Decolorization of Reactive Yellow 17 in aqueous solution by ozonation

Abstract

In this study, factors affecting removal of color by ozonation of synthetic dye solutions containingwater-soluble reactive dye [Reactive Yellow 17 (RY17)] were investigated using chemical oxygen demand(COD) measurement method. The research was conducted using a semi-batch bubble column. As a result,the COD of the reactive dye wastewater was reduced by 78.58%, and decolorization was remarkable at pH12, complete degradation of the dye solution occurs in 12 min, ozone consumption goes on for a further30 min after which time most degradation reaction is completed. Kinetic study results have shown thatdirect ozonation of the dye solutions is a pseudo-first-order reaction with respect to dyes. The apparentrate constant increased both with applied ozone dosing and higher pH values, logarithmically decreasedwith the initial dye concentration.