Phosphorus Removal by Steel Slag Filters: Modeling Dissolution and Precipitation Kinetics to Predict Longevity
Phosphorus Removal by Steel Slag Filters: Modeling Dissolution and Precipitation Kinetics to Predict Longevity
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DOI：
10.1021/es500689t
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发表时间：
2014-07-01
影响因子：
11.4
通讯作者：
Comeau, Yves
中科院分区：
文献类型：
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作者：
Claveau-Mallet, Dominique;Courcelles, Benoit;Comeau, Yves
本文提出了一种适用于除磷碱性钢渣滤池寿命预测的原始数值模型。该模型包含钢渣溶解、羟基磷灰石和磷酸一钙沉淀以及磷酸一钙转化为羟基磷灰石的动力学速率。模型还包含钢渣耗尽的方程。利用钢渣进行了短期批量试验并持续监测pH值。在这些批量试验中对模型参数进行了校准，并且正确地重现了实验结果。然后使用PHREEQC软件将该模型转换为长期连续流模拟。进行了柱体模拟以测试进水磷浓度、进水无机碳浓度和孔隙水力停留时间对滤池寿命和磷保留能力的影响。进水高浓度的磷和无机碳以及孔隙的低水力停留时间会降低滤池寿命。该模型在柱体出口提供了符合实际的磷穿透情况。在寿命和磷保留能力方面，结果与之前使用相同钢渣进行的柱体实验相当。提出了一种基于简单批量试验和数值模拟的滤池设计方法。
This article presents an original numerical model suitable for longevity prediction of alkaline steel slag filters used for phosphorus removal. The model includes kinetic rates for slag dissolution, hydroxyapatite and monetite precipitation and for the transformation of monetite into hydroxyapatite. The model includes equations for slag exhaustion. Short-term batch tests using slag and continuous pH monitoring were conducted. The model parameters were calibrated on these batch tests and experimental results were correctly reproduced. The model was then transposed to long-term continuous flow simulations using the software PHREEQC. Column simulations were run to test the effect of influent P concentration, influent inorganic C concentration and void hydraulic retention time on filter longevity and P retention capacity. High influent concentration of P and inorganic C, and low hydraulic retention time of voids reduced the filter longevity. The model provided realistic P breakthrough at the column outlet. Results were comparable to previous column experiments with the same slag regarding longevity and P retention capacity. A filter design methodology based on a simple batch test and numerical simulations is proposed.