Ammonia removal from landfill leachate by struvite precipitation/coated silica sand filtration
by Matthew Hendrix; Peter Grasel; Lee Martin; Kamal Tawfiq; Gang Chen
International Journal of Environment and Waste Management (IJEWM), Vol. 15, No. 3, 2015

Abstract: The objective of this study was to investigate onsite physicochemical systems for the treatment of landfill leachate with high ammonia content. A laboratory scale magnesium ammonium phosphate (struvite or MAP) precipitation system was tested and ammonia removal under various operational conditions was evaluated. For landfill leachate treatment by MAP precipitation, magnesium salts are a major economic constraint. It was demonstrated in this research that Mg²⁺, NH⁴⁺ and PO₄ ³⁻ stoichiometry and pH impacted MAP precipitation and subsequent ammonia removal. With the application of filtration in goethite-coated silica, ammonia removal can be dramatically improved. From this research, it was also discovered that goethite-coated silica sand can be used to remove excess phosphorous for the treatment of landfill leachate by struvite precipitation.

Online publication date: Thu, 30-Apr-2015

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