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Conversion of spent coffee grounds into vermicompost

A. Hanc, T. Hrebeckova, A. Grasserova, T. Cajthaml

. 2021 ; 341 (-) : 125925. [pub] 20210913

Language English Country Great Britain

Document type Journal Article

Persistent link   https://www.medvik.cz/link/bmc22003056

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