Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 687, Issue -, Pages 87-95Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.05.428
Keywords
Thermophilic anaerobic digestion; Start-up; Volatile solids removal; Methane production; Microbial community; Sewage sludge
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2017R1D1A1B03029456]
- National Research Foundation of Korea [2017R1D1A1B03029456] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Effects of two different start-upmethods were compared during conversion from mesophilic to thermophilic anaerobic digestion of sewage sludge. During the batch operation, a transient increase in both total bacterial concentration and relative abundance of thermophilic bacteria in R1 (a one-step increase method) resulted in 34% higher volatile solids (VS) removal efficiency by R1 compared to R2 (a step-wise increase method). Meanwhile, higher total archaeal concentration and increased relative abundance of thermophilic archaea in R2 were attributed to 65% highermethane production by R2 compared to R1. The same trends for VS removal and methane production were observed during the subsequent continuous mode, although the microbial composition of the two reactors became similar. These findings may prove helpful for determining the preferred start-up method for thermophilic anaerobic digestion: a one-step method can be proposed for higher VS removal efficiency, or a step-wise method can be selected for enhanced methane production. (C) 2019 Published by Elsevier B.V.
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