Robust magnetic vivianite recovery from digested sewage sludge: Evaluating resilience to sludge dry matter and particle size variations

H.V. Nguyen*, T. Prot, W. Wijdeveld, L. Korving, A. I. Dugulan, E. Brück, A. Haarala, M. C.M. van Loosdrecht

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Phosphorus recovery via vivianite extraction from digested sludge has recently gained considerable interest. The separation of vivianite was demonstrated earlier at the pilot scale, and operational parameters were optimized. In this study, we tested the robustness of this technology by changing the sludge characteristics, such as dry matter, and via that, sludge viscosity, and vivianite particle size. It was proven that the main factor influencing recovery was the concentration of vivianite in the feed. The technology can extract vivianite even when the sludge has higher dry matter (1.8% - 3.3%) and, therefore, higher viscosity. Smaller vivianite sizes (< 10 µm) can still be recovered but at a lower rate. This made magnetic separation applicable to a wide range of wastewater treatment plants.

Original languageEnglish
Article number122407
Number of pages10
JournalWater Research
Volume266
DOIs
Publication statusPublished - 2024

Keywords

  • Magnetic separation
  • Particle size
  • Phosphorus recovery
  • Pilot scale operation
  • Sludge viscosity
  • Vivianite

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