Journal
BIORESOURCE TECHNOLOGY
Volume 272, Issue -, Pages 370-378Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.10.046
Keywords
Heterotrophic nitrification; Nitrogen-removal pathway; Feast/famine time ratio; Aerobic granular sludge
Funding
- Fund for the Beijing Excellent Talents by the Beijing Municipal Education Commission, Beijing Youth Top Team Project [2014000026833TD02]
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Aerobic granular sludge was cultivated in three column reactors, which had been operated for 120 days under different feast/famine ratio (1:7, 1:11, 1:15). The composition of total bacteria was analyzed by testing oxygen uptake rates of mixed liquor samples taken from the reactors and calculating according to activated sludge model. The results revealed that long famine phase favored the growth of heterotrophic bacteria. The heterotrophic bacteria accounts for 49.80, 53.37, 91.39% of total bacteria respectively in R-1, R-2 and R-3. The heterotrophic nitrification was also observed in all the reactors, which accounts for 58.62, 58.33, 61.54% of total nitrification respectively in R-1, R-2 and R-3. A novel nitrogen-removal pathway involving simultaneous nitrification-denitrification by heterotrophic nitrification bacteria was proposed. The results revealed that microbial system consisted of heterotrophic ammonia oxidizing bacteria showed stronger capacity of simultaneous nitrification-denitrification.
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