期刊
BIORESOURCE TECHNOLOGY
卷 251, 期 -, 页码 327-333出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.12.079
关键词
Partial nitritation/anammox; Mainstream; Nitrogen removal; Microbial community
资金
- National Natural Science Foundation of China [51478013, 21777005]
- Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [QAK201502]
This study investigated the microbial evolution in a mainstream partial nitritation/anammox (PN/A) reactor started by inoculation from sidestream PN/A. The reactor was fed with pre-treated sewage and operated for 120 days at room temperature (24-26 degrees C). It was found that for both sidestream and mainstream PN/A, anammox bacteria preferentially grew in granular sludge while ammonium-oxidizing bacteria (AOB) were mainly resided in flocculent sludge. After 120 days operation, the abundance of anammox bacteria in the reactor decreased from 6.6 x 10(11) to 3.2 x 10(11) copies/L. Besides, a shift of dominant anammox genera from Ca. Brocadia to Ca. Kuenenia was observed. In contrast, the dominant genera of AOB was Nitrosomonas throughout the operation. Furthermore, high-throughput sequencing revealed that heterotrophs constitute the majority of microorganisms in PN/A reactor. Especially, Chloroflexi, which can utilize cell decay materials from autotrophs, were enriched under mainstream conditions. This study provided a better understanding of the microorganisms in mainstream PN/A process.
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