Factors affecting ammonium capture by some Victorian lignites

Abstract

HighlightsVictorian lignites were assessed for their ${\mathrm{NH}}_4^{+}$ retention capacity using adsorption isotherms and ¹⁵N tracing.${\mathrm{NH}}_4^{+}$ adsorption capacity of lignites increased (up to 3-fold) with pH, especially from pH 5 to 7.Biological immobilisation did not play a substantial role in the ${\mathrm{NH}}_4^{+}$ retention capacity of the lignites.pH-dependent ${\mathrm{NH}}_4^{+}$ adsorption was the dominant means by which lignite retained ${\mathrm{NH}}_4^{+}$.

Keywords: Lignite; ammonium adsorption; animal manure; characterisation; nitrogen.