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 m3/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.

Draft Genome of the Arthrobacter sp. Strain Edens01

“…Arthrobacter , a bacterial genus frequently encountered in soil, has the capacity to metabolize numerous recalcitrant compounds ( 1 ), and is hence a valuable contributor to natural-attenuation-based, and engineered bioremediation schemes in multiple environments including groundwater ( 2 , 3 ), crude-oil fields ( 4 ), and soil ( 5 ). Compounds that have been demonstrated to be metabolized by Arthrobacter spp.…”