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The development of CFD models for simulating settling tanks started about 30 years ago. In the meantime, our knowledge of the physical processes in clarifiers has advanced and the speed and memory of computers has increased by orders of magnitude. It is now possible to use models as tools for the assessment, design and upgrading of primary and secondary clarifiers. This paper describes the features of a public domain model that was funded by the U.S. EPA. The model is two dimensional but it includes the 'swirl' component. The current version of the model is designed for circular settling tanks. The flow and transport formulations are based on the conservative Finite Control Volume approach. The salient features of the model are: discrete, zone and compression settling, flocculation, density currents, non-Newtonian flow, scraper or suction removal mechanics, temperature and atmospheric exchange. Most commonly employed internal tank options are included.

Document Type: Research Article


Publication date: 2005-01-01

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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