Evaluation of three composting systems for the management of spent coffee grounds
Abstract
This study was conducted to evaluate the optimum composting approach for the management of spent coffee grounds from the restaurant and ready-to-serve coffee industry. Three composting systems were assessed, including in-vessel composting, vermicomposting bins, and aerated static pile bin composting, over study periods ranging from 47 to 98 days. Total carbon content was reduced by 5-7% in the spent coffee ground treatments across the three composting systems. Nitrogen and other mineral nutrient contents were conserved or enhanced from the initial to the final composts in all the composting systems assessed. Earthworm growth and survival (15-80%) was reduced in all the treatments but mortality rates were lower in coffee treatments with cardboard additions. A decline in earthworm mortality with cardboard additions was the result of reduced exposure to organic compounds and chemicals released through the decomposition of spent coffee grounds.
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Composting SCG (including vermicomposting) reduces SCG inhibitory effects on other plants, including lettuce, attributed to limitation of microbial activity, chelating of caffeine and other toxins, neutralizing pH, and reduction in C:N ratios.
“Previous studies have shown that composting SCG (including vermicomposting) similarly reduced SCG inhibitory effects on other plants, including lettuce.This has been attributed to the limitation of microbial activity, the chelating of caffeine and other toxins, neutralizing pH, and a reduction in C:N ratios [27,28,31,55,56].”
From Spent Coffee Grounds Applied as a Top-Dressing or Incorporated into the Soil Can Improve Plant Growth While Reducing Slug Herbivory (2023) · cites this paper as [31]
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Effects of earthworm casts and compost on soil microbial activity and plant nutrient availability
Chaoui, H. I., Zibilske, L. M., & Ohno, T. (2003) · Soil Biology and Biochemistry · doi:10.1016/s0038-0717(02)00279-1 · Cited by 342 · see citing works
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Spent coffee grounds by-products and their influence on soil C–N dynamics
Cervera-Mata, A., Delgado, G., Fernández-Arteaga, A., Fornasier, F., & Mondini, C. (2022) · Journal of Environmental Management · doi:10.1016/j.jenvman.2021.114075 · Cited by 63 · see citing works
Cervera-Mata, A., Navarro-Alarcón, M., Rufián-Henares, J. Á., Pastoriza, S., Montilla-Gómez, J., & Delgado, G. (2020) · Science of The Total Environment · doi:10.1016/j.scitotenv.2020.137247 · Cited by 63 · see citing works
Horgan, F. G., Floyd, D., Mundaca, E. A., & Crisol-Martínez, E. (2023) · Agriculture · doi:10.3390/agriculture13020257 · Cited by 38 · see citing works
Satho, T., Dieng, H., Ahmad, M. H. I., Ellias, S. B., Hassan, A. A., Abang, F., Ghani, I. A., Miake, F., Ahmad, H., Fukumitsu, Y., et al. (2015) · Parasites & Vectors · doi:10.1186/s13071-015-0874-6 · Cited by 31 · see citing works
- Authors
- Liu, K., & Price, G. W.
- Corresponding author
- Price, G.W.
- ORCID
- Price, G.W.
- Venue
- Bioresource Technology
- Publisher
- Elsevier BV
- Published
- 2011-09
- Volume
- 102
- Issue
- 17
- Pages
- 7966-7974
- ISSN
- 0960-8524 (ISSN-L)
- OpenAlex
- W2033504458
- Cited by
- 138
- References
- 1
- Citations by year
- 2026: 8 · 2025: 7 · 2024: 10 · 2023: 9 · 2022: 14 · 2021: 22 · 2020: 12 · 2019: 7 · 2018: 7 · 2017: 9 · 2016: 12 · 2015: 8 · 2014: 5 · 2013: 5 · 2012: 3
- FWCI
- 6.47
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Bioresource Technology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Composting and Vermicomposting Techniques
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
- Physical Sciences › Environmental Science › Waste Management and Disposal › Waste Management and Recycling
- Keywords
- spent coffee grounds, composting systems, in-vessel composting, vermicomposting, earthworm mortality, nitrogen retention, carbon emission reduction, restaurant waste, coffee industry waste, organic waste management
- MeSH terms
- Animals, Carbon, Coffee, Electric Conductivity, Hydrogen-Ion Concentration, Nitrogen, Oligochaeta, Soil, Temperature
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