engleski

INFLUENCE OF CHEMICAL STRUCTURE OF DYES ON DISCOLOURATION EFFECTS

From the ecological and physiological point of view the effluents from textile industries are the most serious pollutants. For achieving water of high quality for recycling use the most important thing in discolouration of effluent is the removal of dyes. In practice it was shown that the application of only one method is not sufficient for total discolouration of textile dye effluent. On the basis of the fact that discolouration of textile dye effluent with azo dyes gives the best results, most methods are based on the removal of these dyes. The aim of this paper is to achieve the total discolouration of different chromogen water systems. For this purpose the effluent with the following two reactive and two acid dyes are chosen: C.I. Acid Blue (azo), C.I. Reactive Blue 19 (antraquinone), C.I. Acid Red 52 (xanthen) and C.I. Reactive Blue 116 (phtalocianine). The discolouration of dyed water was carried out by the following methods: using Fentons reagent(with and without using ultrasound) and coagulation/flocculation method. The degree of discolouration was determined spectrophotometrically. Additionally, the following ecological parameters of water were determined: chemical oxygen demand (COD), biological oxygen demand (BOD) and total organic carbon (TOC). It was concluded that total water discolouration is achieved only in the case of water coloured with azo dye.

ecology; waste water; recycling; decolourisation

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