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Cited by 32Composting and Vermicomposting TechniquesInvertebrate Taxonomy and EcologySoil Carbon and Nitrogen Dynamics

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Conversion of spent coffee grounds into vermicompost

Hanc, Ales, Hrebeckova, Tereza, Grasserova, Alena, Cajthaml, Tomas·2021·Bioresource Technology
DOI 10.1016/j.biortech.2021.125925
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Abstract

The present study was focused on vermicomposting of spent coffee grounds (SCG) and its mixtures with straw pellets. The process was evaluated in terms of biological and physico-chemical properties. The greatest number and biomass of earthworms was found in the treatment with 25% vol. SCG + 75% vol. straw pellets. In this treatment, the upper youngest layer exhibited 1.6-fold and 4.5-fold greater earthworm number and biomass, respectively, than the bottom oldest layer. Earthworm weight decreased in direct proportion to the layer age. The oldest treatment layer was characterized by lesser contents of fungi and six hydrolytic enzymes, compared to the younger layers. Further, the oldest treatment layer had suitable agrochemical properties. Earthworms were able to substantially reduce the caffeine stimulant content, which is considered the most representative pharmaceutically active compound.

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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 [56]

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Research works printed but not linked: 45

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Metadata

Authors
Hanc, A., Hrebeckova, T., Grasserova, A., & Cajthaml, T.
Venue
Bioresource Technology
Publisher
Elsevier BV
Published
2021-12
Volume
341
Pages
125925
ISSN
0960-8524 (ISSN-L)
DOI
10.1016/j.biortech.2021.125925
OpenAlex
W3199117848
Cited by
32
References
2
Citations by year
2026: 3 · 2025: 5 · 2024: 7 · 2023: 10 · 2022: 6 · 2021: 1
FWCI
3.50
Type
journal article
Language
en
Open access
closed
Licence
Locations
  • Bioresource Technology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Ministerstvo Zemědělství (QK1910095)
  • Národní agentura pro zemědělský výzkum (QK1910095)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Composting and Vermicomposting Techniques
  • Life Sciences › Agricultural and Biological Sciences › Ecology, Evolution, Behavior and Systematics › Invertebrate Taxonomy and Ecology
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
Keywords
spent coffee grounds, vermicomposting, earthworms, straw pellets, caffeine removal, hydrolytic enzymes, agrochemical properties, waste valorization
MeSH terms
Composting, Coffee

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