Long-term survival of methanogens of an anaerobic digestion sludge under starvation and temperature variation
- 주제(키워드) Methanogens , Population dynamics , Starvation , Temperature
- 등재 SCIE, SCOPUS
- 발행기관 TRIVENI ENTERPRISES
- 발행년도 2015
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000115035
- 본문언어 영어
초록/요약
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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