REMOVAL OF ACID DYE PROCION SAPPHIRE H-EXL FROM MODEL DYEING BATH, COMPARISON OF TRADITIONAL AND INNOVATIVE TREATMENT METHODS

Abstract

One of the important technical and economic challenges in textile industry is the efficient use of water. The increasing cost of water, energy and wastewater treatment dictate needs for water recycle in the textile industry on a large scale. Concentrated waste water streams contaminated with hardly- or non-biodegradable compounds should be treated at the contamination source. The alternative possibility of effective removal of acid dyes from spent dyeing liquor is based on ion exchange reaction caused by addition of ionic liquids (quaternary ammonium salts, R4N+Cl-) into the spent liquor. Ion liquids serve as a liquid anion exchanger. The interaction of these dyes with suitable quaternary ammonium salts produces slightly soluble ionic salts which can settle after a long contact time or can be removed more efficiently by the action of common inorganic flocculants. This purified water from the dying baths can be subsequently reused. So, the recycling of water can save water sources, water treatment costs, some chemicals and energy.