时可以提高光能利用率,在适宜的通气速率(0.6 L／min)条件下,可获得单位能耗的最大生物产量4.40 g／(W·d),较同等条件下外置光源时产量提高了8～25倍．

Abstract:

Oleaginous microalgae can produce biodiesel by solar energy, transforming the inorganic carbon into organic carbon. However, the reduction of the energy consumption in the process of oleaginous microalgae cultivation is the bottleneck to achieve large-scale production of biodiesel. By the optimization of the Chlorella sp. cultivation in an airlift photobioreactor, as well as the energy calculation and comparison of different culture conditions, the work proposed that, the adoption of optical fibers as the internal illumination source and a proper flow rate (0.6 L／min) in the cultivation of Chlorella sp. in the airlift photobioreactor could enhance the energy efficiency and obtain the maximal productivity per energy consumption 4.40 g／(W·d), 8-25 folds of those with the external illumination conditions.