Microbiological reduction of hexavalent chromium by indigenous chromium-resistant bacteria in sand column experiments |
| |
Authors: | Sung-Eun Lee Jong-Un Lee Hyo-Taek Chon Jin-Soo Lee |
| |
Institution: | (1) Research Institute of Engineering Science, Seoul National University, Seoul, 151-744, South Korea;(2) Department of Geosystem Engineering, Chonnam National University, Gwangju, 500-757, Korea;(3) Department of Energy Resources Engineering, Seoul National University, Seoul, 151-744, Korea;(4) Technology Research Center, Mine Reclamation Corporation, Seoul, 110-727, Korea |
| |
Abstract: | Indigenous bacteria that are resistant to high concentrations of Cr(VI) were isolated from a Cr-contaminated sediment. Sand
column experiments were conducted using the isolated bacteria to investigate microbial effects on Cr(VI) reduction in open
systems that simulated subsurface conditions. The indigenous Cr-resistant bacteria appeared to reduce Cr(VI) in the column
experiments. When 12 mg/L of Cr(VI) was injected into the columns, the removal efficiencies of Cr(VI) by the isolated bacteria
were 39.1%, 62.5%, and 63.6% at 24, 48, and 72 h retention times of Cr(VI) solution, respectively. These results imply that
the linear velocity of groundwater or pore water should be less than 0.63 cm/h for effective removal of Cr(VI) in subsurface
conditions. In comparison, the noninoculated control column did not show a significant variation in dissolved Cr(VI) concentration.
The results indicated that reduction of Cr(VI) was occurring in the column due to the activity of the indigenous bacteria. |
| |
Keywords: | Indigenous bacteria Cr(VI) Column experiment Reduction |
本文献已被 PubMed SpringerLink 等数据库收录! |
|