Hydrogen production from buffer-free anaerobic fermentation liquid of waste activated sludge using microbial electrolysis system

Cai, Weiwei; Liu, Wenzong; Cui, Dan; Wang, Aijie

doi:10.1039/c6ra05037a

Cited by 15 publications

(3 citation statements)

References 28 publications

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“…A carbon brush was employed as the anode to enrich exoelectrogens. A pretreatment method for the brush anode was applied to improve anode performance according to a previous report (40) in which the brush anode was immersed in acetone for 24 h and heated at 450°C for 30 min. A carbon cloth cathode was fabricated with a Pt/C catalyst for the formation of the methanogenic community, as described previously (19).…”

Section: Methodsmentioning

confidence: 99%

“…The inoculum was prepared at a ratio of 1:1 (vol/vol) by mixing waste activated sludge from a secondary settlement (Gaobeidian wastewater treatment plant in Beijing) and effluent from bioelectrochemistry reactors operated over a long time. The artificial influent was 50 mM phosphate-buffered saline (PBS) with 1.50 g/liter acetate, as well as minerals and a vitamin solution, as previously described (40). The reactors were operated in batch mode at room temperature (20 Ϯ 5°C).…”

Section: Methodsmentioning

confidence: 99%

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Semiquantitative Detection of Hydrogen-Associated or Hydrogen-Free Electron Transfer within Methanogenic Biofilm of Microbial Electrosynthesis

Cai

Liu

Wang

et al. 2020

Appl Environ Microbiol

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Hydrogen-entangled electron transfer is verified as an important extracellular pathway of sharing reducing equivalents to regulate biofilm activities within the diversely anaerobic environment, especially in microbial electrosynthesis system. However, the lack of useful methods for in-situ hydrogen detection in cathodic biofilm, the role of hydrogen involved in electron transfer is still debatable. Herein, the cathodic biofilm was constructed in the CH4-produced microbial electrosynthesis reactors, in which the hydrogen evolution dynamic was analyzed to confirm the presence of hydrogen-associated electron transfer nearby the cathode within the micrometre scale. The fluorescent in-situ hybridization images indicated that a colocalized community of archaea and bacteria developed within the thick of biofilm 58.10 μm at cathode suggesting the hydrogen gradient detected by microsensor was consumed by the collaboration of bacteria and archaea. Coupling microsensor and cyclic voltammetry test further provided the semi-quantitative results of hydrogen-associated contribution to methane generation ( around 21.20% ± 1.57% having a potential of -0.5 V to 0.69 V). This finding provides deep insight into the mechanism of electron transfer in biofilm on conductive materials. IMPORTANCE: Electron transfer from the electrode to biofilm is of great interest to the fields of microbial electrochemical technology, bioremediation and methanogenesis. It has promising application potential to boost more value-added products or pollutant degradation. Importantly, the microbial ability to obtain electrons from electrode and utilizing it brings a new insight into the direct interspecies electron transfer during methanogenesis. Previous studies had verified the direct pathway of electron transfer from the electrode to the pure-culture bacterium, but it was rarely reported how the methanogenic biofilm of mixed cultures shares electrons by hydrogen-associated or hydrogen-free pathway. In the current study, a combination method of microsensor and cyclic voltammetry successfully semi-quantified the role of hydrogen in the electron transfer from the electrode to methanogenic biofilm.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Semiquantitative Detection of Hydrogen-Associated or Hydrogen-Free Electron Transfer within Methanogenic Biofilm of Microbial Electrosynthesis

Cai

Liu

Wang

et al. 2020

Appl Environ Microbiol

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“…Many different types of agricultural wastewater such as dairy manure slurry [73], swine wastewater [74] and fermentation effluent [75] have been used for the production of biohydrogen in MECs (Table 3). Comparing with other biohydrogen technologies such as anaerobic digestion and photobiological processes, MECs have demonstrated better performance in producing H 2 from more diverse substrates because of its ability to overcome thermodynamic limitations [18,76].…”

Section: Production Of Biohydrogenmentioning

confidence: 99%

Applications of Emerging Bioelectrochemical Technologies in Agricultural Systems: A Current Review

Chen

Anandhi

2018

Energies

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Background: Bioelectrochemical systems (BESs) are emerging energy-effective and environment-friendly technologies. Different applications of BESs are able to effectively minimize wastes and treat wastewater while simultaneously recovering electricity, biohydrogen and other value-added chemicals via specific redox reactions. Although there are many studies that have greatly advanced the performance of BESs over the last decade, research and reviews on agriculture-relevant applications of BESs are very limited. Considering the increasing demand for food, energy and water due to human population expansion, novel technologies are urgently needed to promote productivity and sustainability in agriculture. Methodology: This review study is based on an extensive literature search regarding agriculture-related BES studies mainly in the last decades (i.e., 2009–2018). The databases used in this review study include Scopus, Google Scholar and Web of Science. The current and future applications of bioelectrochemical technologies in agriculture have been discussed. Findings/Conclusions: BESs have the potential to recover considerable amounts of electric power and energy chemicals from agricultural wastes and wastewater. The recovered energy can be used to reduce the energy input into agricultural systems. Other resources and value-added chemicals such as biofuels, plant nutrients and irrigation water can also be produced in BESs. In addition, BESs may replace unsustainable batteries to power remote sensors or be designed as biosensors for agricultural monitoring. The possible applications to produce food without sunlight and remediate contaminated soils using BESs have also been discussed. At the same time, agricultural wastes can also be processed into construction materials or biochar electrodes/electrocatalysts for reducing the high costs of current BESs. Future studies should evaluate the long-term performance and stability of on-farm BES applications.

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Impact of Treatment Strategies on Biohydrogen Production from Waste‐Activated Sludge Fermentation

Kulkarni¹,

Dhanyashree²,

Varma³

et al. 2023

Materials for Hydrogen Production, Conversion, and Storage

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Hydrogen production from buffer-free anaerobic fermentation liquid of waste activated sludge using microbial electrolysis system

Cited by 15 publications

References 28 publications

Semiquantitative Detection of Hydrogen-Associated or Hydrogen-Free Electron Transfer within Methanogenic Biofilm of Microbial Electrosynthesis

Semiquantitative Detection of Hydrogen-Associated or Hydrogen-Free Electron Transfer within Methanogenic Biofilm of Microbial Electrosynthesis

Applications of Emerging Bioelectrochemical Technologies in Agricultural Systems: A Current Review

Impact of Treatment Strategies on Biohydrogen Production from Waste‐Activated Sludge Fermentation

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