Hydrodynamic Modeling of a Surface Water Treatment Pilot Plant

A mathematical model for the hydrodynamics of a surface water treatment pilot plant was developed and validated by the determination of the residence time distribution (RTD) for the main equipments of the unit. The well known models of ideal/real mixing, ideal displacement (plug flow) and (one-dimensional axial) dispersion model were combined in order to identify the structure that gives the best fitting of the experimental data for each equipment of the pilot plant. RTD experimental results have shown that pilot plant hydrodynamics can be quite well approximated by a combination of simple mathematical models, structure which is suitable for engineering applications. Validated hydrodynamic models will be further used in the evaluation and selection of the most suitable coagulation-flocculation reagents, optimum operating conditions (injection point, reaction times, etc.), in order to improve the quality of the drinking water.

Authors:

• C.-M. Militaru
• A. Pǎcalǎ
• I. Vlaicu
• K. Bodor
• G.-A. Dumitrel
• T. Todinca

Keywords:

• drinking water
• hydrodynamic modeling
• pilot plant
• residence time distribution
• surface water.

References:

[1] L. C. Rietveld, Improving operation of drinking water treatment
through modeling, Delft University of Technology, Dissertation, 2005.
[2] T. Pröll, T. Todinca, M. ┼×uta, A. Friedl, "Acid gas absorption in trickle
flow columns-Modeling of the residence time distribution of a pilot
plant--, Chem. Eng. and Prog., vol. 46, pp. 262-270, 2007.
[3] K. Bodor, Contributions to the improvement of drinking water quality
indicators by means of new reagents and new technologies, Timisoara,
Romania, PhD thesis (Romanian), 2005.
[4] E. B. Nauman, Chemical reactor design, optimization and scaleup,
New-York:McGRAW-HILL, 2002, pp.539-577.
[5] G. I. M. Worm, G. A. M. Mesman, K. M. van Schagen, K. J. Borger, L.
C. Rietveld, ÔÇÿ-Hydraulic modeling of drinking water treatment plant
operations--, Drink. Water Eng. Sci., vol. 2, pp.15-20, 2009.
[6] T. Todinca, M. Geantâ, Modeling and simulation of chemical processes.
Applications in MATLAB, Timişoara: Politehnica House, 1999, ch. 2.
[7] P. R. Lopez, A. G. Lavin, M. M. Lopez, J. Bueno de las Heras, "Flow
models for rectangular sedimentation tanks", Chem. Eng. and Prog.,
vol. 47, pp. 1705-1716, 2008.