Thesis Details

Thesis Title: A study of the feasibility of using fly ash for the removal of dyestuff from segregated textile dye wastewater
Thesis Author: Jon Davidson, Jr.
Abstract: This research was undertaken to determine the feasibility of removing certain dyestuffs from simulated wastewater solutions with fly ash solutions. The parameters explored were dye class, fly ash concentration, alum concentration, pH, temperature, and dye molecular constitution and size. Five classes of dye were studiedl basic, direct, solubilized vat, acid, and solubilized sulfur. It was found that basic dyestuffs were more effectively removed by fly ash alone than with fly ash and alum. Fly ash and alum systems proved to be more effective than fly ash alone for the removal of direct dyestuffs. The solubilized vat dyestuffs and the acid dyestuffs were not sufficiently removed by either fly ash alone or fly ash and alum to be considered feasible. Removal of the solubilized sulfur dyestuff was more effectively accomplished when the fly ash and alum systems were employed. Where alum was used the concentration proved to be very critical with optimum results being obtained at 200 parts per million. As the fly ash concentration was increased so did total color removal, regardless of system employed. Temperature had little or no effect on the color removal properties of either system, and pH influenced only the systems employing alum. The molecular size of the dyestuffS had little or no effect on the amount of color removed. The functional group or groups of the dye molecule seemed to affect the ab1lity of both systems in the removal of the dyestuff from the segregated wastewater solutions studied. In conclusion, fly ash alone, or in some instances fly ash and alum, has been shown to be feas1ble for the treatment of certain segregated dyestuff wastewater. However. each dyestuff needs to be stud1ed individually to determine the feas1b1lity of us1ng fly ash for color removal.