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The Effects of Temperature on Turbulent Flocculation: Fluid Dynamics and Chemistry
Author(s) -
Hanson Adrian T.,
Cleasby John L.
Publication year - 1990
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.1551-8833.1990.tb07053.x
Subject(s) - impeller , flocculation , turbulence , intensity (physics) , breakup , stator , mixing (physics) , mechanics , turbulence kinetic energy , coagulation , chemistry , materials science , mechanical engineering , thermodynamics , chemical engineering , physics , engineering , optics , psychology , quantum mechanics , psychiatry
One of the primary objectives of the research described here was to identify the best available measure of the intensity of turbulence with a view to correcting the mixing intensity of the flocculation process to compensate for temperature effects. It was concluded, however, that no one measure of turbulence intensity is better than another. The authors observed that flocculation efficiency at 20°C is not sensitive to impeller geometry, but at 5°C impeller geometry is much more important. A turbine impeller caused much more floe breakup than a stake and stator impeller. With metal coagulants, the use of constant pOH is appropriate for correcting system chemistry for temperature effects. Alum floc was significantly weaker than iron floc under all conditions tested.