Hydraulic Modeling of Mixing in Wastewater Dechlorination Basin
Publication: Journal of Environmental Engineering
Volume 116, Issue 3
Abstract
Flow and mixing in a wastewater dechlorination basin are investigated by tracing dye concentrations in a 1:12 scale sectional model and in a fullscale installation. The injection of an solution that neutralizes residual chlorine is simulated by dye. Time series measurements of dye concentrations are obtained in the model and in the full‐scale basin. Mean dye concentrations and standard deviations of concentration fluctuations measured throughout the model and the full‐scale basin compare favorably. Both show incomplete mixing of solution and residual chlorine. The model is then used to develop a substantially improved basin design by relocation of injection and addition of a columnar wall to redistribute the flow and create small‐scale turbulence. The modifications can be implemented without interruption of wastewater treatment. The performance of the improved design is again validated in the full‐scale operation. The study shows that existing problems of mixing and flow processes can be explored and corrected efficiently and effectively using a scale model. It is recommended that this method be used for the study of novel designs before construction.
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References
1.
Fischer, H. G., et al. (1979). Mixing in inland and coastal waters. Academic Press, New York, N.Y.
2.
Higuchi, H. (1986). “An experimental investigation of the flow field behind grid models.” Ninth Aerodynamic Decelerator and Balloon Tech. Conf., Amer. Inst. Aeronautics and Astronautics, New York, N.Y., Oct.
3.
Kuhlman, J. M. (1985). “Survey of nearfield Reynolds number effects and initial condition effects on buoyant and nonbuoyant jets.” Proc., Int. Symp. on Modeling Envir. Flows, American Society of Mechanical Engineers, New York, N.Y.
4.
McConnell, H. L. (1986). “Engineering report on the dechlorination facilities at MWTP, June‐October 1986.” Report, Metropolitan Waste Control Commission, Engrg. Constr. Dept., St. Paul Minn., Dec.
5.
Metropolitan Waste Control Commission (1987). “Operational and monitoring report on the dechlorination facilities—Metropolitan wastewater treatment plant.” QC‐87–128, Metropolitan Waste Control Commission, Quality Control Dept., Oct.
6.
Stefan, H. G., and Johnson, T. R. (1986). “Dechlorination basin hydraulics.” Project Report No. 250, St. Anthony Falls Hydr. Lab., Univ. of Minnesota, Minneapolis, Minn.
7.
Stefan, H. G., and Johnson, T. R. (1987). “Effluent sampling location and duration study for the Metropolitan Wastewater Treatment Plant, St. Paul, Minnesota.” Project Report No. 259, St. Anthony Falls Hydr. Lab., Univ. of Minnesota, Minneapolis, Minn.
Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 116 • Issue 3 • May 1990
Pages: 524 - 541
Copyright
Copyright © 1990 ASCE.
History
Published online: May 1, 1990
Published in print: May 1990
Authors
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