Characterizing the Spatial Variation in Particle Aggregation due to Heterogeneous Turbulence in a Flocculation Reactor

Show full item record

Title: Characterizing the Spatial Variation in Particle Aggregation due to Heterogeneous Turbulence in a Flocculation Reactor
Author: Hopkins, Daniel Cory
Advisors: Dr. Joel J. Ducoste, Committee Chair
Abstract: A study was performed to investigate the impact of turbulent heterogeneity on aggregation and breakup in a flocculation reactor. The influence of the average characteristic velocity gradient (G), particle concentration, and coagulation mechanism on the flocculation performance was also investigated. Experiments were performed in a bench-scale reactor with a low-shear axial-flow impeller using a photometric dispersion analyzer (PDA) to examine the state of aggregation. Results indicated that floc growth increased while the floc size and variance in the floc size distribution decreased as G increased. In addition, floc growth, size, and floc size variance increased when the particle concentration of the water was increased and when moving from a charge neutralization mechanism to a sweep floc mechanism. Lastly, floc growth, size, and variance were found to vary spatially at low G values in the reactor with floc size and growth larger in the bulk region and the variance larger in the impeller discharge region.
Date: 2002-06-17
Degree: MS
Discipline: Civil Engineering
URI: http://www.lib.ncsu.edu/resolver/1840.16/6


Files in this item

Files Size Format View
etd.pdf 225.8Kb PDF View/Open

This item appears in the following Collection(s)

Show full item record