Mg_(75)Zn_(20)Ca_5非晶条带对氧乐果农药废水的降解作用

Degradation effect of Mg_(75)Zn_(20)Ca_5 amorphous ribbon on omethoate pesticide wastewater

为了有效降低有毒农药废水对环境造成的危害,以Mg_(75)Zn_(20)Ca_5非晶条带为催化剂,采用类Fenton法研究了模拟氧乐果农药废水的pH值、H_2O_2用量和反应时间对化学需氧量(COD)的影响.结果表明,与传统Fenton法要求废水为酸性溶液的特点相比,当类Fenton法中的废水为中性溶液时,有利于提高废水的COD去除率.当H2O2的体积分数为2%时,COD去除率可以达到最大值.COD去除率随反应时间的延长而提高,在最初的10 min内,COD去除率高达47.32%,而当反应进行30 min后,COD去除率可以达到58.46%.虽然Mg_(75)Zn_(20)Ca_5非晶条带表面形成了少量MgO,但其非晶结构基本不变.与氧乐果废水的单一降解方法相比,该类Fenton法具有一定的优越性.

In order to reduce the harmful effect caused by toxic pesticide wastewater on the environment, the Mg75Zn20Ca5 amorphous ribbon was taken as the catalyst, and the effect of pH value, H2O2 dosage and reaction time of the simulated omethoate pesticide wastewater on the chemical oxygen demand （COD） was investigated with the Fenton-like method. The results show that compared with the feature of traditional Fenton method where the required wastewater should be acid solution, when the wastewater used in the Fenton-like method is the neutral solution, it is beneficial to improving the removal rate of COD in the wastewater. When the volume fraction of HeO2 is 2%, the removal rate of COD can reach the maximum value. Moreover, the removal rate of COD increases with prolonging the reaction time. In addition, the removal rate of COD reaches as high as 47.32% in the initial 10 minutes, and can reach 58.46% after the reaction for 30 minutes. Although a small amount of MgO forms on the surface of Mg75Zn20Ca5 amorphous ribbon, the amorphous structure of amorphous ribbon is basically unchanged. Compared with the single degradation method for omethoate wastewater, the proposed Fenton-like method has certain superiority.