New insights into the effect of direct interspecies electron transfer on syntrophic methanogenesis through thermodynamic analysis

Gu, Mengqi; Yin, Qidong; Liu, Yu; Du, Jin; Wu, Guangxue

doi:10.1016/j.biteb.2019.100225

Cited by 11 publications

(4 citation statements)

References 47 publications

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“…When the redox potentials were more negative, higher biomass yield and faster reaction rates were obtained. Using α-Fe 2 O 3 and Fe 3 O 4 (with a redox potential of −287 and −314 mV, respectively), biomass yields of 0.291 and 0.306 C-mol/mol as well as maximum reaction rates of 0.320 and 0.339 h –1 , respectively, were observed …”

Section: Interspecies Electron Transferring (Iet) Via a Biotic–biotic...mentioning

confidence: 99%

“…Using α-Fe 2 O 3 and Fe 3 O 4 (with a redox potential of −287 and −314 mV, respectively), biomass yields of 0.291 and 0.306 Cmol/mol as well as maximum reaction rates of 0.320 and 0.339 h −1 , respectively, were observed. 88 Metal conductivity could accelerate the electron transfer rate. Silver (Ag) at room temperature has the maximum conductivity of 6.8 × 10 7 S/m followed by copper (Cu) and gold (Au).…”

Section: ■ Interspecies Electron Transferring (Iet)mentioning

confidence: 99%

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Perspectives on Potential Applications of Nanometal Derivatives in Gaseous Bioenergy Pathways: Mechanisms, Life Cycle, and Toxicity

Elsamadony

Elreedy

Mostafa

et al. 2021

ACS Sustainable Chem. Eng.

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Nanosized metal derivatives (NMDs), referring to metals and their oxides, are extensively utilized as additives for anaerobic digestion (AD) and dark fermentation (DF) processes, for enhancing the production of methane (CH 4 ) and hydrogen (H 2 ), respectively. NMDs-derived positive impacts were widely confirmed in many previous studies; however, no consensus exists about how these have been acquired. Undoubtedly, NMDs affect extracellular electron transfer (EET). Consequently, we explore how biotic−biotic interactions, referring to direct interspecies electron transfer (DIET) among AD partners, and biotic−abiotic exchanges, which are mediated by redox reactions with metals, are affected. In this perspective, the mechanisms behind all those effects are reviewed and explained in detail, considering the specific properties of each NMD, e.g., size and type. We discuss previous studies that offer contradicting interpretations about which process dominates metal oxidation, metal reduction, or DIET. In addition, the fate of NMDs residues in the digestate after the treatment process is discussed, focusing on NMDs toxicity. From previous literature, the environmental impacts are evaluated for the production process of NMDs that are utilized in AD and DF processes via life-cycle assessment. This review provides a comprehensive understanding of NMDs−microbes interactions, which are mandatory for (i) building clear scientific knowledge about processes in play and (ii) engineering favorable conditions to achieve optimum yields in AD and DF processes.

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Section: Interspecies Electron Transferring (Iet) Via a Biotic–biotic...mentioning

confidence: 99%

Section: ■ Interspecies Electron Transferring (Iet)mentioning

confidence: 99%

Perspectives on Potential Applications of Nanometal Derivatives in Gaseous Bioenergy Pathways: Mechanisms, Life Cycle, and Toxicity

Elsamadony

Elreedy

Mostafa

et al. 2021

ACS Sustainable Chem. Eng.

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“…Furthermore, ORP could be lowered down, to more negative values, as a result of CM addition [73]; this is beneficial for CH 4 generation process, which need ORP of (−200 to −400 mv) in order to be successfully implemented [74]. From thermodynamic standpoint, the supplementation of CM, which are featured of their negative redox potential, into AD broth can lead to directing reactions to DIET route [75]. In addition, it was found that the types and activities of e-pili and cytochromes, expressed from Geobacter and Pelobacter species for electron transfer, are different based on the surface potential, which is linked to the supplemented CM [76].…”

Section: As a Tool For Diet Pathway Stimulationmentioning

confidence: 99%

Enhanced Anaerobic Digestion by Stimulating DIET Reaction

Mostafa

Song

et al. 2020

Processes

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Since the observation of direct interspecies electron transfer (DIET) in anaerobic mixed cultures in 2010s, the topic “DIET-stimulation” has been the main route to enhance the performance of anaerobic digestion (AD) under harsh conditions, such as high organic loading rate (OLR) and the toxicants’ presence. In this review article, we tried to answer three main questions: (i) What are the merits and strategies for DIET stimulation? (ii) What are the consequences of stimulation? (iii) What is the mechanism of action behind the impact of this stimulation? Therefore, we introduced DIET history and recent relevant findings with a focus on the theoretical advantages. Then, we reviewed the most recent articles by categorizing how DIET reaction was stimulated by adding conductive material (CM) and/or applying external voltage (EV). The emphasis was made on the enhanced performance (yield and/or production rate), CM type, applied EV, and mechanism of action for each stimulation strategy. In addition, we explained DIET-caused changes in microbial community structure. Finally, future perspectives and practical limitations/chances were explored in detail. We expect this review article will provide a better understanding for DIET pathway in AD and encourage further research development in a right direction.

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“…In particular, inter-species electron transfer (IET) with hydrogen and formate as electron carriers is known to be a major pathway. However, recent studies [26][27][28] have shown that electrons can flow from one cell to another without being shuttled by molecules but, instead, directly through direct contact, making methane production faster and thermodynamically more efficient. This phenomenon has been called direct inter-species electron transfer (DIET) [29,30] and can occur through electrically conductive pili, electrically conductive materials, and electron transport proteins on cell surfaces [31].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Anaerobic Digestion of Waste-Activated Sludge by Conductive Materials under High Volatile Fatty Acids-to-Alkalinity Ratios

Calabrò

Fazzino

Limonti

et al. 2021

Water

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Anaerobic digestion (AD) represents a suitable option for the management of the waste-activated sludge (WAS) produced in municipal wastewater treatment plants. Nevertheless, due to its complex characteristics, WAS is often barely degradable under conventional anaerobic processes. The use of conductive materials during AD provides a promising route for enhancing WAS digestion, through the effects of direct inter-species electron transfer (DIET). The present paper aims to evaluate the effects of the addition of four different materials—granular activated carbon (GAC), granular iron, and aluminium and steel scrap powders—in semi-continuous lab-scale reactors under very high volatile fatty acids-to-alkalinity ratios. In particular, the use of metallic aluminium in WAS digestion was investigated for the first time and compared to the other materials. The AD of WAS without the addition of conductive materials was impossible, while the use of steel powder and zero-valent iron is shown not to improve the digestion process in a satisfactory way. On the contrary, both GAC and Al allow for effective WAS degradation. At stable conditions, methane yields of about 230 NmLCH4/gVS and 212 NmLCH4/gVS are recorded for GAC- and Al-amended reactors, respectively. These two materials are the most promising in sustaining WAS AD through DIET also in case of unbalanced volatile fatty acids-to-alkalinity ratios.

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New insights into the effect of direct interspecies electron transfer on syntrophic methanogenesis through thermodynamic analysis

Cited by 11 publications

References 47 publications

Perspectives on Potential Applications of Nanometal Derivatives in Gaseous Bioenergy Pathways: Mechanisms, Life Cycle, and Toxicity

Perspectives on Potential Applications of Nanometal Derivatives in Gaseous Bioenergy Pathways: Mechanisms, Life Cycle, and Toxicity

Enhanced Anaerobic Digestion by Stimulating DIET Reaction

Enhancement of Anaerobic Digestion of Waste-Activated Sludge by Conductive Materials under High Volatile Fatty Acids-to-Alkalinity Ratios

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