Hydrodynamic characteristics of a proposed sewer overflow screening device

Md. Abdul Aziz, Monzur Imteaz, Nazmul Huda, Jamal Naser, Donald Phillips

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

Abstract

Some of the major concerns regarding the sewer overflow include serious
environmental, aesthetic and public health problems in receiving water odies. Due to increasing public complains, scientist and engineers are focusing on retention of the entrained sewer solids within the sewer overflow device. Present study investigates the hydrodynamic characteristics of a self cleansing sewer overflow device having a rectangular tank and a slotted ogee weir to capture the gross pollutants. Neither external power source nor mechanical or electrical components are required for the operation of this self-cleansing device. The proposed device is deviated from traditional weir structure in regards to inflow pattern, size and shape. For a traditional weir flow along a creek, the incoming flow is stable without any significant reflection. Whereas, for the proposed weir like device, significant reflections of inflow will occur due to smaller dimension of the device, which needs to be accommodated within existing urban sewerage system. Computational Fluid Dynamics (CFD) technique was used to simulate the flow phenomena. CFD simulated results were compared with analytical results. Results show curved face of the ogee spillway remains in contact with the weir at all low flows. Near the right side of the device, where inflow is being reflected by the side wall, velocity and water level were found much more compared to normal flowing water on the sloping plane. Flow non-uniformity across the weir will hamper effectiveness of self-cleansing, as shear force from uniformly distributed (across the width) flow will effectively remove the trapped pollutants from the screen. Onedimensional analytical solution is unable to produce these flow undulations, which can be easily visualized by 3D CFD simulations.
Original languageEnglish
Title of host publicationProceedings of the 5th Civil Engineering Conference in the Asian Region and Australasian Structural Engineering Conference , held in Sydney, Australia, 8-12 August 2010
Place of PublicationSydney
PublisherEngineers Australia
Pages1-6
Number of pages6
ISBN (Print)9780646537276
Publication statusPublished - 2010
Externally publishedYes
EventCivil Engineering Conference in the Asian Region and Australasian Structural Engineering Conference (5th : 2010) - Sydney
Duration: 8 Aug 201012 Aug 2010

Conference

ConferenceCivil Engineering Conference in the Asian Region and Australasian Structural Engineering Conference (5th : 2010)
CitySydney
Period8/08/1012/08/10

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