Removal of MTBE in Columns filled with Modified Natural Zeolites

摘要

Methyl tert-butyl ether (MTBE) is an organic compound toxic and very soluble in water. When MTBE-contaminated water is available, it requires some method of decontamination. The Fenton method is used in environmental remediation and water treatment with low contaminant concentrations. In the search to extend the field of application of this methodology, they were begun to use catalysts in solid phase, particularly, metallic Fe nanoparticles (ZVI). In our laboratory we have prepared and characterized a supported catalyst (ZVI on a natural zeolite) that was studied for benzene degradation in experiences in batch and in fixed bed (continuous system) with interesting results. A similar set up was designed for the experiences described in this paper where aqueous solutions of MTBE with different concentrations were employed. The pH was regulated at 3.5 with a buffer. Bubble detachment was observed from the catalyst located in the bottom of the erlenmeyer demonstrating an important MTBE mineralization degree. Secondary products of degradation were detected and characterized. For experiences in batch, the MTBE removal was 45 % approximately in 24 hours. MTBE degradation in columns after the first hour is higher than the observed in the batch system although it raises a degradation degree in the order of 52% during the entire run.