O3/H2O2法降解甲基叔丁基醚（MTBE）的试验研究

采用自制鼓泡反应器对臭氧/双氧水(O3/H2O2)降解水中甲基叔丁基醚(MTBE)进行了试验研究,考察了进气(含O3)流量、H2O2 投加量、MTBE初始浓度、pH、温度等因素对MTBE降解的影响.结果表明,在MTBE初始浓度为10 mg·L-1,气体流量为0.5 L·min-1,温度293K, pH=6.5, H2O2 添加量为2.4mg·L1 条件下,反应30 min后, MTBE去除率可达75.5%, COD去除率为68.0%.降解得到的中间产物主要有叔丁基甲酯(TBF)、叔丁醇(TBA)、乙酸甲酯(MA)和丙酮(AC)等,据此探讨了O3/H2O2氧化MTBE的可能反应机理和降解途径.

Degradation of methyl tert-butyl ether (MTBE) by O3/H2O2

The degradation of methyl tert-butyl ether (MTBE) in water solution has been studied using the combination of ozone/hydrogen peroxide in a bubble column. Effects of air (containing O3) currents, quantities of H2O2, initial concentrations of MTBE, pH values and temperatures on the oxidation of MTBE have been tested, and it is implicated that under the conditions of initial MTBE concentration of 10 mg x L(-1), air current of 0.5 L x min(-1), pH 6.5, 293 K and 2.4 mg x L(-1) H2O2 addition, MTBE can be reduced by 75.5% and the removal rate of COD reaches 68.0% within 30 min. The main of degradation products identified are tert-butyl formate (TBF), tert-butyl alcohol (TBA), acetone (AC) and methyl acetate (MA). On the basis of that, the probable mechanism and pathway of the oxidation of MTBE by ozone/hydrogen peroxide have been proposed.