Date of Award
Bachelor of Science
Paper Science and Engineering
Adsorption of colored materials, dyestuff from simulated paper mill effluents by activated carbon columns appears to be a very effective method of removing color from waste effluents. Laboratory investigations have indicated that materials commonly encountered in paper mill effluents tend to slow the adsorption of color molecules. This phenomenon is overcome by allowing more time for adsorption. This lends itself to a diffusion-limited type adsorption mechanism with multi-layering adsorption on the carbon surface.
Using carbon of not less than 45 mesh, carbon adsorption columns appear to become feasible for large volume color removal. There appeared to be no significant head loss or plugging problems when counter-current flow columns were used to remove color from the mill effluents. The column also appeared to remove rosin from the waste while filtering out fiber fines. While contact time of the effluent with the carbon was shorter than usual (2 minutes as compared with 17 minutes commonly used today), color adsorption appeared very good.
A cost estimate of the carbon was also made. Since the adsorptive capacity of the carbon was not completely utilized, the estimates are high. The adsorption cost was $5,590 per million gallons of effluent treated for discard-type applications and $888 per million gallons of effluent treated for regenerated carbon.
Zomer, Duane L., "The Use of Activated Carbon for Removal of Dyestuffs from Secondary Paper Mill Effluent" (1972). Paper Engineering Senior Theses. 593.