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| Enhancement of CO2 transfer and carbon fixation by microalgae in photobioreactor |
| HU Zi-Ming1,2,3, XIA Ao1,2, HUANG Yun1,2, LIAO Qiang1,2, FU Qian1,2, ZHU Xun1,2 |
1. Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400030, China;
2. Institute of Engineering Thermophysics, College of Energy and Power Engineering, Chongqing University, Chongqing 400030, China;
3. Southwest Electric Power Design Institute Co., Ltd., Chengdu 610021, China |
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Abstract Gaseous carbon dioxide can provide an essential carbon source during microalgal photosynthesis. Mixing, dissolution and transportation characteristics of carbon dioxide have significant impacts on the growth of microalgae. In a photobioreactor, the behaviors of carbon dioxide bubbles during growth, detachment, coalescence and rising are significantly affected by the gas distributor. In this study, the effects of orifice diameter and spacing of the gas distributor on 15% CO2 bubble behaviors, dissolution and mixing characteristics of carbon dioxide as well as performances of microalgal growth and carbon dioxide fixation have been investigated. The rising velocity of bubble was reduced with decreasing orifice diameter and spacing, thereby increasing the retention time of carbon dioxide in microalgal suspension. As the parameters of gas distributor were optimized, the gas-liquid mass transfer coefficient was improved by 143%, the mixing time was reduced by 24%, the concentration of microalgae was increased by 18.8%, and the carbon dioxide fixation rate was enhanced by 23.2%.
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Received: 27 March 2018
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