Microbial electrochemical stimulation of caproate production from ethanol and carbon dioxide

Jiang, Yong; Chu, Na; Qian, Ding-Kang; Zeng, Raymond J.

doi:10.1016/j.biortech.2019.122266

Cited by 79 publications

(28 citation statements)

References 48 publications

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“…Considering that excellent bio lms tend to favor the electron transfer capacity between electrodes and microbes and microbial cells [26], timely CV analyses of the biocathodes in the ve reactors at the end of the State and State II operations were developed. Although it is di cult to accurately determine the speci c reaction process by CV analysis in mixed culture, the peak shape, response value, and curve area can be used to qualitatively compare the redox performance of the same type of biocathode and conjecture the peak's reaction type after different operations [12]. As shown in Fig.…”

Section: Sem and Sem-eds Analyses Of Cathode Bio Lm After Nzvi Additionmentioning

confidence: 99%

“…In mixed-culture MES, hydrogen is considered to be an important intermediate for electron transfer, and therefore the cathode potential of most studies was controlled at − 0.8 V to − 0.9 V (vs. standard hydrogen potential, SHE) to meet the hydrogen evolution thermodynamic condition [10,12,16]. However, it is clear that there are differences in the incubation conditions and con gurations that vary from different reactors, which means that the applied voltage regulation should be a prerequisite [34].…”

Section: Synergistical Mechanisms Of Voltage and Nzvi For Mcfas Produ...mentioning

confidence: 99%

“…However, the carbon dioxide conversion is often limited by the insu cient electron equivalent of MES, resulting in low electron recovery from caproate [8]. Therefore, various treatment methods have been applied to improve the availability of electron, such as multiple-electron donors strategy (including ethanol plus electrode and syngas plus electrode) [12,13], electron shuttles/mediators addition (such as biochar, neutral red) [14,15], and electrode optimization [16,17]. Unfortunately, the above treatment techniques generally require additional chemical or energy input, increasing the cost of the operation in MES [18].…”

Section: Introductionmentioning

confidence: 99%

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Nano zero-valent iron assisted microbial electrosynthesis for medium-chain fatty acids production

Zhang

et al. 2022

Preprint

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Background: Microbial electrosynthesis (MES) has been considered a promising platform for carboxylic acids production using homoacetogenic and chain-elongating bacteria. However, this biotechnology is still in its infancy, and many limitations are needed to be transcended, such as low electron transfer efficiency between cathode and microbes.Results: In this study, nano zero-valent iron (NZVI) was employed to improve carboxylic acid production in the MES system. The final accumulated acetate, butyrate, and caproate concentration enhanced from 700.1, 53.6, and 11.8 mg/L to 1.6, 1.1, and 0.7 g/L, with the maximum yield on bicarbonate of 20.7%, 18.7%, and 13.7%, respectively. Besides performing as an additional electron donor, NZVI was also proven to facilitate the formation of electroactive biofilms according to the results of DNA concentration. In addition, it was found that the anaerobic corrosion of NZVI promoted the domination of hydrogen-producing bacteria Paraclostridium, with the increasing relative abundance from 16.78% to 44.18% in the biofilm under open-circuit mode. While under the closed-circuit, the presence of NZVI resulted in significantly higher relative abundances of homoacetogenic bacteria (Terrisporobacter: 20.91%) and chain-elongating bacteria (Clostridium-sensu-stricto-12: 11.8%) in biofilm than in the catholyte (2.18% and 1.63% correspondingly).Conclusions: This study provided the evidence and revealed how NZVI assisted carboxylic acid production in MES and contributes to the application prospects of MES for carbon utilization and energy sustainability.

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Section: Sem and Sem-eds Analyses Of Cathode Bio Lm After Nzvi Additionmentioning

confidence: 99%

Section: Synergistical Mechanisms Of Voltage and Nzvi For Mcfas Produ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nano zero-valent iron assisted microbial electrosynthesis for medium-chain fatty acids production

Zhang

et al. 2022

Preprint

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“…Although acetic acid can be produced in MES with high selectivity (>90%) (Nevin et al, 2010), conversion of CO 2 to longer-chain carboxylic acids would be in low specificity and at low production rates (Dessì et al, 2021). For example, Jiang et al reported the highest production rate of caproate is 2.41 g/(L$d) (Jiang et al, 2020).…”

Section: Microbial Electrosynthesismentioning

confidence: 99%

“…For example, Jiang et al. reported the highest production rate of caproate is 2.41 g/(L·d) ( Jiang et al., 2020 ).…”

Section: Emerging Biomethane Production Technologiesmentioning

confidence: 99%

Emerging bioelectrochemical technologies for biogas production and upgrading in cascading circular bioenergy systems

et al. 2021

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Biomethane is suggested as an advanced biofuel for the hard-to-abate sectors such as heavy transport. However, future systems that optimize the resource and production of biomethane have yet to be definitively defined. This paper assesses the opportunity of integrating anaerobic digestion (AD) with three emerging bioelectrochemical technologies in a circular cascading bioeconomy, including for power-to-gas AD (P2G-AD), microbial electrolysis cell AD (MEC-AD), and AD microbial electrosynthesis (AD-MES). The mass and energy flow of the three bioelectrochemical systems are compared with the conventional AD amine scrubber system depending on the availability of renewable electricity. An energy balance assessment indicates that P2G-AD, MEC-AD, and AD-MES circular cascading bioelectrochemical systems gain positive energy outputs by using electricity that would have been curtailed or constrained (equivalent to a primary energy factor of zero). This analysis of technological innovation, aids in the design of future cascading circular biosystems to produce sustainable advanced biofuels.

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Role of Microorganisms in Environmental Remediation and Resource Recovery through Microbe‐Based Technologies Having Major Potentials

Malaviya¹,

Sharma²,

Sharma³

et al. 2022

Good Microbes in Medicine, Food Production, Biotechnology, Bioremediation, and Agriculture

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Microbial electrochemical stimulation of caproate production from ethanol and carbon dioxide

Cited by 79 publications

References 48 publications

Nano zero-valent iron assisted microbial electrosynthesis for medium-chain fatty acids production

Nano zero-valent iron assisted microbial electrosynthesis for medium-chain fatty acids production

Emerging bioelectrochemical technologies for biogas production and upgrading in cascading circular bioenergy systems

Role of Microorganisms in Environmental Remediation and Resource Recovery through Microbe‐Based Technologies Having Major Potentials

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