4.7 Article

Bioprocessing of volatile fatty acids by oleaginous freshwater microalgae and their potential for biofuel and protein production

期刊

CHEMICAL ENGINEERING JOURNAL
卷 438, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.135529

关键词

Microalgae; Auxenochlorella protothecoides; Chlorella sorokiniana; Volatile fatty acids; Biodiesel; Lipids; Fatty acid methyl esters; Protein; Essential amino acids

资金

  1. Swedish Research Council (FORMAS) [2018-00818, 2020-01028]
  2. Kempe Foundation (Sweden) [JCK-1904.2]
  3. Formas [2020-01028] Funding Source: Formas

向作者/读者索取更多资源

This study successfully optimized the growth and lipid synthesis of two microalgae species by using volatile fatty acids (VFAs) as the carbon source, and generated lipids that meet the standards for biodiesel. Additionally, VFAs allowed the microalgae to contain a complete range of amino acids.
To address the issue of high organic carbon costs in heterotrophic cultivation of microalgae, we evaluated the hypotheses by employing microalgae as a biorefinery for proteins and advanced biofuels after cultivation on volatile fatty acids (VFAs) instead of pure glucose. To prevent the inhibitory effect of VFAs on lipid synthesis, strains capable of tolerating high levels of VFAs were selected. Growth and lipid synthesis by two freshwater microalgae, Auxenochlorella protothecoides and Chlorella sorokiniana, was optimized at different VFA concentrations. Maximum biomass and lipid content in A. protothecoides (10.66 g/L, 33.93%) and C. sorokiniana (7.98 g/L, 39.80%) were obtained by replacing glucose with 30 g/L acetate at C/N 60. The generated lipids were compliant with existing standards for biodiesel. Moreover, when grown on acetate, both microalgae contained the complete range of essential and non-essential amino acids. Finally, single-source commercial VFAs were replaced with VFAs mixture after acidogenic fermentation of waste lignocellulosic biomass from brewers' spent grain. The mixture allowed successful mixotrophic and heterotrophic cultivation of both microalgae, demonstrating feasibility of this low-cost carbon source in fuel-grade biodiesel production.

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