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| Mechanism and efficiency of the CANON system against rapid cooling enhanced by flocculent sludge ratios |
| LI Bo-lin1,2, ZHAO Wan-qing1,2, WANG Heng1,2, LI Ye1,2, WANG Yue1,2 |
1. School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China;
2. Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Wuhan 430070, China |
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Abstract This study explored the efficiency and mechanism of a single-stage autotrophic nitrogen removal system (CANON) with three different particle and flocculent sludge ratios (high particle system 10:1~30:1, equivalent system 1:1~1:1.5, high flocculent system 1:10~1:30) to resist rapid cooling. During cooling of the CANON system to 10℃ after stable operation at 30℃, the total nitrogen removal rate (NRR) of each system decreased significantly; however, the NRR of the same system was always higher than that of other systems. The activity of functional bacteria in each system was a positively correlated with temperature, and the declining range of aerobic ammonia-oxidizing bacteria (AAOB) activity was higher than that of the ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB), but the declining range of the AAOB activity in the same system was lower than that of other systems. Therefore, rapid cooling did not affect the spatial heterogeneity and activity distribution of granular and functional flocculent sludge bacteria. However, the spatial heterogeneity of the equivalent system demonstrated the highest significance, thus indicating that this system could better serve the roles of particles and floc sludge. Furthermore, its ability to resist rapid cooling was also better than that of the other systems.
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Received: 08 November 2020
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