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首页> 外文期刊>Environmental Science & Technology >Optimization of the Peroxy Acid Treatment of α-Methylnaphthalene and Benzo[a]pyrene in Sandy and Silty-Clay Sediments
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Optimization of the Peroxy Acid Treatment of α-Methylnaphthalene and Benzo[a]pyrene in Sandy and Silty-Clay Sediments

机译：桑迪和粉质粘土沉积物中过氧酸处理α-甲基萘和苯并[a] py的优化

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The majority of polycyclic aromatic hydrocarbons (PAHs) released to the environment come from anthropogenic sources involving the incomplete combustion of organic compounds. Several techniques are available for the degradation of PAHs. Among the abiotic/biotic processes used to degrade PAHs, an alternative strategy utilizing a primary chemical oxidative step to be combined with a biological was created. The degradation of α-methylnaphthalene and benzo[a]pyrene using an advanced oxidation process was optimized over a period of 24 h by varying the ratio of acetic acid to hydrogen peroxide, the compounds that form peroxy acids. The optimization process was performed using sandy and silty-clay sediment types. Gas chromatog-raphy equipped with a flame ionization detector was used to determine the varied rates of degradation depending on acetic acid:hydrogen peroxide ratios and the characteristics of the sediment sample. Reduction of 20-90% of a-methylnaphthalene and benzo[a]pyrene was observed when 2-5 mL of hydrogen peroxide was used, respectively. A peracetic acid solution (e.g., a commercial form of acetic acid and hydrogen peroxide) was used to compare the results from the peroxy acid experiments. In all the experiments, peracetic acid was more reactive than the combination of acetic acid and hydrogen peroxide. Acetic acid, deionized water, and hydrogen peroxide served as controls and demonstrated minimal degradation over the time course study. Therefore, the use of a peroxy acid process to target electron dense pollutants may have a great utility.
机译：释放到环境中的大多数多环芳烃（PAH）来自人为来源，涉及有机化合物的不完全燃烧。有几种技术可用于降解PAH。在用于降解PAHs的非生物/生物过程中，创建了一种将主要的化学氧化步骤与生物结合的替代策略。通过改变乙酸与过氧化氢（形成过氧酸的化合物）的比例，在24小时内优化了使用高级氧化工艺降解α-甲基萘和苯并[a] re的能力。优化过程是使用沙质和粉质粘土沉积物类型进行的。配备有火焰离子化检测器的气相色谱仪用于确定不同的降解速率，具体取决于乙酸：过氧化氢的比例和沉积物样品的特性。当分别使用2-5mL过氧化氢时，观察到α-甲基萘和苯并[a] py的减少20-90％。用过乙酸溶液（例如，商业形式的乙酸和过氧化氢）比较过氧酸实验的结果。在所有实验中，过乙酸比乙酸和过氧化氢的组合更具反应性。醋酸，去离子水和过氧化氢作为对照，在整个时间过程中显示出最小的降解。因此，使用过氧酸工艺来靶向电子致密污染物可能具有很大的实用性。

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