Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (5): 1465-1472.doi: 10.13278/j.cnki.jjuese.20170198

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Geochemical Characteristics of Natural Attenuation in a Carbon Tetrachloride Contaminated Site

Ding Yifan1, Hao Guang2, Liu Benhua3, Zhang Ziming1, Yang Xinxin1, Liu Mingzhu1   

  1. 1. School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China;
    2. Yunnan Design Institute Group Survey Institute, Kunming 650223, China;
    3. School of Resources and Environment, University of Jinan, Jinan 250022, China
  • Received:2018-01-29 Published:2018-11-20
  • Supported by:
    Supported by National Natural Science Foundation of China(41572225)

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Abstract: In order to provide a theoretical basis for the treatment design of a carbon tetrachloride(CT) contaminated site in the northern China, based on the sampling work and the geochemical reductive dechlorination process, we selected sulfate, ferrous iron, chloridion, trichloromethane, and bicarbonate as the target components, and compared the differences of the mass concentration between the selected components in the central and the outer part of the CT plume to analyze the geochemical characteristics of natural restoration of the site. The results show that there is a clear spatial correlation among the aforementioned components in the central part of the pollution plume. That is, the mass concentration of the reactant sulfate decreased obviously with the significant increases of the proportion of the product's divalent iron and the concentration of the degradation product chloride ion and chloroform correspondingly. Chloridion and trichloromethane, as dechlorination products, rise considerably with the decrease of bicarbonate. The relationship described above indicates the occurrence of the degradation of CT. The analysis of geochemical characteristics demonstrates that the site has an appreciable natural attenuation potential.

Key words: groundwater contamination, carbon tetrachloride, natural attenuation, reductive dechlorination

CLC Number: 

  • P641.3
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