Selective process for complete removal of dyes in textile direct dye bath effluent and textile dyeing wash liquors

摘要

The invention relates to a process of selective removal of a variety of recalcitrant synthetic dyes in simulated textile effluent, direct dye-bath, and hot wash-liquor effluent of textile dyeing industry using hydrophobic interaction chromatography (HIC) matrices. The present invention particularly relates the separation process by contacting of dyes in low or high salt solution with hydrophobic matrices. The hydrophobic adsorbent may contain linear alkyl groups (butyl- or octyl) or phenyl group. Dyes bound to the hydrophobic matrices are eluted with water or increasing quantities of an organic solvents or surfactant solution. The invention achieves the complete selective removal of organic dye molecules from textile dyeing effluents using HIC matrices with the reuse of the removed separated dyes along with the cleaning the environment. HIC matrix can be reused without regeneration step.