Characterization of food waste as feedstock for anaerobic digestion
Abstract
Food waste collected in the City of San Francisco, California, was characterized for its potential for use as a feedstock for anaerobic digestion processes. The daily and weekly variations of food waste composition over a two-month period were measured. The anaerobic digestibility and biogas and methane yields of the food waste were evaluated using batch anaerobic digestion tests performed at 50 degrees C. The daily average moisture content (MC) and the ratio of volatile solids to total solids (VS/TS) determined from a week-long sampling were 70% and 83%, respectively, while the weekly average MC and VS/TS were 74% and 87%, respectively. The nutrient content analysis showed that the food waste contained well balanced nutrients for anaerobic microorganisms. The methane yield was determined to be 348 and 435 mL/gVS, respectively, after 10 and 28 days of digestion. The average methane content of biogas was 73%. The average VS destruction was 81% at the end of the 28-day digestion test. The results of this study indicate that the food waste is a highly desirable substrate for anaerobic digesters with regards to its high biodegradability and methane yield.
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Using food waste as an alternative energy source reduces the amount of waste going to landfill and diminishes associated problems of gas emissions and groundwater contamination.
“Using food waste as an alternative energy source has the advantage of reducing the amount of waste going to landfill and diminishing the associated problems of gas emissions and groundwater contamination [29, 30].”
From Progress towards Sustainable Utilisation and Management of Food Wastes in the Global Economy (2016) · cites this paper as [30]
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- Authors
- ZHANG, R., ELMASHAD, H., HARTMAN, K., WANG, F., LIU, G., CHOATE, C., & GAMBLE, P.
- Affiliations
- University of California System (US)
- University of California, Davis (US)
- Corresponding author
- ZHANG, R
- Venue
- Bioresource Technology
- Publisher
- Elsevier BV
- Published
- 2007-03
- Volume
- 98
- Issue
- 4
- Pages
- 929-935
- ISSN
- 0960-8524 (ISSN-L)
- OpenAlex
- W1968484807
- Cited by
- 1,033
- References
- 16
- Citations by year
- 2026: 36 · 2025: 36 · 2024: 44 · 2023: 53 · 2022: 62 · 2021: 70 · 2020: 72 · 2019: 93 · 2018: 72 · 2017: 103 · 2016: 73 · 2015: 75 · 2014: 77 · 2013: 48 · 2012: 41
- FWCI
- 35.03
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Bioresource Technology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- California Energy Commission
- University of California, Davis
- Topics
- Physical Sciences › Engineering › Building and Construction › Anaerobic Digestion and Biogas Production
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Composting and Vermicomposting Techniques
- Physical Sciences › Environmental Science › Waste Management and Disposal › Landfill Environmental Impact Studies
- Keywords
- food waste, anaerobic digestion, biogas yield, methane yield, moisture content, volatile solids, nutrient content, biodegradability, waste composition, municipal solid waste
- MeSH terms
- Anaerobiosis, Culture Media, Food, Methane
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