Title: Ability of a mutant strain of the microalga Chlorella sp to capture carbon dioxide for biogas upgrading
Authors: Kao, Chien-Ya
Chiu, Sheng-Yi
Huang, Tzu-Ting
Dai, Le
Hsu, Ling-Kang
Lin, Chih-Sheng
生物科技學系
Department of Biological Science and Technology
Keywords: Biogas;Carbon dioxide;Chlorella;Methane;Microalga;Photobioreactor
Issue Date: 1-May-2012
Abstract: 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 < 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. (C) 2012 Elsevier Ltd. All rights reserved.
URI: http://hdl.handle.net/11536/15991
ISSN: 0306-2619
Journal: APPLIED ENERGY
Volume: 93
Issue: 
End Page: 176
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