Effects of various process parameters on struvite precipitation kinetics and subsequent determination of rate constants

Water Science and Technology : a Journal of the International Association on Water Pollution Research
M S RahamanD S Mavinic

Abstract

In this paper, struvite (MgNH(4)PO(4).6H(2)O) precipitation kinetics were studied with different operating conditions (varying supersaturation, pH, Mg:P ratio, degree of mixing and seeding conditions) and relevant rate constants were determined by fitting a slightly modified first-order kinetic model to the experimental data obtained. The rate of change of ortho-P concentration in the bulk solutions increases with increasing supersaturation ratio. The estimated rate constants are 2.034, 1.716 and 0.690 hr(-1) for the supersaturation ratio of 9.64, 4.83, and 2.44, respectively. Kinetic parameters were also evaluated for the Mg:P ratio between the ranges of 1.0 and 1.6, indicating higher phosphorus removal efficiency with increasing Mg:P ratio. The rate constants were found to be 0.942, 2.034 and 2.712 hr(-1) for Mg:P ratios of 1.0, 1.3 and 1.6, respectively. The experimental observations for kinetic study of struvite precipitation with different stirrer speeds clearly show that the mixing intensity used had little effect on the intrinsic rate constants. K values found to be 2.034 and 1.902 h(-1) for 100 and 70 rpm, respectively. Seeding, with 250-500 microm of seed crystals during the struvite precipitation kinetics test, was fo...Continue Reading

Citations

Jan 1, 2016·Journal of Environmental Management·Wendong TaoMatthew P Huchzermeier
Jun 9, 2016·Journal of Environmental Sciences (China)·Xueyu LiuXiaoguang Meng
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Apr 10, 2019·Environmental Science & Technology·Rachel A YeeYang Liu
Jul 25, 2018·Journal of Environmental Sciences (China)·Jinsong WangShaohua Chen

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