Diverse dechlorinators and dechlorination genes enriched through amendment of chlorinated natural organic matter fractions
| Autor: | Paige J. Novak, Hanna R. Temme |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Halogenation
Amendment Fraction (chemistry) 010501 environmental sciences Management Monitoring Policy and Law 01 natural sciences 03 medical and health sciences Hydrolysis Environmental Chemistry 0105 earth and related environmental sciences chemistry.chemical_classification 0303 health sciences Bacteria biology 030306 microbiology Chemistry Public Health Environmental and Occupational Health Sediment General Medicine Electron acceptor Contamination biology.organism_classification Polychlorinated Biphenyls Trichloroethylene Biodegradation Environmental Environmental chemistry Haloalkane dehalogenase |
| Zdroj: | Environmental Science: Processes & Impacts. 22:595-605 |
| ISSN: | 2050-7895 2050-7887 |
| DOI: | 10.1039/c9em00499h |
| Popis: | In uncontaminated environments, chlorinated natural organic matter (Cl-NOM) can act as an electron acceptor for organohalide-respiring bacteria. It is unknown, however, whether different types of Cl-NOM are preferentially dechlorinated or whether enrichment with Cl-NOM affects the ability of bacteria to dechlorinate contaminants. In this research NOM was extracted from sediment, fractionated based on hydrophobicity, and either amended to polychlorinated biphenyl-contaminated soil directly or chlorinated and then amended to soil. Amendments of the least hydrophobic Cl-NOM fraction were dechlorinated most rapidly, followed by the moderately hydrophobic Cl-NOM fraction. Soil that had been enriched on the moderately hydrophobic fraction of Cl-NOM was also capable of faster dechlorination of the contaminants trichloroethene and tetrachlorobenzene. Community analysis of the soil during enrichment showed that some known organohalide-respiring bacteria were present and may have played a role in dechlorination; nevertheless, many bacteria appeared to be enriched during both Cl-NOM and contaminant dechlorination. In addition, the quantities of two haloalkane dehalogenase genes increased during enrichment on Cl-NOM. These results show for the first time that Cl-NOM can prime contaminant dechlorination and also suggest that hydrolytic dechlorination processes were involved in both Cl-NOM and contaminant dechlorination. |
| Databáze: | OpenAIRE |
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