Comparative effect of conductive and dielectric materials on methanogenesis from highly concentrated volatile fatty acids. (June 2023)

• Record Type: Journal Article
• Authors: Shekhurdina, Svetlana; Zhuravleva, Elena; Kovalev, Andrey; Andreev, Egor; Kryukov, Emil; Loiko, Natalia; Laikova, Alexandra; Popova, Nadezhda; Kovalev, Dmitriy; Vivekanand, Vivekanand; Litti, Yuriy
• Is Part Of: Bioresource technology. Volume 377(2023)
• Publication Date: 2023-06
• Subjects: Direct interspecies electron transfer -- Anaerobic digestion -- Biofilms -- Electroactive microorganisms -- Pili-like structures; 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.2023.128966
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: AD of concentrated VFA is greatly enhanced by stainless steel mesh and carbon fiber. Electrogenic Ureibacillus, Limnochordia, Coprothermobacter, Ca. Caldatribacterium. Short thick pili-like structures 150 nm in width correlate with ECM and enhanced AD. Abstract: Various conductive materials and their dielectric counterparts were used to get deeper insights into contribution of direct interspecies electron transfer (DIET) in improving methanogenesis from highly concentrated volatile fatty acids (12.5 g/L). Potential CH4 yield, maximum CH4 production rate and lag phase were significantly (up to 1.4, 3.9 and 2.0 times, respectively) improved with addition of stainless-steel mesh (SM) and carbon felt (CF) compared to both control and dielectric counterparts (p < 0.05). kapp increased by 82% for SM and 63% for CF compared to control (p < 0.05). Short thick pili-like structures up to 150 nm in width were formed only in CF and SM biofilms, however, were more abundant for SM. Ureibacillus and Limnochordia specific for SM biofilms, and Coprothermobacter and Ca. Caldatribacterium for CF biofilms, were considered electrogenic. Promotion of DIET by conductive materials is governed by many factors, including specificity of electrogenic groups to material surface.