Mechanisms, performance, and the impact on microbial structure of direct interspecies electron transfer for enhancing anaerobic digestion-A review

Feng, Lu; He, Shufei; Gao, Zhelu; Zhao, Weixin; Jiang, Junqiu; Zhao, Qingliang; Wei, Liangliang

doi:10.1016/j.scitotenv.2022.160813

Cited by 41 publications

(12 citation statements)

References 109 publications

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“…The primary mechanism by which conductive materials improve AD performance involves facilitating direct electron transfer from certain bacteria to archaea through these conductive materials. This process enables the syntrophic metabolisms of microorganisms, a phenomenon known as direct interspecies electron transfer (DIET) . In AD systems where conductive materials are introduced, specific bacterial species, such as Geobacter , Sporanaerobacter , Geobacteraceae , Clostridium , Sphaerochaeta , Defluviitoga , Thermovirga , and Cloacibacillus , have been frequently identified .…”

Section: Introductionmentioning

confidence: 99%

“…The introduction of GAC led to a methane yield increase 1.17–17.85-fold higher than that of the control group across different substrates. In addition, the GAC dosage used was 0.03 g/mL–50 g/L, along with a GAC particle diameter of 0.8–2.4 mm . However, the optimal amount of GAC addition exhibited significant variability among different substrates.…”

Section: Introductionmentioning

confidence: 99%

“…Iron-based materials have been widely employed to promote methanogenesis compared to carbon-based materials . The range of the added amounts and subsequent methane yield enhancements of different substrates resulting from the incorporation of iron-based materials are 10–27 g/L and 1.07–18 times higher than those observed in the control group, respectively . Wang et al compared the effect of ZVI, magnetite, and ferric oxide in different amounts on the AD performance of food waste, revealing the highest cumulative methane production from food waste for the ZVI group, with an added amount of 5 g/L.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the GAC dosage used was 0.03 g/mL–50 g/L, along with a GAC particle diameter of 0.8–2.4 mm. 9 However, the optimal amount of GAC addition exhibited significant variability among different substrates. For instance, Dastyar et al 10 put 15 g/L percolate powdered activated carbon into a high-solid anaerobic digestion (HSAD) system, resulting in a 17% increase in cumulative biomethane yield for the OFMSW compared to that of the control.…”

Section: Introductionmentioning

confidence: 99%

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Adding Granular Activated Carbon and Zerovalent Iron to the High-Solid Anaerobic Digestion System of the Organic Fraction of Municipal Solid Waste: Anaerobic Digestion Performance and Microbial Community Analysis

Zhang,

Yuan,

Zuo

et al. 2024

ACS Omega

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Anaerobic digestion (AD) performance and microbial dynamics were investigated in a high-solid anaerobic digestion (HSAD) system of the organic fraction of municipal solid waste (OFMSW). 1, 5, 10, and 15% (w/w, dry weight of the OFMSW) of granular activated carbon (GAC) and zerovalent iron (ZVI) were added to the HSAD system. The results showed that adding ZVI and GAC can improve the methane yield of the OFMSW. Notably, R-(GAC + ZVI) exhibited the highest cumulative methane yield of 343.0 mL/gVS, which was 57.1% higher than that of the R-control. At the genus level, the dominant bacteria included norank_f__norank_o__MBA03, norank_f__norank_o__norank_c__norank_p__Firmicutes, Fastidiosipila, norank_f__Rikenellaceae, and Sphaerochaeta, while Methanoculleus, Methanobacterium, and Methanosarcina were the dominant archaea. The highest relative abundance of norank_f__norank_o__norank_c__norank_p__Firmicutes was 30.8% for the R-(GAC + ZVI), which was 71.4% higher than that of the R-control. The relative abundance of Methanoculleus and Methanobacterium for the R-(GAC + ZVI) and the R-control group accounted for 79.0 and 90.8% of the total archaeal abundance, respectively. Additionally, the relative abundance of Methanosarcina was 10.6% for R-(GAC + ZVI), which was higher than that of the R-control (1.1%). After the addition of GAC and ZVI, the electron transfer capacity of the HSAD system was enhanced, resulting in promoted methane production. Thus, the simultaneous addition of GAC and ZVI to the HSAD system can be an effective strategy to promote the cumulative methane yield of the OFMSW.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Adding Granular Activated Carbon and Zerovalent Iron to the High-Solid Anaerobic Digestion System of the Organic Fraction of Municipal Solid Waste: Anaerobic Digestion Performance and Microbial Community Analysis

Zhang,

Yuan,

Zuo

et al. 2024

ACS Omega

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“…Direct interspecies electron transfer (DIET) is superior to traditional methods such as interspecies hydrogen transfer (IHT) and interspecies formate transfer (IFT) in the AD process. This approach overcomes the thermodynamic limitations associated with low hydrolysis efficiency and the H 2 partial pressure of complex organic matter, thereby enhancing the efficiency and stability of biogas production through AD (Feng et al, 2023; Xu et al, 2022). Studies have shown that iron‐based conductive materials can serve as electronic channels, stimulating DIET and promoting CH 4 production (Arisht et al, 2021; He, Wu, et al, 2022; Hu et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Effect of zero‐valent iron (ZVI) and biogas slurry reflux on methane production by anaerobic digestion of waste activated sludge

He,

Cui,

Chu

et al. 2024

Water Environment Research

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This study aimed to improve anaerobic digestion (AD) efficiency through the addition of zero‐valent iron (ZVI) and biogas slurry. This paper demonstrated that methane production was most effectively promoted at a biogas slurry reflux ratio of 60%. The introduction of ZVI into anaerobic systems does not enhance its bioavailability. However, both biogas slurry reflux and the combination of ZVI with biogas slurry reflux increase the relative abundance of microorganisms involved in the direct interspecific electron transfer (DIET) process. Among them, the dominant microorganisms Methanosaeta, Methanobacterium, Methanobrevibacter, and Methanolinea accounted for over 60% of the total methanogenic archaea. The Tax4Fun function prediction results indicate that biogas slurry reflux and the combination of ZVI with biogas slurry reflux can increase the content of key enzymes in the acetotrophic and hydrotrophic methanogenesis pathways, thereby strengthening these pathways. The corrosion of ZVI promotes hydrogen production, and the biogas slurry reflux provided additional alkaline and anaerobic microorganisms for the anaerobic system. Their synergistic effect promoted the growth of hydrotrophic methanogens and improved the activities of various enzymes in the hydrolysis and acidification phases, enhanced the system's buffer capacity, and prevented secondary environmental pollution.Practitioner Points Optimal methane production was achieved at a biogas slurry reflux ratio of 60%. Biogas slurry reflux in anaerobic digestion substantially reduced discharge. ZVI addition in combination with biogas slurry reflux facilitates the DIET process.

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Enhancement of anaerobic digestion of dairy wastewater by addition of conductive materials with or without the combination of external voltage application

Fountoulakis,

Frkova,

Lemaigre

et al. 2024

J of Chemical Tech & Biotech

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BACKGROUNDThe addition of conductive materials or the application of external voltage is a promising novel methodology to enhance methane production in anaerobic digesters. However, there is limited knowledge about their individual or combined effects on the anaerobic digestion of dairy wastewater. The aim of this study was to examine the effects of granular activated carbon (GAC) or magnetite addition and external voltage application, both individually and in combination, for the anaerobic digestion of real, undiluted dairy wastewater.RESULTSThe results showed that the estimated maximum methane production rate increased significantly (P < 0.05) from 143 ± 8 mL gVSadded−1 day−1 in the control reactors to 163 ± 11 mL gVSadded−1 day−1 and 166 ± 11 mL gVSadded−1 day−1 in the reactors containing GAC, with or without the combination of external voltage, respectively. The addition of GAC, in both cases, resulted in higher consumption rate of acetate, indicating a promotion of the methanogenesis step. By contrast, the application of external voltage or the addition of magnetite had no significant effect on either methane production rate nor methane yield. Moreover, the analysis of the microbial community showed that the addition of GAC resulted in the enrichment of Desulfobacterota, Methanosarcina, Candidatus Methanofastidiosum and Methanolinea.CONCLUSIONOverall, GAC addition seems a promising strategy to increase methane production in anaerobic digesters treating dairy wastewater. © 2024 The Author(s). Journal of Chemical Technology and Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry (SCI).

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Mechanisms, performance, and the impact on microbial structure of direct interspecies electron transfer for enhancing anaerobic digestion-A review

Cited by 41 publications

References 109 publications

Adding Granular Activated Carbon and Zerovalent Iron to the High-Solid Anaerobic Digestion System of the Organic Fraction of Municipal Solid Waste: Anaerobic Digestion Performance and Microbial Community Analysis

Adding Granular Activated Carbon and Zerovalent Iron to the High-Solid Anaerobic Digestion System of the Organic Fraction of Municipal Solid Waste: Anaerobic Digestion Performance and Microbial Community Analysis

Effect of zero‐valent iron (ZVI) and biogas slurry reflux on methane production by anaerobic digestion of waste activated sludge

Enhancement of anaerobic digestion of dairy wastewater by addition of conductive materials with or without the combination of external voltage application

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