Co-contaminant effects on 1,4-dioxane biodegradation in packed soil column flow-through systems
| Autor: | Nicholas W. Johnson, Yu Miao, Shaily Mahendra, Baohua Gu, Linduo Zhao, Alexandra Polasko, Xia Lu, Ziming Yang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Bioaugmentation Halogenation Health Toxicology and Mutagenesis 030106 microbiology chemistry.chemical_element 010501 environmental sciences Toxicology 01 natural sciences Dioxanes Soil 03 medical and health sciences chemistry.chemical_compound Biotransformation Reductive dechlorination Groundwater 0105 earth and related environmental sciences Chemistry General Medicine 1 4-Dioxane Biodegradation Pollution Copper Trichloroethylene Biodegradation Environmental Environmental chemistry Degradation (geology) Water Pollutants Chemical |
| Zdroj: | Environmental Pollution. 243:573-581 |
| ISSN: | 0269-7491 |
| Popis: | Biodegradation of 1,4-dioxane was examined in packed quartz and soil column flow-through systems. The inhibitory effects of co-contaminants, specifically trichloroethene (TCE), 1,1-dichloroethene (1,1-DCE), and copper (Cu2+) ions, were investigated in the columns either with or without bioaugmentation with a 1,4-dioxane degrading bacterium Pseudonocardia dioxanivorans CB1190. Results indicate that CB1190 cells readily grew and colonized in the columns, leading to significant degradation of 1,4-dioxane under oxic conditions. Degradation of 1,4-dioxane was also observed in the native soil (without bioaugmentation), which had been previously subjected to enhanced reductive dechlorination treatment for co-contaminants TCE and 1,1-DCE. Bioaugmentation of the soil with CB1190 resulted in nearly complete degradation at influent concentrations of 3–10 mg L−1 1,4-dioxane and a residence reaction time of 40–80 h, but the presence of co-contaminants, 1,1-DCE and Cu2+ ions (up to 10 mg L−1), partially inhibited 1,4-dioxane degradation in the untreated and bioaugmented soil columns. However, the inhibitory effects were much less severe in the column flow-through systems than those previously observed in planktonic cultures, which showed near complete inhibition at the same co-contaminant concentrations. These observations demonstrate a low susceptibility of soil microbes to the toxicity of 1,1-DCE and Cu2+ in packed soil flow-through systems, and thus have important implications for predicting biodegradation potential and developing sustainable, cost-effective technologies for in situ remediation of 1,4-dioxane contaminated soils and groundwater. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect