Electropolar effects on anaerobic fermentation of lignocellulosic materials in novel single-electrode cells

Qu, Guangfei; Qiu, Weixia; Liu, Yuhuan; Zhong, Dongwei; Ning, Ping

doi:10.1016/j.biortech.2014.02.052

Cited by 11 publications

(4 citation statements)

References 24 publications

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“…Single-chamber BES is featured by membrane-free characteristics (without anion exchange membrane (AEM) and cation exchange membrane (CEM)). In this context, Qu et al (2014) investigated the effect of the individual electrode (anode or cathode) at different micro-voltages (100, 250, 500, 2500 mV) on the AD of cow manure in single electrode-assisted fermenters (Li et al, 2021;Qu et al, 2014). They affirmed the enhancement of the average CH 4 content (77.9%) in the voltage-added (2500 mV) cathode-assisted reactors than that of the control (67.4%).…”

Section: Bes Applicationsmentioning

confidence: 96%

Recent progress towards in-situ biogas upgrading technologies

Zhao

Dong

2021

Science of The Total Environment

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Section: Bes Applicationsmentioning

confidence: 96%

Recent progress towards in-situ biogas upgrading technologies

Zhao

Dong

2021

Science of The Total Environment

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“…Compared with the results in the control group without electrode, the average biogas and methane yields under cathodic micro-voltage (-250 mV) were astonishingly improved by 2.82 and 2.44 mL•g -1 •d -1 , respectively. Meanwhile, the degradation ratios of lignin and cellulose were also improved by 23.11% and 19.46% [8].…”

Section: Introductionmentioning

confidence: 93%

Anaerobic fermentation of cow manure and wheat straw in low voltage electric field

Plume

Dubrovskis

2021

20th International Scientific Conference Engineering for Rural Development Proceedings

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Anaerobic fermentation (AF) is widely implemented technology for energy and organic fertilizer production in more than 50 biogas plants in Latvia. Increasing the efficiency of the anaerobic fermentation process plays an important role in increasing the competitiveness of biogas plants and reducing the state financial support required for the operation of biogas plants. The use of a low-voltage electric field is a promising method for improving the AF process and biogas quality. Experimental investigation of low voltage (0.49-0.75 V) influence on the AF process of cow manure and wheat straw was provided in 16 laboratory bioreactors in volume of 0.75 L in batch mode at temperature 38 ºC. The first group of 7 bioreactors was filled in with inoculums and cow manure and second group of bioreactors was filled in with inoculums and wheat straw. In each group, four bioreactors were arranged with graphite electrodes with wires for connection to a low voltage DC source. Biogas and methane obtainable from inoculums only were investigated in 2 control bioreactors for calculation of biogas obtainable from cow manure and wheat straw only. Anaerobic fermentation process was provided during 68 days until methane emission from bioreactors ceases. Both experimental groups showed an increase in methane production under the influence of a low-voltage electric field. The specific methane production from cow manure increases by 58%, if 0.49 V DC electricity was supplied to bioreactors. The specific methane production from wheat straw decreases by 0.6%, if 0.75 V DC electricity supplied to bioreactors in the second, post-fermentation period only. The effectiveness of usage of the electric field should be investigated further to optimise the electric voltage, form of electrodes and power supply mode.

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“…A more industrially realistic setup has been tested, whereby a single, polarised (anodic or cathodic voltage) electrode is submerged in the microbial culture, resulting in an open circuit (no current). This has been used successfully to improve biogas production during anaerobic fermentation [20], and to generate a current in MFCs [21].…”

Section: Overcoming the Limitations Of Electrosynthesismentioning

confidence: 99%

“…In small-scale experiments, such electrodes may require chemical pre-treatments to improve initial wettability and permit contact with the culture [23]. Stainless steel electrodes are occasionally used for biogas and H 2 evolution [20,24] but are more often integrated with carbon electrodes to improve current collection or provision due to higher conductivity [25]. While platinum-coated electrodes are often used as counter-electrodes [21] the cost of platinum makes industrial applications in working electrodes unfeasible.…”

Section: Overcoming the Limitations Of Electrosynthesismentioning

confidence: 99%

Conversion of Biomass to Chemicals via Electrofermentation of Lactic Acid Bacteria

et al. 2022

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Microbial electrosynthesis is the process of supplying electrons to microorganisms to reduce CO2 and yield industrially relevant products. Such systems are limited by their requirement for high currents, resulting in challenges to cell survival. Electrofermentation is an electron-efficient form of microbial electrosynthesis in which a small cathodic or anodic current is provided to a culture to alter the oxidation–reduction potential of the medium and, in turn, alter microbial metabolism. This approach has been successfully utilised to increase yields of diverse products including biogas, butanediol and lactate. Biomass conversion to lactate is frequently facilitated by ensiling plant biomass with homofermentative lactic acid bacteria. Although most commonly used as a preservative in ensiled animal feed, lactate has diverse industrial applications as a precursor for the production of probiotics, biofuels, bioplastics and platform chemicals. Lactate yields by lactic acid bacteria (LAB) are constrained by a number of redox limitations which must be overcome while maintaining profitability and sustainability. To date, electrofermentation has not been scaled past laboratory- or pilot-stage reactions. The increasing ease of genetic modification in a wide range of LAB species may prove key to overcoming some of the pitfalls of electrofermentation at commercial scale. This review explores the history of electrofermentation as a tool for controlling redox balance within bacterial biocatalysts, and the potential for electrofermentation to increase lactate production from low-value plant biomass.

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Electropolar effects on anaerobic fermentation of lignocellulosic materials in novel single-electrode cells

Cited by 11 publications

References 24 publications

Recent progress towards in-situ biogas upgrading technologies

Recent progress towards in-situ biogas upgrading technologies

Anaerobic fermentation of cow manure and wheat straw in low voltage electric field

Conversion of Biomass to Chemicals via Electrofermentation of Lactic Acid Bacteria

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