In situ integration of microbial electrochemical systems into anaerobic digestion to improve methane fermentation at different substrate concentrations

Lee, Mungyu; Reddy, C. Nagendranatha; Min, Booki

doi:10.1016/j.ijhydene.2018.08.051

Cited by 40 publications

(15 citation statements)

References 42 publications

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“…Finally, after digestion, it was stored anaerobically in a bottle at 4°C and when loading, 20% of the digester was loaded with inoculum. The inoculum was incubated for 6 h at 32°C before the AD process to activate the microorganisms 31 …”

Section: Methodsmentioning

confidence: 99%

Increasing biogas and methane yield by adding sewage sludge and zero‐valent iron nanoparticles during the single‐stage anaerobic digestion with municipal solid waste

Gundoshmian

Ahmadi‐Pirlou

2022

Intl J of Energy Research

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Summary One of the most important problems of the anaerobic digestion (AD) process and the main obstacle to this complex structural conversion is lignocellulose and the difficulty of its biological conversion. One way to disrupt the lignocellulosic composition is using nanoparticles (NPs) with proper concentration. In this study, biomethane potential tests have been used to maximize the biomethane production from anaerobic co‐digestion of municipal solid waste (MSW) and sewage sludge (SS) under different mixing ratios (MSW:SS: 100:0, 50:50, 60:40, 80:20 and 90:10) and different concentrations of iron (Fe) NPs (50, 70, 90 and 110 ppm) to speed up the AD process of the substrate, which increases biomethane production. Increasing the SS ratio up to 40% dramatically increased the biomethane yield, in a way that after 18 days of hydraulic retention time, 90% of methane (270 NmL/g VS) was obtained. The results showed that the highest biomethane yield (based on the optimal mixing ratio obtained in the first experiment, MSW:SS: 60:40) was obtained by adding 90 ppm Fe NPs using the statistical analysis (Duncan test) compared to the control (P < 0.05). Also, using iron NPs (Fe NPs) led to an increase in cellulose by 83%, a decrease in lignin by 62% and a decrease in hemicellulose by 32%, indicating an increase in the degradability due to the presence of NPs. Most of the biomethane was produced at 90 ppm Fe NPs concentration, showing an increase of 44% compared to control, and the maximum reduction in total solids and volatile solids were 36% and 28%, observed in this reactor, compared to the control sample.

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Section: Methodsmentioning

confidence: 99%

Increasing biogas and methane yield by adding sewage sludge and zero‐valent iron nanoparticles during the single‐stage anaerobic digestion with municipal solid waste

Gundoshmian

Ahmadi‐Pirlou

2022

Intl J of Energy Research

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“…Clearly, the slight EV application (−0.3-−1.8 V vs. standard hydrogen electrode (SHE)) led to significant enhancements in CH 4 production (20-1360%). Previous studies showed that optimal range can be (−0.3-−1.4 V vs. SHE) [84] or (−0.2-−0.8 V vs. SHE) [85]. Variation in the optimal EV was found in the literature.…”

Section: Electrical Energy Input As Tool For Diet Pathway Stimulationmentioning

confidence: 98%

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 in situ systems did not expose to those limitations because carbon dioxide is released by organic particulate biodegradation occurred in the bioelectrode chamber. Equally, the in situ single compartment bioreactor has displayed better performance in current density and biogas upgrading due to more affordable biomass and nutrients established on the electrode upgrading's surface (Aryal et al 2022;Lee et al 2019).…”

Section: Improving Hydrogen Mass Transfer and Utilisation Efficiencymentioning

confidence: 99%

Integration of biogas systems into a carbon zero and hydrogen economy: a review

et al. 2022

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The Ukraine conflict has put critical pressure on gas supplies and increased the price of fertilisers. As a consequence, biogas has gained remarkable attention as a local source of both gas for energy and biofertiliser for agriculture. Moreover, climate change-related damage incentivises all sectors to decarbonise and integrate sustainable practices. For instance, anaerobic digestion allows decarbonisation and optimal waste management. Incorporating a biogas system in each country would limit global warming to 2 °C. If suitable policies mechanisms are implemented, the biogas industry could reduce global greenhouse gas emissions by 3.29–4.36 gigatonnes carbon dioxide equivalent, which represent about 10–13% of global emissions. Here, we review the role of the biogas sector in capturing methane and mitigating carbon emissions associated with biogas outputs. Since biogas impurities can cause severe practical difficulties in biogas storing and gas grid delivering systems, we present upgrading technologies that remove or consume the carbon dioxide in raw biogas, to achieve a minimum of 95% methane content. We discuss the role of hydrogen-assisted biological biogas upgrading in carbon sequestration by converting carbon dioxide to biomethane via utilising hydrogen generated primarily through other renewable energy sources such as water electrolysis and photovoltaic solar facilities or wind turbines. This conceptual shift of 'power to gas' allows storing and utilising the excess of energy generated in grids. By converting carbon dioxide produced during anaerobic digestion into additional biomethane, biogas has the potential to meet 53% of the demand for fossil natural gas. We also evaluate the role of digestate from biogas systems in producing biochar, which can be used directly as a biofertiliser or indirectly as a biomethanation enhancement, upgrading, and cleaning material.

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In situ integration of microbial electrochemical systems into anaerobic digestion to improve methane fermentation at different substrate concentrations

Cited by 40 publications

References 42 publications

Increasing biogas and methane yield by adding sewage sludge and zero‐valent iron nanoparticles during the single‐stage anaerobic digestion with municipal solid waste

Increasing biogas and methane yield by adding sewage sludge and zero‐valent iron nanoparticles during the single‐stage anaerobic digestion with municipal solid waste

Enhanced Anaerobic Digestion by Stimulating DIET Reaction

Integration of biogas systems into a carbon zero and hydrogen economy: a review

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