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

作者：Kao Chien Ya; Chiu Sheng Yi; Huang Tzu Ting; Dai Le; Hsu Ling Kang; Lin Chih Sheng^*

来源：Applied Energy, 2012, 93: 176-183.

DOI：10.1016/j.apenergy.2011.12.082

• Biogas
• Carbon dioxide
• Chlorella
• Methane
• Microalga
• Photobioreactor

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-1 d(-1). In addition. similar to 70% of the CO2 in desulfurized biogas (similar to 20% CO2. similar to 70% CH4, and H2S %26lt; 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.

• 出版日期2012-5