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The Formation of struvite Scale Formation and the Effect of As(V) and Hg(II) Impurities

Magnesium ammonium phosphate hexahydrate (MgNH4PO4·6H2O Struvite) scale deposits is often a serious operational problem in anaerobic treatment of municipal waste water and other industrial wastewaters. The kinetics of the nucleation and crystal growth at conditions simulating municipal wastewater was investigated in a 1L reactor at conditions of constant supersaturation at pΗ 9.50 25°C both in the absence and in the presence of As(V) and Hg(II) at concentration levels precluding the formation of insoluble salts of these impurities. Over the range of the relative supersaturation with respect to struvite investigated (σ=0.096-0.37) the presence of As(V) resulted in lower rates of crystal growth while the mechanism was the same in both cases i.e. surface diffusion controlled. The effect of As(V) concentration on the crystal growth rates of struvite was diminished as the supersaturation increased. The presence of As(V) at concentrations in the range 0.1-1 mM resulted in 90% reduction of the rates of crystal growth while induction times increased significantly. The presence of Hg(II) resulted in acceleration of the rates of crystal growth while no induction times were observed. In both cases equilibrium adsorption measurements showed that the effect of As(V) and Hg(II) is due to the interaction of these ions with the surface of the growing supercritical struvite nuclei.

Product Number: 51319-12942-SG
Author: Petros Koutsoukos
Publication Date: 2019
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