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Citation: JIANG Ke, ZHOU Kang-Gen, PENG Jia-Le. Predominance Diagrams for NH4+-Mg2+-PO43--H+-H2O System[J]. Chinese Journal of Inorganic Chemistry, ;2012, 28(12): 2605-2611. shu

Predominance Diagrams for NH4+-Mg2+-PO43--H+-H2O System

  • 1.

    School of Metallurgical Science and Engineering, Central South University, Changsha, 410083, China

  • Corresponding author: ZHOU Kang-Gen, 
  • Received Date: 15 March 2012
    Available Online: 1 July 2012

    Fund Project: 国家自然科学基金(No.51174238)资助项目. (No.51174238)

  • The thermodynamics of NH4+-Mg2+-PO43--H+-H2O system was investigated based on the construction of predominance diagrams. The lgCT,Mg-lgCT,P and lgCT,P-pH diagrams were constructed at an arbitrary Mg/P molar ratio with consideration of the ion strength influence(CT,Mg: total concentration of magnesium; CT,P: total concentration of phosphorus; CT,N: total concentration of nitrogen). The thermodynamic stable zones of struvite (MgNH4PO4·6H2O), bobierrite (Mg3(PO4)2·8H2O), newberyite (MgHPO4·3H2O), and magnesium hydroxide (Mg(OH)2) were determined. The results show that struvite and bobierrite are the dominating phases in a wide range of pH value. Struvite and newberyite coexist with solute phase at low pH value and high total concentration of phosphorus while struvite and magnesium hydroxide are more stable at the alkaline condition. The minimum total concentration of nitrogen appears at pH value of 9.08~9.52 while struvite and bobierrite coexist with the solute phase. The predominance diagrams could be used to predict the precipitation-dissolution equilibrium of struvite for ammonia nitrogen removal and recovery from wastewater.
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