Enhanced Methane Production with Co-feeding Spent Coffee Grounds Using Spare Capacity of Existing Anaerobic Food Waste Digesters

Overview

Journal Sci Rep

Specialty Science

Date 2024 Feb 23

PMID 38396086

Authors

Danbee Kim

Junho Cha

Changsoo Lee

Affiliations

Soon will be listed here.

Abstract

With increasing coffee consumption worldwide, the efficient and sustainable management of spent coffee grounds (SCG) has become increasingly challenging. This study investigated the anaerobic co-digestion of small amounts of SCG with food waste (FW) at increasing co-feeding ratios of 1:100-1:10 (volatile solids basis) to assess the possibility of SCG treatment using the spare capacity of existing anaerobic digesters. Co-feeding SCG increased methane production compared to FW mono-digestion in the tested range of co-feeding ratios without compromising process stability. Methane yield did not further increase when the SCG/FW ratio increased above 4%, and process failure occurred at a 1:10 co-feeding ratio without trace element supplementation. The enhanced methanogenic performance was attributed to increased protein removal efficiency, which was potentially related to the promotion of peptide hydrolysis. The overall results suggest that co-feeding appropriate small amounts of SCG to FW digesters can be a realistic sustainable option for SCG management.

Citing Articles

TEMPO-oxidized cellulose fiber from spent coffee ground: Studying their properties as a function of particle size.

Rahmani Khoshk H, Moeenfard M Heliyon. 2025; 11(1):e41646.

PMID: 39866449 PMC: 11757758. DOI: 10.1016/j.heliyon.2025.e41646.

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