Struvite precipitation for ammonium removal from anaerobically treated effluents

Ania Escudero*, Fernando Blanco, Arrate Lacalle, Miriam Pinto

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)


The main objective of this research was to study the struvite precipitation process in relation to ammonium removal from anaerobically treated effluents. For this purpose, we investigated how the process was affected by the source of PO43- and Mg2+, temperature, effluent solid content and Mg:NH4:PO4 molar ratio. Use of Na3PO4·12H2O and MgCl2·6H2O without pH adjustment, for an effluent initially containing 2500 mg NH4+ L-1 and an Mg:NH4:PO4 molar ratio of 1:1:1, 95% of the NH4+ was removed in only 30 s. The efficacy of the process was not significantly affected by temperature (4, 22 and 35 °C) or by prior centrifugation of the effluent. As the molar ratio of Mg:NH4:PO4 was increased, the residual NH4+ in the effluents decreased, and for a specific Mg:NH4:PO4 molar ratio, similar amounts of NH4+ were removed from all of the effluents studied. Thus, the amounts of Mg2+ and PO43- required to achieve a specific residual NH4+ content in the supernatant can be estimated for this type of anaerobically treated effluent if the initial NH4+ concentration is known.
Original languageEnglish
Pages (from-to)413-419
Number of pages7
JournalJournal of Environmental Chemical Engineering
Issue number1
Early online date14 Jan 2015
Publication statusPublished - Mar 2015


  • Struvite precipitation
  • Anaerobically treated effluent
  • Ammonium removal
  • Phosphate and magnesium sources


Dive into the research topics of 'Struvite precipitation for ammonium removal from anaerobically treated effluents'. Together they form a unique fingerprint.

Cite this