Advantage of conductive materials on interspecies electron transfer-independent acetoclastic methanogenesis: A critical review

Xiao, Leilei; Lichtfouse, Éric; Kumar, Pankaj

doi:10.1016/j.fuel.2021.121577

Cited by 27 publications

(8 citation statements)

References 147 publications

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“…In order to further understand the physiology of DIET between an exoelectrogen and Methanothrix, co-cultures were established between G. metallireducens and Methanothrix thermoacetophila. Previous studies have shown that conductive materials can enhance DIET between exoelectrogens and methanogens (32)(33)(34)(35)(36)(37), and they are frequently added to bioreactors dominated by Methanothrix species (24). Therefore, to more fully understand the impact that conductive materials can have on Methanothrix physiology, two different conductive materials, granular activated carbon (GAC) and magnetite nanoparticles were added to Mx.…”

Section: Introductionmentioning

confidence: 99%

Methane production byMethanothrix thermoacetophilavia direct interspecies electron transfer withGeobacter metallireducens

Zhou

Smith

et al. 2023

Preprint

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Methanothrixis widely distributed in natural and artificial anoxic environments and plays a major role in global methane emissions. It is one of only two genera that can form methane from acetate dismutation and through participation in direct interspecies electron transfer (DIET) with exoelectrogens. AlthoughMethanothrixis a significant member of many methanogenic communities, little is known about its physiology. In this study, transcriptomics helped to identify potential routes of electron transfer during DIET betweenGeobacter metallireducensandMethanothrix thermoacetophila. Additions of magnetite to cultures significantly enhanced growth by acetoclastic methanogenesis and by DIET, while granular activated carbon (GAC) amendments impaired growth. Transcriptomics suggested that the OmaF-OmbF-OmcF porin complex and the octaheme outer membranec-type cytochrome, Gmet_0930, were important for electron transport across the outer membrane ofG. metallireducensduring DIET withMx. thermoacetophila. Clear differences in the metabolism ofMx. thermoacetophilawhen grown via DIET or acetate dismutation were not apparent. However, genes coding for proteins involved in carbon fixation and a surface associated quinoprotein, SqpA, were highly expressed in all conditions. Expression of gas vesicle genes was significantly lower in DIET- than acetate-grown cells, possibly to facilitate better contact between membrane associated redox proteins during DIET. These studies reveal potential electron transfer mechanisms utilized by bothGeobacterandMethanothrixduring DIET and provide important insights into the physiology ofMethanothrixin anoxic environments.

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Section: Introductionmentioning

confidence: 99%

Methane production byMethanothrix thermoacetophilavia direct interspecies electron transfer withGeobacter metallireducens

Zhou

Smith

et al. 2023

Preprint

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“…52 Another study demonstrates that adding granular activated carbon (GAC) to methanogenic digesters enhances DIET between bacteria and methanogens, leading to increased methane production. 53 Nanomaterials can be modified to improve their biocompatibility, promoting the growth and activity of beneficial microbes in the MFC anode. Additionally, nanomaterials can enhance the stability and structure of the microbial biofilm, leading to a more robust and efficient MFC operation.…”

Section: Nanoadditivesmentioning

confidence: 99%

Enhancing bioelectricity generation from wastewater in microbial fuel cells using carbon nanomaterials

Attia,

Samer,

Mohamed

et al. 2024

J of Chemical Tech & Biotech

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Background: Microbial fuel cells (MFCs) offer a promising approach for treating wastewater and generating electrical energy simultaneously. However, their implementation in wastewater treatment plants is hindered by the limited electricity generation, often attributed to the electrolyte's high resistance. This study aimed to improve bioelectricity generation in MFCs by adding nanomaterials to the electrolyte to enhance conductivity.Results: Three types of nanomaterials, carbon nanotubes (CNTs), graphitic carbon nitride (g‐C3N4), and reduced graphene oxide (r‐GO), were synthesized and addition to the electrolyte at a concentration of 50 mg in 1.5 L. MFC performance was evaluated, employed a Hydraulic Retention Time (HRT) of 140 h, and compared to a control with no nanomaterials added. The addition of nanomaterials significantly improved MFC performance. Compared to the control, the MFCs with CNTs, g‐C3N4, and r‐GO exhibited: Higher voltage: 1.301 V (CNTs), 1.286 V (g‐C3N4), 1.280 V (r‐GO) vs. 0.570 V (control), Increased power density: 14.11 mW/m3 (CNTs), 13.78 mW/m3 (g‐C3N4), 13.66 mW/m3 (r‐GO) vs. 2.71 mW/m3 (control), Enhanced areal power density: 21.06 mW/m2 (CNTs), 20.57 mW/m2 (g‐C3N4), 20.39 mW/m2 (r‐GO) vs. 4.04 mW/m2 (control), and Improved coulombic efficiency: 19.43% (CNTs), 19.19% (g‐C3N4), 19.11% (r‐GO) vs. 8.54% (control).Conclusion: Incorporating nanomaterials into the MFC electrolyte significantly increased bioelectricity generation by 5.21 times and coulombic efficiency by 2.28 times compared to the control. This improvement is attributed to the high specific surface area of the nanomaterials, which facilitates the adhesion and growth of microorganisms around the anode, enhancing direct electron transfer.This article is protected by copyright. All rights reserved.

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“…GAC conductivity is normally larger than iron oxides but lower than nano-scale carbon materials [5,48]. It, however, possesses various advantages compared to nano-scale carbon materials, such as being lowprice and pollution-free.…”

Section: Conductive Effectsmentioning

confidence: 99%

“…Biomethane production from biomass decomposition through anaerobic digestion (AD) is considered a carbon-neutral process [1][2][3]. The anaerobic digestion process consists of four steps such as hydrolysis, acidogenesis, acetogenesis, and methanogenesis, which involves microbiome hydrolytic bacteria, acid-producing bacteria, acetogenic bacteria, and methanogens, respectively [4][5][6]. With a series of reactions in these microbes, biomass composed of macromolecular organic matter will be degraded into small molecules, such as acetate, hydrogen, carbon dioxide, and most importantly, methane.…”

Section: Introductionmentioning

confidence: 99%

Enhanced methane production by granular activated carbon: A review

Xiao

Liu

Kumar

et al. 2022

Fuel

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Advantage of conductive materials on interspecies electron transfer-independent acetoclastic methanogenesis: A critical review

Cited by 27 publications

References 147 publications

Methane production byMethanothrix thermoacetophilavia direct interspecies electron transfer withGeobacter metallireducens

Methane production byMethanothrix thermoacetophilavia direct interspecies electron transfer withGeobacter metallireducens

Enhancing bioelectricity generation from wastewater in microbial fuel cells using carbon nanomaterials

Enhanced methane production by granular activated carbon: A review

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