Glycerol degradation in single chamber microbial fuel cells dating utro Sønderborg

Glycerol degradation in single chamber microbial fuel cells
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Chemical properties of the catholytes and the p H change profiles could have significant impact on the bio-electrochemical activities, therefore the performance of the MFC system.Potassium persulfate was found to be the most suitable catholyte for generating the maximal power density of 9.5 m W/m2 with a peak current of 1.11 m A over a potential of 0.45 V, while degrading over 60% 2,4-dichlorophenol. subtilis-catalysed MFC could be a feasible technology for removal of hazardous phenol pollutants from industrial wastewater, while generating electricity.ABSTRACT: Alternative glycerol treatment and valorization, could be a promising solution, contributing to the biodiesel production economy.

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We present a variety of beneficial processes with product yield increases of maximal 36% in reductive and 84% in oxidative fermentations and final theoretical product yields up to 100%.This includes compounds that are already produced at industrial scale such as succinic acid, lysine and diaminopentane as well as potential novel bio-commodities such as isoprene, para-hydroxybenzoic acid and para-aminobenzoic acid.The best performance of the cell was observed at a glycerol concentration of 3.2 g COD L−1.At this concentration, the Coulombic efficiency (CE) was 34.1 %, the chemical oxygen demand (COD) removal efficiency was approximately 99 % and the maximum power density was 65.4 m W m−2.Here we present an in silico approach to identify beneficial production processes for electro fermentation by elementary mode analysis.

Since the fundamentals of electron transport between electrodes and microbes have not been fully uncovered yet, we propose different options and discuss their impact on biomass and product yields.

Further increase of glycerol concentration to 5.2 g COD L−1 did not enhance the MFC performance, since the power density remained at 63.4 m W m−2, while the CE and the COD removal efficiency decreased to 22.1 and 81 %, respectively.

The experimental results showed that glycerol is a suitable and promising substrate for power generation, using a simple two-chamber MFC and that acclimation of anaerobic sludge using glucose as substrate, is a suitable procedure for securing a stable MFC performance, even at high glycerol concentrations.

The MFC enables the removal of contaminants by bacteria with concurrent electricity generation through electron transfer mechanisms. subtilis is found to be a good exoelectrogenic bacterium for generating an optimum potential of 95 m V with 12 m A/m2 current density in MFC. subtilis was able to degrade ∼60% of 2,4-DCP into acceptable simpler metabolites, thus could be further utilized in treating hazardous phenolic contaminants while generating electricity through benign and sustainable wastewater treatment method.

ABSTRACT: Glycerol is an attractive feedstock for bioenergy and bioconversion processes but its use in microbial fuel cells (MFCs) for electrical energy recovery has not been investigated extensively.

MR-1 was distributed mainly on the electrode in MFC-J&M, whereas most of the J2B was observed in the suspension in the MFC-J reactor, indicating that the co-culture of both strains provides an ecological driving force for glycerol utilization using the electrode as an electron acceptor.