期刊
BIORESOURCE TECHNOLOGY
卷 334, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.125249
关键词
IFAS; Carrier type; Partial nitritation; anammox; Partial denitrification; anammox; Microbial diversity
资金
- National Natural Science Foundation of China [51978007]
- Funding Projects of Beijing Municipal Commission of Education
This study analyzed and compared the biofilm structure, performance, and nitrogen removal pathways of microporous and macroporous carriers from a full-scale partial nitritation/anammox reactor. Microporous carriers had thicker biofilms, higher biomass, and nitrogen removal efficiency due to the integration of denitrifying and anammox bacteria, while macroporous carriers had thinner biofilms, lower microbial richness, but strong network correlation among genera.
In this study, two typical carrier types, microporous and macroporous carriers, were collected from a full-scale partial nitritation/anammox reactor for analysis and comparison of the biofilm structure characteristics, performance and removal nitrogen pathway. For microporous carriers, a thicker biofilm (>5 mm) was obtained with higher biomass and abundance of anammox bacteria as well as a higher nitrogen removal efficiency due to the integration of denitrifying and anammox bacteria. In addition, higher microbial community stability can be expected under varying environmental conditions. In comparison, macroporous carrier biofilm exhibited a lower thickness (0.4-2.3 mm) and lower microbial richness, with a strong network correlation among genera. Analysis showed that the mainly positive correlation between anammox bacteria and ammonium oxidizing bacteria, enhancing coupling partial nitritation and anammox. These findings help further our understanding of the mechanisms of anammox biofilm nitrogen removal and provide a baseline for optimization of the design of carrier structures.
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