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Discussion papers
https://doi.org/10.5194/dwes-2019-6
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/dwes-2019-6
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 17 Apr 2019

Research article | 17 Apr 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Drinking Water Engineering and Science (DWES).

Numerical Analysis of Circular Settling Tank

Elahe Chero1, Anahita ghafoorisadatieh2, Hamidreza Zahabi3, Mohammadamin Torabi4, and Keivan Bina5 Elahe Chero et al.
  • 1Department of civil Engineering, KhavaranInstitute of Higher Education, Mashhad, Iran
  • 2Department of civil Engineering, Institute of higher education khazar Mahmudabad, Iran
  • 3Department of Civil Engineering, Institute Superior Tecnico, 1049-001 Lisbon, Portugal
  • 4Department of Civil and Environmental Engineering, Idaho State University, Pocatello, ID, USA
  • 5Disaster Risk Reduction Advisor, Assistant Professor of Civil Engineering, Khavaran Institute of Higher Education, Ghasem Abad, Mashhad, Iran

Abstract. Nowadays, settling tank's removal efficiency is one of the most crucial matter in all Water or Wastewater Treatment Plants (WTPs or WWTPs). The unit can affect a WWTP performance and improve effluent quality provided. In this paper, geometrical aspects of a settling tank were numerically analyzed via tracer curves, finite volume method and Ansys-cfx software in which, baffle depth and diameter of a settling tank were assessed. Firstly, a previous study was similarly remodeled to verify the simulation results. The impact of tank depth variation has been numerically assessed where the outcomes showed that deeper tank could raise discharge time or Hydraulic Retention Time (HRT). Thus, extensive discharge time may result in less polluted effluent degrading more solids. However, the tank should not be considered too deep regarding economic issues. Moreover, the differential effect of baffle height was analyzed and indicated that lower height is more useful to boost HRT. Investigation of tank diameter changes also revealed that wider diameters bring broader HRT.

Elahe Chero et al.
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