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The combined effects of biomass and temperature on maximum specific ammonia oxidation rate in domestic wastewater treatment |
Yukun Zhang1,2, Shuying Wang1, Shengbo Gu1, Liang Zhang1, Yijun Dong1, Lei Jiang2, Wei Fan2, Yongzhen Peng1() |
1. National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China 2. School of Civil Engineering, Dalian Nationalities University, Dalian 116600, China |
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Abstract • Actual SAORs was determined using MLVSS and temperature. • Measured SAOR decreased with increasing MLVSS 1.1‒8.7 g/L. • Temperature coefficient (θ) decreased with increasing MLVSS. • Nitrification process was dynamically simulated based on laboratory-scale SBR tests. • A modified model was successfully validated in pilot-scale SBR systems. Measurement and predicted variations of ammonia oxidation rate (AOR) are critical for the optimization of biological nitrogen removal, however, it is difficult to predict accurate AOR based on current models. In this study, a modified model was developed to predict AOR based on laboratory-scale tests and verified through pilot-scale tests. In biological nitrogen removal reactors, the specific ammonia oxidation rate (SAOR) was affected by both mixed liquor volatile suspended solids (MLVSS) concentration and temperature. When MLVSS increased 1.6, 4.2, and 7.1-fold (1.3‒8.9 g/L, at 20°C), the measured SAOR decreased by 21%, 49%, and 56%, respectively. Thereby, the estimated SAOR was suggested to modify when MLVSS changed through a power equation fitting. In addition, temperature coefficient (θ) was modified based on MLVSS concentration. These results suggested that the prediction of variations ammonia oxidation rate in real wastewater treatment system could be more accurate when considering the effect of MLVSS variations on SAOR.
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Keywords
Specific ammonia oxidation rate
Sequencing batch reactor
Biomass
Temperature coefficient
Model simulation
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Corresponding Author(s):
Yongzhen Peng
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Issue Date: 17 March 2021
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