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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

邮发代号 80-973

2018 Impact Factor: 3.883

Frontiers of Environmental Science & Engineering  2025, Vol. 19 Issue (1): 5   https://doi.org/10.1007/s11783-025-1925-7
  本期目录
Self-driven phosphate enrichment by hydrogel beads for nutrient recovery
Zeou Dou, Yixuan Huang, Xing Xie()
School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
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Abstract

The enrichment of phosphate is necessary for high-efficiency nutrient recovery from wastewater through struvite precipitation. However, the majority of current nutrient enrichment processes focus on membrane-based technologies driven by external energy input. Here, the phosphate enrichment by negatively charged Poly(sodium acrylate) hydrogel beads as the self-driven dewatering agent under different conditions was investigated. The phosphate rejection decreased as its concentration increased but retained 56.9% even in 10 mmol/L PO43− solution, which is well beyond the phosphate concentration in typical wastewater concentrates. Phosphate was concentrated 3.6 folds with a recovery of 70% using ~1 wt% of hydrogel beads in 0.5 mmol/L phosphate solution. The effects of the pH, ionic strength of the nutrient stream, and the swelling ratio of hydrogels on the rejection of phosphate were investigated. In addition, the hydrogel beads removed 100% of nickel ions during the dewatering of the phosphate solution (0.5 mmol/L Ni2+ and 0.5 mmol/L PO43−), presenting an opportunity for simultaneous phosphate enrichment and purification during the pretreatment for nutrient recovery from wastewater. This study demonstrated that the spontaneous dewatering process utilizing ion-selective hydrogels is promising for nutrient enrichment to promote recovery efficiency.

Key wordsNutrient recovery    Hydrogel    Ion selectivity    Phosphate    Separation
收稿日期: 2024-03-31      出版日期: 2024-10-29
Corresponding Author(s): Xing Xie   
 引用本文:   
. [J]. Frontiers of Environmental Science & Engineering, 2025, 19(1): 5.
Zeou Dou, Yixuan Huang, Xing Xie. Self-driven phosphate enrichment by hydrogel beads for nutrient recovery. Front. Environ. Sci. Eng., 2025, 19(1): 5.
 链接本文:  
https://academic.hep.com.cn/fese/CN/10.1007/s11783-025-1925-7
https://academic.hep.com.cn/fese/CN/Y2025/V19/I1/5
Medium Concentration (mmol/L) pH
H3PO4 3 2.41
H3PO4 + NaH2PO4 1.5 + 1.5 2.74
NaH2PO4 3 5.04
NaH2PO4 + Na2HPO4 1.5 + 1.5 7.1
Na2HPO4 3 9.12
Na2HPO4 + Na3PO4 1.5 + 1.5 11.12
Na3PO4 3 11.25
Tab.1  
Fig.1  
Fig.2  
Fig.3  
Fig.4  
Fig.5  
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