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Enhancing CO 2 Fixation and Wastewater Treatment Performance by Assembling MgFe-LDH on Chlorella pyrenoidosa

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  • Huanan Xu

    (School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China)

  • Hao Zhou

    (School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China)

  • Yinfeng Hua

    (Shanghai Pudong Environmental Protection Energy Development Co., Ltd., Shanghai 200127, China)

  • Weihua Chen

    (Shanghai Liming Resources Reuse Co., Ltd., Shanghai 201209, China)

  • Jian Wu

    (Shanghai Liming Resources Reuse Co., Ltd., Shanghai 201209, China)

  • Zhenwu Long

    (School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China)

  • Liang Zhao

    (School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China)

  • Lumei Wang

    (School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China)

  • Guoqing Shen

    (School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China)

  • Qincheng Chen

    (School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
    Shanghai Yangtze River Delta Eco-Environmental Change and Management Observation and Research Station (Shanghai Urban Ecosystem Research Station), Ministry of Science and Technology, National Forestry and Grassland Administration, 800 Dongchuan Road, Shanghai 200240, China)

Abstract

Microalgae are considered to be a dual solution for CO 2 fixation and biogas slurry purification due to their high photosynthetic efficiency and strong environmental adaptability. However, their application is constrained by the low solubility of CO 2 in the solution environment, which restricts microalgal growth, resulting in low biomass production and poor slurry purification efficiency. In this study, we developed MgFe layered double hydroxide (LDH) that spontaneously combined with Chlorella pyrenoidosa to help it concentrate CO 2 , thereby increasing biomass yield and purification capacity for food waste biogas slurry. The prepared MgFe-LDH exhibited a typical layered structure with a CO 2 adsorption capacity of 4.44 mmol/g. MgFe-LDH and C. pyrenoidosa carried opposite charges, enabling successful self-assembly via electrostatic interaction. Compared with the control, the addition of 200 ppm MgFe-LDH increased C. pyrenoidosa biomass and pigment content by 36.82% and 63.05%, respectively. The removal efficiencies of total nitrogen, total phosphorus, and ammonia nitrogen in the slurry were enhanced by 20.04%, 31.54% and 14.57%, respectively. The addition of LDH effectively alleviated oxidative stress in C. pyrenoidosa and stimulated the secretion of extracellular polymeric substances, thereby enhancing the stress resistance and pollutant adsorption capabilities. These findings provided a new strategy for the industrial application of microalgal technology in CO 2 fixation and wastewater treatment.

Suggested Citation

  • Huanan Xu & Hao Zhou & Yinfeng Hua & Weihua Chen & Jian Wu & Zhenwu Long & Liang Zhao & Lumei Wang & Guoqing Shen & Qincheng Chen, 2025. "Enhancing CO 2 Fixation and Wastewater Treatment Performance by Assembling MgFe-LDH on Chlorella pyrenoidosa," Sustainability, MDPI, vol. 17(20), pages 1-17, October.
    • Handle: RePEc:gam:jsusta:v:17:y:2025:i:20:p:8970-:d:1767900
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    References listed on IDEAS

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    1. Xu, Xianzhen & Gu, Xiaoguang & Wang, Zhongyang & Shatner, William & Wang, Zhenjun, 2019. "Progress, challenges and solutions of research on photosynthetic carbon sequestration efficiency of microalgae," Renewable and Sustainable Energy Reviews, Elsevier, vol. 110(C), pages 65-82.
    2. Ousmane Dao & Marie Bertrand & Saleh Alseekh & Florian Veillet & Pascaline Auroy & Phuong-Chi Nguyen & Bertrand Légeret & Virginie Epting & Amélie Morin & Stephan Cuiné & Caroline L. Monteil & Luke C., 2025. "The green algae CO2 concentrating mechanism and photorespiration jointly operate during acclimation to low CO2," Nature Communications, Nature, vol. 16(1), pages 1-12, December.
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