使用红色泥混合物净化含有Cd的酸性废水:柱体试验,突破曲线和Cd的规格
Yisi Lu1, Xiaofeng Liu2, Hao Zhang3
1Yellow River Engineering Consulting Co., Ltd, Zhengzhou 450003, China; College of Civil Engineering, Taiyuan University of Technology, No. 79 West Yingze Street, Taiyuan 030024, China
概括
红泥混合物有效地修复了被 (Cd) 污染的酸性矿井排水 (AMD) 地下水. 这种透的反应性屏障材料表现出长期的酸缓冲和高Cd (II) 吸附能力,性能通过较低的流量和更高的包装高度来优化.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 修复水资源的修复方法
背景情况:
- 酸性矿井排水 (AMD) 对采矿区的地下水质量构成重大威胁.
- 在AMD中 (Cd) 污染需要有效的补救策略.
- 红色的泥和是潜在的低成本材料用于环境修复.
研究的目的:
- 评估红色泥混合物 (RM-L) 的安全性和有效性,用于从AMD中修复Cd (II) 污染的地下水.
- 调查操作参数对RM-L作为透反应屏障 (PRB) 的性能的影响.
- 在RM-L上分析Cd (II) 的长期稳定性和吸附机制.
主要方法:
- 进行了柱体测试,以模拟使用RM-L作为PRB的地下水整治.
- 系统分析了初始Cd(II) 度,流量和包装高度的变化.
- 后处理分析包括Cd的特异化和RM-L颗粒的表面形态检查.
主要成果:
- RM-L 呈现出较高的Cd(II) 突破时间,和时间和吸附能力,初始度和流量较低,包装高度更高.
- 在RM-L PRB中,对于含有Cd的酸性废水,RM-L PRB显示了持续的酸缓冲能力.
- 在RM-L上,Cd的分化主要是碳酸盐和铁氧化物形式,在处理后观察到表面结构变化.
结论:
- 含有Cd的RM-L是一种安全有效的材料,用于修复含有Cd的AMD污染的地下水.
- 优化包装高度和流速可以提高RM-L PRB的寿命和效率.
- 观察到的表面转变和Cd物种化为RM-L.的修复机制提供了洞察力.
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