Evaluation on direct interspecies electron transfer in anaerobic sludge digestion of microbial electrolysis cell

Zhao, Zisheng; Zhang, Yaobin; Quan, Xie; Zhao, Huimin

doi:10.1016/j.biortech.2015.10.021

Cited by 168 publications

(50 citation statements)

References 29 publications

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“…Genomic analyses have so far not been able to identify the mechanism of extracellular electron transfer in Syntrophomonas (Sieber et al, 2010, 2012). In other studies, involving anaerobic membrane bioreactor (Smith et al, 2015), microbial fuel cells (Ishii et al, 2014) and microbial electrolysis cells (Zhao et al, 2016), Syntrophomonas were detected in the biofilms or anodic biofilms, and indicated that they was able to contribute to butyrate degradation and electricity generation.…”

Section: Discussionmentioning

confidence: 96%

Conductive Fe3O4 Nanoparticles Accelerate Syntrophic Methane Production from Butyrate Oxidation in Two Different Lake Sediments

Zhang

2016

Front. Microbiol.

139

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Syntrophic methanogenesis is an essential link in the global carbon cycle and a key bioprocess for the disposal of organic waste and production of biogas. Recent studies suggest direct interspecies electron transfer (DIET) is involved in electron exchange in methanogenesis occurring in paddy soils, anaerobic digesters, and specific co-cultures with Geobacter. In this study, we evaluate the possible involvement of DIET in the syntrophic oxidation of butyrate in the enrichments from two lake sediments (an urban lake and a natural lake). The results showed that the production of CH4 was significantly accelerated in the presence of conductive nanoscale Fe3O4 or carbon nanotubes in the sediment enrichments. Observations made with fluorescence in situ hybridization and scanning electron microscope indicated that microbial aggregates were formed in the enrichments. It appeared that the average cell-to-cell distance in aggregates in nanomaterial-amended enrichments was larger than that in aggregates in the non-amended control. These results suggested that DIET-mediated syntrophic methanogenesis could occur in the lake sediments in the presence of conductive materials. Microbial community analysis of the enrichments revealed that the genera of Syntrophomonas, Sulfurospirillum, Methanosarcina, and Methanoregula were responsible for syntrophic oxidation of butyrate in lake sediment samples. The mechanism for the conductive-material-facilitated DIET in butyrate syntrophy deserves further investigation.

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Section: Discussionmentioning

confidence: 96%

Conductive Fe3O4 Nanoparticles Accelerate Syntrophic Methane Production from Butyrate Oxidation in Two Different Lake Sediments

Zhang

2016

Front. Microbiol.

139

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“…Nevertheless, electromethanogenesis has been reported to take place in psicrophilic [145], mesophilic [8,13,146,160], and thermophilic conditions [15,53,161] proving robustness to the technology. Besides the introduction of electrodes directly in the anaerobic reactor, methane production could be enhanced by the addition of carbon-based (i.e., carbon cloth, carbon felt, and granular activated carbon) [76,147,162] or non-carbon-based [163] conductive materials as a method to increase electro-active methanogenic activity. Moreover, the coupling of an external cathode to the anaerobic digester resulted in an improvement of its performance [148].…”

Section: Applications Of Electromethanogenesismentioning

confidence: 99%

On the Edge of Research and Technological Application: A Critical Review of Electromethanogenesis

Blasco-Gómez

Batlle-Vilanova

Villano

et al. 2017

IJMS

164

103

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The conversion of electrical current into methane (electromethanogenesis) by microbes represents one of the most promising applications of bioelectrochemical systems (BES). Electromethanogenesis provides a novel approach to waste treatment, carbon dioxide fixation and renewable energy storage into a chemically stable compound, such as methane. This has become an important area of research since it was first described, attracting different research groups worldwide. Basics of the process such as microorganisms involved and main reactions are now much better understood, and recent advances in BES configuration and electrode materials in lab-scale enhance the interest in this technology. However, there are still some gaps that need to be filled to move towards its application. Side reactions or scaling-up issues are clearly among the main challenges that need to be overcome to its further development. This review summarizes the recent advances made in the field of electromethanogenesis to address the main future challenges and opportunities of this novel process. In addition, the present fundamental knowledge is critically reviewed and some insights are provided to identify potential niche applications and help researchers to overcome current technological boundaries.

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“…Studies investigating improved conversion rates and shorter start up lag times in anaerobic processes with the addition of conductive materials [139][140][141][142] [143] lay the groundwork for rational design of cathode material for CCPHF since conductive and semi-conductive materials are believed to serve as electrical conduits between species, even compensating for the lack of conductive membrane proteins ( Table 2) as depicted in Figure 11B. [144] These include carbon-based materials like CNTs [141] , carbon cloth [145] , carbon felt [146] , biochar [145,147] , granular activated carbon (GAC) [142,148] , graphite [145,146] ; and metal-based materials like stainless steel [143] , haematite [139] , and magnetite. [139,140] These conductive materials can be used in the fabrication and decoration of CCPHF cathodes to facilitate the occurrence of DIET, for example by creating CNT forests on porous ceramic hollow fibers ( Figure 5).…”

Section: Materials That Facilitate Direct Electron Transfermentioning

confidence: 99%

Dual‐Function Electrocatalytic and Macroporous Hollow‐Fiber Cathode for Converting Waste Streams to Valuable Resources Using Microbial Electrochemical Systems

et al. 2018

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Dual-function electrocatalytic and macroporous hollow-fiber cathodes are recently proposed as promising advanced material for maximizing the conversion of waste streams such as wastewater and waste CO to valuable resources (e.g., clean freshwater, energy, value-added chemicals) in microbial electrochemical systems. The first part of this progress report reviews recent developments in this type of cathode architecture for the simultaneous recovery of clean freshwater and energy from wastewater. Critical insights are provided on suitable materials for fabricating these cathodes, as well as addressing some challenges in the fabrication process with proposed strategies to overcome them. The second and complementary part of the progress report highlights how the unique features of this cathode architecture can solve one of the intrinsic bottlenecks (gas-liquid mass transfer limitation) in the application of microbial electrochemical systems for CO reduction to value-added products. Strategies to further improve the availability of CO to microbial catalysts on the cathode are proposed. The importance of understanding microbe-cathode interactions, as well as electron transfer mechanisms at the cathode-cell and cell-cell interface to better design dual-function macroporous hollow-fiber cathodes, is critically discussed with insights on how the choice of material is important in facilitating direct electron transfer versus mediated electron transfer.

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Evaluation on direct interspecies electron transfer in anaerobic sludge digestion of microbial electrolysis cell

Cited by 168 publications

References 29 publications

Conductive Fe3O4 Nanoparticles Accelerate Syntrophic Methane Production from Butyrate Oxidation in Two Different Lake Sediments

Conductive Fe3O4 Nanoparticles Accelerate Syntrophic Methane Production from Butyrate Oxidation in Two Different Lake Sediments

On the Edge of Research and Technological Application: A Critical Review of Electromethanogenesis

Dual‐Function Electrocatalytic and Macroporous Hollow‐Fiber Cathode for Converting Waste Streams to Valuable Resources Using Microbial Electrochemical Systems

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