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Suppression of methanogenesis in hydrogen fermentation by intermittent feeding

Title
Suppression of methanogenesis in hydrogen fermentation by intermittent feeding
Authors
Yun, JeongheeKim, Tae GwanCho, Kyung-Suk
Ewha Authors
조경숙김태관
SCOPUS Author ID
조경숙scopus
Issue Date
2015
Journal Title
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
ISSN
1093-4529JCR Link1532-4117JCR Link
Citation
vol. 50, no. 14, pp. 1458 - 1467
Keywords
Biohydrogenhydrogenesisinhibitionintermittent feedingmethanogen
Publisher
TAYLOR & FRANCIS INC
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
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.
DOI
10.1080/10934529.2015.1074480
Appears in Collections:
엘텍공과대학 > 환경공학전공 > Journal papers
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