Methane production in an UASB reactor operated under periodic mesophilic–thermophilic conditions
✍ Scribed by J.-S. Bourque; S.R. Guiot; B. Tartakovsky
- Publisher
- John Wiley and Sons
- Year
- 2008
- Tongue
- English
- Weight
- 238 KB
- Volume
- 100
- Category
- Article
- ISSN
- 0006-3592
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✦ Synopsis
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°C or 35 and 55°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°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°C. 16S sequencing of DGGE bands revealed proliferation of temperature‐tolerant Methanospirillum hungatii sp. in the reactor. Biotechnol. Bioeng. 2008;100: 1115–1121. © 2008 Wiley Periodicals, Inc.