Investigation of Trapping, Sedimentation and Volumetric Fraction Efficiency of Vortex Settling Basin Using Taguchi Method

Document Type : Research Paper


1 M. Sc student of Hydraulic Structural Engineering, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran.

2 Department Water Engineering, College Agriculture, Ferdowsi University, Mashhad, Iran

3 Research Assistant (Department of Water Science and Engineering., Ferdowsi University of Mashhad, Mashhad, Iran)


Vortex Settling Basin is an efficient structure for separating sediments in irrigation canals and water and wastewater treatment plants. In this study, experiments in a laboratory basin model were performed to investigate the efficiency of trapping, sedimentation and volumetric fraction in the hydraulic laboratory of Water Science and Engineering Department of Ferdowsi University. The effect of inflow, central orifice diameter, Particle diameter, end sill height, and outlet end weir height on trapping and sedimentation efficiency of the Vortex Basin was investigated using Taguchi and Response Surface Methods. The results showed that in the range of proposed parameters in this study, the inlet flow is the most effective (%40) and the orifice diameter is the least effective (%0.4) parameter for trapping efficiency, and the particle diameter is the most effective (%43) and the outlet end weir height is the least effective (%6.90) parameter for sedimentation efficiency. An experiment with %75.48 trapping efficiency, %67.74 sedimentation efficiency and a small amount of sediment deposited on the floor was determined to be optimal due to a significant reduction in water loss (%8.46). The optimum situation was obtained for a basin with inflow of 22 L/s, orifice diameter of 0.07 m, end sill height of 0.05 m and weir height of 0.03 m. Finally, high- precision relationships were presented to calculate trapping, sedimentation and volumetric fraction.


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