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

Huanan Xu, Hao Zhou, Yinfeng Hua, Weihua Chen, Jian Wu, Zhenwu Long, Liang Zhao, Lumei Wang, Guoqing Shen and Qincheng Chen ()
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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

Sustainability, 2025, vol. 17, issue 20, 1-17

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.

Keywords: layered double hydroxide; microalgae; CO 2 fixation; biogas slurry (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2025
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