Comparison of single-stage and two-stage thermophilic anaerobic digestion of SS-OFMSW during the start-up phase
KAUST DepartmentEnvironmental Science and Engineering Program
Water Desalination and Reuse Research Center (WDRC)
Biological and Environmental Sciences and Engineering (BESE) Division
Online Publication Date2019-12-05
Print Publication Date2020-12
Embargo End Date2020-12-04
Permanent link to this recordhttp://hdl.handle.net/10754/660424
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AbstractThe 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 vs. two-stage thermophilic digesters, fed with SS-OFMSW, were examined during the startup phase while increasing the loading rate from 0.5 to ~2 g VS.L-1d-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 16 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.
CitationGhanimeh, S., Al-Sanioura, D., Saikaly, P. E., & El-Fadel, M. (2019). Comparison of Single-Stage and Two-Stage Thermophilic Anaerobic Digestion of SS-OFMSW During the Start-Up Phase. Waste and Biomass Valorization, 11(12), 6709–6716. doi:10.1007/s12649-019-00891-8
SponsorsThis research was supported by a grant from the National Council for Scientific Research, Lebanon. Special thanks are extended to the United States Agency for International Development for its support in acquiring the equipment used in the experimental program.
JournalWaste and Biomass Valorization