Page History

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Introduction

The tube flocculator was is used to study how fluid shea r shear levels affect the settling properties of a flocculated alum-kaolin suspension. FReTA was is employed to quantitatively compare the effects of varying fluid shear and hydraulic residence time on the sedimentation velocity distributions and the post-sedimentation residual turbidities of flocculated suspensions formed in the tube flocculator. Results showed from experiments showed that shear induced floc break up occurred at all velocity gradients evaluated. There was is a correlation between high floc settling velocities and low residual turbidities, both of which were optimized at low fluid shear levels and long fluid residence times. This study showed shows that, for hydraulic flocculation systems, low turbidity water was is produced when fluid shear was is kept at a minimum.

Results and discussion

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