| Title |
Electro-cultivation of hydrogen-oxidizing bacteria to accumulate ammonium and carbon dioxide into protein-rich biomass |
| ID_Doc |
6460 |
| Authors |
Pous, N; Balaguer, MD; Matassa, S; Chiluiza-Ramos, P; Bañeras, L; Puig, S |
| Title |
Electro-cultivation of hydrogen-oxidizing bacteria to accumulate ammonium and carbon dioxide into protein-rich biomass |
| Year |
2022 |
| Published |
|
| DOI |
10.1016/j.biteb.2022.101010 |
| Abstract |
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 Hydro-genophaga 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 & sdot;L1 for an increase of 0.1 mA & sdot;cm2. 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. |
| Author Keywords |
Biocathode; Circular economy; Microbial Electrochemical Technologies; Resource recovery; Bioelectrochemical systems; Power-to-protein |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Emerging Sources Citation Index (ESCI) |
| EID |
WOS:001207673700013 |
| WoS Category |
Biotechnology & Applied Microbiology; Energy & Fuels; Environmental Sciences |
| Research Area |
Biotechnology & Applied Microbiology; Energy & Fuels; Environmental Sciences & Ecology |
| PDF |
https://doi.org/10.1016/j.biteb.2022.101010
|