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Electrochemically and Bioelectrochemically Induced Ammonium Recovery
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Dynamic ammonium retention for nutrient separation from manure digestate.

Marrit van der Wal1, Joep van Alphen1, Kitty Nijmeijer1

  • 1Membrane Materials and Processes, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, Eindhoven 5600 MB, The Netherlands.

Waste Management (New York, N.Y.)
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PubMed
Summary

Manure digestate can be separated into nitrogen and potassium fertilizers using a pH-controlled membrane process. This method effectively recovers valuable nutrients for precision fertilization, reducing environmental impact.

Keywords:
Developing selectivityDynamic retentionManure treatmentNutrient separationpH adjustment

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Area of Science:

  • Environmental Science
  • Chemical Engineering
  • Agricultural Science

Background:

  • Extensive nitrogen emissions necessitate manure valorization and nutrient fractionation for precision fertilization.
  • Current methods struggle to separate ammonium (NH4+) and potassium (K+) from liquid digestate due to similar ionic properties.

Purpose of the Study:

  • To develop an effective method for separating nitrogen (N) and potassium (K) from liquid manure digestate.
  • To enable the production of N- and K-rich fertilizers for precision application.

Main Methods:

  • Utilized a dynamic pH adjustment strategy to control the ammonia (NH3)/ammonium (NH4+) equilibrium.
  • Employed membrane separation, specifically reverse osmosis (RO) membranes, with varying pH conditions.
  • Tested separation efficiency using both artificial solutions and real liquid digestate.

Main Results:

  • Alkaline pH conditions (pH 10) significantly enhanced N/K selectivity, with RO BW membranes achieving a selectivity of 35.
  • At pH 10, over 80% of total ammonia existed as NH3, facilitating easier membrane permeation.
  • A two-step RO system, involving low pH concentration, successfully produced separate N- and K-enriched fractions.

Conclusions:

  • Dynamic pH control is a viable strategy for selective N/K separation from liquid digestate.
  • The developed membrane process enables the recovery of valuable N and K nutrients, supporting sustainable agriculture and environmental protection.
  • This approach offers a pathway to producing targeted fertilizers from manure waste.