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Modeling Hydrodynamics and Ozone Residual Distribution in a Pilot‐Scale Ozone Bubble‐Diffuser Contactor
Author(s) -
Mariñas Benito J.,
Liang Sun,
Aieta E. Marco
Publication year - 1993
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/j.1551-8833.1993.tb05960.x
Subject(s) - contactor , ozone , tracer , dispersion (optics) , diffuser (optics) , residence time distribution , plug flow , mixing (physics) , bubble , chemistry , residual , volumetric flow rate , flow (mathematics) , mechanics , environmental science , thermodynamics , physics , mathematics , light source , power (physics) , organic chemistry , algorithm , quantum mechanics , nuclear physics , optics
Mixing conditions inside a pilot‐scale ozone bubble‐diffuser contactor and the effect of mixing on ozone residual concentrations were investigated. The 17‐ft‐high, 6‐in.‐diameter contactor was operated with both counter‐current and cocurrent water and gas flows. When the contactor was operated in the cocurrent mode, it was packed with 1‐in. plastic saddles. Tracer and ozonation tests showed that mixing conditions in the contactor ranged from nearly plug‐flow to well mixed. Dispersion increased as the gas flow rate increased and as the water flow rate decreased, with the latter dependency being stronger. The lowest dispersions were observed for tests run with the cocurrent packed contactor. A computer model was developed and used to predict dispersion numbers, ozone concentration profiles, ozone residuals, and C × T parameters. Disagreements between observed and predicted tracer curves might have been caused by short‐circuiting, but in general the model predicted ozone residuals well.