Abstract

CAMARGO, CC; GUIMARAES, JR  and  TONETTI, AL. Treatment of landfill leachate: removal of ammonia by struvite formation. Water SA [online]. 2014, vol.40, n.3, pp.491-494. ISSN 1816-7950.  http://dx.doi.org/10.4314/wsa.v40i3.12.

This paper presents a study of ammoniacal nitrogen removal by chemical precipitation resulting in the formation of ammonium and magnesium phosphat (MgNH₄PO₄∙6H₂O), known as struvite, from the leachate in the Delta A landfill, located in the city of Campinas, Sáo Paulo, Brazil. After the addition of a magnesium source (MgCl₂∙6H₂O), and phosphorus (Na₂HPO₄∙12H₂O), ammoniacal nitrogen was precipitated as highly insoluble salt. The removal of ammoniacal nitrogen from the leachate exceeded 85% when the reaction was performed at an initial pH of 10.0. The highest efficiencies were achieved when the molar ratio between the ions involved in the reaction, i.e., Mg²⁺:PO₄^3-:NH₄⁺, was 1.2:1.0:1.0, respectively.

Keywords : landfill; leachate; ammonia; nitrogen removal.

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