The role of conductive materials in the start-up period of thermophilic anaerobic system

Yan, Wangwang; Shen, Nan; Xiao, Yeyuan; Chen, Yun; Sun, Fenglian; Tyagi, Vinay Kumar; Zhou, Yan

doi:10.1016/j.biortech.2017.05.046

Cited by 138 publications

(44 citation statements)

References 32 publications

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“…The utilized nFe 3 O 4 , purchased from Sigma-Aldrich (St. Louis, MO, USA) had a particle size of 50-100 nm. To each of the CNT-supplemented batches, 0.2 g of CNT was added in order to reach a concentration of 1 g CNT/L [1]. Batches with neither nFe 3 O 4 nor CNT were operated and considered as control.…”

Section: Methodsmentioning

confidence: 99%

“…Besides having various advantages such as being 10 6 times faster than traditional interspecies hydrogen transfer, direct interspecies electron transfer (DIET) features potential for both conserving the cell energy and securing a condensed electron flow [1][2][3]. Specifically, providing a DIET-based environment avoids the energy consumption dedicated for the generation of extracellular conductive pili and associated c-type cytochromes, which are required for the cells' electrical connection during anaerobic digestion (AD) [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Anaerobic Digestion of Long Chain Fatty Acid by Adding Magnetite and Carbon Nanotubes

Mostafa

Song

et al. 2020

Microorganisms

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This study investigated the impact of stimulating direct interspecies electron transfer (DIET), by supplementing nano-sized magnetite (nFe3O4, 0.5 g Fe/g VSS) and carbon nanotubes (CNT, 1 g/L), in anaerobic digestion of oleic acid (OA) at various concentrations (0.10–4.00 g chemical oxygen demand(COD)/L). Both supplementations could enhance CH4 production, and its beneficial impact increased with increased OA concentration. The biggest improvements of 114% and 165% compared to the control were achieved by nFe3O4 and CNT, respectively, at OA of 4 g COD/L. The enhancement can be attributed to the increased sludge conductivity: 7.1 ± 0.5 (control), 12.5 ± 0.8 (nFe3O4-added), and 15.7 ± 1.1 µS/cm (CNT-supplemented). Dissolved iron concentration, released from nFe3O4, seemed to have a negligible role in improving CH4 production. The excretion of electron shuttles, i.e., humic-like substances and protein-like substances, were found to be stimulated by supplementing nFe3O4 and CNT. Microbial diversity was found to be simplified under DIET-stimulating conditions, whereby five genera accounted for 88% of the total sequences in the control, while more than 82% were represented by only two genera (Methanotrix concilli and Methanosarcina flavescens) by supplementing nFe3O4 and CNT. In addition, the abudance of electro-active bacteria such as Syntrophomonas zehnderi was significantly increased from 17% to around 45%.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced Anaerobic Digestion of Long Chain Fatty Acid by Adding Magnetite and Carbon Nanotubes

Mostafa

Song

et al. 2020

Microorganisms

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“…Within the past three years, through the microorganism identification of biofilms developed in conductive materials, new exoelectrogenic bacteria have been discovered, such as Thauera, Sporanaerobacter, Enterococcus, Pseudomonas, Anaerolinaceae, Bacteroides, Streptococcus, Syntrophomonas, Sulfurospirillum, Caloramator, Tepidoanaerobacter, Coprothermobacter, Clostridium senso stricto, Peptococcaceae, and Bacillaceae, also new electrotrophic methanogen genera have been found able to participate in DIET, such as Methanosarcina, Methanobacterium, Methanolinea, Methanothrix, Methanoregula, and Methanospirillum [17,27,[35][36][37][38][39][40][41][42][43][44]. However, the number of bacteria that are capable of participating in DIET through conductive materials is still unknown [45].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Biochemical Methane Potential and Enrichment of Specific Electroactive Communities from Nixtamalization Wastewater using Granular Activated Carbon as a Conductive Material

et al. 2018

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Nejayote (corn step liquor) production in Mexico is approximately 1.4 × 1010 m3 per year and anaerobic digestion is an effective process to transform this waste into green energy. The biochemical methane potential (BMP) test is one of the most important tests for evaluating the biodegradability and methane production capacity of any organic waste. Previous research confirms that the addition of conductive materials significantly enhances the methane production yield. This study concludes that the addition of granular activated carbon (GAC) increases methane yield by 34% in the first instance. Furthermore, results show that methane production is increased by 54% when a GAC biofilm is developed 10 days before undertaking the BMP test. In addition, the electroactive population was 30% higher when attached to the GAC than in control reactors. Moreover, results show that electroactive communities attached to the GAC increased by 38% when a GAC biofilm is developed 10 days before undertaking the BMP test, additionally only in these reactors Geobacter was identified. GAC has two main effects in anaerobic digestion; it promotes direct interspecies electron transfer (DIET) by developing an electro-active biofilm and simultaneously it reduces redox potential from −223 mV to −470 mV. These results suggest that the addition of GAC to biodigesters, improves the anaerobic digestion performance in industrial processed food waste.

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“…Generally, when CMs are added to batch tests, lag phase reduction and CH 4 production rate increase could always be observed. However, the increase in CH 4 production yield is not necessarily achieved [48,[55][56][57][58][59][60][61]. Even, slight negative impact (−4%, compared to control) upon cumulative CH 4 production yield was observed by magnetite addition [62].…”

Section: As a Tool For Diet Pathway Stimulationmentioning

confidence: 94%

“…For interpreting the impact of CM upon methanogenesis, two important factors need to be considered, i.e., electrical conductivity and oxidation redox potential (ORP). Electrical conductivity of the utilized microbial consortia is supposed to be higher in CM-amended reactors, compared to control [16,53,55,67]. Such increases can be related to the improved e-pili secretion, which is implemented by EAB that are enriched in the presence of CM [67,71,72].…”

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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The role of conductive materials in the start-up period of thermophilic anaerobic system

Cited by 138 publications

References 32 publications

Enhanced Anaerobic Digestion of Long Chain Fatty Acid by Adding Magnetite and Carbon Nanotubes

Enhanced Anaerobic Digestion of Long Chain Fatty Acid by Adding Magnetite and Carbon Nanotubes

Enhancing Biochemical Methane Potential and Enrichment of Specific Electroactive Communities from Nixtamalization Wastewater using Granular Activated Carbon as a Conductive Material

Enhanced Anaerobic Digestion by Stimulating DIET Reaction

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