Detoxifi cación por fotocatálisis solar de efl uentes cianurados provenientes de una industria metalúrgica

Autores UPV
Revista Dyna


Wastewaters from metal fi nishing industry contain, among other pollutants, high amounts of cyanide and heavy metals, which results in a high toxicity of the effl uent. Therefore, it is necessary to detoxify the effl uent before discharging to a sewage treatment plant which commonly consists in a biological treatment. In this study, we analyzed different photocatalytic methods for cyanide removal: photo-Fenton, Fenton-like with metals such as manganese, zinc, silver, cobalt, chromium and copper and photocatalysis with addition of other oxidants such as persulfate. Initially, we performed a study on synthetic water prepared with contaminants found in real wastewater. In order to better simulate real conditions, the possible interferences from ions usually present in water, such as carbonates, sulfates, fl uorides or nitrates has been studied. The best treatment (Fenton-Like) was applied to real wastewaters from a metallurgical industry of the east of Spain, containg high amounts of copper. The global analysis of the treatments determined that the best results were obtained by applying solar photo-Fenton process and photo-Fenton-like processes with copper. The total degradation of cyanide and copper precipitation was achieved, improving the characteristics of the treated effl uent.