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Abstract:
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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.
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