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Long-term survival of methanogens of an anaerobic digestion sludge under starvation and temperature variation

Title
Long-term survival of methanogens of an anaerobic digestion sludge under starvation and temperature variation
Authors
Kim, Tae GwanYi, TaewooLee, Jung-HeeCho, Kyung-Suk
Ewha Authors
조경숙이태우김태관
SCOPUS Author ID
조경숙scopus
Issue Date
2015
Journal Title
JOURNAL OF ENVIRONMENTAL BIOLOGY
ISSN
0254-8704JCR Link
Citation
vol. 36, no. 2, pp. 371 - 375
Keywords
MethanogensPopulation dynamicsStarvationTemperature
Publisher
TRIVENI ENTERPRISES
Indexed
SCIE; SCOPUS WOS scopus
Abstract
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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엘텍공과대학 > 환경공학전공 > Journal papers
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