Influence of solution composition and column aging on the reduction of nitroaromatic compounds by zero-valent iron
Influence of solution composition and column aging on the reduction of nitroaromatic compounds by zero-valent iron
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DOI：
10.1016/s0045-6535(00)00385-4
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发表时间：
2001-08-01
期刊：
影响因子：
8.8
通讯作者：
Schwarzenbach, RP
中科院分区：
文献类型：
--
作者：
Klausen, J;Ranke, J;Schwarzenbach, RP
粒状铁用于反应性渗透屏障，用于有机和无机地下水污染物的还原处理。该技术已得到很好的确立，但其长期性能和地下水成分的重要性尚未得到很好的理解。在这里，氯化物，硝酸盐，硅酸盐，和奥德里奇腐殖酸对主Builder铁的反应性的影响进行了研究缺氧条件下使用小填充柱和2-硝基甲苯（2-NT）作为模型污染物。在柱中2-NT最初完全还原成2-氨基甲苯（2-AT）后，可能在传质控制条件下，发现铁的反应性显著降低。在氯化物的存在下，这种降低被减缓，而暴露于硅酸盐导致铁反应性的非常快速的损失。发现硝酸盐强烈干扰氯化物的作用。这些观察结果解释的腐蚀抑制/促进和竞争。我们的研究结果表明，反应性屏障的性能可能会受到强烈的影响，处理后的地下水的组成。(C)2001爱思唯尔科技有限公司版权所有。
Granular iron is used in reactive permeable barriers for the reductive treatment of organic and inorganic groundwater contaminants. The technology is well established, however, its long-term performance and the importance of the groundwater composition are not yet well understood. Here, the influence of chloride, nitrate, silicate, and Aldrich humic acid on the reactivity of Master Builder iron was studied under anoxic conditions using small packed columns and 2-nitrotoluene (2-NT) as a model contaminant. After initially complete reduction of 2-NT to 2-aminotoluene (2-AT) in the column, possibly under mass-transfer controlled conditions, the reactivity of the iron was found to decrease substantially. In the presence of chloride, this decrease was slowed while exposure to silicate resulted in a very quick loss of iron reactivity. Nitrate was found to interfere strongly with the effect of chloride. These observations are interpreted in terms of corrosion inhibition/promotion and competition. Our results suggest that reactive barrier performance may be strongly affected by the composition of the treated groundwater. (C) 2001 Elsevier Science Ltd. All rights reserved.