Reductive dechlorination of chlorofluorocarbons and hydrochlorofluorocarbons in sewage sludge and aquifer sediment microcosms

Balsiger, Christian; Holliger, Christof; Höhener, Patrick

doi:10.1016/j.chemosphere.2005.02.087

Cited by 27 publications

(33 citation statements)

References 45 publications

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“…The degradation pathway of HCFC-141b was not investigated. Balsiger et al (2005) observed degradation of HCFC-141b in microcosms inoculated with contaminated sediment whereas no transformation was observed in microcosms inoculated with sewage sludge. In the experiments reported by Balsiger Fig.…”

Section: Compoundcontrasting

confidence: 49%

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Release and fate of fluorocarbons in a shredder residue landfill cell: 1. Laboratory experiments

et al. 2010

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Section: Compoundcontrasting

confidence: 49%

“…Defluorination (i.e., rupture of the carbon-fluorine bond) has only rarely been observed, and seems to require extreme reducing conditions (Key et al, 1997). Also Balsiger et al (2005) did not report any degradation of HFC-134a in microcosms inoculated with sludge or sediment.…”

Section: Compoundmentioning

confidence: 87%

Release and fate of fluorocarbons in a shredder residue landfill cell: 1. Laboratory experiments

et al. 2010

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“…Etna (Italy). The excess of HCFCs measured in the Solfatara soil gases cannot be caused by their production from biotransformation of CFCs (Balsinger et al, 2005, and references therein), as the HCFCs/CFCs ratios are higher at lower Ar 2 /CO 2 ratios (Fig. 9), i.e., at increasing contribution from the hydrothermal source.…”

Section: Halocarbonsmentioning

confidence: 96%

Volatile organic compounds (VOCs) in soil gases from Solfatara crater (Campi Flegrei, southern Italy): Geogenic source(s) vs. biogeochemical processes

Tassi

Venturi

Cabassi

et al. 2015

Applied Geochemistry

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“…Balsiger et al (19) observed inhibition of methane production in sediment microcosms supplemented with CFC-11. In addition, CFC-11 was not completely consumed and no further conversion of HCFC-21 to HCFC-31 occurred.…”

Section: Degradation Of Bas Under Methanogenic Conditionsmentioning

confidence: 98%

Attenuation of Fluorocarbons Released from Foam Insulation in Landfills

Scheutz

Dote

Fredenslund

et al. 2007

Environ. Sci. Technol.

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Chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and hydrofluorocarbons (HFCs) have been used as blowing agents (BAs) for foam insulation in home appliances and building materials, which after the end of their useful life are disposed of in landfills. The objective of this project was to evaluate the potential for degradation of BAs in landfills, and to develop a landfill model, which could simulate the fate of BAs in landfills. The investigation was performed by use of anaerobic microcosm studies using different types of organic waste and anaerobic digested sludge as inoculum. The BAs studied were CFC-11, CFC-12, HCFC-141b, HFC-134a, and HFC-245fa. Experiments considering the fate of some of the expected degradations products of CFC-11 and CFC-12 were included like HCFC-21, HCFC-22, HCFC-31, HCFC-32, and HFC-41. Degradation of all studied CFCs and HCFCs was observed regardless the type of waste used. In general, the degradation followed first-order kinetics. CFC-11 was rapidly degraded from 590 microg L(-1) to less than 5 microg L(-1) within 15-20 days. The degradation pattern indicated a sequential production of HCFC-21, HCFC-31, and HFC-41. However, the production of degradation products did not correlate with a stoichiometric removal of CFC-11 indicating that other degradation products were produced. HCFC-21 and HCFC-31 were further degraded whereas no further degradation of HFC-41 was observed. The degradation rate coefficient was directly correlated with the number of chlorine atoms attached to the carbon. The highest degradation rate coefficient was obtained for CFC-11, whereas lower rates were seen for HCFC-21 and HCFC-31. Equivalent results were obtained for CFC-12. HCFC-141b was also degraded with rates comparable to HCFC-21 and CFC-12. Anaerobic degradation of the studied HFCs was not observed in any of the experiments within a run time of up to 200 days. The obtained degradation rate coefficients were used as input for an extended version of an existing landfill fate model incorporating a time dependent BA release from co-disposed foam insulation waste. Predictions with the model indicate that the emission of foam released BAs may be strongly attenuated by microbial degradation reactions. Sensitivity analysis suggests that there is a need for determination of degradation rates under more field realistic scenarios.

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Reductive dechlorination of chlorofluorocarbons and hydrochlorofluorocarbons in sewage sludge and aquifer sediment microcosms

Cited by 27 publications

References 45 publications

Release and fate of fluorocarbons in a shredder residue landfill cell: 1. Laboratory experiments

Release and fate of fluorocarbons in a shredder residue landfill cell: 1. Laboratory experiments

Volatile organic compounds (VOCs) in soil gases from Solfatara crater (Campi Flegrei, southern Italy): Geogenic source(s) vs. biogeochemical processes

Attenuation of Fluorocarbons Released from Foam Insulation in Landfills

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