Redox-based electron exchange capacity of biowaste-derived biochar accelerates syntrophic phenol oxidation for methanogenesis via direct interspecies electron transfer

Wang, Gaojun; Gao, Xin; Li, Qian; Zhao, He-Xiang; Liu, Yanzheng; Wang, Xiaochang C.; Chen, Rong

doi:10.1016/j.jhazmat.2019.121726

Cited by 108 publications

(39 citation statements)

References 40 publications

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“…37 Yu et al and Wang et al proved that pyrochar played a critical role in alleviating external inhibition caused by refractory compounds due to its surface redox-active moieties that might favor DIET. 32,38 However, in this study, the role of pyrochar serving as an electron shuttle mechanism might not be sufficient to trigger efficient DIET because the unique role of electron conduits cannot be substituted by electron shuttles. 39 These findings lead to a plausible conclusion that the promoted biomethane production resulted from the electron conduit function transferring electrons between microbes rather than the electron shuttle.…”

Section: ■ Materials and Methodsmentioning

confidence: 80%

Graphene Addition to Digestion of Thin Stillage Can Alleviate Acidic Shock and Improve Biomethane Production

Lin

Kang

et al. 2020

ACS Sustainable Chem. Eng.

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Production of biomethane from distillery byproducts (such as stillage) in a circular economy system may facilitate a climate neutral alcohol industry. Anaerobic digestion (AD) of easily degradable substrates can lead to rapid acidification and accumulation of intermediate volatile fatty acids, reducing microbial activity and biomethane production. Carbonaceous materials may function as an abiotic conductive conduit to stimulate microbial electron transfer and resist adverse impacts on AD. Herein, nanomaterial graphene and more cost-effective pyrochar were comparatively assessed in their ability to recover AD performance after acidic shock (pH 5.5). Results showed that graphene addition (1.0 g/L) could lead to a biomethane yield of 250 mL/g chemical oxygen demand; this is an 11.0% increase compared to that of the control. The recovered process was accompanied by faster propionate degradation (CH3CH2COO– + 2H2O → CH3COO– + CO2 + 6H+ + 6e–). The enhanced performance was possibly ascribed to the high electrical conductivity of graphene. In comparison, pyrochar addition (1.0 and 10.0 g/L) did not enhance the biomethane yield, though it reduced the digestion lag-phase time by 18.1% and 12.2% compared to the control, respectively. Microbial taxonomy analysis suggested that Methanosarcina (81.5% in abundance) with diverse metabolic pathways and OTU in the order DTU014 (6.4% in abundance) might participate in direct interspecies electron transfer contributing to an effective recovery from acidic shock.

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Section: ■ Materials and Methodsmentioning

confidence: 80%

Graphene Addition to Digestion of Thin Stillage Can Alleviate Acidic Shock and Improve Biomethane Production

Lin

Kang

et al. 2020

ACS Sustainable Chem. Eng.

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“…These factors lead to a longer start-up cycle, which affects anaerobic digestion efficiency and causes an increase in operating cost. Studies have shown that DIET mediated by conductive materials can significantly shorten lag time of anaerobic digestion reactor with different types of substrates, such as glucose ( Luo et al, 2015 ; Yan et al, 2017 ), phenol ( Wang et al, 2020a ), benzoate ( Zhuang et al, 2015 ), and mixed organic carbon ( Yin et al, 2017b ; Wang G. et al, 2018 ). Moreover, establishing DIET by adding conductive materials significantly shortened the lag period of anaerobic digestion system even under conditions of high hydrogen partial pressure, high concentration of ammonia nitrogen, and sulfur inhibition.…”

Section: Improvements Of Anaerobic Digestion Performancesmentioning

confidence: 99%

Improvement of Direct Interspecies Electron Transfer via Adding Conductive Materials in Anaerobic Digestion: Mechanisms, Performances, and Challenges

Fang

Chang

et al. 2022

Front. Microbiol.

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Anaerobic digestion is an effective and sustainable technology for resource utilization of organic wastes. Recently, adding conductive materials in anaerobic digestion to promote direct interspecies electron transfer (DIET) has become a hot topic, which enhances the syntrophic conversion of various organics to methane. This review comprehensively summarizes the recent findings of DIET mechanisms with different mediating ways. Meanwhile, the influence of DIET on anaerobic digestion performance and the underlying mechanisms of how DIET mediated by conductive materials influences the lag phase, methane production, and system stability are systematically explored. Furthermore, current challenges such as the unclear biological mechanisms, influences of non-DIET mechanisms, limitations of organic matters syntrophically oxidized by way of DIET, and problems in practical application of DIET mediated by conductive materials are discussed in detail. Finally, the future research directions for practical application of DIET are outlined.

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“…Similar to the role of carbon fiber, the biochar actually constructs a conductivity network to accelerate electron transfer ( Figure 2B) and thus increase the validation of biocurrent stimulation in addition to abovementioned physicochemical properties. Biochar can also promote direct interspecies electron transfer (DIET) (Wang et al, 2020). On the one hand, DIET by biochar increases the current density of system, which provides a stronger stimulation on the activity of degrading bacteria.…”

Section: The Effect Of Mfc Configurationmentioning

confidence: 99%

The Utility of Electrochemical Systems in Microbial Degradation of Polycyclic Aromatic Hydrocarbons: Discourse, Diversity and Design

Hao

Li²,

Xiao

et al. 2020

Front. Microbiol.

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Redox-based electron exchange capacity of biowaste-derived biochar accelerates syntrophic phenol oxidation for methanogenesis via direct interspecies electron transfer

Cited by 108 publications

References 40 publications

Graphene Addition to Digestion of Thin Stillage Can Alleviate Acidic Shock and Improve Biomethane Production

Graphene Addition to Digestion of Thin Stillage Can Alleviate Acidic Shock and Improve Biomethane Production

Improvement of Direct Interspecies Electron Transfer via Adding Conductive Materials in Anaerobic Digestion: Mechanisms, Performances, and Challenges

The Utility of Electrochemical Systems in Microbial Degradation of Polycyclic Aromatic Hydrocarbons: Discourse, Diversity and Design

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