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首页> 外文期刊>International Journal of Soil, Sediment and Water >Comparison of BTEX Attenuation Rates Under Anaerobic Conditions
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Comparison of BTEX Attenuation Rates Under Anaerobic Conditions

机译：厌氧条件下BTEX衰减率的比较

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Over the last decade data have been published that demonstrate that natural attenuation of hydrocarbons in the subsurface is dominated by anaerobic processes. Some data have indicated that benzene is recalcitrant; some have shown it degrades but at a slower rate than alkyl benzenes (primarily TEX) under anaerobic conditions. Many natural attenuation studies have pointed to the sequential order of attenuation. This paper evaluated data from four sites in the Midwestern U.S. (Illinois, Indiana, Michigan, and Missouri) that explain and contrast existing impressions. Although the actual attenuation rates varied from site to site, primarily dependent upon the relative availability of electron acceptors, data from these sites indicated that attenuation of BTEX compounds under anaerobic conditions is concurrent. The benzene attenuation rate appeared to be a function of the relative abundance of TEX. The ratios of attenuation rates between the compounds, however, appear to be relatively constant within certain brackets. For example, of the BTEX compounds, at the four sites in this study, toluene attenuated at the highest rate followed by benzene which attenuated at average rates between 70 and 80% of toluene, xylenes which attenuated at average rates between 60 and 70% of toluene (which may be dependent upon which xylenes are most abundant), and lastly ethylbenzene which attenuated at average rates 50 to 60% as high as toluene. These were observed at both natural and sulfate-enhanced attenuation sites.
机译：在过去的十年中，已发布的数据表明，地下碳氢化合物的自然衰减主要由厌氧过程决定。一些数据表明苯是难降解的。一些研究表明，它在厌氧条件下的降解速度比烷基苯（主要是TEX）慢，但降解速度较慢。许多自然衰减研究指出了衰减的顺序。本文评估了来自美国中西部四个地点（伊利诺伊州，印第安纳州，密歇根州和密苏里州）的数据，这些数据可以解释和对比现有印象。尽管实际衰减率因位置而异，主要取决于电子受体的相对可用性，但这些位置的数据表明在厌氧条件下BTEX化合物的衰减是同时发生的。苯的衰减速率似乎是TEX相对丰度的函数。然而，化合物之间的衰减率之比在某些范围内似乎相对恒定。例如，在本研究的四个位置的BTEX化合物中，甲苯的衰减速率最高，其次是苯，其平均衰减速率为甲苯的70％至80％，二甲苯的平均衰减速率为甲苯的60％至70％。甲苯（可能取决于最丰富的二甲苯），最后以平均速率衰减50至60％甲苯的乙苯。在天然和硫酸盐增强衰减点都可以观察到这些。

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