Elemental sulfur-based autotrophic denitrification in stoichiometric S0/N ratio: Calibration and validation of a kinetic model. (July 2020)

• Record Type: Journal Article
• Authors: Huiliñir, C.; Acosta, L.; Yanez, D.; Montalvo, S.; Esposito, G.; Retamales, G.; Levicán, G.; Guerrero, L.
• Is Part Of: Bioresource technology. Volume 307(2020)
• Publication Date: 2020-07
• Subjects: Autotrophic denitrification -- Surface-based hydrolysis -- Modeling -- Batch system -- Simulation; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2020.123229
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Calibration and validation of an autotrophic denitrification model is proposed. The batch system used suspended biomass and S 0 /N at stoichiometric ratio. The acclimated inoculum contained mainly Thiobacillus . The most sensitive parameters in the model are related to S 0 hydrolysis. The calibrated model can simulate the S 0 -based autotrophic denitrification. Abstract: The inclusion of S 0 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 0 /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 S 0 /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 0 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.