The effect of organic carbon on the sequential reductive dehalogenation of tetrachloroethylene in landfill leachates
| Autor: | Joseph G. Leahy, Gina S. Shreve |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Total organic carbon
Environmental Engineering Trichloroethylene Chemistry Ecological Modeling Tetrachloroethylene chemistry.chemical_element Contamination Pollution Vinyl chloride chemistry.chemical_compound Environmental chemistry Leachate Microcosm Waste Management and Disposal Carbon Water Science and Technology Civil and Structural Engineering |
| Zdroj: | Water Research. 34:2390-2396 |
| ISSN: | 0043-1354 |
| DOI: | 10.1016/s0043-1354(99)00389-9 |
| Popis: | The effect of organic carbon content on the sequential reductive dehalogenation of tetrachloroethylene (PCE) in landfill leachates was studied using anaerobic microcosms. Microcosms were constructed using leachates from adjacent landfill cells which differed in age and organic carbon content. The landfill which was sampled had no history of contamination with chloroaliphatic (CAH) compounds. Dehalogenation was measured in both unamended leachate and in leachate supplemented with a mixture of organic carbon compounds. Results showed that significant degradation of PCE occurred within 14 days in all cases, and that most or all of the PCE was dehalogenated to TCE, cis -1,2-DCE, and/or vinyl chloride by the 30th day. The extent of dehalogenation was correlated with the availability or quality of organic carbon in the leachates, as measured by BOD analysis. Supplementation with exogenous carbon promoted degradation in the low carbon leachate from the older landfill cell, but not the higher carbon leachate from the younger cell. Conversely, accumulation of cis -1,2-DCE occurred in the unsupplemented and supplemented leachate from the younger cell, but not in supplemented leachate from the older cell. In general, our findings show that landfill communities may be well adapted for the degradation of CAH contaminants, even without prior contamination by these compounds, and that the amount of organic carbon able to serve as an electron donor may be the most important factor influencing rates of CAH removal via dehalogenation. Moreover, supplementation with exogenous sources of organic carbon appears to be a viable method for enhancing rates of CAH degradation in carbon-limited landfills. |
| Databáze: | OpenAIRE |
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