Effect of different carbon sources on sulfate reduction and microbial community structure in bioelectrochemical systems

Abstract

Microbial electrolysis cells (MECs) have rapidly developed into a promising technology to treat sulfaterich wastewater that lacks electron donors. However, little is known regarding the effect of different carbon sources on the microbial community structure bioelectrochemical systems. This study sought to investigate the effect of different carbon sources (NaHCO 3 , ethanol, and acetate were employed as sole carbon source respectively) on the performance of sulfate-reducing biocathodes. The sulfate reduction e ciency enhanced by the bioelectrochemical systems was 8.09%−11.57% higher than that of opencircuit reference experiments. Furthermore, the optimum carbon source was ethanol with a maximum sulfate reduction rate of 170 mg L −1 d −1 in the bioelectrochemical systems. The different carbon sources induced signi cant differences in sulfate reduction e ciency as demonstrated by the application of a micro-electrical eld. The dominant sulfate-reducing bacteria that use NaHCO 3 and acetate as carbon sources were Desulfobacter and Desulfobulbus, whereas those that use ethanol as carbon source were Desulfomicrobium and Desulfovibrio. Our results suggest that ethanol is a more suitable carbon source for sulfate reduction in bioelectrochemical systems.

Mitigation of oxidative stress and inflammatory factors, along with the antibrowning and antimicrobial effects of cassia seed microbial fermentation solution

“…Compared to other groups, the anthraquinone content increased in the lactose group fermentation solution ( Figure 1F ). This can be attributed to the carbon source, which directly influences microbial activity and regulates the energy used for bacterial growth ( Pan et al, 2023 ). The maximum anthraquinone content was attained when the lactose concentration was 1% (w/v) ( Figure 2A ).…”

The Microbial Communities of Anaerobic Respiration and Fermentation Degrading Chitin Exist in the Anaerobic Sludge of Microbial Fuel Cell Anodes

“…Treponema were the EAB and involved in the denitrification process [34]. Desulfovirga, Desulfomicrobium and Desulfobulbus were sulfate-reducing bacteria and EAB; Desulfovirga and Desulfobulbus were enriched using NaHCO 3 and acetate as carbon sources, while Desulfomicrobium were enriched using ethanol as the carbon source [35]. Nitrosomonas were the nitrogen transformation functional bacteria in the microbial fuel cell system [36].…”