Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, School of Hydraulic and Environmental Engineering, Changsha University of Science and Technology, Changsha 410004, China; Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences Beijing 100085, China.
Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, School of Hydraulic and Environmental Engineering, Changsha University of Science and Technology, Changsha 410004, China.
Bioresour Technol. 2022 Jul;355:127261. doi: 10.1016/j.biortech.2022.127261. Epub 2022 May 5.
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/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.
单级自养脱氮 (ANR) 工艺受到启动周期长和运行不稳定的限制。本研究采用气升式内循环分区生物反应器 (AIPBR) 连续运行 215 天，探索强化单级 ANR 系统性能和稳定运行的方法。AIPBR 的启动期约为 38 天，第 35 天总氮去除率>85%。随着水力停留时间的缩短和曝气量的增加，氮去除率增加到 0.85±0.02kg-N/m/d。污泥形态逐渐变为暗红色絮状-颗粒污泥。污泥中优势菌为亚硝化单胞菌（9.95%）和卡氏菌（6.41%）。在长期运行过程中，AIPBR 实现了污水和污泥的双重内循环，然后形成有效的溶解氧和污泥分区，为各种功能菌提供适宜的生长环境，促进它们之间的协同作用，强化 ANR 性能。
