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Nutrient recovery from digestate: Pilot test experiments.

Vera Proskynitopoulou1, Ioannis Garagounis2, Anastasios Vourros2

  • 1ARTEMIS Laboratory, Chemical Process and Energy Resources Institute, Centre for Research & Technology Hellas (CERTH), 6th km Charilaou-Thermi Road, Thermi, P.O. Box: 60361, 57001 Thessaloniki, Greece; Laboratory of Chemical & Environmental Technology, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki, Greece.

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Summary

Pilot-scale processing of digestate using sequential filtration, electrodialysis, and UV/ozonation recovered nutrients and clarified water for reuse. This technology effectively reduced solids and organics, enhancing digestate quality.

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Area of Science:

  • Environmental Engineering
  • Waste Management
  • Water Treatment Technologies

Background:

  • Digestate, a byproduct of anaerobic digestion, requires processing for nutrient recovery and reuse.
  • Agricultural and animal wastes generate digestate with high solids and organic loads.
  • Current methods often fall short in comprehensive digestate treatment and nutrient recovery.

Purpose of the Study:

  • To evaluate a series of technologies for pilot-scale digestate processing.
  • To recover valuable nutrients like ammonium, potassium, and phosphates.
  • To reduce solids and organics, improving digestate quality for potential reuse.

Main Methods:

  • Sequential application of microfiltration, ultrafiltration, reverse osmosis, selective electrodialysis, and UV/ozonation.
  • Processing of digestate from dairy, animal, and agricultural wastes.
  • Analysis of nutrient recovery rates and water clarification efficiency.

Main Results:

  • Membrane filtration (micro- and ultra-) removed over 80% of suspended solids and macromolecules.
  • Reverse osmosis achieved 85-100% solute removal, yielding clarified water.
  • Selective electrodialysis recovered over 95% of ammonium and potassium, and 55% of phosphates (75% as struvite).

Conclusions:

  • The integrated treatment system effectively processed digestate at pilot scale.
  • High nutrient recovery (ammonium, potassium, phosphates) was achieved.
  • The process produced high-quality clarified water suitable for reuse, demonstrating a viable waste-to-resource strategy.