Pyrolysis process as a sustainable management option of poultry manure: Characterization of the derived biochars and assessment of their nutrient release capacities

Samar Hadroug, Salah Jellali*, James J. Leahy, Marzena Kwapinska, Mejdi Jeguirim, Helmi Hamdi, Witold Kwapinski

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)


Raw poultry manure (RPM) and its derived biochars at temperatures of 400 (B400) and 600 °C (B600) were physico-chemically characterized, and their ability to release nutrients was assessed under static conditions. The experimental results showed that RPM pyrolysis operation significantly affects its morphology, surface charges, and area, as well as its functional groups contents, which in turn influences its nutrient release ability. The batch experiments indicated that nutrient release from the RPM as well as biochars attains a pseudo-equilibrium state after a contact time of about 48 h. RPM pyrolysis increased phosphorus stability in residual biochars and, in contrast, transformed potassium to a more leachable form. For instance, at this contact time, P- and K-released amounts passed from 5.1 and 25.6 mg g-1 for RPM to only 3.8 and more than 43.3 mg g-1 for B400, respectively. On the other hand, six successive leaching batch experiments with a duration of 48 h each showed that P and K release from the produced biochars was a very slow process since negligible amounts continued to be released even after a total duration of 12 days. All these results suggest that RPM-derived biochars have specific physico-chemical characteristics allowing them to be used in agriculture as low-cost and slow-release fertilizers.

Original languageEnglish
Article number2271
JournalWater (Switzerland)
Issue number11
Publication statusPublished - Nov 1 2019


  • Biochar
  • Characterization
  • Leaching
  • Phosphorus
  • Potassium
  • Pyrolysis
  • Raw poultrymanure

ASJC Scopus subject areas

  • Biochemistry
  • Geography, Planning and Development
  • Aquatic Science
  • Water Science and Technology

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