期刊
BIORESOURCE TECHNOLOGY
卷 355, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127261
关键词
Autotrophic nitrogen removal; Anammox; Multi-partition; Dual inner circulation; Airlift
资金
- China Hunan Provincial Science & Technology Department [2022SK2091, 2020JJ4602, 2019JJ50646]
- Hunan Provincial Department of Education [20A002, 20C0017]
- Ecology and Environment Department of Hunan
In this study, an airlift inner-circulation partition bioreactor (AIPBR) was operated continuously for 215 days to explore methods of strengthening the performance and stable operation of the single-stage autotrophic nitrogen removal (ANR) system. The nitrogen removal rate increased with the decrease of hydraulic retention time and the increase of aeration rate, and the sludge morphology gradually changed, providing a suitable growth environment for various functional bacteria and promoting the ANR performance.
The single-stage autotrophic nitrogen removal (ANR) process is impeded by a long start-up cycle and unstable operation performance. In this study, an airlift inner-circulation partition bioreactor (AIPBR) was operated continuously for 215 days to explore methods of strengthening the performance and stable operation of the single-stage ANR system. AIPBR start-up period took around 38 days, the total nitrogen removal efficiency was > 85% on day 35. With the decrease of hydraulic retention time and the increase of aeration rate, the nitrogen removal rate increased to 0.85 +/- 0.02 kg-N/m(3)/day. The sludge morphology gradually changed into dark-red floc-coupled granular sludge. Nitrosomonas (9.95%) and Candidatus Brocadia (6.41%) were dominant in the sludge. During long-term operation, AIPBR achieved the dual inner circulation of sewage and sludge and then formed effective dissolved oxygen and sludge partitions to provide a suitable growth environment for various functional bacteria, promote synergy between them, and strengthen the ANR performance.
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