A. Uygur, Reuse of decolourised wastewater of azo dyes containing dichlorotriazinyl reactive groups using an advanced oxidation method, COLOR TECHN, 117(2), 2001, pp. 111-113
The possibility of reusing textile wastewater in dyeing processes is invest
igated in this study. Wastewater was first decolourised by an advanced oxid
ation method and was then reused in the dyeing of cotton fabric. It was fou
nd that decomposition products of the azo dyes used in this study released
hydrogen peroxide and sodium sulphate, which were found to be present in th
e initial wastewater following decolourisation. Removal of this hydrogen pe
roxide from the wastewater prior to subsequent dyeings produced a dyeing co
lour strength of 98.4% as compared to that of the standard dyeing. A second
reuse of this wastewater resulted in a slightly lower colour strength of 9
4.4% as compared to standard dyeing.