|
NCSU Institutional Repository >
NC State Theses and Dissertations >
Theses >
Please use this identifier to cite or link to this item:
http://www.lib.ncsu.edu/resolver/1840.16/6
|
| Title: | Characterizing the Spatial Variation in Particle Aggregation due to Heterogeneous Turbulence in a Flocculation Reactor |
| Authors: | Hopkins, Daniel Cory |
| Advisors: | Dr. Joel J. Ducoste, Committee Chair |
| Keywords: | water treatment
mixing
heterogeneous turbulence
flocculation |
| Issue Date: | 17-Jun-2002 |
| Degree: | MS |
| Discipline: | Civil Engineering |
| 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. |
| URI: | http://www.lib.ncsu.edu/resolver/1840.16/6 |
| Appears in Collections: | Theses
|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
|
