Modeling of partial nitrification and denitrification in an SBR for leachate treatment without carbon addition |
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Authors: | V Y Hoang H Jupsin V C Le J-L Vasel |
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Institution: | (1) Unit? “Assainissement et Environnement”, Department of Sciences and Environmental Management, University of Liege, 185, Avenue de Longwy, 6700 Arlon, Belgium;(2) Institute of Chemistry, National Institute of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Vietnam; |
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Abstract: | A process of partial nitrification and denitrification in a sequencing batch reactor (SBR) treating leachate was simulated
by applying a modified version of activated sludge model no. 3 (ASM3), named ASM3_2step. This model modifies the ASM3 model
by separating nitrification and denitrification into two steps with nitrite as an intermediate substrate. Three periods, including
long term period, steady state and cycle evolution, were used for calibration. Three main processes were observed, including
biomass production, nitrification (focusing on nitrite accumulation) and denitrification. The kinetic and stoichiometric parameters
(
m\textA_NH \mu_{{{\text{A\_NH}}}} ,
Y\textA_NH Y_{{{\text{A\_NH}}}} ,
Y\textA_\textNO2 Y_{{{\text{A}}\_{\text{NO}}_{2} }} ,
Y\textH_\textO2 Y_{{{\text{H}}\_{\text{O}}_{2} }} , b
A,
K\textA_NH K_{{{\text{A\_NH}}}} ), were determined from biokinetic and respirometry tests. Some of the default values of kinetic and stoichiometric parameters
available in the ASM3 model and in the literature were kept constant, while some others were adjusted step by step until observed
state variables fit with experimental data. The maximum specific growth rate of nitrite oxidizing bacteria (0.108 day−1) (simulated by the model) and that of ammonium oxidizing bacteria (0.61 day−1) (from biokinetic tests) are the parameters which have the highest influence on the nitrite accumulation, even more than
oxygen supply intensity or Kla value. Other important parameters were
K\textAO_NH K_{{{\text{AO\_NH}}}} and
K\textAO_\textNO2 K_{{{\text{AO}}\_{\text{NO}}_{2} }} , calibrated at the values of 1.37 and 1.59 mg O2/L, respectively. The modified model and values of the kinetic and stoichiometric parameters obtained from the modeling process
will be used for optimization of the partial nitrification in the next study. |
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Keywords: | |
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