Effect of ultrasonic pretreatment on chain elongation of saccharified residue from food waste by anaerobic fermentation
Abstract
Converting biowaste into value-added products has raised the researchers' interests. In this study, bioconversion was applied to produce chain acids from food waste by anaerobic fermentation. To improve the caproic acid production, different pretreatments (i.e., ultrasonic, hydrothermal, and alkaline-thermal) were used for investigating their effects on the acidogenic production and microbial communities. The results showed that ultrasonic and hydrothermal pretreatments (207.8 and 210.1 mg COD/g VS, respectively) were very efficient for enhancing the caproic acid production, compared to the alkaline-thermal pretreated samples and control samples (72.6 and 97.5 mg COD/g VS, respectively). The ultrasonic pretreatment was beneficial for reducing volatile fatty acids (VFAs) during the caproic acid production, resulting in converting more lactic acid to caproic acid by adding the hydrothermal pretreatment. The microbial community analysis showed that the acidogenic bacteria Caproiciproducens dominated the fermentation in this bioconversion process of food waste into chain acids. The Caproiciproducens mainly degraded the proteins and carbohydrates from the saccharified residues of food waste to produce caproic acids through chain elongation procedure. The investigation and optimized method may help develop the bioconversion technology for producing VFAs products from food wastes.
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Production of caproic acid was enhanced by ultrasonic pretreatment (207.8 mg COD/g VS) and hydrothermal pretreatments (210.1 mg COD/g VS) of food waste compared with alkali thermal pretreatments during acidogenic fermentation by Caproiciproducens.
“Production of caproic acid was enhanced by ultrasonic pretreatment (207.8 mg COD/g VS) and hydrothermal pretreatments (210.1 mg COD/g VS) of food waste compared with alkali thermal pretreatments during acidogenic fermentation by Caproiciproducens [93].”
From Food Waste Biorefinery: Pathway towards Circular Bioeconomy (2021) · cites this paper as [93]
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- Authors
- Ma, H., Lin, Y., Jin, Y., Gao, M., Li, H., Wang, Q., Ge, S., Cai, L., Huang, Z., Van Le, Q., & Xia, C.
- Affiliations
- University of Science and Technology Beijing (CN)
- Nanjing Forestry University (CN)
- University of North Texas (US)
- Corresponding author
- Xia, Changlei
- Venue
- Environmental Pollution
- Publisher
- Elsevier BV
- Published
- 2021-01
- Volume
- 268
- Issue
- Pt B
- Pages
- 115936
- ISSN
- 0269-7491 (ISSN-L)
- OpenAlex
- W3096614107
- Cited by
- 85
- References
- 58
- Citations by year
- 2026: 7 · 2025: 14 · 2024: 13 · 2023: 20 · 2022: 17 · 2021: 13 · 2020: 1
- FWCI
- 6.75
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Environmental Pollution (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry (CP-2019-YB7)
- Beijing Municipal Science and Technology Commission (Z181100002418016)
- National Key Research and Development Program of China (2019YFC1906302, 2019YFC1906304)
- Fundamental Research Funds for the Central Universities (TW2019014)
- Topics
- Physical Sciences › Engineering › Building and Construction › Anaerobic Digestion and Biogas Production
- Physical Sciences › Engineering › Biomedical Engineering › Biofuel production and bioconversion
- Physical Sciences › Environmental Science › Environmental Engineering › Microbial Fuel Cells and Bioremediation
- Keywords
- ultrasonic pretreatment, hydrothermal pretreatment, food waste, caproic acid production, anaerobic fermentation, chain extension, volatile fatty acids, lactic acid, Caproiciproducens, microbial communities, biomass waste valorization
- MeSH terms
- Anaerobiosis, Fermentation, Food, Hydrogen-Ion Concentration, Refuse Disposal, Sewage, Ultrasonics
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