Experimental and modeling column study of phosphorus removal by permeable reactive materials
Experimental and modeling column study of phosphorus removal by permeable reactive materials
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发表时间：
2017
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通讯作者：
O. Eljamal;A. Khalil;N. Matsunaga
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作者：
O. Eljamal;A. Khalil;N. Matsunaga
本研究通过实验和模型开发来评估可渗透反应材料去除水中磷的性能。建立了一个由传质方程和比表面积缩减描述多孔介质中吸附过程的一维溶质运移模型。该模型的有效性进行了评价，使用几个数据集，从批处理和列实验。本研究以大理石粉尘、标准砂及火山灰作为反应性渗透屏障及填充柱内的多孔材料。结果发现，钙（Ca）含量是渗透性反应材料的最重要的特征和一个因素，决定其除磷效率。高Ca含量的材料表现出更高的除磷能力。研究结果表明，大理石粉尘吸附剂对水溶液中的磷具有很高的去除效率。比较三种填料柱的性能，填充与不同组合的三种研究材料，渗透性的差异起着重要的作用，在处理停留时间和随后的效果对磷的去除效率。70%大理石粉尘和30%火山灰的组合（作为一个柱中的多孔填充层）在高稳定除磷效率（~80%）和寿命（超过180天）之间做出了合理的折衷。最后，根据这些结果提出了建议/建议。关键词微柱实验，大理石粉尘，磷，活性物质，溶质运移模型。
This study evaluates the performance of permeable reactive materials for phosphorus removal from water by experimental and model development. A one dimensional solute transport model that describes adsorption process in porous media by mass transfer equation and surface area reduction was developed. Validity of the model was evaluated using several data sets from batch and column experiments. The marble dust, standard sand and volcanic ash were utilized as permeable reactive barriers and porous materials inside packed columns in this research. It was found that the calcium (Ca) content was the most important characteristic of the permeable reactive materials and a factor determining their phosphorus removal efficiency. A high Ca content material showed higher removal capacity of phosphorus. The results of this study demonstrated that the marble dust sorbent has a high efficiency to remove phosphorus from aqueous solution. Comparing the performances of three packed columns filled up with different combinations of the three investigated materials, the differences in permeability played an important role in the treatment residence time and its ensuing effect on the removal efficiencies of phosphorus from water. A combination of 70% marble dust and 30% volcanic ash (as porous packed layers in one column) made a reasonable compromise between high steady phosphorus removal efficiency (~80%) and longevity (over 180 days). A suggestion/recommendation in conclusion was proposed based on these results. Keywords— column experiment, marble dust, phosphorus, reactive material, solute transport model.