Boosting biomethane yield and production rate with graphene: The potential of direct interspecies electron transfer in anaerobic digestion

Lin, Richen; Cheng, Jun; Zhang, Jiabei; Zhou, Junhu; Cen, Kefa; Murphy, Jerry D.

doi:10.1016/j.biortech.2017.05.017

Cited by 307 publications

(116 citation statements)

References 45 publications

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“…GO was reported to enhance the growth of human gut bacteria while inhibit the proliferation of pathogens (Chen et al, 2014), and the activity of anammox bacteria for the nitrogen removal could be enhanced by GO addition (Wang et al, 2013a,b;Wang et al, 2014). Also, it was demonstrated that the enhancement of microbes proliferation under methanogenic conditions was elucidated through the electron shuttle effects of GO, and graphene could boost the biomethane yield and production rate due to the enhancement of direct interspecies electron transfer in AD (Colunga et al, 2015;Lin et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Propionate is an important intermediate of the degradation of organic matter during AD, and due to thermodynamic constraints, the oxidation of propionate requires syntrophic cooperation of propionate-fermenting proton-reducing bacteria and H 2 -consuming methanogens (Narihiro et al, 2012). Graphene had been demonstrated to enhance the methane production during ethanol (also a key intermediate produce for the methane production) AD due to the enhancement of the direct interspecies electron transfer (DIET) (Lin et al, 2017). It seemed that the DIET of the propionate fermentation was also enhanced during swine manure AD, but what was different was that the oxygenic groups in the GO might also delivered the oxygen to the methanogens, which led to higher CO 2 production during swine manure AD.…”

Section: Vfasmentioning

confidence: 99%

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Effects of graphene oxide on the performance, microbial community dynamics and antibiotic resistance genes reduction during anaerobic digestion of swine manure

Zhang

Wang

et al. 2017

Bioresource Technology

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A B S T R A C TThe role of graphene oxide (GO) on anaerobic digestion (AD) of swine manure concerning the performance, microbial community and antibiotic resistance genes (ARGs) reduction was investigated. Results showed that methane production was reduced by 13.1%, 10.6%, 2.7% and 17.1% at GO concentration of 5 mg/L, 50 mg/L, 100 mg/L and 500 mg/L, respectively, but propionate degradation was enhanced along with GO addition. Both bacterial and archaeal community changed little after GO addition. AD could well reduce ARGs abundance, but it was deteriorated at the GO concentration of 50 mg/L and 100 mg/L and enhanced at 500 mg/L, while no obvious changes at 5 mg/L. Network and SEM analysis indicated that changes of each ARG was closely associated with variation of microbial community composition, environmental variables contributed most to the dynamics of ARGs indirectly, GO influenced the ARGs dynamics negatively and (heavy metal resistance genes (MRGs)) influenced the most directly.

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Section: Introductionmentioning

confidence: 99%

Section: Vfasmentioning

confidence: 99%

Effects of graphene oxide on the performance, microbial community dynamics and antibiotic resistance genes reduction during anaerobic digestion of swine manure

Zhang

Wang

et al. 2017

Bioresource Technology

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“…Lin et al [76] mentioned the potential of graphene as a solution for improved AD performance given that it has unique physicochemical properties such as extremely high electrical conductivity, large surface area, and great mechanical strength. Tian et al [77] added nano-sized graphene with concentrations of 30 and 120 mg/L to the reactor, and observed significant increase in methane production rates (17.0% and 51.4%, respectively) from artificial wastewater with glucose as the carbon source.…”

Section: Other Conductive Materialsmentioning

confidence: 99%

“…The activity of F 420 , a major coenzyme in the methanogenesis process, was remarkably increased (1.82-2.09 times) in the graphene-added reactor compared to the control. Lin et al [76] reported that 1 g/L of graphene is the optimal concentration for improving the methane production rate and yield from ethanol. Given that 20 g/L of activated carbon should be added to obtain an enhancement in biomethane production, a much smaller amount of graphene is needed for DIET stimulation.…”

Section: Other Conductive Materialsmentioning

confidence: 99%

Role and Potential of Direct Interspecies Electron Transfer in Anaerobic Digestion

et al. 2018

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Anaerobic digestion (AD) is an effective biological treatment for stabilizing organic compounds in waste/wastewater and in simultaneously producing biogas. However, it is often limited by the slow reaction rates of different microorganisms' syntrophic biological metabolisms. Stable and fast interspecies electron transfer (IET) between volatile fatty acid-oxidizing bacteria and hydrogenotrophic methanogens is crucial for efficient methanogenesis. In this syntrophic interaction, electrons are exchanged via redox mediators such as hydrogen and formate. Recently, direct IET (DIET) has been revealed as an important IET route for AD. Microorganisms undergoing DIET form interspecies electrical connections via membrane-associated cytochromes and conductive pili; thus, redox mediators are not required for electron exchange. This indicates that DIET is more thermodynamically favorable than indirect IET. Recent studies have shown that conductive materials (e.g., iron oxides, activated carbon, biochar, and carbon fibers) can mediate direct electrical connections for DIET. Microorganisms attach to conductive materials' surfaces or vice versa according to particle size, and form conductive biofilms or aggregates. Different conductive materials promote DIET and improve AD performance in digesters treating different feedstocks, potentially suggesting a new approach to enhancing AD performance. This review discusses the role and potential of DIET in methanogenic systems, especially with conductive materials for promoting DIET.

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“…Recent studies, however, have disclosed that IET can be mediated by electric currents flowing through conductive solid materials, a process that is specifically termed electric syntrophy or direct IET (Kato, ; Kouzuma, Kato, & Watanabe, ; Malvankar & Lovley, ). In addition to naturally occurring iron oxide minerals such as magnetite (Cruz Viggi et al., ; Kato, Hashimoto, & Watanabe, ,; Li et al., ; Liu et al., ; Yamada, Kato, Ueno, Ishii, & Igarashi, ; Zhuang, Tang, Wang, Hu, & Zhou, ), biological apparatus such as pili (Rotaru et al., ; Shrestha et al., ; Summers et al., ) and artificial conductive materials such as graphite (Chen et al., ), activated carbon (Liu et al., ; Rotaru et al., ), and carbon nanomaterials (Lin et al., ) have been reported as conduits of the electric currents that mediate syntrophy (reviewed in Cheng & Call, ; Lovley, ; Barua & Dhar, ). Because these studies have also pointed out that methanogenesis based on electric syntrophy is more efficient than methanogenesis based on diffusive transport of small molecules, supplementation with conductive particles has been proposed as a novel biotechnology for improvement of anaerobic wastewater treatment systems (Baek, Kim, & Lee, ; Dang et al., ; Sasaki et al., ; Zhao et al., ).…”

Section: Introductionmentioning

confidence: 99%

Enhancement of methanogenesis by electric syntrophy with biogenic iron‐sulfide minerals

Kato

Igarashi

2018

MicrobiologyOpen

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Recent studies have shown that interspecies electron transfer between chemoheterotrophic bacteria and methanogenic archaea can be mediated by electric currents flowing through conductive iron oxides, a process termed electric syntrophy. In this study, we conducted enrichment experiments with methanogenic microbial communities from rice paddy soil in the presence of ferrihydrite and/or sulfate to determine whether electric syntrophy could be enabled by biogenic iron sulfides. Although supplementation with either ferrihydrite or sulfate alone suppressed methanogenesis, supplementation with both ferrihydrite and sulfate enhanced methanogenesis. In the presence of sulfate, ferrihydrite was transformed into black precipitates consisting mainly of poorly crystalline iron sulfides. Microbial community analysis revealed that a methanogenic archaeon and iron- and sulfate-reducing bacteria (Methanosarcina, Geobacter, and Desulfotomaculum, respectively) predominated in the enrichment culture supplemented with both ferrihydrite and sulfate. Addition of an inhibitor specific for methanogenic archaea decreased the abundance of Geobacter, but not Desulfotomaculum, indicating that Geobacter acquired energy via syntrophic interaction with methanogenic archaea. Although electron acceptor compounds such as sulfate and iron oxides have been thought to suppress methanogenesis, this study revealed that coexistence of sulfate and iron oxide can promote methanogenesis by biomineralization of (semi)conductive iron sulfides that enable methanogenesis via electric syntrophy.

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Boosting biomethane yield and production rate with graphene: The potential of direct interspecies electron transfer in anaerobic digestion

Cited by 307 publications

References 45 publications

Effects of graphene oxide on the performance, microbial community dynamics and antibiotic resistance genes reduction during anaerobic digestion of swine manure

Effects of graphene oxide on the performance, microbial community dynamics and antibiotic resistance genes reduction during anaerobic digestion of swine manure

Role and Potential of Direct Interspecies Electron Transfer in Anaerobic Digestion

Enhancement of methanogenesis by electric syntrophy with biogenic iron‐sulfide minerals

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