A review on application of single and composite conductive additives for anaerobic digestion: Advances, challenges and prospects

Liu, Haoyu; Xu, Ying; Li, Lei; Dai, Xiaohu; Dai, Lingling

doi:10.1016/j.resconrec.2021.105844

Cited by 54 publications

(9 citation statements)

References 180 publications

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“…EPS acts as a cementing substance, leading to an improvement in the morphology and stability of microbial aggregates. Moreover, EPS has a high redox potential; thus, when it envelops the microbial cell, the electron transfer between cells will be stimulated by creating short conduits among them. , Furthermore, EPS released by anaerobes serves as a barrier to prevent harmful chemicals from penetrating the membrane. , Consequently, higher H 2 production and yield triggered by T80/RGO supplementation may be inferred by higher EPS excretion. Our findings were in agreement with a previous study that highlighted the positive relationship between fermentative hydrogen production, HE activity, and EPS secretion with the addition of magnetite NPs .…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, EPS has a high redox potential; thus, when it envelops the microbial cell, the electron transfer between cells will be stimulated by creating short conduits among them. 71,72 Furthermore, EPS released by anaerobes serves as a barrier to prevent harmful chemicals from penetrating the membrane. 43,73 Consequently, higher H 2 production and yield triggered by T80/RGO supplementation may be inferred by higher EPS excretion.…”

Section: Effect Of Surfactant/graphenementioning

confidence: 99%

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Stimulating the Fermentation Process of Industrial Food Waste via Nonionic Surfactant/Graphene Nanosheet Combined Supplementation

et al. 2022

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The synergistic impact of Tween 80 (T80) and reduced graphene oxide (RGO) on the codigestion process of food waste and biscuit wastewater via an anaerobic sequential batch reactor was investigated in this study. The T80/RGO-amended reactor exhibited a hydrogen yield of 313.2 ± 89.3 mL/gCODinitial, which is 1.98-fold higher than that of the control. This increase was a consequence of the increase of hydrogenase enzyme activity from 0.24 ± 0.11 to 0.46 ± 0.15 mg MBreduced/min, as well as the stimulation of hydrolytic enzyme activities (i.e., α-amylase, xylanase, CM-cellulase, polygalacturonase, protease, and lipase). Likewise, microbial community analysis revealed that the relative abundances of genera Acinetobacter, Syntrophomonas, and Clostridium (H2-producing species) were enhanced from 3.9, 2.3, and 2.8% to 10.8, 9.1, and 3.6%, respectively, when T80/RGO was supplemented. On the other hand, molecular docking analysis was performed to explore the interaction of the hydrogenase protein with RGO (binding score: −10.1 kcal/mol) and T80 (binding score: −4.1 kcal/mol) as possible targets with active site residues. Eventually, supplementation of the T80/RGO mixture could stimulate the efficiency of the fermentative hydrogen process and, consequently, be used in practical engineering applications.

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Section: Resultsmentioning

confidence: 99%

Section: Effect Of Surfactant/graphenementioning

confidence: 99%

Stimulating the Fermentation Process of Industrial Food Waste via Nonionic Surfactant/Graphene Nanosheet Combined Supplementation

et al. 2022

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“…171 Exogenous conductive materials can act as an electron conduit, thereby establishing an electrical bridge between electronactive microorganisms and methanogens to perform DIET. 159 For instance, Geobacter, a type of electron-active bacteria, was found to execute DIET in the AD system together with Methanosaeta and Methanosarcina. 172,173 In some studies, the authors speculated that the enrichment of Geobacter, Methanosaeta, and Methanosarcina might provide strong support for the occurrence of DIET in AD.…”

Section: Changes Of Microbial Communitymentioning

confidence: 99%

Effects of Mixtures of Engineered Nanoparticles and Cocontaminants on Anaerobic Digestion

Wang,

Pan,

Yang

et al. 2024

Environ. Sci. Technol.

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The widespread application of nanotechnology inevitably leads to an increased release of engineered nanoparticles (ENPs) into the environment. Due to their specific physicochemical properties, ENPs may interact with other contaminants and exert combined effects on the microbial community and metabolism of anaerobic digestion (AD), an important process for organic waste reduction, stabilization, and bioenergy recovery. However, the complicated interactions between ENPs and other contaminants as well as their combined effects on AD are often overlooked. This review therefore focuses on the co-occurrence of ENPs and cocontaminants in the AD process. The key interactions between ENPs and cocontaminants and their combined influences on AD are summarized from the available literature, including the critical mechanisms and influencing factors. Some sulfides, coagulants, and chelating agents have a dramatic "detoxification" effect on the inhibition effect of ENPs on AD. However, some antibiotics and surfactants increase the inhibition of ENPs on AD. The reasons for these differences may be related to the interactive effects between ENPs and cocontaminants, changes of key enzyme activities, adenosine triphosphate (ATP) levels, reactive oxygen species (ROS) production, and microbial communities. New scientific opportunities for a better understanding of the coexistence in real world situations are converging on the scale of nanoparticles.

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“…Furthermore, CF is superior to carbon fabric, activated carbon, and corrodible metal for long‐term application in sediment because of its great mechanical strength and chemical stability. Nevertheless, the hydrophobicity and inactive surface of CF are detrimental to bacterial adhesion and metabolism, compromising its ability to enhance DIET [17] . CFs are usually modified by nanomaterials or conducting polymers to adapt to various purposes.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the hydrophobicity and inactive surface of CF are detrimental to bacterial adhesion and metabolism, compromising its ability to enhance DIET. [17] CFs are usually modified by nanomaterials or conducting polymers to adapt to various purposes. For example, conductive polyaniline (PANI) is frequently applied to decorate the electrodes of fuel cells [18] because of its favorable environmental stability, high specific capacitance, good hydrophilicity, and biocompatibility.…”

Section: Introductionmentioning

confidence: 99%

Polyaniline/Carbon Nanotube‐Modified Carbon Felt for Accelerating Underwater Microbial Gas Production to Enhance Power Generation

Guan

Wen

et al. 2023

ChemNanoMat

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Harvesting energy from bubbles produced by seafloor microorganisms to power underwater devices is a promising method. However, the slow gas production rate under natural conditions hinders the practical application of this technology. Herein, we synthesized polyaniline/carboxyl multiwalled carbon nanotube/carbon felt (PANI/c‐MWCNT/CF) by dip‐coating and in‐situ chemical polymerization for accelerating gas production rate from underwater anaerobic digestion. The optimal WNCNTS addition dosage in modified CF was determined to be 0.5 g/L. Compared with the control group, the PANI/c‐MWCNT/CF improved the gas production yield and rate by 48% and 59%, respectively. Furthermore, after seven days of continuous experiments, the high gas production rate was maintained, demonstrating that the PANI/c‐MWCNT/CF is durable and stable. This study supplies enough gas for the underwater bubble energy harvester, removing environmental constraints on subsea in‐situ power generation and opening up a broad prospect for the power supply to underwater equipment.

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A review on application of single and composite conductive additives for anaerobic digestion: Advances, challenges and prospects

Cited by 54 publications

References 180 publications

Stimulating the Fermentation Process of Industrial Food Waste via Nonionic Surfactant/Graphene Nanosheet Combined Supplementation

Stimulating the Fermentation Process of Industrial Food Waste via Nonionic Surfactant/Graphene Nanosheet Combined Supplementation

Effects of Mixtures of Engineered Nanoparticles and Cocontaminants on Anaerobic Digestion

Polyaniline/Carbon Nanotube‐Modified Carbon Felt for Accelerating Underwater Microbial Gas Production to Enhance Power Generation

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