Kinetic analysis on the two-step processes of AOB and NOB in aerobic nitrifying granules |
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Authors: | Fang Fang Bing-Jie Ni Xiao-Yan Li Guo-Ping Sheng Han-Qing Yu |
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Institution: | (1) Department of Chemistry, University of Science & Technology of China, Hefei, 230026, China;(2) Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China |
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Abstract: | Complete granulation of nitrifying sludge was achieved in a sequencing batch reactor. For the granular sludge, batch experiments
were conducted to characterize the kinetic features of ammonia oxidizers (AOB) and nitrite oxidizers (NOB) in the granules
using the respirometric method. A two-step nitrification model was established to determine the kinetic parameters of both
AOB and NOB. In addition to nitrification reactions, the new model also took into account biomass maintenance and mass transfer
through the granules. The yield coefficient, maximum specific growth rate, and affinity constant for ammonium for AOB were
0.21 g chemical oxygen demand (COD) g−1 N, 0.09 h−1, and 9.1 mg N L−1, respectively, whereas the corresponding values for NOB were 0.05 g COD g−1 N, 0.11 h−1, and 4.85 mg N L−1, respectively. The model developed in this study performed well in simulating the oxygen uptake rate and nitrogen conversion
kinetics and in predicting the oxygen consumption of the AOB and NOB in aerobic granules. |
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Keywords: | Aerobic granule Ammonia oxidizers (AOB) Biological wastewater treatment Nitrification Nitrite oxidizers (NOB) Kinetics |
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