Contribution of electrodes and electric current to process stability and methane production during the electro-fermentation of food waste
Abstract
Electro-fermentation is used as an alternative to conventional anaerobic digestion to enhance system stability and methane production from food waste. In particular, the contributions of electrode materials and an electric current are analyzed separately. The results showed that the introduction of electrodes (conductive carbon brushes without applied voltage) rapidly decreased the average concentration of volatile fatty acids (VFAs) from 6617 mg/L to 174 mg/L quickly, accelerated stabilization of digestion system, and improved methane production by 13.5%. When low voltage was supplied, the VFAs concentration declined to 129 mg/L, and methane production increased by 26.3%. Electric current stimulated the growth of hydrogenotrophic methanogens, but acetotrophic Methanosaeta still made up 27.6-61.9% of archaeal community. Geobacter occurred at the cathode with a low abundance. The energy contained in incremental methane was 4.55 times the consumption of electric energy, indicating the enhanced methanogenesis was mainly attributed to the improved digestion environment.
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About 26.3% improvement in methane production was achieved by limiting the amount of volatile fatty acids to 129 mg/L from electro-fermentation of food waste.
“About 26.3% improvement in the methane production was achieved by limiting the amount of volatile fatty acids to 129 mg/L from the electro-fermentation of food waste [52].”
From Food Waste Biorefinery: Pathway towards Circular Bioeconomy (2021) · cites this paper as [52]
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Food Waste Biorefinery: Pathway towards Circular Bioeconomy
Tsegaye, B., Jaiswal, S., & Jaiswal, A. K. (2021) · Foods · doi:10.3390/foods10061174 · Cited by 191 · see citing works
- Authors
- Liu, S., Deng, Z., Li, H., & Feng, K.
- Affiliations
- Tsinghua Shenzhen International Graduate School (CN)
- Corresponding author
- Li, Huan
- Venue
- Bioresource Technology
- Publisher
- Elsevier BV
- Published
- 2019-09
- Volume
- 288
- Pages
- 121536
- ISSN
- 0960-8524 (ISSN-L)
- OpenAlex
- W2945678203
- Cited by
- 23
- References
- 49
- Citations by year
- 2026: 2 · 2025: 4 · 2024: 1 · 2023: 3 · 2022: 3 · 2021: 4 · 2020: 5 · 2019: 1
- FWCI
- 2.18
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Bioresource Technology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Development and Reform Commission of Shenzhen Municipality
- Major Science and Technology Program for Water Pollution Control and Treatment
- Science and Technology Planning Project of Shenzhen Municipality
- Topics
- Physical Sciences › Engineering › Building and Construction › Anaerobic Digestion and Biogas Production
- Physical Sciences › Environmental Science › Environmental Engineering › Microbial Fuel Cells and Bioremediation
- Physical Sciences › Environmental Science › Waste Management and Disposal › Landfill Environmental Impact Studies
- Keywords
- electro-fermentation, food waste, methane production, process stability, electrode materials, electric current, volatile fatty acids, hydrogenotrophic methanogens, Methanosaeta, Geobacter, cathode, energy efficiency, anaerobic digestion
- MeSH terms
- Anaerobiosis, Electrodes, Fermentation, Methane, Bioreactors
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