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KMID : 1094720160210030422
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Biotechnology and Bioprocess Engineering
2016 Volume.21 No. 3 p.422 ~ p.429
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Enhanced autotrophic growth of Nannochloris sp. with trona buffer for sustainable carbon recycle
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Kim Jin-Soo
Lee Joo-Youp
Lu Ting
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Abstract
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In this study, a potential applicability of a modified Shuisheng-4 culture medium with trona buffer for CO2(g) capture and the resultant CO2-rich solution was investigated for the autotrophic growth of Nannochloris sp. Trona is an inexpensive naturally-occurring mineral with high solubility in water. Trona solution after absorbing CO2(g) controlled at pH ~7 ~ 8 contains high dissolved inorganic carbon (DIC) concentration in water applicable to both open and closed systems and the pH is suitable for the growth. High DIC concentration was also found to enhance the autotrophic growth rate when the Na+ concentration is ~ < 0.12 M. However, the tolerance of a marine green alga, Nannochloris sp., to Na+ ion was found to twice as much as that of a freshwater green alga, Chlorella vulgaris. Therefore, it is anticipated that trona buffer solution has potential for better CO2 utilization for the mutual benefit of microalgae-derived biofuels production and carbon recycle.
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KEYWORD
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Trona, CO2 absorption, autotrophic microalgae growth, Nannochloris sp.
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