Abstract
As part of fundamental studies on the treatment of wastewater composed of organic suspended solids, the flotation technique was applied to the concentration of organic matter from diluted starch suspension. The flotation tests were performed using sodium dodecylsulfate (SDS) as an anionic collector and dodecylamine acetate (DAA) as a cationic collector. The results were discussed from the viewpoints of flotation recovery and starch concentration in sink after flotation. It was confirmed that recovery of the starch particles is impossible when using SDS as a collector. Furthermore, perfect recovery and removal of the starch particles is possible when using 250 ppm DAA as a cationic collector, in the pH range from 3 to 8. From the results obtained in this investigation, it is suggested that the removal of organic SS by froth flotation is feasible when using DAA as a cationic collector.
