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<p>The composition of microalgae biomass is a critical factor determining its downsteam utilization potential. Both reactor type and culture medium composition have be indicated exert significant influences on microalgal composition. This study investigated the cultivation of <i>Chlorella sp.</i> in bench-scale ponds using anaerobic digestion wastewater as the culture medium, with the BG11 standard culture medium was set as control.This study focused on evaluating the effects of open and closed reactor systems on nutrients removal from wastewater by microalgae, while analyzing the ion content of microalgal biomass to clarify its compositional characteristics. Results demonstrated that the ash content, lipid content, and protein content of microalgae cultivated in the closed system were approximately 3%, 5%, and 10% lower than those in the open system, respectively. The lipid content of microalgae grown in fertilizer wastewater (FW) was 3.5% higher than that of that of microalgae cultivated in the BG11 culture medium. Morphologically, the microalgal cells from FW-8 runs (eightfold diluted FW) appeared larger than those from the BG11 runs. Further observations revealed that ash compounds accumulated around the microalgal cells, which may cause damage to the cell structure. The heavy metal contents of microalgae cultivated in FW met the relevant quality requirements for feedstocks used in biofuel production, animal feed, and biofertilizer preparation. Overall, this study realized the co-production of microalgal-based products and efficient wastewater treatment, providing a theoretical and technical basis for the resource utilization of anaerobic digestion wastewater and the sustainable development of the microalgal industry.</p> Graphical Abstract <p></p>

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Nutrients Recovery and Microalgae-Based Products by Chlorella sp. Cultivated with Anaerobic Digestate

  • 期刊论文

  • 发表日期：

    2026年2月27日

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  • Xinfeng Wang,
  • Taili Dong,
  • Haifeng Lu,
  • Zhidan Liu,
  • Jirigala Bao,
  • Zhengxiang Shi,
  • Baoming Li

摘要

The composition of microalgae biomass is a critical factor determining its downsteam utilization potential. Both reactor type and culture medium composition have be indicated exert significant influences on microalgal composition. This study investigated the cultivation of Chlorella sp. in bench-scale ponds using anaerobic digestion wastewater as the culture medium, with the BG11 standard culture medium was set as control.This study focused on evaluating the effects of open and closed reactor systems on nutrients removal from wastewater by microalgae, while analyzing the ion content of microalgal biomass to clarify its compositional characteristics. Results demonstrated that the ash content, lipid content, and protein content of microalgae cultivated in the closed system were approximately 3%, 5%, and 10% lower than those in the open system, respectively. The lipid content of microalgae grown in fertilizer wastewater (FW) was 3.5% higher than that of that of microalgae cultivated in the BG11 culture medium. Morphologically, the microalgal cells from FW-8 runs (eightfold diluted FW) appeared larger than those from the BG11 runs. Further observations revealed that ash compounds accumulated around the microalgal cells, which may cause damage to the cell structure. The heavy metal contents of microalgae cultivated in FW met the relevant quality requirements for feedstocks used in biofuel production, animal feed, and biofertilizer preparation. Overall, this study realized the co-production of microalgal-based products and efficient wastewater treatment, providing a theoretical and technical basis for the resource utilization of anaerobic digestion wastewater and the sustainable development of the microalgal industry.

Graphical Abstract