INFLUENŢA AGENŢILOR AUXILIARI ASUPRA PROCESELOR DE EPURARE A APELOR REZIDUALE TEXTILE DE COLORANTUL AAD71

Abstract

Experimental studies were conducted to reduce the concentration of model systems, which contain direct dye AAD71, dispersing agent NaLS and Ethyleneglycol EGI, subjected to filtration through non-destructive methods as follows: coagulation, electroflotation, electro photocoagulation and absorption on activated carbon; and destructive methods as oxidation/photooxidation with Fenton's reagent and photo-oxidation with titanium oxide. The main proposed objective was reducing the concentration of pollutants from the model systems with dye concentration 200 mg/l,dispersant concentration 60 mg/l, and ethylene glycol dispersant 60 mg/l respectively, to admissible norms for discharge into water basins. According to the research results, it was found that the most efficient method for simple and complex model systems, is coagulation [Al 2 (SO4) 3] = 0.1M followed by adsorption on activated carbon, behind which were obtained values of COD -CR about 95% and the effect of fading can reach up to 100%.