Alkalinity and salinity favor bioelectricity generation potential of Clostridium, Tetrathiobacter and Desulfovibrio consortium in Microbial Fuel Cells (MFC) treating sulfate-laden wastewater. (June 2020)

• Record Type: Journal Article
• Authors: Kumar, Smita S.; Kumar, Vivek; Gnaneswar Gude, Veera; Malyan, Sandeep K.; Pugazhendhi, Arivalagan
• Is Part Of: Bioresource technology. Volume 306(2020)
• Publication Date: 2020-06
• Subjects: Bioelectricity generation -- Consortium -- Microbial fuel cells -- Sulfate-reducing bacteria (SRB) -- Sulfur-oxidizing bacteria (SOB); Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2020.123110
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: 6 g/L NaCl gave lowest charge transfer resistance. Highest power density by Clostridium, Tetrathiobacter and Desulfovibrio obtained at pH 8. Redox peaks for the biogenic sulfite and sulfide support the one-step mineralization of sulfate. Sodium chloride in anolyte facilitates the direct electron transfer and reduce charge transfer resistance. Abstract: Clostridium, Tetrathiobacter and Desulfovibrio species are identified as suitable biocatalysts for treating organic-rich and sulfate-laden wastewater. Results from this study show that the power generation was much higher under alkaline conditions, i.e., pH of 8 when compared to neutral and acidic conditions. The effect of salinity was studied by varying the sodium chloride concentration at (1.5, 3, 4.5, 6, and 7.5 g/L NaCl) in anolyte. The highest power density of 1188 mW/m 3 was produced at a sodium chloride concentration of 6 g/L in the anolyte. Results from cyclic voltammetry and linear scan voltammetry analysis suggested the direct electron transfer mechanism favored by cytb and cytc, Redox peaks observed for the biogenic synthesis of sulfite and sulfide support the complete one-step mineralization of sulfate. Bioelectrochemical behavior of the selectively enriched microbial consortium confirms its use for the treatment of wastewaters high in salinity and sulfate concentrations.