Degradation of BTEX compounds under iron-reducing conditions in contaminated aquifer microcosms

被引:23
作者
Botton, Sabrina [1 ]
Parsons, John R. [1 ]
机构
[1] Univ Amsterdam, Inst Biodivers & Ecosyst Dynam, NL-1018 WV Amsterdam, Netherlands
关键词
BTEX; biodegradation; aquifer; iron reduction;
D O I
10.1897/06-004R.1
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The potential for benzene, toluene, ethylbenzene, and xylenes (BTEX) degradation was investigated in microcosms inoculated with sediment and groundwater from a polluted iron-reducing aquifer. Benzene, toluene, and each of the three xylene isomers were degraded by the intrinsic microorganisms under iron-reducing conditions, but there was no removal of ethylbenzene. This work provides the first evidence for para-xylene degradation by dissimilatory iron-reducing bacteria. Microcosms adapted to benzene, toluene, or m-xylene were subsequently exposed to a different BTEX compound, which was degraded without lag phase, suggesting that the same group of bacteria could be involved in the removal of more than one BTEX compound. Furthermore, when microcosms were exposed to a mixture of BTEX, concurrent degradation of benzene and toluene, but not of meta-xylene and ethylbenzene, was observed. These results suggest that, under the influence of the plume of pollution, an iron-reducing microbial community able to degrade multiple aromatic compounds has developed.
引用
收藏
页码:2630 / 2638
页数:9
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