Conference article

Modeling N/S ratio and temperature effects in simultaneous biological denitrification and sulfide oxidation

Michal Sposob
Department of Process, Energy and Environmental Technology, University College of Southeast Norway, Norway

Rune Bakke
Department of Process, Energy and Environmental Technology, University College of Southeast Norway, Norway

Carlos Dinamarca
Department of Process, Energy and Environmental Technology, University College of Southeast Norway, Norway

Download articlehttp://dx.doi.org/10.3384/ecp1713841

Published in: Proceedings of the 58th Conference on Simulation and Modelling (SIMS 58) Reykjavik, Iceland, September 25th – 27th, 2017

Linköping Electronic Conference Proceedings 138:5, p. 41-47

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Published: 2017-09-27

ISBN: 978-91-7685-417-4

ISSN: 1650-3686 (print), 1650-3740 (online)

Abstract

A model describing the simultaneous removal of NO3- and HS- by microorganisms is presented here. The oxidation of HS- (electron donor) can be controlled by the appropriate dosage of NO3-. The developed model, which includes variable process stoichiometry, attempts to predict the distribution of sulfur oxidation products. Stoichiometric coefficients are based on a 150 days experimental study of temperature (25-10 ?C) and N/S ratio (0.35-1.30) effects. The model can be used as a prediction tool for autotrophic denitrification with HS-. Elemental sulfur production is included in the mathematical model, however, its accumulation and release (as SO42-) with increasing feed N/S ratio (e.g. leading to higher effluent than feed total sulfur mass at N/S = 1.30) is not simulated. A conceptual model to account for biological accumulation and release of elemental sulfur is proposed here.

Keywords

autotrophic denitrification, elemental sulfur production, mathematical modeling, sulfate production

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