Investigation of the Effect of Solar Irradiation and Temperature on H. pluvialis Production in Photobioreactors Under Outdoor Cultivation in Sri Lanka

2021 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2021-07-27 DOI:10.1109/MERCon52712.2021.9525672

M.A.T.C . Perera, Kasun Muthunayaka, D. Madushanka, V. C. Liyanaarachchi, M. Premaratne, T. Ariyadasa

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Abstract

The complicated and varying weather conditions and contamination from fungi, protozoa, and bacteria are major problems associated with outdoor microalgae cultivation. In this study, outdoor microalgae cultivation was investigated in a 3.2 L vertical tubular photobioreactor in Moratuwa, Sri Lanka. During December, when both the solar irradiation and temperature were high, the water spray system in combination with two agro shading nets (each with a shading rate of 40-50%) could effectively reduce the temperature to $2 \pm 2\ {}^{0}\mathrm{C}$ and control solar irradiation below 13500 lux. Under an initial biomass density of 0.2875 g/L and an atmospheric air flow rate of 1 vvm, Haematococcus pluvialis showcased a maximum biomass accumulation of 0.45 g/L and the maximum productivity of 20 mg/L/day. In addition, the reactor system and its design exhibited good performance, implying a potential scale-up opportunity. However, operation under outdoor conditions showed slightly poorer performance due to the light inhibition effect.

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太阳辐照和温度对斯里兰卡室外栽培光生物反应器中雨芽孢菌生产影响的研究

复杂多变的天气条件以及真菌、原生动物和细菌的污染是室外微藻培养的主要问题。本研究在斯里兰卡Moratuwa的3.2 L立式管状光生物反应器中进行了室外微藻培养研究。在12月太阳照射和温度均较高的情况下，水雾系统配合2张遮阳网(遮阳率40-50%)可有效地将温度降低到$2 \pm 2\ {}}^{0}\mathrm{C}$，并将太阳照射量控制在13500 lux以下。在初始生物量密度为0.2875 g/L、大气空气流速为1 vvm的条件下，雨红球菌的最大生物量积累量为0.45 g/L，最大产量为20 mg/L/d。此外，反应器系统及其设计表现出良好的性能，这意味着潜在的扩大机会。然而，由于光抑制效应，在室外条件下的操作性能略差。

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2021 Moratuwa Engineering Research Conference (MERCon)

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