2026-04-13T03:08:14Zhttps://recercat.cat/oai/request

oai:recercat.cat:10256/208212024-06-18T12:07:01Zcom_2072_452955com_2072_2054col_2072_453062

Electro-cultivation of hydrogen-oxidizing bacteria to accumulate ammonium and carbon dioxide into protein-rich biomass Pous Rodríguez, Narcís Balaguer i Condom, Maria Dolors Matassa, Silvio Chiluiza-Ramos, Paola Bañeras Vives, Lluís Puig Broch, Sebastià Bioelectroquímica Bioelectrochemistry Bioremediació Bioremediation Hydrogen-oxidizing bacteria (HOBs) are prime candidates for the sustainable production of microbial protein because of their high nutritional value and simple metabolic requirements, which could allow a simple resource recycling of NH4+ and CO2 into a valuable product. The modality of hydrogen production/supply to HOBs represents a challenge. In this work, bioelectrochemical hydrogen and oxygen productions were coupled with HOBs cultivation in the same reactor. Using this approach, the protein content was 59 ± 8% with Hydrogenophaga and Xanthobacter as the most abundant HOBs. Biomass concentration was found to be dependent of the current density with bulk liquid biomass increasing between 101 and 124 mg TSS·L−1 for an increase of 0.1 mA·cm−2. Electrodes directly immersed in the bioreactor promoted biofilm formation on the electrode surface, which could become an attractive alternative for biomass harvesting. The results of this work establish a novel proof-of-concept for bio-electro production of microbial protein This research was carried out in the project “RITA – urban cycle ResIlient To pAndemics) funded by AGAUR (ref. 2020PANDE00176). The authors acknowledge the technical support of Ms. Sandra Cano and Mr. Juan José Murga. S.P. is a Serra Hunter Fellow (UdG-AG-575) and acknowledges the funding from the ICREA Academia award. LEQUIA (2017-SGR-1552) and Ecoaqua (2017-SGR-548) have been recognized as consolidated research groups by the Catalan Government Open Access funding provided thanks to the CRUE-CSIC agreement with Elsevier 2024-06-18T12:07:01Z 2024-06-18T12:07:01Z 2024-06-18T12:07:01Z 2022-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion peer-reviewed http://hdl.handle.net/10256/20821 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.biteb.2022.101010 info:eu-repo/semantics/altIdentifier/eissn/2589-014X Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess Elsevier Bioresource Technology Reports, 2022, vol. 18, art.núm. 101010 Articles publicats (D-EQATA)