Growing <scp><i>Chlorella vulgaris</i></scp> on mixed wastewaters for biodiesel feedstock production and nutrient removal

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  • Xiangyuan Deng
    College of Biotechnology Jiangsu University of Science and Technology Zhenjiang People's Republic of China
  • Kun Gao
    College of Biotechnology Jiangsu University of Science and Technology Zhenjiang People's Republic of China
  • Min Addy
    Center for Biorefining and Department of Bioproducts and Biosystems Engineering University of Minnesota St. Paul MN USA
  • Paul Chen
    Center for Biorefining and Department of Bioproducts and Biosystems Engineering University of Minnesota St. Paul MN USA
  • Da Li
    College of Biotechnology Jiangsu University of Science and Technology Zhenjiang People's Republic of China
  • Renchuan Zhang
    Center for Biorefining and Department of Bioproducts and Biosystems Engineering University of Minnesota St. Paul MN USA
  • Qian Lu
    Center for Biorefining and Department of Bioproducts and Biosystems Engineering University of Minnesota St. Paul MN USA
  • Yiwei Ma
    Center for Biorefining and Department of Bioproducts and Biosystems Engineering University of Minnesota St. Paul MN USA
  • Yanling Cheng
    Center for Biorefining and Department of Bioproducts and Biosystems Engineering University of Minnesota St. Paul MN USA
  • Yuhuan Liu
    The Engineering Research Center for Biomass Conversion Nanchang University Nanchang People's Republic of China
  • Roger Ruan
    Center for Biorefining and Department of Bioproducts and Biosystems Engineering University of Minnesota St. Paul MN USA

説明

<jats:title>Abstract</jats:title><jats:sec><jats:title>BACKGROUND</jats:title><jats:p>Large water footprint and nutrients demand are two of the major issues during microalgae cultivation. In this study, anaerobically digested swine manure was mixed with centrate at different minimal dilution multiples (2×, 3×, 4×, 6× and 8×), which was used as media to cultivate <jats:styled-content style="fixed-case"><jats:italic>Chlorella vulgaris</jats:italic></jats:styled-content> (UTEX 2714) for reducing the production cost of algae cultivation and balancing the nutrient profiles of culture media.</jats:p></jats:sec><jats:sec><jats:title>RESULTS</jats:title><jats:p><jats:styled-content style="fixed-case"><jats:italic>Chlorella vulgaris</jats:italic></jats:styled-content> (UTEX 2714) grew well on the mixed wastewaters with a biomass productivity of 132.2 to 440.3 mg L<jats:sup>−1</jats:sup> d<jats:sup>−1</jats:sup>. Nutrients in the mixed wastewaters were removed effectively by this alga, and the removal efficiencies of ammonium (NH<jats:sub>4</jats:sub><jats:sup>+</jats:sup>‐N), total nitrogen (TN), chemical oxygen demand (COD) and total phosphorus (TP) ranged from 98.3, 46.9, 30.2 and 21.8 to 99.3, 71.4, 42.2 and 80.4%, respectively. Additionally, chemical compositions, such as pigments, carbohydrate, protein and lipids, in this alga varied with the change of dilution multiple due to the different nutrient profiles of culture media. Predicted properties of biodiesel from the oils of this alga satisfied the specifications of biodiesel, ASTM D6751‐08 and EN 14214 standards.</jats:p></jats:sec><jats:sec><jats:title>CONCLUSION</jats:title><jats:p>Biomass of <jats:styled-content style="fixed-case"><jats:italic>C. vulgaris</jats:italic></jats:styled-content> (UTEX 2714) can be used as a good‐quality feedstock for biodiesel production when grown on mixed wastewaters. This novel integration of using mixed wastewaters to cultivate microalgae would be an effective way to reduce the production cost of algal biomass. © 2018 Society of Chemical Industry</jats:p></jats:sec>

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