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首页> 外文期刊>Journal of Environmental Engineering >Comparison of potassium permanganate and hydrogen peroxide as chemical oxidants for organically contaminated soils
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Comparison of potassium permanganate and hydrogen peroxide as chemical oxidants for organically contaminated soils

机译：高锰酸钾和过氧化氢作为有机污染土壤化学氧化剂的比较

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Laboratory experiments were completed to compare the treatment efficiency of KMnO4 with H2O2 (alone or with amendments) for sand and silty clay soil contaminated with either a mixture of volatile organic compounds (VOCs) [trichloroethylene (TCE), tetrachloroethene (PCE), and 1,1,1-trichloroethane (TCA)] or semivolatile organic compounds (SVOCs) (naphthalene, phenanthrene, and pyrene). The relatively treatment effects of soil type, oxidant loading rate and dosing, and reaction period, as well as the use of surfactant or iron amendments and pH adjustment were examined using batch experiments with contaminated soil slurries. When KMnO4 was applied to low organic carbon, acidic, or alkaline soils, at loading rates of 15-20 g/kg it was found to degrade consistently 90% or more of the alkene VOCs (TCE and PCE) and 99% of the polyaromatic SVOCs (naphthalene, pyrene, and phenanthrene). H2O2 was more sensitive to contaminant and soil type and VOC treatment efficiencies were somewhat lower as compared with KMnO4 under comparable conditions, particularly with the sandy soil and even when supplemental iron was added. In clay soil, H2O2 with iron addition degraded over 90% of the SVOCs present compared with near zero in sandy soil, unless the pH was depressed to pH 3 and iron amendments were increased, whereby the treatment efficiency in the sandy soil was increased slightly. With both H2O2 and KMnO4, treatment efficiency increased to varying degrees as the oxidant loading rate (g/kg) and reaction time (h) were increased. Multiple oxidant additions or surfactant addition were not found to have any significant effect on VOC treatment efficiency. Also, very limited TCA treatment was observed with either H2O2 Or KMnO4. [References: 39]
机译：完成了实验室实验，比较了KMnO4和H2O2（单独或改良）对被挥发性有机化合物[VOC] [三氯乙烯（TCE），四氯乙烯（PCE）和1 ，1,1-三氯乙烷（TCA）]或半挥发性有机化合物（SVOC）（萘，菲和pyr）。通过使用污染土壤泥浆的分批实验，研究了土壤类型，氧化剂的添加量和剂量以及反应时间的相对处理效果，以及使用表面活性剂或铁的改性剂和调节pH值。当将KMnO4应用于低有机碳，酸性或碱性土壤时，负载率为15-20 g / kg时，它会持续降解90％或以上的烯烃VOC（TCE和PCE）和99％的多芳烃SVOC（萘，pyr和菲）。在相当的条件下，与KMnO4相比，H2O2对污染物和土壤类型更敏感，并且VOC处理效率略低，特别是在沙质土壤中，甚至在添加铁的情况下。在粘土土壤中，除非将pH降低至pH 3并增加铁的添加量，否则添加铁的H2O2会比存在沙质土壤中接近零的SVOCs降解近90％，从而使在沙土中的处理效率略有提高。使用H2O2和KMnO4时，处理效率随着氧化剂负载率（g / kg）和反应时间（h）的增加而不同程度地提高。未发现添加多种氧化剂或添加表面活性剂对VOC处理效率有任何重大影响。同样，用H2O2或KMnO4观察到的TCA处理非常有限。 [参考：39]

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