Soil washing has been widely used together with other remediation techniques to increase the overallremoval efficiency of hydrophobic pollutants. In this study, the combined effects of soil washingfollowed by the electro-Fenton process were investigated. A loamy soil contaminated with fluorene(368.8 mg/kg) was used in a washing process including the non-ionic surfactant polyoxyethylene 20cetyl ether (Brij 58). A total of 222.6 mg/kg fluorene was removed with 1% Brij 58 solution and a soilto-solution ratio of 1/5, which were determined to be the optimum treatment conditions. Both the firstorder, two-compartment model and pseudo-second-order model described fluorene solubilization verywell, implying that fluorene solubilization proceeded in two stages and that the fluorene concentrationgradient in the washing solution influenced the process. Evaluation of Brij 58 adsorption together withfluorene removal revealed that adsorption and the release of organic constituents (Brij 58 anddissolved soil organic constituents) and fluorene from the soil seemed to occur simultaneously. Thetreatment of the Brij washing solution with the electro-Fenton process presented a fluorene removalefficiency of approximately 92.8% with 2% H2O2 and a reaction time of 60 min, a current density of15 mA/cm2and an electrical conductivity of 2 mS/cm. The corresponding total destruction of thewashing solution was approximately 67.6%. The results showed that with proper optimization ofoperational parameters, a strategy for the removal of target contaminants can be accomplished,enabling the reuse of the washing solution.
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机译：土壤洗涤已广泛用于其他修复技术，以提高疏水性污染物的跨度氧化效率。在该研究中，研究了通过电芬顿工艺洗涤的土壤的组合效应。用芴（368.8mg / kg）污染的壤土土壤用于洗涤过程，包括非离子表面活性剂聚氧乙烯20乙醚（Brij 58）。除去总共222.6mg / kg芴，用1％Brij 58溶液和1/5的毒液溶液比例除去，其被确定为最佳的处理条件。第一阶，双隔室模型和伪二阶模型均描述了芴溶解，暗示芴溶解在两个阶段进行，并且洗涤溶液中的芴浓度升级影响了该方法。 BRIJ 58的评估与氟烯脱落一起的吸附表明，吸附和释放有机成分（BRIJ 58 anddarsolved土壤有机成分）和来自土壤的芴似乎同时发生。将Brij洗涤溶液与电芬工艺进行致氟化芴，其芴除去约92.8％，2％H 2 O 2和60分钟的反应时间，电流密度为15 mA / cm 2和2ms / cm的电导率。相应的污水溶液爆裂溶液约为67.6％。结果表明，通过适当的优化参数，可以实现用于去除靶污染物的策略，从而能够再利用洗涤溶液。
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