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Co-feeding spent coffee grounds in anaerobic food waste digesters: Effects of co-substrate and stabilization strategy.

Authors
  • Kim, Danbee1
  • Kim, Hakchan2
  • Kim, Jaai1
  • Lee, Changsoo3
  • 1 School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan 44919, Republic of Korea. , (North Korea)
  • 2 Process Research Team, Institute of Environmental Tech, LG-Hitachi Water Solutions, 51 Gasan Digital 1-ro, Geumcheon-gu, Seoul 08592, Republic of Korea. , (North Korea)
  • 3 School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan 44919, Republic of Korea. Electronic address: [email protected] , (North Korea)
Type
Published Article
Journal
Bioresource technology
Publication Date
Sep 01, 2019
Volume
288
Pages
121594–121594
Identifiers
DOI: 10.1016/j.biortech.2019.121594
PMID: 31176937
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Anaerobic digestion of spent coffee grounds (SCG) is considered disadvantageous, particularly under mono-digestion conditions, owing to slow degradation and nutrient imbalance. This study investigated the effect of co-feeding of SCG at a low ratio into food waste (FW) digesters, with the aim to determine whether SCG can be effectively treated and valorized using the spare capacity of existing digesters. Duplicate reactors showed stable performance under FW mono-digestion conditions but manifested severe deterioration in three volume turnovers after co-feeding of SCG (FW:SCG at 10:1 on a volatile solids basis). The reactors failed to recover despite repeated interrupted feeding and stabilization, and Ulva was added (FW:SCG:Ulva at 20:2:1) for nutrient supplementation. The two reactors subjected to different stabilization strategies (i.e., timing and intervals of interrupted feeding) responded differently to Ulva co-feeding: one recovered and maintained stable albeit suboptimal performance, whereas the other failed. Furthermore, the microbial communities developed differently in the reactors. Copyright © 2019 Elsevier Ltd. All rights reserved.

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