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((VI) 通过连续流体铁电凝去除:运行条件的影响和在残留固体中的稳定性

Xicheng He¹, Elaine D Flynn², Jeffrey G Catalano²

¹Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States.

Environmental science & technology

|March 6, 2025

概括

铁电凝 (EC) 有效地从水中去除,即使是低剂量和短停留时间. 产生的固体是无害的,为污染提供了一个有前途的解决方案.

科学领域:

环境工程环境工程
水处理技术水处理技术
无机化学无机化学

背景情况:

水中的 (Se) 污染构成了广泛的环境和健康挑战.
(Se) 特别难以使用传统的水处理方法去除.

研究的目的:

评估铁电凝 (EC) 对于从水中去除Se(VI) 的有效性.
调查水化学和操作条件对Se(VI) 清除效率的影响.
描述产生的固体并评估它们的环境安全性.

主要方法:

使用带有铁电极的流通电凝反应堆.
多种操作参数,包括无氧/有氧条件,铁剂量和停留时间.
分析了Se(VI) 的去除百分比,并描述了由此产生的铁固体 (绿色生,磁铁).
在生成的固体上执行了毒性特征漏程序 (TCLP).

主要成果:

在无氧条件下,从1000μg/L Se中达到>98%的Se (VI) 去除.
观察到低铁剂量 (30 mg/L) 和短停留时间 (11 秒),然后沉,有效的去除.
清除效率在24小时内保持稳定,涉及反应性Fe (II) /Fe (III) 固体生成.
氧化条件的效果较差,原因是废水pH值升高,阻碍了Se吸附.
固定式Se是减少的形式,并通过TCLP产生的固体被归类为非危险的.

结论:

流通铁EC是一种高效的方法,可以从污染水中去除Se ((VI).
该工艺产生稳定,不危险的含铁固体,适合Se(VI) 和其它氧化离子的去除.
这项技术为设计高效的水处理系统和处理残留固体提供了实用见解.

关键词:

射线辐射光谱 X射线辐射光谱电凝凝电凝器的使用方法通过流通过流.铁氧化物铁氧化物是一种.毒性特征漏过程漏过程

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