December 8, 2025AgronomyOpen Access

Effect of Composting and Vermicomposting on Microbiological and Chemical Characteristics of Spent Coffee Grounds

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Vermicomposting increased organic matter and diversity in spent coffee grounds compost, suggesting benefits for organic fertilizers.

Compounding with 25–50% spent coffee grounds enhanced organic matter and pH levels, promoting microbial activity.
Organic matter content reached 86–94%, and pH increased from 5.6–6.2 at the start to 7.4–7.7 at the end of composting.
Microbial composting and vermicomposting were compared regarding their toxicity to earthworm Eisenia andrei.
Results highlight how composting can transform spent coffee grounds into beneficial organic fertilizers for plant health.

Smolskii et al. (2025) studied this question.

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December 8, 2025AgronomyOpen Access

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Authors

Vermicomposting increased organic matter and diversity in spent coffee grounds compost, suggesting benefits for organic fertilizers.

Compounding with 25–50% spent coffee grounds enhanced organic matter and pH levels, promoting microbial activity.
Organic matter content reached 86–94%, and pH increased from 5.6–6.2 at the start to 7.4–7.7 at the end of composting.
Microbial composting and vermicomposting were compared regarding their toxicity to earthworm Eisenia andrei.
Results highlight how composting can transform spent coffee grounds into beneficial organic fertilizers for plant health.

Smolskii et al. (2025) studied this question.

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