AI Article Synopsis
- Microbial electrosynthesis (MES) uses renewable electricity to convert carbon dioxide into carboxylates, with good mass transfer being critical for productivity.
- In a study comparing fluidized and fixed granular activated carbon (GAC) bed cathodes, fluidized beds showed lower acetate production rates and current densities by 42% and 47%, respectively.
- Despite a similar microbial community, fixed GAC beds demonstrated higher specific acetate production rates and charge efficiency, suggesting they are more effective for acetate production in MES.
Article Abstract
Microbial electrosynthesis (MES) can use renewable electricity to power microbial conversion of carbon dioxide (CO) into carboxylates. To ensure high productivities in MES, good mass transfer must be ensured, which could be accomplished with fluidization of granular activated carbon (GAC). In this study, fluidized and fixed GAC bed cathodes were compared. Acetate production rate and current density were 42 % and 47 % lower, respectively, in fluidized than fixed bed reactors. Although similar microbial consortium dominated by Eubacterium and Proteiniphilum was observed, lowest biomass quantity was measured with fixed GAC bed indicating higher specific acetate production rates compared to fluidized GAC bed. Furthermore, charge efficiency was the highest and charge recovery in carboxylates the lowest in fixed GAC beds indicating enhanced hydrogen evolution and need for enhancing CO feeding to enable higher production rates of acetate. Overall, fixed GAC beds have higher efficiency for acetate production in MES than fluidized GAC beds.
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| http://dx.doi.org/10.1016/j.biortech.2024.130896 | DOI Listing |
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Article Synopsis
- Microbial electrosynthesis (MES) uses renewable electricity to convert carbon dioxide into carboxylates, with good mass transfer being critical for productivity.
- In a study comparing fluidized and fixed granular activated carbon (GAC) bed cathodes, fluidized beds showed lower acetate production rates and current densities by 42% and 47%, respectively.
- Despite a similar microbial community, fixed GAC beds demonstrated higher specific acetate production rates and charge efficiency, suggesting they are more effective for acetate production in MES.
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Sci Total Environ
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Department of Environmental Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand; Center of Excellence on Hazardous Substance Management, Chulalongkorn University, Bangkok 10330, Thailand; Research unit Control of Emerging Micropollutants in Environment, Chulalongkorn University, Bangkok 10330, Thailand. Electronic address:
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