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Long-term survival of methanogens of an anaerobic digestion sludge under starvation and temperature variation
- Long-term survival of methanogens of an anaerobic digestion sludge under starvation and temperature variation
- Kim, Tae Gwan; Yi, Taewoo; Lee, Jung-Hee; Cho, Kyung-Suk
- Ewha Authors
- 조경숙; 이태우; 김태관
- SCOPUS Author ID
- Issue Date
- Journal Title
- JOURNAL OF ENVIRONMENTAL BIOLOGY
- vol. 36, no. 2, pp. 371 - 375
- Methanogens; Population dynamics; Starvation; Temperature
- TRIVENI ENTERPRISES
- SCIE; SCOPUS
- To investigate starvation effect on methanogen community, two identical membrane reactors were continuously operated for 84 consecutive days, with a temperature change from 50 degrees C to 20 degrees C. Continuous feeding washed out 97% biomass from reactors during the experimental period. Quantitative PCR, using mcrA genes, indicated that the methanogen abundance decreased from 7.0x10(7) to 1.2x10(7) marA copies.ml(-1) (volume basis) at 50 degrees C, and then increased to 4.4 x10(7) mcrA copies.mr at 20 degrees C (p<0.05). Correspondence analysis indicated that methanogen communities were distinctly grouped by each temperature. Canonical correspondence analysis indicated that temperature showed a significant correlation with the methanogen community composition. These results suggest that methanogens can survive for a long time (at least more than 84 days) under starvation conditions, and that temperature could be a primary factor determining the density and community of methanogens.
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