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Fermentation
Special Issues
Microbial Redox Control by Microbe–Metal/Electrode Interaction in Bioproduction
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Microbial Redox Control by Microbe–Metal/Electrode Interaction in Bioproduction

A special issue of Fermentation (ISSN 2311-5637). This special issue belongs to the section "Fermentation Process Design".

Deadline for manuscript submissions: closed (31 December 2023) | Viewed by 3521

Special Issue Editor

Dr. Changman Kim

E-Mail Website
Guest Editor
Department of Biotechnology and Bioengineering, Chonnam National University, Gwangju 61188, Republic of Korea
Interests: bioenergy; biorefinery; bioprocss development; fermentation process engineering; metabolic engineering; gas fermentation; microbial consortium; bioelectrochemistry; C1 biorefinery; bioelectrochemical systems; miocrobial fuel cells; bioremediation
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Although biotechnology has recently achieved great advances and opened a new chapter in synthetic biology, there remains a huge productivity gap between chemical and bio-based production. In fact, recent advances in biotechnology have reduced the kinetic barrier through improvements in biocatalytic activity, but not the thermodynamic barrier between substrate and product. There is thus a huge demand for a narrowing of the thermodynamic substrate–product gap in order to overcome this limitation of typical fermentation productivity through regulating the intracellular redox balance. There are several conventional strategies to do so, such as aeration, co-production, and chemical (oxidant/reductant) addition, but these might not be appropriate as solutions to the current problems of productivity. Next-generation microbial redox controllers, such as metals and electrodes, are therefore being sought, which could be game-changers in fermentation because microbe–metal/electrode interaction is (1) bi-directional, (2) controllable, and (3) easily removable from the media.

The goal of this Special Issue is to present recent advances in microbial redox control research using microbe–metal/electrode interactions to improve productivity. We welcome authors’ contributions of not only their experimental results, but also their insights in this field.

Dr. Changman Kim
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Fermentation is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • bioelectrochemical systems
  • microbial fuel cells
  • microbial redox balance
  • microbe–metal interaction
  • microbial electrosynthesis
  • electro-fermentation

Published Papers (2 papers)

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Research

13 pages, 3270 KiB  
Article
Sediment Microbial Fuel Cells with Algae-Assisted Cathodes for Electricity Generation and Bio-Treatment of Sewage Sludge
by Lizheng Chen, Hongyi Zhang, Yongqi Li, Chunxia Zhao, Ling Liu, Lipin Li, Li Sun and Hui Li
Fermentation 2023, 9(12), 1010; https://doi.org/10.3390/fermentation9121010 - 08 Dec 2023
Viewed by 1295
Abstract
In this study, an algal–bacterial symbiotic consortium was integrated with the sediment microbial fuel cell (SMFC) to construct an algal–bacterial cathode SMFC (AC-SMFC) for excess sewage sludge treatment and electricity generation. A bacterial cathode SMFC (BC-SMFC) and a static settling system (SS-system) were [...] Read more.
In this study, an algal–bacterial symbiotic consortium was integrated with the sediment microbial fuel cell (SMFC) to construct an algal–bacterial cathode SMFC (AC-SMFC) for excess sewage sludge treatment and electricity generation. A bacterial cathode SMFC (BC-SMFC) and a static settling system (SS-system) were used as controls. Electrochemical analysis confirmed that the algal–bacterial biofilm on the cathode improved electricity production. The maximum power density of AC-SMFC was 75.21 mW/m2, which was 65.70% higher than that of the BC-SMFC (45.39 mW/m2). After 60 days of treatment, AC-SMFC achieved much higher removal efficiencies of the total chemical oxygen demand (TCOD) (59.60%), suspended solids (SS) (62.42%), and volatile suspended solids (VSS) (71.44%) in the sediment, compared to BC-SMFC and the SS-system, exhibiting an effective degradation of the organic matter in the sediment sludge. Moreover, the lower concentration of total nitrogen (TN) and total phosphorus (TP) in the overlying water of AC-SMFC demonstrated that the algae on the cathode could inhibit the accumulation of nitrogen and phosphorus released from the sediments. The three-dimensional excitation–emission matrix (EEM) fluorescence spectroscopy revealed that the tryptophan protein and aromatic protein in the loosely bound extracellular polymeric substances (LB-EPS) of the sediment sludge in the AC-SMFC were significantly decreased. Additionally, the abundance of functional microbiota in the AC-SMFC increased, such as Trichococcus, Alphaproteobacteria, and Clostridia, which contributed to electricity generation and sludge degradation. The combined application of microalgae and the SMFC provided a promising approach for excess sludge reduction and energy recovery. Full article
(This article belongs to the Special Issue Microbial Redox Control by Microbe–Metal/Electrode Interaction in Bioproduction)
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12 pages, 3448 KiB  
Communication
Bioconversion of Glycerol to 1,3-Propanediol Using Klebsiella pneumoniae L17 with the Microbially Influenced Corrosion of Zero-Valent Iron
by Da Seul Kong, Minsoo Kim, Shuewi Li, Sakuntala Mutyala, Min Jang, Changman Kim and Jung Rae Kim
Fermentation 2023, 9(3), 233; https://doi.org/10.3390/fermentation9030233 - 28 Feb 2023
Cited by 2 | Viewed by 1599
Abstract
The bacterial redox state is essential for controlling the titer and yield of the final metabolites in most bioconversion processes. Glycerol conversion to 1,3-propanediol (PDO) requires a large amount of reducing equivalent and the expression of reductive pathways. Zero-valent iron (ZVI) was used [...] Read more.
The bacterial redox state is essential for controlling the titer and yield of the final metabolites in most bioconversion processes. Glycerol conversion to 1,3-propanediol (PDO) requires a large amount of reducing equivalent and the expression of reductive pathways. Zero-valent iron (ZVI) was used in the glycerol bioconversion of Klebsiella pneumoniae L17. The level of 1,3-PDO production increased with the oxidation of ZVI (31.8 ± 1.2 vs. 25.7 ± 0.5, ZVI vs. no ZVI) while the cellular NADH/NAD+ level increased (0.6 vs. 0.3, ZVI vs. no ZVI). X-ray diffraction showed that the iron oxide (Fe2O3) was formed during glycerol fermentation. L17 obtained electrons from ZVI and dissolved the iron continuously to form cracks on the surface, suggesting microbially influenced corrosion (MIC) was involved on the surface of ZVI. The ZVI-implemented fermentation shifted bioconversion to a more glycerol-reductive pathway. The qPCR-presented glycerol dehydratase (DhaB) with ZVI implementation was strongly expressed compared to the control. These results suggest that ZVI can contribute to the biotransformation of PDO by inducing intracellular metabolic shifts. This study could also suggest a novel microbial fermentation strategy with the application of MIC. Full article
(This article belongs to the Special Issue Microbial Redox Control by Microbe–Metal/Electrode Interaction in Bioproduction)
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