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Suppression of methanogenesis in hydrogen fermentation by intermittent feeding
- Suppression of methanogenesis in hydrogen fermentation by intermittent feeding
- Yun, Jeonghee; Kim, Tae Gwan; Cho, Kyung-Suk
- Ewha Authors
- 조경숙; 김태관
- SCOPUS Author ID
- Issue Date
- Journal Title
- JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
- 1093-4529; 1532-4117
- vol. 50, no. 14, pp. 1458 - 1467
- Biohydrogen; hydrogenesis; inhibition; intermittent feeding; methanogen
- TAYLOR & FRANCIS INC
- SCI; SCIE; SCOPUS
- This study investigated whether intermittent feeding by using a concentrated carbon source is an appropriate method for selective enrichment of hydrogenesis by means of methanogen suppression. In a conventional reactor fed continuously for 10 d, methanogens increased from 2.8 x 10(7) to 1.1 x 10(9) gene copy number (GCN)/mg-cell dry weight, and methane concentration in the resulting biogas was 5.8%. However, when a carbon source was intermittently supplied for 10 d to the reactor, the number of methanogens was reduced 98.9% from 2.77 x 10(7) to 1.2 x 10(3) GCN/mg-cell dry weight, and methane was not detected during this period of intermittent feeding. Intermittent feeding shifted the dominants in the reactor from Clostridiaceae (70.5%) and Lactobacillaceae (11.0%) to Acetobacteraceae (62.0%) and Clostridiaceae (38.0%). In the reactor operated in continuous feeding mode after intermittent feeding, methane concentration was below 0.3% and the portion of methanogens in the bacterial community was maintained below 0.2%. These results suggest that the intermittent feeding of a carbon source during hydrogen production processes is a suitable method to suppress the activity of methanogens.
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