WANGGang,YUANLin-jiang,WANGRu,et al.Rapid Start-up of Anammox Seeded with A2/O Return Sludge and Its Kinetic Characteristics[J].China Water & Wastewater,2023,39(9):1-9.
Rapid Start-up of Anammox Seeded with A2/O Return Sludge and Its Kinetic Characteristics
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第9期
Page:
1-9
Column:
Date of publication:
2023-05-01
- Abstract:
- In an upflow anaerobic sludge bed (UASB) reactor seeded with A2/O return sludge from a municipal sewage treatment plant, Anammox was rapidly started by gradually increasing influent substrate concentration and shortening hydraulic residence time (HRT). The nitrogen removal performance of the reactor and the difference of microbial community structure before and after start-up were analyzed. It took only 40 days to start the reactor successfully. The removal rates of ammonia nitrogen and nitrite nitrogen remained above 90%, the maximum total nitrogen removal load was 0.99 kg/(m3·d), and the ratio of ΔNH4+-N, ΔNO2--N and ΔNO3--N was 1∶1.28∶0.26. During the start-up process, the contribution of denitrification to the removal of total nitrogen gradually decreased from 83% to 12%, and the cell yield of Anammox bacteria reached (1.37-13.75)×1010 cells/d at the end of the activity retardation period. At the start-up initial stage, the main Anammox bacteria were Candidatus Brocadia (25.14%) and Candidats Jettenia (2.92%). During the long-term operation, the abundance of Candidats Jettenia gradually increased to 12.67% and became the dominant bacteria. The modified Stover-Kincannon substrate removal model (R2 of 0.983 3) and Grau second-order kinetic model (R2 of 0.992 8) were suitable for predicting the nitrogen removal performance and substrate removal efficiency of Anammox reactor, while the R2 fitted by Monod model was only 0.820 6, indicating that it was not suitable to describe the nitrogen removal performance of UASB-Anammox reactor under different HRTs.
Last Update:
2023-05-01