Design of a Ventilation System for Odour Mitigation – Grit Removal Stage of a Wastewater Treatment Plant Using Computational Simulation

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   This study evaluates a push-pull ventilation system with localized extraction designed to reduce H2S concentrations in the settling stage of a wastewater treatment plant in Santiago, Chile.

   CFD simulations and field measurements show that the existing crossed ventilation system results in H2S concentrations up to 21 mg/m³ over the water surface. The improved push-pull system effectively lowers H2S levels in the plant corridors to below 7.5 ppm, complying with Chilean regulations.

I. Polanco1, M. Rodríquez1, A. Hammad2, A. Haddad3, V. Tam4  & D. Vasco1

1 Department of Mechanical Engineering, University of Santiago de Chile, Santiago, Chile. * ivan.polanco@usach.cl
2 Faculty of Built Environment, University of New South Wales, Sydney, Australia
3 Department of Civil Construction, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
4 School of Built Environment, Western Sydney University, Penrith, NSW, Australia

   Competing interests: The author has declared that no competing interests exist.

   Academic editor: Carlos N. Díaz.

   Content quality: This paper has been peer-reviewed by at least two reviewers. See the scientific committee here.

   Citation: I. Polanco, M. Rodríquez, A. Hammad, A. Haddad, V. Tam  & D. Vasco, 2025, Design of a Ventilation System for Odour Mitigation – Grit Removal Stage of a Wastewater Treatment Plant Using Computational Simulation, OLORES25 Congress, Santiago, Chile, www.olores.org.

   Copyright: 2025 Olores.org. Open Content Creative Commons licence. It is allowed to download, reuse, reprint, modify, distribute, and/or copy articles on Olores.org website, as long as the original authors and source are cited. No permission is required from the authors or the publishers.

   ISBN: pending.

   Keywords: Cleaner wastewater treatment; hydrogen sulfide; settling plant; CFD; ventilation system


Abstract

   The present study examines the development of a push-pull ventilation system with localized extraction located for use in wastewater treatment. The proposed approach aims to minimize the concentration of H2S in the settling stage of a wastewater treatment plant located in Santiago de Chile. Computational fluid dynamic simulations were implemented, and these were contrasted with actual measurements of H2S emission to assess and to improve the existing forced crossed ventilation system in place. The measurements at different posi-tions of the settling stage of the wastewater treatment process showed H2S concentrations as high as 21 mg/m3 at the center over the water surface when utilizing the existing crossed ventilation system. In general, the measured H2S concentrations agree with those predicted by computational simulations, with discrepancies between 8.1% and 28.4%. An assessment of the improved ventilation system with localized extraction systems (push-pull) was carried out to determine the level of effectiveness of decreasing the concentration of H2S in the settling plant. According to the obtained results, the concentration of H2S in the corridors of the plant does not surpass 7.5 ppm, which meets the required Chilean regulation.

 

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