Treatment of hydrothermal carbonization process water by electrochemical oxidation: assessment of process performance
[EN] Herein electrochemical oxidation (EO) is proposed as a novel path to treat the process water obtained from hydrothermal carbonization of olive tree pruning. The aim of this work is to analyze the organic matter removal achieved by the treatment along with the identification of the chemical spec...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Universidad de León |
| Repositorio: | BULERIA. Repositorio Institucional de la Universidad de León |
| OAI Identifier: | oai:buleria.unileon.es:10612/23760 |
| Acceso en línea: | https://www.sciencedirect.com/science/article/pii/S0013935122021004 https://hdl.handle.net/10612/23760 |
| Access Level: | acceso abierto |
| Palabra clave: | Energía Ingeniería química Electrochemical oxidation Hydrothermal carbonization Process water 3322.05 Fuentes no Convencionales de Energía 3303 Ingeniería y Tecnología Químicas 3308.07 Eliminación de Residuos |
| Sumario: | [EN] Herein electrochemical oxidation (EO) is proposed as a novel path to treat the process water obtained from hydrothermal carbonization of olive tree pruning. The aim of this work is to analyze the organic matter removal achieved by the treatment along with the identification of the chemical species formed after the electro-oxidation process at different experimental conditions. Three different tests were performed in a boron doped diamond cell, using Na 2 SO 4 and NaCl as supporting electrolytes to compare the results obtained with the raw process water. The organic matter removal was evaluated by means of total organic carbon and chemical oxygen demand, while Gas Chromatography Mass Spectrometry was used to determine the chemical species present before and after the treatment. The addition of a promoter considerably increased the organic matter removal. In fact, the experiments performed using supporting electrolytes showed the best results in terms of organic matter removal compared to the control experiment (30–40% vs. 17%); This reduction agrees with the volatile fatty acids’ measurements. Almost all the chemical species identified in the different feedstocks were partially or totally removed after the EO treatment depending on the experimental conditions. The specific energy consumption and the cost calculated for the treatment is highly dependent on the time of electro-oxidation and the supporting electrolyte used, obtaining values from 1 to 45 € /kg COD removed . All in all, this work suggests an interesting path towards a further utilization of process water from hydrothermal carbonization processes |
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