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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Chromate adsorption in a transformed red mud permeable reactive barrier using electrokinesis
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Chromate adsorption in a transformed red mud permeable reactive barrier using electrokinesis

机译：电动分解法在转化的红泥可渗透反应性屏障中吸附铬酸盐

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摘要

Electrokinetic removal of chromium from artificially contaminated clayey soil in a bench-scale cell was enhanced by a reactive barrier (RB) of transformed Red Mud (TRM, BAUXSOL) fitted near the anode. When using 0.75 wt% of TRM in a soil spiked up to a Cr (VI) concentration of 1000 mg/kg dry weight, about 54 wt% of total Cr was removed after 6 days, as compared to only 36 wt% from the control cell without TRM RB. Increasing the duration of the treatment up to 12 days and using 1.5 wt% of TRM resulted in the increase of the above mentioned removal efficiencies up to 93 wt% and 57 wt%, respectively. The reduction of Cr (VI) into less mobile Cr (III) was limited by the TRM RB; in fact, lower reduction percentages for the tests with TRM RB as compared to the tests without were observed (respectively, 42% versus 72% for 6 days test, and 60% versus 93% for 12 days test). The obtained results show that Cr (VI) removal efficiency is proportional to the duration of the treatment and enhanced by the development of favorable pH conditions caused by the activity of the anodic TRM RB. It is suggested that electrokinesis may increase the efficiency of metal-oxyanion adsorption on TRM, as well as that the use of a TRM RB may improve the efficiency of contaminated soil remediation by means of electrokinesis.
机译：通过安装在阳极附近的转化红泥（TRM，BAUXSOL）的反应性势垒（RB）增强了在台式规模的电解池中从人工污染的粘性土壤中去除铬的电动势。当在Cr（VI）浓度达到1000 mg / kg干重的土壤中使用0.75 wt％的TRM时，六天后去除了约54 wt％的总Cr，相比之下，对照中只有36 wt％没有TRM RB的电池。将处理持续时间延长至12天，并使用1.5 wt％的TRM导致上述去除效率分别提高至93 wt％和57 wt％。 TRM RB限制了将Cr（VI）还原为流动性较低的Cr（III）。实际上，与不使用TRM RB的测试相比，使用TRM RB的测试减少的百分比更低（分别为6天测试为42％对72％，而12天测试为60％对93％）。获得的结果表明，Cr（VI）的去除效率与处理时间成正比，并且由于阳极TRM RB的活性引起的有利pH条件的发展而提高。有人提出，电动分离可以提高金属氧阴离子在TRM上的吸附效率，以及使用TRM RB可以通过电动分离提高土壤污染修复的效率。

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