Remoción de agente colorante monoazoico rojo 48:4 por procesos avanzados de oxidación en medios homogéneos y heterogéneos asistidos por fotocatálisis solar

Abstract

Water fulfills three essential functions in the industry: as a raw material, in cooling systems and as a means of evacuating much of the waste generated. This second function causes the characteristics of the water resource to be strongly altered after passing through these sectors, preventing in most cases, their reuse due to inadequate treatment. Within the range of industries that arise in Colombia, the textile sector is concerned about the multiple environmental impacts that it causes: contamination by the use of dyes is the main problem, since these agents are often very toxic and recalcitrant contaminants. In this research, three advanced techniques of oxidation assisted by solar photo catalysis for the degradation of the red pigment 48: 4, used in the staining of garments and fabrics were studied. The study was carried out, preparing a synthetic wastewater with characteristics similar to the wastewater generated in the dry cleaning processes, and the quality of the wastewater was evaluated under some of the applications contemplated in resolution 0631 of March 17, 2015 issued By the Ministry of Environment and Sustainable Development. Three Advanced Oxidation Processes (AOP’S) treated synthetic water. A heterogeneous process was applied: solar radiation / TiO2; and two homogeneous: solar radiation / H2O2 and solar radiation / H2O2 / Fe2 (also called photo- Fenton). The efficiency of the techniques was evaluated by pre and post treatment physicochemical characterization. A significant decrease in the values of the COD, COT, BOD5, STS and pH parameters showed percentages greater than 80% of dye destroyed or removed.