TRAITEMENT DE COLORANTS AZOIQUE ET ANTHRAQUINONIQUE PAR PROCEDES D'OXYDATION AVANCEE (POA)

Abstract

Dyes used and production generate a persistent, biorefractory, no biodegradable, toxic, carcinogenic and mutagenic effluents. Their treatment before release into the wild is necessary. Physical and biological conventional treatments ineffective due to high number of benzene cycles generated, high stability and resistance of new output molecule; they are non-destructive and transfer organic pollution from aqueous to another phase, causing a secondary pollution. It is in this context that the advanced oxidation processes (AOP) have emerged, they treat dyes solution because they generate highly reactive, no selective species as hydroxyl radicals (•OH). In this work, an azo dye (Orange G), an anthraquinonic dye (Alizarin Red S) and their mixture, were treated by plasma Glidarc, homogeneous photocatalysis (Fenton and photo-Fenton) and heterogeneous photocatalysis (TiO2- and ZnO). The results showed that there is no POA completely suitable for the degradation of all organic dyes types because of their different chemical structures. This study opens the way to other combined treatments as AOP-Physico-chemical or biological AOP-treatment which can be more effective and economical