Comparison of coagulation performance and floc properties using a novel zirconium coagulant against traditional ferric and alum coagulants
Comparison of coagulation performance and floc properties using a novel zirconium coagulant against traditional ferric and alum coagulants
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DOI：
10.1016/j.watres.2012.04.043
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发表时间：
2012-09-01
期刊：
影响因子：
12.8
通讯作者：
Jefferson, Bruce
中科院分区：
文献类型：
--
作者：
Jarvis, Peter;Sharp, Emma;Jefferson, Bruce
整个上个世纪，饮用水处理中的混凝一直依靠铁 (Fe) 和铝 (Al) 盐来大量去除含有天然有机物 (NOM) 的水源水中的污染物。然而，随着这些水的质量恶化并且水质标准变得更加难以达到，现在需要改进对这些水的处理。替代性混凝剂化学品提供了一种简单且廉价的方法来实现这一点。在这项工作中，将一种新型锆 (Zr) 混凝剂与传统的铁和铝混凝剂进行了比较。与最佳传统混凝剂 (Fe) 相比，Zr 混凝剂能够将溶解有机碳 (DOC) 残留量降低 46% 至 150%。此外，当使用Zr混凝剂时，絮体性能显着改善，形成更大更强的絮体，Zr的中位絮体尺寸为930μm； Fe 为 710 μm，Al 为 450 μm。在中试规模的实验中，观察到了类似的 NOM 和颗粒去除的改进。结果表明，当针对 DOC 去除和低残留浊度进行优化时，Zr 混凝剂的性能优于在实验室和中试规模上测试的其他混凝剂。 (C) 2012 Elsevier Ltd. 保留所有权利。
Coagulation in drinking water treatment has relied upon iron (Fe) and aluminium (Al) salts throughout the last century to provide the bulk removal of contaminants from source waters containing natural organic matter (NOM). However, there is now a need for improved treatment of these waters as their quality deteriorates and water quality standards become more difficult to achieve. Alternative coagulant chemicals offer a simple and inexpensive way of doing this. In this work a novel zirconium (Zr) coagulant was compared against traditional Fe and Al coagulants. The Zr coagulant was able to provide between 46 and 150% lower dissolved organic carbon (DOC) residual in comparison to the best traditional coagulant (Fe). In addition floc properties were significantly improved with larger and stronger flocs forming when the Zr coagulant was used with the median floc sizes being 930 mu m for Zr; 710 mu m for Fe and 450 mu m for Al. In pilot scale experiments, a similar improved NOM and particle removal was observed. The results show that when optimised for combined DOC removal and low residual turbidity, the Zr coagulant out-performed the other coagulants tested at both bench and pilot scale. (C) 2012 Elsevier Ltd. All rights reserved.