Natural attenuation model and biodegradation for 1,1,1-trichloroethane contaminant in shallow groundwater

作者：Lu, Qiang; Zhu, Rui-Li; Yang, Jie; Li, Hui^*; Liu, Yong-Di; Lu, Shu-Guang; Luo, Qi-Shi; Lin, Kuang-Fei

来源：Frontiers in Microbiology, 2015, 6: 839.

DOI：10.3389/fmicb.2015.00839

• 1,1,1-trichloroethane
• contaminated groundwater
• natural attenuation
• bacterial communities
• dechlorination

Natural attenuation is an effective and feasible technology for controlling groundwater contamination. This study investigated the potential effectiveness and mechanisms of natural attenuation of 1,1,1-trichloroethane (TCA) contaminants in shallow groundwater in Shanghai by using a column simulation experiment, reactive transport model, and 16S rRNA gene clone library. The results indicated that the majority of the contaminant mass was present at 2-6 m in depth, the contaminated area was approximately 1000 m x 1000 m, and natural attenuation processes were occurring at the site. The effluent breakthrough curves from the column experiments demonstrated that the effectiveness of TCA natural attenuation in the groundwater accorded with the advection-dispersion-reaction equation. The kinetic parameter of adsorption and biotic dehydrochlorination of TCA was 0.068 m3/kg and 0.0045 d(-1). The contamination plume was predicted to diminish and the maximum concentration of TCA decreased to 280 mu g/L. The bacterial community during TCA degradation in groundwater belonged to Trichococcus, Geobacteraceae, Geobacter, Mucilaginibacter, and Arthrobacter.

• 出版日期2015-8-25
• 单位华东理工大学; 上海市环境科学研究院