Traitement des liquides toxiques en écoulement film par GLIDARC

Abstract

The anthraquinone dye Acid Green 25 (AG25) was treated by a non-thermal plasma generated by a new GlidArc, designed for the treatment of liquid films falling. The gaseous species formed in the landfill, especially the radicals’ ●OH, induce sufficiently strong oxidizing effects to degrade refractory molecules. The new design has been exclusively used to treat liquid films in continuous flow. Optimization experiments could determine the key parameters for more efficient operation of the new device. In the latter, the glass cell was removed and replaced by a stainless steel plate, instead of the recirculating liquid to be treated along a groove for conveying the aqueous film. Removal of the glass cell has to overcome the refrigeration from the process stream, which allows to decrease the cost of the process in question. All these features combined, encourage extrapolate the process in question to a larger scale (pilot and / or industrial). Among other things, this process lends itself easily to coupling with water decontamination techniques. In this work, the AG25 dye was treated by different process, plasmachime, plasmacatalyse heterogeneous (TiO2 suspended and supported), and plasmacatalyse homogeneous (Fenton). The results showed that the maximum decolorization and degradation were achieved for the heterogeneous supported plasmacatalyse treatment. The dye film discoloration (80 μM) reached 98% after 60 min and the TOC fell by 73% in the same processing time. By cons, in the absence of the supported catalyst, discoloration was 95% after 3 h of treatment, while reducing TOC reached 63% for the same period. The new device for liquid films of you treatment is promising and may be subject to an application on a larger scale.