期刊
BIORESOURCE TECHNOLOGY
卷 272, 期 -, 页码 442-450出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.10.060
关键词
Ammonia removal; Ochrobactrum anthropic; Simultaneous nitrification and denitrification; Nitrite accumulation
资金
- National Nature Science Foundation of China [21677052]
- Major Science and Technology Program for the Industry-Academia-Research Collaborative Innovation [201704020206]
- Guangdong Water Conservancy Science and Technology Innovation Project [2017-25]
- Guangdong Province Science and Technology Project [2016B090918104, 2016B020240005, 2015B020235009]
- Joint fund of Guangdong Province [U1401235]
- Zhanjiang of Guangdong Energy Co. [ZY-KJ-YX-2016X085F]
- Special Fund of Chinese Central Government for Basic Scientific Research Operations in Commonweal Research Institutes [PM-zx097-201701-045]
Nitrogen contaminants are widespread presence in municipal wastewater, heterotrophic nitrification and aerobic denitrification (HN-AD) bacteria have advantages of dealing with multiple nitrogen. Strain LJ81 was isolated from domestic sludge, identified as Ochrobactrum anthropic, which was oxygen-dependent and could survive in a wide range of pH values. Results showed that strain LJ81 could achieve simultaneous nitrification and denitrification (SND) under aerobic condition, whilst more than 80% of initial nitrogen was converted into gaseous nitrogen. The removal rates of ammonia increased from 3.75 to 3.85 and 5.70 mg-N L-1 h(-1) by adding nitrite and nitrate, respectively, while the nitrate denitrification was the rate-limiting step of SND process. Moreover, adding chlorate could inhibit not only the cell growth slightly but also denitrification of nitrate. All results indicated that O. anthropic strain LJ81 exhibited excellent performance on nitrogen removal without nitrite accumulation under aerobic condition.
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