Start-up and kinetic characteristics of EGSB-CANON process
SUN Meng-xia, ZHANG Kai, LI Jun, LIANG Dong-bo, WANG Jia
The College of Architecture and Civil Engineering, Beijing University of Technology, National Engineering Laboratory of Urban Sewage Advanced Treatment and Resource Utilization Technology, Beijing 100124, China
Abstract：The EGSB (Expanded Granular Sludge Bed) reactor was started up completely autotrophic nitrogen removal over nitrite (CANON) process by changing the aeration mode and optimizing aeration/non-aeration conditions to ensure the stable running of the process. A study on different aeration/non-aeration conditions of change about nitrogen removal performance of CANON process. The functional bacteria activity in different sludge particle sizes under this system. The different particle sizes microbial influenced mechanism and the microflora community structure characteristics in CANON technology running process under the different operating conditions and system of EGSB reactor. The constant aeration rates reached 0.5L/min, the ratio of aeration/non-aeration was 2:1 (60min:30min) which were realized that the purpose of AerAOB (Aerobic Ammonia-Oxidizing Bacteria) and AnAOB (Anaerobic Ammonium-Oxidation Bacteria) synergistic denitrification and the activity of Nitrite-Oxidizing Bacteria was successful inhibition from 3.41 to 0.75mgN/(h·gVSS). The results of bisubstrate AnAOB (NH4+-N and NO2--N) inhibition kinetics fitting by Haldane showed that the half-saturation constants (ks) and the inhibition kinetics constants (kh) were 106.8 and 331.90mg/L, 272.4 and 66.61mg/L with correlation coefficients (R2) of 0.98133 and 0.99142, respectively. In the formation of CANON sludge granulation, the sludge particle size in the range of 0.154~0.335mm was based primarily on AerAOB, and the particle size greater than 1mm was based mainly on AnAOB. The synergy effect of microbial aggregates and steady community structure under the different particle sizes achieved the stable running of CANON technology.
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