MTBE كارآيي فن آوري اكسيداسيون پيشرفته ازن و هيدروكسيل در تجزيه متيل - ترشياري - بوتيل اتر

Efficiency of advanced oxidation and hydroxyl technology in methyl terciary - butyl ether(MTBE)

Background and aim: Advanced oxidation processes have been demonstrated as the rapid and effective methods for the treatment of a vast range of the refractory pollutants. The aim of this study was to use ozone in reaction with hydroxyl radicals (high-PH) as the reaction accelerator for MTBE degradation in industrial wastewater and polluted water. Methods: The effect of 03 with the hydroxyl radicals (high-PH) was experimented for MTBE degradation in an aqueous phase. All the reactions were performed in a semi-continuous bubbling column reactor. The effects of PH, reaction time and rate of 03 needed to attain complete MTBE degradation were examined. MTBE ozonation in five different PI-1s (10,10.5,11,11.5 and 12) during 100 minutes for each PH was performed. Results: The study showed that the PH=11.5 is the fittest PH for MTBE degradation by the radical reactions. In this pH [intermediates] /[MTBE] ratio was 0.6v 1 mM that it is 20% more than its nearest ratio (related to PH=11). The least time (70 minutes) and needed ozone (5.3 moles) for 90% degradation of each mole of MTBE occurred at PH=11.5. The test performed to determine the rate of removed MTBE as a result of air stripping showed that this rate was 1 1-19.5% at different PI-Is during 100 minutes. There was no significant relationship between the rate of removed MTBE as a result of air stripping and the aqueous PH at PHs=10-12 at level of 5% error. Conclusion: MTBE is relatively resistant to degradation even in advanced oxidation processes, but with continuous oxidation can be degraded completely and the best PH for that is 11.5.