Full Description

The Safe Drinking Water Act (SDWA) Amendments of 1986 and the proposedDisinfectants/Disinfection Byproducts Rule (D/DBPR) impose somewhat conflictingdisinfection regulations whereby the finished water level of disinfection must beincreased while the disinfectant and disinfection byproduct residuals must belowered. The aim of this research project was to evaluate a method for maximizingthe hydraulic efficiency of contactors in order to reduce required disinfectantconcentrations and subsequently, the disinfection byproductformation can be controlled and/or minimized. Effective design of new basins andretrofitting of existing basins play an important role in disinfection regulationcompliance. The hydraulic performance of a contactor can be influenced byinternal baffling and inlet and outlet location. To understand the effects of thebasin configuration on hydraulics and disinfection, empirical data obtained fromtracer tests performed on full scale or pilot scale basins are usually analyzed.An attractive alternative to these expensive experimental tracer testing methods,is the use of computational fluid dynamics (CFD) modeling to simulate tracerstudies. In addition to determining concentration profiles as obtained fromtracer tests, CFD modeling offers insight on the internal flow patterns includingvelocity, energy, and pressure. The goals of this research project were toevaluate the ability of simulated tracer tests to reproduce data from tracerexperiments, and to analyze the influence of baffling arrangements and inlet andoutlet positions on the performance of the contactor. Various configurations ofdisinfection contactors were modeled using a commercially available finiteelement CFD software package called FIDAP(R). The hydraulics and concentrationdistribution were used to determine optimal basin designs. Tracer studies weresimulated using the CFD software and ultimately compared to empirical data tovalidate this approach. Includes 22 references, tables, figures.

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Edition: Vol. - No. Published: 01/01/1999 Number of Pages: 28File Size: 1 file , 1000 KB