研究报告

  • 周艳,姜登登,孔令雅,丁达,邓绍坡,夏菲洋.典型农药污染场地地下水中苯系物监控自然衰减研究[J].环境科学学报,2022,42(7):380-388

  • 典型农药污染场地地下水中苯系物监控自然衰减研究
  • Research on monitored natural attenuation of BTEX in groundwater of a typical pesticide-contaminated site
  • 基金项目:国家重点研发计划(No.2018YFC1803100)
  • 作者
  • 单位
  • 周艳
  • 生态环境部南京环境科学研究所,南京 210042;国家环境保护土壤环境管理与污染控制重点实验室,南京 210042
  • 姜登登
  • 生态环境部南京环境科学研究所,南京 210042;国家环境保护土壤环境管理与污染控制重点实验室,南京 210042
  • 孔令雅
  • 生态环境部南京环境科学研究所,南京 210042;国家环境保护土壤环境管理与污染控制重点实验室,南京 210042
  • 丁达
  • 生态环境部南京环境科学研究所,南京 210042;国家环境保护土壤环境管理与污染控制重点实验室,南京 210042
  • 邓绍坡
  • 生态环境部南京环境科学研究所,南京 210042;国家环境保护土壤环境管理与污染控制重点实验室,南京 210042
  • 夏菲洋
  • 生态环境部南京环境科学研究所,南京 210042;国家环境保护土壤环境管理与污染控制重点实验室,南京 210042
  • 摘要:通过对某农药污染场地地下水中苯系物(BTEX)4年的长期监测数据进行分析,识别了该场地地下水中BTEX浓度的空间分布规律,并研究了场地地下水中BTEX的自然衰减规律.结果表明,地下水BTEX污染程度较重,浓度为0.001~180.52 mg·L-1,平均浓度为13.30 mg·L-1;BTEX浓度和污染羽面积随时间出现波动式变化,但整体仍呈逐渐减小的趋势,表明地下水中BTEX发生了自然衰减;地下水中氧化还原电位(ORP)与BTEX浓度呈显著负相关,说明研究区中BTEX高浓度区域在发生生物降解;研究区BTEX的衰减速率较小,半衰期较长,说明该场地单纯依靠监控自然衰减的修复时间将较长,需要与化学刺激等其他主动修复技术相结合以提高自然衰减效率.
  • Abstract:Based on the analysis of 4-year monitoring data of benzene, toluene, ethylbenzene, and xylene (BTEX) in the groundwater at a pesticide-contaminated site, this study identified the spatial distribution of BTEX in the groundwater and studied the natural attenuation of BTEX in the groundwater at the site. The results showed that the groundwater was severely polluted by BTEX, with the concentration ranging from 0.001 to 180.52 mg·L-1, averaging at 13.30 mg·L-1. Although the concentration of BTEX and the area of the pollution plume have fluctuated with time, they still show a decreasing trend during the whole monitoring period, indicating that BTEX in groundwater has naturally attenuated. The oxidation-reduction potential (ORP) and the BTEX concentration in the groundwater are extremely significantly negatively correlated, which suggested the biodegradation of BETX took place in the heavily polluted area. Additionally, the attenuation rate of BTEX in the study area was relatively small and the half-life of BTEX is relatively long, indicating that it would take a long time to remediate the contaminated site only by monitoring the natural attenuation. Other positive remediation techniques such as chemical stimulation need to be combined to improve the efficiency of natural attenuation.

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