Anaerobic co-digestion of spent coffee grounds with different waste feedstocks for biogas production. (February 2017)

• Record Type: Journal Article
• Authors: Kim, Jaai; Kim, Hakchan; Baek, Gahyun; Lee, Changsoo
• Is Part Of: Waste management. Volume 60(2017)
• Page Start: 322
• Page End: 328
• Publication Date: 2017-02
• Subjects: Anaerobic co-digestion -- Biochemical methane potential -- Kinetic modeling -- Spent coffee grounds; Hazardous wastes -- Periodicals; Refuse and refuse disposal -- Periodicals; 363.728
• DOI: 10.1016/j.wasman.2016.10.015
• Languages: English
• ISSNs: 0956-053X

Abstract

Highlights: The feasibility of the co-digestion of SCG with various organic wastes was studied. FW, Ulva, and whey enhanced the reaction rate without a significant loss in BMP. Co-digestion with WAS had an apparent antagonistic effect on methane production. The microbial community structure varied little with different substrate mixtures. Abstract: Proper management of spent coffee grounds has become a challenging problem as the production of this waste residue has increased rapidly worldwide. This study investigated the feasibility of the anaerobic co-digestion of spent coffee ground with various organic wastes, i.e., food waste, Ulva, waste activated sludge, and whey, for biomethanation. The effect of co-digestion was evaluated for each tested co-substrate in batch biochemical methane potential tests by varying the substrate mixing ratio. Co-digestion with waste activated sludge had an apparent negative effect on both the yield and production rate of methane. Meanwhile, the other co-substrates enhanced the reaction rate while maintaining methane production at a comparable or higher level to that of the mono-digestion of spent coffee ground. The reaction rate increased with the proportion of co-substrates without a significant loss in methanation potential. These results suggest the potential to reduce the reaction time and thus the reactor capacity without compromising methane production.