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Comparative experiment of O_3 and Mn(Ⅱ)-catalyzed ozonation processes were conducted with 2,4,6-trinitrotoluene(TNT) as the model pollutant to research the efficacy of Mn(Ⅱ) for enhancing ozonation.It is found that Mn(Ⅱ)-catalyzed ozonation greatly increases the removal efficiency of TNT and COD compared with that achieved by ozonation alone.Several factors that are likely to influence Mn(Ⅱ)-catalysed ozonation process in practical application are investigated.Experimental results demonstrate that the factors...

Comparative experiment of O_3 and Mn(Ⅱ)-catalyzed ozonation processes were conducted with 2,4,6-trinitrotoluene(TNT) as the model pollutant to research the efficacy of Mn(Ⅱ) for enhancing ozonation.It is found that Mn(Ⅱ)-catalyzed ozonation greatly increases the removal efficiency of TNT and COD compared with that achieved by ozonation alone.Several factors that are likely to influence Mn(Ⅱ)-catalysed ozonation process in practical application are investigated.Experimental results demonstrate that the factors include the wastewater pH and TNT concentration,the catalyst dosage and its adding method,ozone dosage and concentration.

火炸药废水中常见的三硝基甲苯(TNT)为代表性污染物,利用该污染物的去除率及废水化学耗氧量(COD)的变化为评价指标,采用静态实验方法,对比研究了臭氧(O3)单独作用及Mn(Ⅱ)催化臭氧化TNT的降解功效。结果表明:与O3单独作用相比,Mn(Ⅱ)催化臭氧化作用不仅提高TNT去除率,也促进了COD的减少。通过考察Mn(Ⅱ)催化臭氧化降解TNT的影响因素发现,Mn(Ⅱ)催化作用的发生与废水初始pH无关,但作用大小不仅与pH有关,而且还受催化剂的投量与投加方式、TNT初始浓度及O3投加量等的影响。

 
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