Journal
WASTE AND BIOMASS VALORIZATION
Volume 11, Issue 12, Pages 6709-6716Publisher
SPRINGER
DOI: 10.1007/s12649-019-00891-8
Keywords
Thermophilic anaerobic digestion; Single-stage versus two-stage; SS-OFMSW
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Funding
- National Council for Scientific Research, Lebanon
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The accumulation of volatile fatty acids during the anaerobic digestion of biodegradable substrate such as Source Sorted Organic Fraction of Municipal Solid Waste (SS-OFMSW) is associated with an inhibitory effect on methane producing biochemical pathways. While inconclusive at times, the usage of two-stage digesters has been argued as a potential solution for this issue. In this study single-stage versus two-stage thermophilic digesters, fed with SS-OFMSW, were examined during the startup phase while increasing the loading rate from 0.5 to similar to 2 g VS L-1 d(-1). While both systems exhibited a stable performance, with neutral pH and low intermediate-to-partial alkalinity, the two-stage digester exhibited better effluent quality with 79 and 57% lower average total chemical oxygen demand (TCOD) and soluble COD (SCOD), respectively. Also, upon reaching steady-state conditions, the two-stage system showed a superior performance with an overall methane content of 54%, compared to an average of 45% in the single-stage system.
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