Impact of dissolved oxygen on autotrophic nitrogen removals of the granular sludge in a CANON process
ZHANG Yao, HAN Hai-cheng, WANG Wei-gang, WANG Xiao-dong, WANG Ya-yi
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
Abstract：Impact of the different DO concentrations on the nitrogen removals was studied using the granular sludge in a completely autotrophic nitrogen removal over nitrite (CANON) process. The results showed that at DO concentration below 0.46mg/L, the CANON process could run at a continuous aeration mode, and the nitrogen removal rate of the CANON process increased from 0 to 50.88mg N/(L·h) with DO concentration increasing from 0 to 0.46mg/L; when the DO concentration was higher than 0.46mg/L, the CANON process could run at an intermittent aeration mode and nitrogen removal rate decreased from 50.88mg N/(L·h) to 41.84mg N/(L·h). So, the CANON process had a maximum nitrogen removal rate of 50.88mg N/(L·h) at DO concentration of 0.46mg/L, with a sludge nitrogen load of 0.45kg N/(kg MLSS·d). On the other hand, the activity of both ammonia oxidizing bacteria and anammox bacteria was influenced by the particle size and structure of the sludge. Due to the mass transfer resistance from liquid to the sludge particles, the DO half saturation coefficient of AOB was 0.77mg/L. As to anammox bacteria, its activity decreased slowly when DO concentration was less than 0.46mg/L, and decreased sharply as DO concentration increased from 0.46to 1.0mg/L; when DO concentration was higher than 1.0mg/L, the anammox activity was rarely observed.
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ZHANG Yao, HAN Hai-cheng, WANG Wei-gang, WANG Xiao-dong, WANG Ya-yi. Impact of dissolved oxygen on autotrophic nitrogen removals of the granular sludge in a CANON process. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(12): 4501-4510.
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