Response to starvation and microbial community composition in microbial fuel cells enriched on different electron donors
Journal article, 2019

In microbial fuel cells (MFCs), microorganisms generate electrical current by oxidizing organic compounds. MFCs operated with different electron donors harbour different microbial communities, and it is unknown how that affects their response to starvation. We analysed the microbial communities in acetate- and glucose-fed MFCs and compared their responses to 10 days starvation periods. Each starvation period resulted in a 4.2 +/- 1.4% reduction in electrical current in the acetate-fed MFCs and a 10.8 +/- 3.9% reduction in the glucose-fed MFCs. When feed was resumed, the acetate-fed MFCs recovered immediately, whereas the glucose-fed MFCs required 1 day to recover. The acetate-fed bioanodes were dominated by Desulfuromonas spp. converting acetate into electrical current. The glucose-fed bioanodes were dominated by Trichococcus sp., functioning as a fermenter, and a member of Desulfuromonadales, using the fermentation products to generate electrical current. Suspended biomass and biofilm growing on non-conductive regions within the MFCs had different community composition than the bioanodes. However, null models showed that homogenizing dispersal of microorganisms within the MFCs affected the community composition, and in the glucose-fed MFCs, the Trichococcus sp. was abundant in all locations. The different responses to starvation can be explained by the more complex pathway requiring microbial interactions to convert glucose into electrical current.

Author

Soroush Saheb Alam

Chalmers, Biology and Biological Engineering, Industrial Biotechnology

Frank Persson

Chalmers, Architecture and Civil Engineering, Water Environment Technology

Britt-Marie Wilen

Chalmers, Architecture and Civil Engineering, Water Environment Technology

Matte Hermansson

University of Gothenburg

Oskar Modin

Chalmers, Architecture and Civil Engineering, Water Environment Technology

MICROBIAL BIOTECHNOLOGY

1751-7915 (ISSN)

Vol. 12 5 962-975

Microbial electrosynthesis - a fundamental investigation of new respiratory pathways

Swedish Research Council (VR), 2013-01-01 -- 2016-12-31.

Subject Categories

Microbiology

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1111/1751-7915.13449

PubMed

31228355

More information

Latest update

11/3/2019