Methane production in an UASB reactor operated under periodic mesophilic-thermophilic conditions |
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Authors: | Bourque J-S Guiot S R Tartakovsky B |
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Institution: | Biotechnology Research Institute, NRC, 6100 Royalmount Ave, Montréal, QC, Canada H4P 2R2. |
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Abstract: | Methane production was studied in a laboratory-scale 10 L anaerobic upflow sludge bed (UASB) reactor with periodic variations of the reactor temperature. On a daily basis the temperature was varied between 35 and 45 degrees C or 35 and 55 degrees C with a heating period of 6 h. Each temperature increase was accompanied by an increase in methane production and a decrease in the concentration of soluble organic matter in the effluent. In comparison to a reactor operated at 35 degrees C, a net increase in methane production of up to 22% was observed. Batch activity tests demonstrated a tolerance of mesophilic methanogenic populations to short-term, 2-6 h, temperature increases, although activity of acetoclastic methanogens decreased after 6 h exposure to a temperature of 55 degrees C. 16S sequencing of DGGE bands revealed proliferation of temperature-tolerant Methanospirillum hungatii sp. in the reactor. |
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Keywords: | periodic operation temperature thermophilic–mesophilic consortium anaerobic degradation |
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