Additional electric field alleviates acidity suppression in anaerobic digestion of kitchen wastes via enriching electro-active methanogens in cathodic biofilms

Jiang, Zhihao; Yu, Qilin; Sun, Changsen; Jin, Zhen; Zhu, Yahui; Zhao, Zhiqiang; Zhang, Yaobin

doi:10.1016/j.watres.2022.118118

Cited by 60 publications

(10 citation statements)

References 56 publications

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“…Bio-electrochemical strategies have been extensively reported to strengthen anaerobic digestion. , However, the high energy input and the complicated/expensive electrode systems have restricted them from the wider practical application . Many studies reported that the CO 2 reduction in the cathode only contributed to a small portion of methane yield, ,, and the increased electro-activities of the electrically stimulated sludge were considered the main reason for the improved performances of anaerobic digesters. ,, Applying a DMF could induce an electromotive force in the sludge, which was verified to have similar effects as the electrical stimulation. This is the first time to find the effects of a DMF on each stage of anaerobic digestion and to reveal the mechanisms behind the phenomenon from the electrochemical view.…”

Section: Discussionmentioning

confidence: 92%

“…53,54 However, the high energy input and the complicated/expensive electrode systems have restricted them from the wider practical application. 55 Many studies reported that the CO 2 reduction in the cathode only contributed to a small portion of methane yield, 8,15,56 and the increased electro-activities of the electri- cally stimulated sludge were considered the main reason for the improved performances of anaerobic digesters. 1,57,58 Applying a DMF could induce an electromotive force in the sludge, which was verified to have similar effects as the electrical stimulation.…”

Section: Discussionmentioning

confidence: 99%

“…14 It seemed that the improved electro-activities of anaerobic aggregations with electrical stimulation were the important factor in enhancing anaerobic digestion. Together with the low cathode Coulomb efficiency that signalized the low portion of methane production from the cathodical CO 2 reduction, 15 the enhanced methane production with the electrical stimulation was ascribed to help the establishment of DIET via the increased electro-activity of sludge rather than the electrode reactions. In agreement, supplementation of electroactive materials such as magnetite or conductive carbon materials in anaerobic systems has been extensively reported to improve anaerobic digestion.…”

Section: Introductionmentioning

confidence: 99%

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Applying Dynamic Magnetic Field To Promote Anaerobic Digestion via Enhancing the Electron Transfer of a Microbial Respiration Chain

Yang

Zhang

2023

Environ. Sci. Technol.

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Electrochemical methods have been reported to strengthen anaerobic digestion, but the continuous electrical power supply and the complicated electrode installed inside the digester have restricted it from practical use. In this study, a dynamic magnetic field (DMF) was placed outside a digester to induce an electromotive force to electrically promote anaerobic digestion. With the applied DMF, an electromotive force of 0.14 mV was generated in the anaerobic sludge, and a 65.02% methane increment was obtained from the anaerobic digestion of waste-activated sludge. Experiments on each stage of anaerobic digestion showed that acidification and methanogenesis that involve electron transfer of respiration chains were promoted with the DMF, while solubilization and hydrolysis less related to respiration chains were not enhanced. Further analysis indicated that the induced electromotive force polarized the protein-like substances in the sludge to increase the conductivity and capacitance of the sludge. Electrotrophic methanogens (Methanothrix) and exoelectrogens (Exiguobacterium) were enriched with DMF. The kinetic isotope effect test confirmed that electron transfer was accelerated with DMF. Consistently, the concentration ratio of co-enzymes (NADH/NAD+ and F420H2/F420) that reflects the electron exchange with respiration chains significantly increased. Applying the DMF seemed a more accessible strategy to electrically strengthen anaerobic digestion.

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Applying Dynamic Magnetic Field To Promote Anaerobic Digestion via Enhancing the Electron Transfer of a Microbial Respiration Chain

Yang

Zhang

2023

Environ. Sci. Technol.

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“…Pseudo in situ Fourier transform infrared (FTIR) spectroscopy was used to find that with an electric field, the secretion of EPS was stimulated to mediate the EET between Syntrophomonas and Methanosarcina. 161 Pseudo in situ Raman spectroscopy indicated that cytochromes were abundant with the formation of DIET coculture biofilms (Figure 7g). 162 An electrochemical setup was constructed under a confocal microscope for in situ characterization of an O 2 gradient, when using O 2 -sensitive microbes for the production of biofertilizer (Figure 7h).…”

Section: Characterization Toolsmentioning

confidence: 99%

“…A combination of noninvasive methods can be used to gain an insight into dynamic microbial electrochemical and/or electrocatalytic processes. Pseudo in situ Fourier transform infrared (FTIR) spectroscopy was used to find that with an electric field, the secretion of EPS was stimulated to mediate the EET between Syntrophomonas and Methanosarcina . Pseudo in situ Raman spectroscopy indicated that cytochromes were abundant with the formation of DIET coculture biofilms (Figure g) .…”

Section: Characterization Toolsmentioning

confidence: 99%

Electricity-Driven Microbial Metabolism of Carbon and Nitrogen: A Waste-to-Resource Solution

Chu

Jiang

Liang

et al. 2023

Environ. Sci. Technol.

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Electricity-driven microbial metabolism relies on the extracellular electron transfer (EET) process between microbes and electrodes and provides promise for resource recovery from wastewater and industrial discharges. Over the past decades, tremendous efforts have been dedicated to designing electrocatalysts and microbes, as well as hybrid systems to push this approach toward industrial adoption. This paper summarizes these advances in order to facilitate a better understanding of electricity-driven microbial metabolism as a sustainable waste-to-resource solution. Quantitative comparisons of microbial electrosynthesis and abiotic electrosynthesis are made, and the strategy of electrocatalyst-assisted microbial electrosynthesis is critically discussed. Nitrogen recovery processes including microbial electrochemical N 2 fixation, electrocatalytic N 2 reduction, dissimilatory nitrate reduction to ammonium (DNRA), and abiotic electrochemical nitrate reduction to ammonia (Abio-NRA) are systematically reviewed. Furthermore, the synchronous metabolism of carbon and nitrogen using hybrid inorganic-biological systems is discussed, including advanced physicochemical, microbial, and electrochemical characterizations involved in this field. Finally, perspectives for future trends are presented. The paper provides valuable insights on the potential contribution of electricity-driven microbial valorization of waste carbon and nitrogen toward a green and sustainable society.

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Influence of Electric Fields on the Maturity and Microbial Communities During Sludge and Straw Composting

Chen,

Sun,

Zhang

et al. 2024

Waste Biomass Valor

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Additional electric field alleviates acidity suppression in anaerobic digestion of kitchen wastes via enriching electro-active methanogens in cathodic biofilms

Cited by 60 publications

References 56 publications

Applying Dynamic Magnetic Field To Promote Anaerobic Digestion via Enhancing the Electron Transfer of a Microbial Respiration Chain

Applying Dynamic Magnetic Field To Promote Anaerobic Digestion via Enhancing the Electron Transfer of a Microbial Respiration Chain

Electricity-Driven Microbial Metabolism of Carbon and Nitrogen: A Waste-to-Resource Solution

Influence of Electric Fields on the Maturity and Microbial Communities During Sludge and Straw Composting

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