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Accumulation of long-chain fatty acids from Nannochloropsis salina enhanced by breaking microalgae cell wall under alkaline digestion

Author

Listed:
  • Qiu, Yaojing
  • Frear, Craig
  • Chen, Shulin
  • Ndegwa, Pius
  • Harrison, Joe
  • Yao, Yiqing
  • Ma, Jingwei

Abstract

Breaking cell wall is a key step for extracting intracellular components such as proteins and lipids from microalgae. This study investigated an alternative way to disrupt microalgae cell structure by controlling pH during anaerobic digestion. The undigested lipid fractions from microalgae was preserved as long chain fatty acids (LCFAs) through pH control at alkaline condition. The optimum anaerobic hydrolysis was observed under alkaline condition at pHs 10 and 11; a maximum concentration of LCFAs (1150 mg/L) was observed at pH 11.0 on the fourth day of anaerobic digestion, which mainly consisted of palmitic acid and palmitoleic acid. Under alkaline condition, no methane was produced because of the inhibition of methanogenesis. However, the efficiency of organics hydrolysis was significantly enhanced as more soluble chemical oxygen demand (SCOD) was detected at pH 10 (11,170 mg/L SCOD) and pH 11 (12,273 mg/L SCOD), which was nearly twice higher than neutral pH. Also, confocal and transmission electron microscopy images illustrated the damage of microalgae cell wall and distribution of released LCFAs. The results provide insight for developing low-cost options for harvesting lipids from algal biomass.

Suggested Citation

  • Qiu, Yaojing & Frear, Craig & Chen, Shulin & Ndegwa, Pius & Harrison, Joe & Yao, Yiqing & Ma, Jingwei, 2020. "Accumulation of long-chain fatty acids from Nannochloropsis salina enhanced by breaking microalgae cell wall under alkaline digestion," Renewable Energy, Elsevier, vol. 149(C), pages 691-700.
    • Handle: RePEc:eee:renene:v:149:y:2020:i:c:p:691-700
    DOI: 10.1016/j.renene.2019.12.093
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    References listed on IDEAS

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    1. Ahmad, A.L. & Yasin, N.H. Mat & Derek, C.J.C. & Lim, J.K., 2011. "Microalgae as a sustainable energy source for biodiesel production: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(1), pages 584-593, January.
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    1. Abomohra, Abd El-Fatah & Eladel, Hamed & Mohammed, Soha, 2022. "Dual use of a local Protosiphon isolate BENHA2020 for biodiesel production and antioxidant activity of lipid-free biomass: A novel biorefinery approach for biomass valorization," Renewable Energy, Elsevier, vol. 184(C), pages 1104-1111.
    2. Li, Xinxin & Han, Ruirui & Song, Chuang & Liu, Yanping, 2022. "Preparation of polyvinyl alcohol-calcium sustained-release agent employed to degrade long-chain fatty acids and improve the performance of anaerobic digestion of food waste," Renewable Energy, Elsevier, vol. 199(C), pages 653-661.

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