...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Environmental Science and Health. A >Perchlorate natural attenuation in a riparian zone
【24h】

Perchlorate natural attenuation in a riparian zone

机译：高氯酸盐在河岸带的自然衰减

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Multiple lines of evidence were used to document the natural attenuation of perchlorate in a shallow alluvial aquifer. In the upgradient, aerobic portion of the aquifer, perchlorate did not biodegrade. However, natural flushing by groundwater flow is reducing perchlorate concentrations in the aquifer over time. Perchlorate concentrations in the source area are expected to meet cleanup criteria in 11 to 27 years without active remedial measures. At the distal end of the plume, perchlorate is rapidly degraded as it migrates upward through organic rich littoral zone sediments. Apparent first-order degradation rates in groundwater were about 0.20 d(-1) and are consistent with laboratory macrocosm rates (0.12 d(-1)). qPCR results show a distinct region of the littoral zone where perchlorate degraders are elevated. The Eh within this zone varies from +0.1 to +0.3 V indicating perchlorate degraders can thrive in moderately oxidizing conditions. The study has shown that (i) there was no apparent perchlorate biodegradation in aerobic aquifer; (ii) perchlorate declines over time in aerobic aquifer due to flushing; (iii) there was a rapid perchlorate attenuation in organic rich littoral zone; and, (iv) qPCR results show large increases in perchlorate degraders in the littoral zone.
机译：多行证据被用于记录浅冲积含水层中高氯酸盐的自然衰减。在含水层的好氧部分中，高氯酸盐没有生物降解。但是，随着时间的流逝，通过地下水自然冲刷会降低含水层中的高氯酸盐浓度。如果不采取积极的补救措施，预计源区中的高氯酸盐浓度将在11至27年内达到净化标准。在羽流的远端，高氯酸盐随着向上迁移穿过富含有机物的沿海区域沉积物而迅速降解。地下水中的表观一级降解速率约为0.20 d（-1），与实验室宏观宇宙速率（0.12 d（-1））一致。 qPCR结果显示了沿岸区的一个明显区域，其中高氯酸盐降解物升高。该区域内的Eh在+0.1至+0.3 V之间变化，表明高氯酸盐降解物可以在中等氧化条件下壮成长。研究表明：（i）好氧含水层中没有明显的高氯酸盐生物降解； （ii）由于冲洗，有氧含水层中的高氯酸盐随时间下降； （iii）富含有机物的沿海区高氯酸盐迅速衰减； （iv）qPCR结果显示，沿海区的高氯酸盐降解物大幅增加。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号