ABSTRACT

This work describes the complete decontamination of three parcels of a dump site located in Lomas de Zamora county, Buenos Aires province (Argentina) heavily polluted with hexachorocyclohexane (HCH), where phytoremediation, successful in the surrounding areas, was ineffective. HCH contained in contaminated soil (10 g/kg average) was oxidized with sodium persulfate activated with citric acid chelated Fe(II). This chemical remediation process required treatment in situ in each parcel of approximately 10900 tons total of soil that were mechanically removed and initially mixed with 1750 tons of sodium persulfate. The mixture was then transferred to the excavation site, and 105 tons of ferrous sulfate and 35 tons of citric acid were finally added. The process, started in January 2011 and completed in February 2016, was very effective since chemical remediation average efficiency in the three parcels was higher than 99.99%. To the best of our knowledge this work is the first demonstration that persulfate oxidation activated with citric acid chelated Fe(II) can be successfully applied for field remediation of a relatively large area.

摘要

这项工作描述了对位于布宜诺斯艾利斯省（阿根廷）洛马斯德萨莫拉县的一个垃圾场的三个地块进行的完全净化，该垃圾场被六氯环己烷 (HCH) 严重污染，在周边地区成功的植物修复无效。受污染土壤中所含的 HCH（平均 10 g/kg）被柠檬酸螯合 Fe(II) 激活的过硫酸钠氧化。这种化学修复过程需要就地处理在每个地块中，总共约有 10900 吨土壤被机械去除并最初与 1750 吨过硫酸钠混合。然后将混合物转移到开挖现场，最后加入105吨硫酸亚铁和35吨柠檬酸。该过程于 2011 年 1 月开始，于 2016 年 2 月完成，非常有效，因为三个地块的化学修复平均效率高于 99.99%。据我们所知，这项工作首次证明了用柠檬酸螯合 Fe(II) 激活的过硫酸盐氧化可以成功应用于相对较大区域的现场修复。