Microbial electrosynthesis of single cell protein and methane by coupling fast-growing Methanococcus maripaludis with microbial electrolysis cells.

Single cell protein (SCP) is a promising alternative protein source, as its production bypasses the disadvantages of animal protein production in industrial agriculture. Coupling a fast-growing hydrogen consuming organism with microbial electrolysis cells (MECs) could be a viable method for SCP production. In this study, a fast-growing and protein-rich methanogen, Methanococcus maripaludis was selected as the primary SCP source. The inoculation of M. maripaludis in MECs triggered cell synthesis with methane production. The doubling time measured was 11.2 h and the specific growth rate was 0.062 1/h. The highest SCP production rate was 13.7 mg/L/h. In the dried biomass, the weight of protein was over 60 %. Amino acid profiling of the harvested biomass demonstrated high abundance of essential amino acids. The electron flux analysis indicated that 31.3 % electrons in the electrochemical systems were directed into SCP synthesis. These results illustrated the potential for SCP production by coupling a fast-growing methanogen with MECs. Copyright © 2023 Elsevier Ltd. All rights reserved.

Citation

Luguang Wang, Hong Liu. Microbial electrosynthesis of single cell protein and methane by coupling fast-growing Methanococcus maripaludis with microbial electrolysis cells. Bioresource technology. 2024 Feb;393:130025

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PMID: 37972904

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