title: Biocapture of CO2 from biogas by oleaginous microalgae for improving methane content and simultaneously producing lipid.
abstract: This study aimed to use oleaginous microalgae to capture CO2 from biogas for improving methane content and simultaneously producing lipid. Several microalgae were screened for their ability to grow and produce lipid using CO2 in biogas. A marine Chlorella sp. was the most suitable strain for capturing CO2 and producing lipid using biogas (50% v/v CO2 in methane) as well as using 50% v/v CO2 in air. The medium and operating conditions were optimized through response surface methodology (RSM). The optimal concentrations of KNO3 and K2HPO4 were 0.80gL(-1) and 0.06gL(-1), respectively. The optimal operating conditions were: initial pH of 7.8, initial cell concentration of 10(7.5)cellsmL(-1), light intensity of 4500lux and gas flow rate of 0.03Lmin(-1). After optimization, 89.3% of CO2 was removed from biogas and the methane content was increased up to 94.7%. The lipid productivity was 94.7mgL(-1)day(-1).
authors.affiliation: Department of Industrial Biotechnology, Faculty of Agro-Industry, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand.
authors.forename: Wassa
authors.initials: W
authors.lastname: Tongprawhan
authors.affiliation: Department of Industrial Biotechnology, Faculty of Agro-Industry, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand.
authors.forename: Sirasit
authors.initials: S
authors.lastname: Srinuanpan
authors.affiliation: Department of Industrial Biotechnology, Faculty of Agro-Industry, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand. Electronic address: benjamas.che@psu.ac.th.
authors.forename: Benjamas
authors.initials: B
authors.lastname: Cheirsilp
mesh_terms: D001673:Biodegradation, Environmental; D056804:Biofuels / Q000032:analysis*; D019149:Bioreactors; D002245:Carbon Dioxide / Q000378:metabolism*; D002708:Chlorella / Q000378:metabolism*; D002849:Chromatography, Gas; D006863:Hydrogen-Ion Concentration; D008055:Lipids / Q000302:isolation & purification; D008697:Methane / Q000032:analysis*; D058086:Microalgae / Q000378:metabolism*; D013053:Spectrophotometry
chemical_list: D056804:Biofuels; D008055:Lipids; D002245:Carbon Dioxide; D008697:Methane
keywords: Biogas; CO(2) capture; Lipid; Methane; Oleaginous microalgae