O3/H2O2氧化工艺去除水中硝基苯的研究

以硝基苯为代表性有机污染物 ,对比了臭氧化和O3/H2 O2 高级氧化工艺对水中硝基苯的去除效果 .发现与臭氧化相比 ,O3/H2 O2 高级氧化工艺可以显著地提高水中硝基苯的去除效率 .无论在臭氧化还是在O3/H2 O2 高级氧化工艺中 ,水中硝基苯的降解都主要是由OH·完成的 .通过考察O3/H2 O2 高级氧化工艺去除水中硝基苯的影响因素发现 ,在O3和过H2 O2 投量相同的条件下 ,多次投加O3和催化剂H2 O2 对水中硝基苯的处理效果明显优于一次性投加 ;在本次试验条件下 ,O3/H2 O2 高级氧化工艺降解蒸馏水和自来水中硝基苯的最优H2 O2 与O3摩尔比均为 0 5 ,HCO- 3碱度水平 (以CaCO3计 )在低于 1 0 0mg/L范围内对去除硝基苯无显著影响

Study on removal of nitrobenzene in water by O3/H2O2

Comparative experiments of ozonation and O3/H2O2 processes were conducted with nitrobenzene as the model organic pollutant. It was found that O3/H2O2 greatly increased the removal efficiency of nitrobenzene compared with that achieved by ozonation alone. It was believed that both in ozonation and O3/H2O2 processes nitrobenzene was primarily oxidized by OH.. Several factors that are likely to influence O3/H2O2 process in practical application were investigated. Experimental results demonstrated that with the same dosage of applied ozone and hydrogen peroxide, the multiple steps addition of ozone and hydrogen peroxide showed a much higher removal efficiency than that obtained by adding hydrogen peroxide within one step before the start of the experiment. Under the conditions of this experiment, the optimum molar ratios of hydrogen peroxide to ozone for the removal of nitrobenzene in distilled water and tap water were proved to be both 0.5, no significant negative effect was observed when the alkalinity levels (as CaCO3) were less than 100 mg/L.