Date of Defense

Spring 3-1979


A review of the current literature concerning retention is presented. The current models for flocculation are discussed. Methods for the measurement of retention are outlined and the procedure employed is detailed. The goal of this work was to study the effective o molecular weight and charge density of cationic starch on its effectiveness as a retention aid. Two molecular weight starches were reacted to give three charge densities. Each cationic starch was studied at three addition levels, each at three shear levels. The results of the retention tests are discussed in terms of starch loading, nitrogen loading, molecular weight, and shear resistance. The results indicate that higher molecular weight gives better retention and shear stability. By increasing charge loading, the effect of molecular weight can be overcome. The results also indicate that there is an optimum charge loading for high retention and shear stability.

Access Setting

Honors Thesis-Campus Only