title: Natural attenuation model and biodegradation for 1,1,1-trichloroethane contaminant in shallow groundwater.
abstract: 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 × 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 m(3)/kg and 0.0045 d(-1). The contamination plume was predicted to diminish and the maximum concentration of TCA decreased to 280 μg/L. The bacterial community during TCA degradation in groundwater belonged to Trichococcus, Geobacteraceae, Geobacter, Mucilaginibacter, and Arthrobacter.
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology , Shanghai, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Lu
authors.affiliation: Shanghai Academy of Environmental Sciences , Shanghai, China.
authors.forename: Rui-Li
authors.initials: RL
authors.lastname: Zhu
authors.affiliation: Shanghai Academy of Environmental Sciences , Shanghai, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Yang
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology , Shanghai, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology , Shanghai, China.
authors.forename: Yong-Di
authors.initials: YD
authors.lastname: Liu
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology , Shanghai, China.
authors.forename: Shu-Guang
authors.initials: SG
authors.lastname: Lu
authors.affiliation: Shanghai Engineering Research Center of Contaminated Sites Remediation, Shanghai Institute for Design and Research on Environmental Engineering , Shanghai, China.
authors.forename: Qi-Shi
authors.initials: QS
authors.lastname: Luo
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology , Shanghai, China.
authors.forename: Kuang-Fei
authors.initials: KF
authors.lastname: Lin
keywords: 1,1,1-trichloroethane; bacterial communities; contaminated groundwater; dechlorination; natural attenuation