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Optimization of methane gas-liquid mass transfer during biogas-based ectoine production in bubble column bioreactors.
Rodero, María Del Rosario; Pérez, Víctor; Muñoz, Raúl.
Afiliación
  • Rodero MDR; Institute of Sustainable Processes, University of Valladolid, 47011, Valladolid, Spain; Department of Chemical Engineering and Environmental Technology, School of Industrial Engineering. University of Valladolid, Dr. Mergelina s/n., 47011, Valladolid, Spain.
  • Pérez V; Institute of Sustainable Processes, University of Valladolid, 47011, Valladolid, Spain; Department of Chemical Engineering and Environmental Technology, School of Industrial Engineering. University of Valladolid, Dr. Mergelina s/n., 47011, Valladolid, Spain.
  • Muñoz R; Institute of Sustainable Processes, University of Valladolid, 47011, Valladolid, Spain; Department of Chemical Engineering and Environmental Technology, School of Industrial Engineering. University of Valladolid, Dr. Mergelina s/n., 47011, Valladolid, Spain. Electronic address: raul.munoz.torre@uva.es.
J Environ Manage ; 366: 121811, 2024 Aug.
Article en En | MEDLINE | ID: mdl-39002456
ABSTRACT
Nowadays, the utilization of biogas for energy generation is hindered by the declining production costs of solar and wind power. A shift towards the valorization of biogas into ectoine, a highly valuable bioproduct priced at 1000 €â¸±kg-1, offers a novel approach to fostering a more competitive biogas market while contributing to carbon neutrality. This study evaluated the optimization of CH4 gas-liquid mass transfer in 10 L bubble column bioreactors for CH4 conversion into ectoine and hydroxyectoine using a mixed methanotrophic culture. The influence of the empty bed residence time (EBRTs of 27, 54, and 104 min) at different membrane diffuser pore sizes (0.3 and 0.6 mm) was investigated. Despite achieving CH4 elimination capacities (CH4-ECs) of 10-12 g⸱m-3⸱h-1, an EBRT of 104 min mediated CH4 limitation within the cultivation broth, resulting in a negligible biomass growth. Reducing the EBRT to 54 min entailed CH4-ECs of 21-24 g⸱m-3⸱h-1, concomitant to a significant increase in biomass growth (up to 0.17 g⸱L⸱d-1) and reaching maximum ectoine and hydroxyectoine accumulation of 79 and 13 mg⸱gVSS-1, respectively. Conversely, process operation at an EBRT of 27 min lead to microbial inhibition, resulting in a reduced biomass growth of 0.09 g⸱L⸱d-1 and an ectoine content of 47 mg⸱gVSS-1. While the influence of diffuser pore size was less pronounced compared to EBRT, the optimal process performance was observed with a diffuser pore size of 0.6 mm.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Reactores Biológicos / Biocombustibles / Metano Idioma: En Revista: J Environ Manage Año: 2024 Tipo del documento: Article País de afiliación: España Pais de publicación: Reino Unido
Texto completo
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XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Reactores Biológicos / Biocombustibles / Metano Idioma: En Revista: J Environ Manage Año: 2024 Tipo del documento: Article País de afiliación: España Pais de publicación: Reino Unido