Elemental sulfur-based autotrophic denitrification in stoichiometric S0/N ratio: Calibration and validation of a kinetic model

C. Huiliñir*, L. Acosta, D. Yanez, S. Montalvo, G. Esposito, G. Retamales, G. Levicán, L. Guerrero

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The inclusion of S0 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 S0/NO3 ratio was used. The model was calibrated with batch data (initial nitrate concentrations of 50 and 6.25 mg NO3-N/L) at an S0/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 S0 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.

Original languageEnglish
Article number123229
JournalBioresource Technology
Volume307
DOIs
StatePublished - Jul 2020
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2020 Elsevier Ltd

Keywords

  • Autotrophic denitrification
  • Batch system
  • Modeling
  • Simulation
  • Surface-based hydrolysis

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