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Myo-inositol promotes lipid production and nutrients removal by microalga under molasses wastewater

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  • Qiao, Tengsheng
  • Zhao, Yongteng
  • Han, Benyong
  • Li, Tao
  • Zhao, Peng
  • Xu, Jun-Wei
  • Huang, Li
  • Yu, Xuya

Abstract

Microalgae-based wastewater treatment can fulfill the dual roles for biofuel production and wastewater bioremediation. The present study focused on the effects of myo-inositol (MI) on the lipid production of Monoraphidium sp. QLY-1 and nutrients removal of molasses wastewater (MW). The highest microalgal lipid productivity (134.70 mg L−1 d−1) was achieved under 0.5 g L−1 MI treatment, which was 1.35-fold higher than the pure MW group. Besides, the nutrients and metals removal from MW were significantly elevated after applying MI. Mechanism exploration revealed that the algal intracellular protein content, glutathione (GSH) level, and the expressions of key lipogenic genes were significantly elevated, while the carbohydrate content and reactive oxygen species (ROS) level were suppressed in the presence of MI, which provided more precursors and a balanced redox condition for lipid biosynthesis. More importantly, the phytohormones abscisic acid (ABA) and ethylene (ET) contents were significantly improved by MI, which was likely responsible for the promotion of lipid accumulation. This research suggests that MI is a promising stimulant for enhancing microalgal lipid production and wastewater nutrients removal, and contributes to regulating the microalgal lipid accumulation in wastewater using exogenous hormones.

Suggested Citation

  • Qiao, Tengsheng & Zhao, Yongteng & Han, Benyong & Li, Tao & Zhao, Peng & Xu, Jun-Wei & Huang, Li & Yu, Xuya, 2021. "Myo-inositol promotes lipid production and nutrients removal by microalga under molasses wastewater," Renewable Energy, Elsevier, vol. 172(C), pages 327-335.
    • Handle: RePEc:eee:renene:v:172:y:2021:i:c:p:327-335
    DOI: 10.1016/j.renene.2021.03.051
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    References listed on IDEAS

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    1. Cai, Ting & Park, Stephen Y. & Li, Yebo, 2013. "Nutrient recovery from wastewater streams by microalgae: Status and prospects," Renewable and Sustainable Energy Reviews, Elsevier, vol. 19(C), pages 360-369.
    2. Ju, Jung-Hyun & Ko, Dong-Jin & Heo, Sun-Yeon & Lee, Jong-Jea & Kim, Young-Min & Lee, Bong-Soo & Kim, Min-Soo & Kim, Chul-Ho & Seo, Jeong-Woo & Oh, Beak-Rock, 2020. "Regulation of lipid accumulation using nitrogen for microalgae lipid production in Schizochytrium sp. ABC101," Renewable Energy, Elsevier, vol. 153(C), pages 580-587.
    3. Huang, GuanHua & Chen, Feng & Wei, Dong & Zhang, XueWu & Chen, Gu, 2010. "Biodiesel production by microalgal biotechnology," Applied Energy, Elsevier, vol. 87(1), pages 38-46, January.
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    1. Zhao, Yongteng & Qiao, Tengsheng & Gu, Dan & Zhu, Liyan & Yu, Xuya, 2022. "Stimulating biolipid production from the novel alga Ankistrodesmus sp. by coupling salt stress and chemical induction," Renewable Energy, Elsevier, vol. 183(C), pages 480-490.

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