Ability of a mutant strain of the microalga Chlorella sp. to capture carbon dioxide for biogas upgrading

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• 作者：Chien-Ya Kao ; Sheng-Yi Chiu ; Tzu-Ting Huang ; Le Dai ; Ling-Kang Hsu ; Chih-Sheng Lin ; ^{lincs@mail.nctu.edu.tw}
• 关键词：Biogas ; Carbon dioxide ; Chlorella ; Methane ; Microalga ; Photobioreactor
• 刊名：Applied Energy
• 出版年：2012
• 期刊代码：2_03062619
• 类别：pw
• 出版时间：May, 2012
• 卷：93
• 期：Complete
• 页码：176-183
• 文件大小：827 K

摘要

In this study, a culture system with outdoor microalgae-incorporating photobioreactors was utilized to upgrade biogas produced from the anaerobic digestion of swine wastewater. Using ethyl methane sulfonate (EMS) random mutagenesis, we isolated a mutant strain of microalga, Chlorella sp. MB-9, which was tolerant to high CH₄ and CO₂. In the field study of outdoor operation, the maximum growth rates of Chlorella sp. MB-9 aerated with desulfurized biogas at 0.05, 0.1, 0.2 and 0.3 vvm were 0.32, 0.311, 0.275 and 0.251 g L^鈭? d^鈭?. In addition, 鈭?0%of the CO₂ in desulfurized biogas (鈭?0%CO₂, 鈭?0%CH₄, and H₂S < 50 ppm) could be captured by the Chlorella sp. MB-9 cultures. The CH₄ concentration in the effluent biogas from the Chlorella cultures increased from its original 70%up to 85-90%. The established outdoor microalgae-incorporating culture system with a gas cycle-switching operation could be efficiently used as a CO₂ capture model for biogas upgrading.