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

Chien-Ya Kao, Sheng-Yi Chiu, Tzu-Ting Huang, Le Dai, Ling-Kang Hsu and Chih-Sheng Lin

Applied Energy, 2012, vol. 93, issue C, 176-183

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 0.3vvm were 0.32, 0.311, 0.275 and 0.251gL−1d−1. In addition, ∼70% of the CO2 in desulfurized biogas (∼20% CO2, ∼70% CH4, and H2S<50ppm) 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.

Keywords: Biogas; Carbon dioxide; Chlorella; Methane; Microalga; Photobioreactor (search for similar items in EconPapers)
Date: 2012
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Citations: View citations in EconPapers (17)

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DOI: 10.1016/j.apenergy.2011.12.082

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