Poultry manure conversion into eco-friendly materials: synthesis of Mg-/Al-based biochars, characterization and application for phosphorus recovery from aqueous solutions

Samar Hadroug, Salah Jellali, Mansour Issaoui, Marzena Kwapinska, Mejdi Jeguirim, James J. Leahy, Witold Kwapinski

Research output: Contribution to journalArticlepeer-review

Abstract

This work explores the conversion of raw poultry manure (RPM) into tailor-made biochars for an efficient phosphorus (P) recovery from aqueous solutions. To this end, three RPM-functionalized biochars with Mg (RPM-B-Mg), Al (RPM-B-Al), and Mg/Al-layered double hydroxides (RPM-B-Mg/Al-LDHs) were synthetized, deeply characterized, and then tested for P recovery under various experimental conditions. Biochar characterization showed that RPM-B-Mg/Al-LDHs had enhanced texture and surface chemistry linked to the formation/deposition of Mg- and Al-based nanoparticles. In addition, this biochar exhibited the highest P recovery rate from effluents (78 mg g−1). This recovery process seems to occur heterogeneously on multilayers through electrostatic interactions, ligand exchange, surface precipitation as AlPO4 and Mg3(PO4)2, and complexation. Phosphorus desorption from these P-loaded biochars was significantly dependent on the pH of eluent solutions with the highest desorption yield observed at an initial pH of 9.0 (88%). All these findings indicate that the use of Mg/Al-LDHs-loaded poultry manure biochar can be considered a sustainable material for P recovery from aqueous solutions. Furthermore, the P-loaded biochar could be reused in agriculture as a low-cost biofertilizer in P-depleted soils.

Original languageEnglish
Pages (from-to)25379-25393
Number of pages15
JournalBiomass Conversion and Biorefinery
Volume14
Issue number20
DOIs
Publication statusPublished - Oct 2024

Keywords

  • Double-layered hydroxides
  • Manure
  • Modification
  • Phosphorus
  • Pyrolysis
  • Recovery

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