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The escalating challenge of phosphorus scarcity demands innovative solutions for nutrient recovery from waste streams. This study investigates the potential of an integrated electrodialytic extraction and struvite precipitation process to recover phosphorus from digestate, a nutrient-rich byproduct of anaerobic digestion. The research focuses on comparing phosphorus extraction from raw digestate and its liquid fraction using a three-compartment electrodialytic setup with anion and cation exchange membranes. Results revealed significant differences in phosphorus recovery efficiency between raw digestate (15 ± 2%) and its liquid fraction (34 ± 11%), highlighting the importance of sample composition and pre-treatment strategies. Subsequent struvite precipitation demonstrated promising outcomes, with phosphorus precipitation efficiencies reaching 69.2 ± 0.6% for raw digestate and 77.7 ± 6.3% for the liquid fraction. The study contributes to circular economy principles by demonstrating a viable method for converting waste streams into valuable resources. The liquid fraction’s superior performance suggests that targeted pre-treatment can enhance phosphorus extraction. Future research should focus on optimizing extraction parameters, conducting techno-economic assessments, and exploring simultaneous recovery of multiple nutrients from waste streams. These findings offer a promising approach to addressing phosphorus scarcity while promoting sustainable waste management strategies.

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Digestate as a Secondary Source of Phosphorus: Preliminary Analysis of Electrodialytic Extraction and Struvite Precipitation

  • 会议论文

  • 发表日期：

    2026年

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  • Verónica Oliveira,
  • Berta Riaño,
  • Celia Dias-Ferreia,
  • Beatriz Molinuevo-Salces,
  • Mari Cruz García-González

摘要

The escalating challenge of phosphorus scarcity demands innovative solutions for nutrient recovery from waste streams. This study investigates the potential of an integrated electrodialytic extraction and struvite precipitation process to recover phosphorus from digestate, a nutrient-rich byproduct of anaerobic digestion. The research focuses on comparing phosphorus extraction from raw digestate and its liquid fraction using a three-compartment electrodialytic setup with anion and cation exchange membranes. Results revealed significant differences in phosphorus recovery efficiency between raw digestate (15 ± 2%) and its liquid fraction (34 ± 11%), highlighting the importance of sample composition and pre-treatment strategies. Subsequent struvite precipitation demonstrated promising outcomes, with phosphorus precipitation efficiencies reaching 69.2 ± 0.6% for raw digestate and 77.7 ± 6.3% for the liquid fraction. The study contributes to circular economy principles by demonstrating a viable method for converting waste streams into valuable resources. The liquid fraction’s superior performance suggests that targeted pre-treatment can enhance phosphorus extraction. Future research should focus on optimizing extraction parameters, conducting techno-economic assessments, and exploring simultaneous recovery of multiple nutrients from waste streams. These findings offer a promising approach to addressing phosphorus scarcity while promoting sustainable waste management strategies.