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- Title
Effect of long-term bioaugmentation on nitrogen removal and microbial ecology for an A O pilot-scale plant operated in low SRT.
- Authors
Pei, Li-Ying; Wan, Qiong; Wang, Zheng-Fu; Wang, Bin-Bin; Zhang, Xin-Yan; Hou, Yin-Ping
- Abstract
The effect of long-term bioaugmentation on nitrogen removal, nitrification activity, and microbial ecology for an anaerobic/anoxic/aerobic (A2O) pilot-scale plant operated in low sludge retention time (SRT) to treat municipal wastewater was investigated. Reject water from sludge treatment was used as a feed to cultivate the nitrifier contained in activated sludge for bioaugmentation. Under the conditions of 10 h hydraulic retention time, 8 d of SRT, and 14°C water temperature ammonia removal efficiency increased by 25%, and specific ammonia utilizing rate and specific nitrite utilizing rate increased by 1.86 and 1.90 times, respectively. The percentages of ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB) in the total number of bacteria increased from 2.4 and 2.1% to 6.8 and 7.8%, respectively. The dominant AOB and NOB were transformed fromNitrosospiraandNitrospiratoNitrosomonas europaeaandNitrobacter.
- Subjects
MUNICIPAL water supply; WASTEWATER treatment; NITROGEN removal (Water purification); NITRIFICATION; SEWAGE purification
- Publication
Desalination & Water Treatment, 2015, Vol 55, Issue 6, p1567
- ISSN
1944-3994
- Publication type
Article
- DOI
10.1080/19443994.2014.928238