Electrocatalytic dechlorination of 2,4-dichlorophenol in bioelectrochemical systems
In this work, the cathodic electro-dechlorination of 2,4-DCP in a Microbial Fuel Cell (MFC) was studied. To do that, an MFC externally connected with a 120 Ω load was operated by feeding a synthetic wastewater with 300 ppm of 2,4-DCP to the abiotic cathode compartment and sodium acetate to the bioti...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Universidad de Castilla-La Mancha |
| Repositorio: | RUIdeRA. Repositorio Institucional de la UCLM |
| OAI Identifier: | oai:ruidera.uclm.es:10578/29343 |
| Acceso en línea: | https://doi.org/10.1016/j.jelechem.2020.114731 http://hdl.handle.net/10578/29343 |
| Access Level: | acceso abierto |
| Palabra clave: | Bioelectrochemical system Microbial fuel cell Organochlorines 2,4-Dichlorophenol Dechlorination Electro-reductive dehalogenation |
| Sumario: | In this work, the cathodic electro-dechlorination of 2,4-DCP in a Microbial Fuel Cell (MFC) was studied. To do that, an MFC externally connected with a 120 Ω load was operated by feeding a synthetic wastewater with 300 ppm of 2,4-DCP to the abiotic cathode compartment and sodium acetate to the biotic anode with electroactive bacteria. During the experiments, all the intermediates (2-chlorophenol and 4-chlorophenol) and final products (phenol and Cl−) from the dechlorination of 2,4-DCP were monitored. Results show that the bio-assisted electroreductive treatment achieved a cathodic dechlorination yield of a 57% after 24 h, which increases up to 88% after 72 h. In addition, because of the dechlorination of 2,4-DCP, the biodegradability of the synthetic wastewater, expressed as the ratio BOD/COD, was increased from negative values (corresponding to toxic effluents) up to 0.568. Meanwhile, the toxicity decreased drastically, with EC50 values that increased from 0.021 to 0.228 mmol L−1. Operation current densities during the bio-assisted electro-dehalogenation process were significant and decreased from initial values of 0.14 down to 0.04 mA cm−2. These results indicate that the bioelectrochemical technology can produce small amounts of energy while dechlorinating an extremely hazardous waste. |
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