Abstract
The capacity of an anaerobic sediment to achieve the simultaneous biodegradation of phenol and carbon tetrachloride (CT) was evaluated, using humic acids (HA) as redox mediator. The presence of HA in sediment incubations increased the rate of biodegradation of phenol and the rate of dehalogenation (2.5-fold) of CT compared to controls lacking HA. Further experiments revealed that the electron-accepting capacity of HA derived from different organic-rich environments was not associated with their reducing capacity to achieve CT dechlorination. The collected kinetic data suggest that the reduction of CT by reduced HA was the rate-limiting step during the simultaneous biodegradation of phenol and CT. To our knowledge, the present study constitutes the first demonstration of the simultaneous biodegradation of two priority pollutants mediated by HA.
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Abbreviations
- HA:
-
Humic acids
- ETC:
-
Electron-transferring capacity
- TEA:
-
Terminal electron acceptor
- RM:
-
Redox mediators
- AQDS:
-
Anthraquinone-2,6-disulfonate
- CT:
-
Carbon tetrachloride
- CS:
-
Anaerobic sludge from a factory of candies
- PS:
-
Anaerobic sludge from a paper-mill factory
- S:
-
Sediment
- VS:
-
Volatile solids
- VFA:
-
Volatile fatty acids
- AH2QDS:
-
Anthrahydroquinone-2,6-disulfonate
- R 2 :
-
Coefficient of determination
- SCP:
-
Soil of cocoa plantation
- SDF:
-
Soil of deciduous forest in San Luis Potosí, Mexico
- GWC:
-
Compost produced with gardening wastes
- IHSS:
-
International Humic Substance Society
- EAC:
-
Electron accepting capacity
- μEq:
-
Micro-electron equivalents
- CF:
-
Chloroform
- DCM:
-
Dichloromethane
- k d2 :
-
Second-order rate constant
- k d1 :
-
First-order rate constant
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Acknowledgments
The present study was financially supported by the Council of Science and Technology of Mexico (SEP-CONACYT Grants 55045 and 155656) and by the Lettinga Associates Foundation (Lettinga Award 2007). C. M. Martínez-Rodríguez is grateful for the scholarship for PhD studies from CONACyT (Grant 206474). We acknowledge the use of facilities of the National Laboratory of Agricultural, Medical and Environmental Biotechnology (LANBAMA). We thank the technical assistance of M.C. Rocha-Medina, G. Vidriales-Escobar and D. Partida-Gutiérrez.
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Martínez, C.M., Alvarez, L.H. & Cervantes, F.J. Simultaneous biodegradation of phenol and carbon tetrachloride mediated by humic acids. Biodegradation 23, 635–644 (2012). https://doi.org/10.1007/s10532-012-9539-8
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DOI: https://doi.org/10.1007/s10532-012-9539-8