Date of Award


Degree Name

Bachelor of Science


Paper Science and Engineering


This study was performed to determine if the flotation deinking process is first order with respect to ink particle concentration and to examine the effects that pH may have on the kinetics of ink removal flotation. A Hallimond tube laboratory flotation device was used to examine the process. Image analysis of ink particles was used to obtain quantitative results regarding flotation efficiency.

The examination verified that the flotation process follows the first order rate equation with some degree of experimental error. A trend in the effect of pH on deinking rate was also found. It was determined that the rate constant, k, increased with decreasing pH. An increase in k corresponded to improved flotation rate.

The results follow the theory that decreasing the repulsive forces between negatively charged ink particles and bubbles improves deinking efficiency.