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Promotion of Microalgal Growth, CO 2 Fixation, and Pollutant Removal in Piggery Effluent by a Column Photobioreactor with Funnel-Shaped Spoilers

Author

Listed:
  • Yinghui Ji

    (College of Chemical and Material Engineering, Quzhou University, Quzhou 324000, China
    College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China)

  • Hui Zhang

    (School of Life Sciences, Jinggangshan University, Ji’an 343009, China)

  • Pin Wang

    (Zhejiang Geological Institute of Metallurgical Geology of China, Quzhou 324000, China)

  • Guohui Lin

    (Zhejiang Juhua Cogeneration Co., Ltd., Quzhou 324000, China)

  • Haining Yang

    (Zhejiang Juhua Cogeneration Co., Ltd., Quzhou 324000, China)

  • Hai-Xiang Cheng

    (College of Chemical and Material Engineering, Quzhou University, Quzhou 324000, China)

Abstract

To enhance contact time between microalgae and nutrients in reactors, thereby improving the growth rate of microalgae and increasing pollutant removal efficiency, two funnel-shaped spoilers were added inside a traditional column photobioreactor. Compared to conventional column photobioreactors, the addition of these spoilers resulted in increased updraft, which improved horizontal flow. This change led to a greater shear force near the spoilers and a reduction in bubble diameter. As a result, the mass transfer coefficient and gas content increased by 12.17% and 7.71%, respectively, while the mixing time decreased by 30.57%. These improvements resulted in an 18.18% increase in microalgal biomass, a 13.95% increase in the CO 2 fixation rate, and increases of 4.48%, 7.5%, and 4.7% in the removal of COD, TP, and NH 4 + -N, respectively, in the column photobioreactor with funnel-shaped spoilers. This was achieved when CO 2 was introduced at a concentration of 10%, compared to a conventional column photobioreactor. This innovative design enhances the growth efficiency of microalgae, offering a new solution for reducing carbon emissions, promoting recycling of water resources, and advancing sustainable development.

Suggested Citation

  • Yinghui Ji & Hui Zhang & Pin Wang & Guohui Lin & Haining Yang & Hai-Xiang Cheng, 2025. "Promotion of Microalgal Growth, CO 2 Fixation, and Pollutant Removal in Piggery Effluent by a Column Photobioreactor with Funnel-Shaped Spoilers," Sustainability, MDPI, vol. 17(10), pages 1-17, May.
    • Handle: RePEc:gam:jsusta:v:17:y:2025:i:10:p:4511-:d:1656600
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