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首页> 外文期刊>Separation and Purification Technology >Removal of organic contaminants from soils by an electrokinetic process: The case of molinate and bentazone. Experimental and modeling
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Removal of organic contaminants from soils by an electrokinetic process: The case of molinate and bentazone. Experimental and modeling

机译：通过电动过程去除土壤中的有机污染物：lin酸盐和苯达松。实验与建模

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The herbicides molinate and bentazone are used in paddy rice fields. Their behaviour in soils when submitted to an electric field was studied and the applicability of the electrokinetic (EK) process in soil remediation was evaluated. Three soils were used and nine EK experiments were carried out at a laboratory scale. A one-dimensional model is developed for simulating the EK treatment of soils containing the herbicides. The model reproduces satisfactorily the experimental data of cumulative volumes removed towards the anode and the cathode compartments, as well as the difference between catholyte and anolyte cumulative volumes, showing that the electroosmotic flow (EOF) is very sensible to soil pH. The experimental results show that the EK process is able to mobilize molinate and bentazone from soils, and remove them from soil solution. Molinate seems to be mobilized preferentially to the cathode compartment. The model also satisfactorily reproduces the experimental data. The highest quantities of molinate move towards the catholyte, particularly when the EOF is kept constant, allowing molinate to be constantly swept towards it. Bentazone also shows a high decay from soil, being mobilized towards both electrode compartments. The results point towards a relationship between the differential pH in the catholyte and anolyte, and the bentazone decay. The model shows that bentazone is mobilized towards the anolyte in higher current intensity conditions, because there is a predominant electromigration (EM) movement of enolate towards the anode compartment, against the electroosmotic transport of bentazone towards cathode, whereas in lower intensity conditions the opposite occurs. This happens because the EOF grows less than EM, when current intensity is duplicated.
机译：禾本科杀真菌剂molinate和bentazone用于水稻田。研究了它们在电场作用下在土壤中的行为，并评估了电动（EK）过程在土壤修复中的适用性。使用了三种土壤，并在实验室规模下进行了九次EK实验。建立了一个一维模型来模拟含除草剂的土壤的EK处理。该模型令人满意地再现了向阳极室和阴极室去除的累积体积的实验数据，以及阴极电解液和阳极电解液的累积体积之间的差异，表明电渗流（EOF）对土壤pH非常敏感。实验结果表明，EK工艺能够从土壤中迁移出lin酸盐和苯达松，并将其从土壤溶液中去除。 lin酸盐似乎优先转移到阴极室。该模型还可以令人满意地重现实验数据。尤其是当EOF保持恒定时，最高量的lin酸盐会向阴极电解液移动，使mo酸盐不断向其扫去。 Bentazone还显示出从土壤中大量腐烂，被移向两个电极室。结果表明，阴极电解液和阳极电解液中的pH值差异与苯达松衰减之间的关系。该模型显示，在较高电流强度条件下，bendazone被迁移至阳极液，因为烯醇盐主要向阳极区室移动，而苯酚zone向阴极的电渗迁移却相反，而在较低强度条件下，则发生相反的变化。 。发生这种情况是因为当复制电流强度时，EOF的增长小于EM。

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