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Chemical Reduction of Hexavalent Chromium Present in Contaminated Soil using a Packed-bed Column Reactor

机译：使用填充床柱反应器化学还原污染土壤中的六价铬

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摘要

Soil samples extracted from a contaminated landfill with hexavalent chromium, Cr(VI), were treated in a packed-bed column reactor applying different reductant solutions under controlled flow conditions. In all cases, the kinetic study concerning removal of Cr(VI) from packed soil revealed the overall process (leaching and redox reaction) is described by pseudo-first order kinetics. The complexity of the process taking place in non-isotropic medium (packed soil) was evidenced by dependence of the overall pseudo-first order kinetic rate constant, k* on treatment time, volumetric flow rate, and composition and concentration of the reductant solution. A phenom-enological equation was proposed in order to represent k* in non-ideal conditions. The comparative study concerning the use of different reductants revealed application of ferrous sulphate, Fe(II), under flow conditions furnished the best results, since in this case the redox process reached a considerable extent and the reduced chromium, Cr(III), was immobilized in packed soil as an insoluble mixed compound.
机译：从六价铬Cr（VI）污染的垃圾填埋场中提取的土壤样品在填充床塔式反应器中进行处理，在受控的流动条件下应用不同的还原剂溶液。在所有情况下，有关从堆积土中去除Cr（VI）的动力学研究表明，整个过程（浸出和氧化还原反应）由拟一级动力学描述。在非各向同性介质（堆积的土壤）中发生的过程的复杂性通过总的拟一级动力学速率常数k *与处理时间，体积流速以及还原剂溶液的组成和浓度的依赖关系得到证明。为了表示非理想条件下的k *，提出了一个现象学方程。有关使用不同还原剂的比较研究表明，在流动条件下使用硫酸亚铁Fe（II）效果最佳，因为在这种情况下氧化还原过程达到了相当大的程度，而还原的铬Cr（III）为作为不溶性混合化合物固定在填充土壤中。

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