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首页> 外文期刊>Environmental toxicology and chemistry >DEGRADATION AND FORMATION OF POLYCYCLIC AROMATIC COMPOUNDS DURING BIOSLURRY TREATMENT OF AN AGED GASWORKS SOIL
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DEGRADATION AND FORMATION OF POLYCYCLIC AROMATIC COMPOUNDS DURING BIOSLURRY TREATMENT OF AN AGED GASWORKS SOIL

机译：老化汽油污泥处理过程中多环芳族化合物的降解和形成

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The goals of this study were to investigate the relative degradation rates of polycyclic aromatic compounds (PACs) in contaminated soil, and to assess whether persistent oxidation products are formed during their degradation. Samples were taken on five occasions during a pilot-scale bioslurry treatment of soil from a former gasworks site. More than 100 PACs were identified in the soil, including unsubstituted polycyclic aromatic hydrocarbons (PAHs), alkylated PAHs (alkyl-PAHs), hetero-cyclic PACs, and oxygenated PAHs (oxy-PAHs), such as ketones, quinones, and coumarins. During the treatment, the low molecular weight PAHs and heterocyclics were degraded faster than the high molecular weight compounds. The unsubstituted PAHs also appear to have degraded more quickly than the corresponding alkyl-PAHs and nitrogen-containing heterocyclics. No new oxidation products that were not present in the untreated soil were identified after the soil treatment. However, oxy-PAHs that were present in the untreated soil were generally degraded more slowly than the parent compounds, suggesting that they were formed during the treatment or that they are more persistent. Two oxidation products, 1-acenaphthenone and 4-oxapyrene-5-one, were found at significantly higher concentrations at the end of the study. Because oxy-PAHs can be acutely toxic, mutagenic, or carcinogenic, we suggest that this group of compounds should also be monitored during the treatment of PAH-contaminated soil.
机译：这项研究的目的是调查污染土壤中多环芳族化合物（PAC）的相对降解速率，并评估在降解过程中是否形成了持久性氧化产物。在从以前的煤气厂进行的土壤的中试规模生物泥浆处理期间，五次采样。在土壤中鉴定出100多种PAC，包括未取代的多环芳烃（PAH），烷基化的PAH（烷基-PAH），杂环PAC和含氧的PAH（氧-PAH），例如酮，醌和香豆素。在处理过程中，低分子量PAHs和杂环的降解速度比高分子量化合物快。未取代的PAH似乎也比相应的烷基PAH和含氮杂环降解得更快。在土壤处理后，未发现未处理土壤中不存在的新氧化产物。但是，未经处理的土壤中存在的氧-PAHs的降解通常比母体化合物的降解速度更慢，这表明它们是在处理过程中形成的，或者它们更具持久性。在研究结束时，发现了两种氧化产物，即1-ph庚酮和4-氧杂yr烯-5-酮，其浓度明显更高。由于氧基-PAHs可能具有剧毒，致突变性或致癌性，因此我们建议在处理受PAH污染的土壤时也应监测这组化合物。

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