Magnesium ammonium phosphate precipitation method in the treatment of ammonia nitrogen in the landfill leachate analysis of influence factors

Magnesium ammonium phosphate by adding magnesium salt and phosphate to ammonia nitrogen landfill leachate, The medicament and ammonia nitrogen landfill leachate Mg-2(+) PO3- ions in NH4+ after chemical reaction of producing magnesium ammonium phosphate. In the whole reaction process is influenced by pH value, reaction time, reactant ratio etc.. The effects of pH, reaction time, reactant ratio and Calcium ions amount on ammonia-nitrogen removal efficiency and the residual concentrations of ammonia-nitrogen have been investigated respectively. The optimum reaction conditions by orthogonal experiment are Mg-2(+): PO43-: NH4+= 1.2: 1: 1, pH=9, t=15min and Ca-2(+)/Mg-2(+)=0. Ammonia-nitrogen removing tests of Laohuchong landfill leachate performed under the optimum conditions, and the best removal efficiency is above of 60%.