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Evaluating the effects of micro-zones of granular sludge on one-stage partial nitritation-anammox nitrogen removal
Li, Hanxiang1; Wang, Shuai1; Zhao, Fan1; Fang, Fang1; Chen, Youpeng1; Yan, Peng1; Yang, Jixiang1,2; Gu, Shujun1; Guo, Jinsong1
2020-02-04
摘要The one-stage partial nitritation-anammox (PN-A) process is considered an efficient process for low-cost nitrogen removal. In this study, the nitrogen removal performance of different-sized granules in a one-stage PN-A reactor was studied. The total autotrophic nitrogen removal rate (TANRR) of the granular sludge increased as the granule size increased, and the TANRR of granular sludge with a radius larger than 500 mu m reached 0.14 kgN kgVSS(-1) d(-1). High-throughput sequencing revealed that the abundance of ammonium-oxidizing bacteria and anaerobic ammonium-oxidizing (anammox) bacteria in granular sludge of different sizes differed, indicating that the bacterial community structure was affected by the granule size. The TANRR of different-sized granules was affected by the volumes of aerobic micro-zone and anaerobic micro-zone inside the granule. Appropriate micro-zone volumes inside the granules could be regulated by the dissolved oxygen (DO) concentration of the reactor, which are favourable for achieving a balance between partial nitritation and anammox and then satisfactory nitrogen removal. Small-volume variations in the range of micro-zones have a significant influence on the balance between partial nitritation and anammox. The proper DO concentration required for different-sized granules to achieve better nitrogen removal differed. This study provides a novel perspective for understanding the effect of micro-zones of granular sludge on one-stage PN-A nitrogen removal.
关键词Micro-zone One stage Partial nitritation Anammox Granular sludge
DOI10.1007/s00449-020-02302-y
发表期刊BIOPROCESS AND BIOSYSTEMS ENGINEERING
ISSN1615-7591
页码13
通讯作者Fang, Fang(fangfangcq@cqu.edu.cn)
收录类别SCI
WOS记录号WOS:000511050300002
语种英语