Elemental sulfur-based autotrophic denitrification in stoichiometric S 0 /N ratio: Calibration and validation of a kinetic model

The inclusion of S hydrolysis in a kinetic model of autotrophic denitrification has been recently proposed; however the model has not been calibrated or validated yet. Thus, a new methodology was developed and applied to calibrate and validate this kinetic model for the first time. An inoculum adapt...

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Bibliographic Details
Published inBioresource technology Vol. 307; p. 123229
Main Authors Huiliñir, C, Acosta, L, Yanez, D, Montalvo, S, Esposito, G, Retamales, G, Levicán, G, Guerrero, L
Format Journal Article
LanguageEnglish
Published England 01.07.2020
Subjects
Autotrophic Processes
Bioreactors
Calibration
Denitrification
Nitrates
Sulfur
Autotrophic denitrification
Simulation
Batch system
Modeling
Surface-based hydrolysis
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Summary:The inclusion of S hydrolysis in a kinetic model of autotrophic denitrification has been recently proposed; however the model has not been calibrated or validated yet. Thus, a new methodology was developed and applied to calibrate and validate this kinetic model for the first time. An inoculum adapted from a poultry wastewater treatment plant at stoichiometric S /NO ratio was used. The model was calibrated with batch data (initial nitrate concentrations of 50 and 6.25 mg NO -N/L) at an S /N ratio = 2.29 mg S/mg N and validated with seven different batch data. The sensitivity analysis showed that the most sensitive parameters are related to S hydrolysis. The kinetic model was successfully calibrated with the new methodology and validated, with Theil inequality coefficient values lower than 0.21. Thus, the proposed model and methodology were proved to be well suited for the simulation of elemental sulfur-based autotrophic denitrification in batch systems.
ISSN:1873-2976
DOI:10.1016/j.biortech.2020.123229