Utilization of water hyacinth (Eichhornia crassipes) rejects as phosphate-rich fertilizer

Anyi Ramirez, Sebastián Pérez, Elizabeth Flórez, Nancy Acelas

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Phosphorus (P) recovery from water hyacinth is one of the promising sources to recovery and recycle P to alleviate P supply shortage in the future. The result of calcination temperature during the thermal treatment of calcium (Ca) and P-rich water hyacinth is presented here. Results showed a Ca/P molar ratio of 5.07 in water hyacinth ashes and, that with the increase in calcination temperature, P and Ca are transformed into hydroxyapatite. The amount of hydroxyapatite increased until 34.0 %, while other Ca phases such as CaO, CaCO3, and Ca(OH)2 were obtained in 6.1 %, 3.9 %, and 18.0 %, respectively. The bioavailability test showed that the material produced at 700 °C (hydroxyapatite and other Ca-rich phases) could be used as a fertilizer, with P slow release in aqueous solutions, giving up 3.7 % and 29.3 % of P release in deionized water and formic acid, respectively. Besides, CaO and Ca(OH)2 are used for soil neutralization as their disposition can help the crops.

Original languageEnglish
Article number104776
JournalJournal of Environmental Chemical Engineering
Issue number1
StatePublished - Feb 2021


  • Biomass
  • Calcium phosphate
  • Hydroxyapatite
  • Phosphate recycling
  • Water hyacinth

Product types of Minciencias

  • A1 article - Q1


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