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模拟快速沙过器以理解和设计使用反应式运输建模的连续铁和去除

Emiel Kruisdijk¹, Boris M van Breukelen¹, Doris van Halem¹

¹Delft University of Technology, Faculty of Civil Engineering and Geosciences, Department of Water Management, Stevinweg 1, 2628 CN Delft, the Netherlands.

|October 1, 2024

概括

在快速沙 (RSF) 中同时氧化铁和限制了的去除. 设计具有不同的层的RSF可以在空间上分离这些氧化过程,以提高效率.

科学领域:

环境工程环境工程
水处理技术水处理技术
地质化学地质化学

背景情况:

快速沙子过器 (RSF) 对于从水中去除溶解的铁 (Fe2+) 和 (Mn2+) 是至关重要的.
了解矿物涂层 (Fe和Mn) 的空间分布和影响是优化RSF性能的关键.
现有的模型往往预测了连续的Fe2+和Mn2+氧化,这可能不反映现实世界的过条件.

研究的目的:

研究Fe和Mn矿物涂层在单媒体和双媒体RSF的空间分布.
确定这些涂层如何影响Fe2+,Mn2+和 (NH4+) 的氧化序列和速度.
为设计更高效的地下水过器提供见解.

主要方法:

在PHREEQC.中使用反应式运输建模 (RTM).
采用PEST用于模型校准的参数估计.
研究了三种单介质和三种双介质的全尺寸快速沙过器.

主要成果:

与理论预测相反,Fe2+和Mn2+氧化主要同时发生.
反冲洗导致谷物混合,导致顶层混合Fe/Mn涂层谷物的异质Mn2+氧化.
混合涂层限制了Mn2+的氧化,而Fe2+的氧化率在较低的pH值时增加.

结论:

RSF设计可以在空间上分离Fe2+和Mn2+氧化,以提高Mn2+的去除.
建议使用双层过器来抑制谷物混合,在顶层完成Fe2+氧化.
开发的RTM有助于确定最佳的层交叉深度,以实现高效的地下水处理.

关键词:

铁铁铁是什么意思铁铁铁氧化过程中的氧化.害虫害虫害害虫害虫害害虫害虫害害害虫害虫害害害虫害虫害害害虫害害害害虫害害害虫害害害害害害害害害害害害害害害害害害害害在 PHREEQCQC 的时间里.反应式运输建模反应式运输建模快速的沙子过器快速的沙子过器

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