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Enhancing microbial electrosynthesis by releasing extracellular polymeric substances: Novel strategy through extracellular electron transfer improvement.

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Title: Enhancing microbial electrosynthesis by releasing extracellular polymeric substances: Novel strategy through extracellular electron transfer improvement.
Authors: Luo, Dan1,2 (AUTHOR), Zhang, Kang1,2 (AUTHOR), Song, Tianshun1,2,3 (AUTHOR) tshsong@njtech.edu.cn, Xie, Jingjing1,2,4 (AUTHOR) xiej@njtech.edu.cn
Source: Biochemical Engineering Journal. Jun2022, Vol. 184, pN.PAG-N.PAG. 1p.
Subjects: Charge exchange, Electrosynthesis, Nonionic surfactants, Membrane permeability (Biology), Microbial communities, Carbon dioxide
Abstract: Microbial electrosynthesis (MES) is a promising process in which microbes obtain electrons from electrodes, producing high value-added chemicals from CO 2. Electrons from the cathode are the only energy source for reducing CO 2 ; thus, the electron transfer rate is the key to the conversion efficiency of the entire MES system. Here, we report a strategy that promotes the release of extracellular polymeric substances (EPSs) by adding a surfactant to enhance microbial extracellular electron transfer (EET) in an MES system. The addition of the nonionic surfactant Tween 80 not only enables the cathode biofilm to secrete more EPSs, and thus, improve its electrochemical activity, but it also adjusts the composition of the mixed microbial community to promote the enrichment of the primary acetogen, namely, Acetobacterium. Consequently, the acetate production rate of the MES system with 80 mg/L Tween 80 addition was 1.42 times higher than that of the control, and its coulombic efficiency increased from 47.12 ± 2.71 % to 76.33 ± 1.08 %. This new strategy for releasing EPSs via surfactant treatment improves EET, and consequently, enhances MES efficiency. [Display omitted] • Tween 80 promotes the release of extracellular polymeric substances. • Tween 80 improves cell permeability on the biofilm. • Tween 80 adjusts the composition of the mixed microbial community. • Tween 80 improves the extracellular electron transfer efficiency of biofilms. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Microbial electrosynthesis (MES) is a promising process in which microbes obtain electrons from electrodes, producing high value-added chemicals from CO 2. Electrons from the cathode are the only energy source for reducing CO 2 ; thus, the electron transfer rate is the key to the conversion efficiency of the entire MES system. Here, we report a strategy that promotes the release of extracellular polymeric substances (EPSs) by adding a surfactant to enhance microbial extracellular electron transfer (EET) in an MES system. The addition of the nonionic surfactant Tween 80 not only enables the cathode biofilm to secrete more EPSs, and thus, improve its electrochemical activity, but it also adjusts the composition of the mixed microbial community to promote the enrichment of the primary acetogen, namely, Acetobacterium. Consequently, the acetate production rate of the MES system with 80 mg/L Tween 80 addition was 1.42 times higher than that of the control, and its coulombic efficiency increased from 47.12 ± 2.71 % to 76.33 ± 1.08 %. This new strategy for releasing EPSs via surfactant treatment improves EET, and consequently, enhances MES efficiency. [Display omitted] • Tween 80 promotes the release of extracellular polymeric substances. • Tween 80 improves cell permeability on the biofilm. • Tween 80 adjusts the composition of the mixed microbial community. • Tween 80 improves the extracellular electron transfer efficiency of biofilms. [ABSTRACT FROM AUTHOR]
ISSN:1369703X
DOI:10.1016/j.bej.2022.108496