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| Simulation and model calibration of denitrification biological filter |
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Abstract A pilot-scale DNBF was built and operated under two different conditions, filtration velocity was 8m/h, C/N of influent was 4 and 5 respectively by adding methanol as external carbon source to study its denitrification performance. The results of experiments show that the concentration of effluent TN decreased from 14.52mg/L to 7.14mg/L under the condition of influent C/N=5. BioWin software was used to simulate the pilot-scale DNBF, based on the operation data of filtration velocity of 8m/h and influent C/N of 5, normalized sensitivity coefficient measure (Si,j) and mean square sensitivity measure ( ) were used to conduct sensitivity analysis for the 412 parameters of BioWin software. The sensitivity analysis results indicated that the most sensitive parameters were the stoichiometric parameters related to methylotrophs and the parameters related to biofilm. According to the sensitivity analysis results, five most sensitive parameters were selected for model calibration by adjusting their values to obtain proper simulation of the operating condition of filtration velocity at 8m/h and influent C/N of 5. The operating condition of filtration velocity of 8m/h and influent C/N of 4 was simulated using the calibrated model for model validation after model calibration. The results of experiments and simulations showed that the presented model of pilot-scale DNBF and the model calibration protocol of this study could be used for the simulations of practical DNBFs.
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Received: 13 December 2013
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