Modeling of Sewage Plant Gas Emission and HVAC using CFD

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sesion04 tarela07   In this sewage plant under consideration, the wastewater is moved vertically using eight Archimedes screw pumps. During the process of moving the wastewater upward, there is an emission of H2S from the surfaces of the Archimedes pumps. Traces of H2S have been detected inside of the building that houses the pump engines.

   The present paper evaluates a modification in the HVAC system of the building to mitigate the presence of H2S inside the building.

P. A. Tarela1 and F. E. Camelli2

1. CCyA Ingeniería, Buenos Aires, Argentina.
2. Laboratory for Computational Fluid Dynamics, Department of Physics and Astronomy, George Mason University, Fairfax, Virginia, USA.


   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 scientific committee here

   Citation: P. A. Tarela and F. E. Camelli, 2015, Modeling of Sewage Plant Gas Emission and HVAC using CFD, III International Conference of Odours in the Environment, Bilbao, Spain, www.olores.org.

   Copyright: 2015 olores.org. Open Content Creative Commons license. It is allowed to download, reuse, reprint, modify, distribute, and/or copy articles in olores.org website, as long as the original authors and source are cited. No permission is required from the authors or the publishers.

   ISBN: 978-84-608-2262-2.

   Keyword: indoor odors, CFD, gas plume, HVAC, numerical simulation, H2S.

Abstract

  In this sewage plant under consideration, the wastewater is moved vertically using eight Archimedes screw pumps. During the process of moving the wastewater upward, there is an emission of H2S from the surfaces of the Archimedes pumps. Traces of H2S have been detected inside of the building that houses the pump engines. The present paper evaluates a modification in the HVAC system of the building to mitigate the presence of H2S inside the building. In order to identify the strength of the source, measurements of concentration levels were performed using an ion mobility spectrometer. The measurements were in the range of ppm. The proposed solution is based on positive pressure inside the building. The fresh air needed to increase the pressure will be taken from outside using a chimney. A Computational Fluid Dynamics (CFD) model was used to optimize the design of the chimney (e.g. height). This paper demonstrates the flow and dispersion patterns from the CFD model.

 

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