Colour Removal and Chemical Treatment Systems
topic
Textile effluent colour removal uses coagulation-flocculation with polyaluminium chloride or iron sulphate at pH 5 to 7, ozonation at 5 to 15 milligrams per litre ozone dose, advanced oxidation with combined ozone and UV or hydrogen peroxide and UV that generates hydroxyl radicals degrading chromophore structures, or activated carbon adsorption to remove dye colour that biological treatment alone cannot adequately reduce to levels meeting discharge colour standards.
Role
Removes the reactive, disperse, and vat dye colour from textile effluents that is the most visible environmental impact of dyeing operations and the primary focus of regulatory discharge limits for colour, with colour removal efficiency being the critical performance parameter for textile effluent treatment systems in regions with colour discharge standards that require decolourisation before discharge to sensitive receiving waters.
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