Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8869461 | Waste Management | 2018 | 12 Pages |
Abstract
This study compared single- versus two-phase systems for semi-continuous anaerobic digestion of food waste without pH control at varying organic loading rates (OLRs). The methanogenic reactors of both systems required trace element supplementation for stable operation at 3.0â¯g VS (volatile solids)/Lâd or higher OLRs. Under trace-element supplemented conditions, both systems achieved stable and efficient performance at OLRs up to 4.0â¯g VS/Lâd. The two-phase system outperformed the single-phase system at 1.0-4.0â¯g VS/Lâd OLRs, but it failed at an OLR of 5.0â¯g VS/Lâd. Meanwhile, the single-phase system maintained the stable performance and reached its maximum methane production at this OLR. These results suggest that a single-phase configuration is more advantageous for robust treatment of food waste without pH control at high organic and hydraulic loads. Hydrogenotrophic methanogens dominated the methanogen community throughout the experiment in both systems. Microbial community structure shifts correlated with reactor operation and performance characteristics.
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Authors
Yeadam Jo, Jaai Kim, Kwanghyun Hwang, Changsoo Lee,