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研究了氧化剂KMn O4氧化水中二甲基三硫醚的效能,探讨了KMn O4投加量、二甲基三硫醚的初始浓度、pH值、腐植酸浓度以及同类臭味物质甲硫醚对氧化反应的影响,并对反应动力学进行了分析。结果表明:不同剂量的高锰酸钾对二甲基三硫醚有较强的氧化能力,基本完全氧化需要一定时间(达2 h)。随着高锰酸钾投量的增加,去除率和反应速率也随之增加,但高锰酸钾投加量不宜过多,建议最佳投加量为2 mg·L~(-1)。实验发现:二甲基三硫醚初始浓度、实际水体pH值以及腐殖酸浓度对氧化反应的影响不明显;但水中同类臭味物质甲硫醚对氧化反应有抑制作用,使反应进程变慢。高锰酸钾氧化二甲基三硫醚的反应符合二级反应动力学模型,二级反应的动力学常数为k=0.006 59 L·(min·mg)~(-1),理论曲线与实际反应曲线存在一定的差距,但整个反应过程中2条曲线反应的去除率的差距不大,因此理论曲线能较好的指导实践。
The effect of oxidant KMn O4 on dimethyl trisulfide oxidation was studied. The effects of KMn O4 dosage, initial concentration of dimethyl trisulfide, pH value, humic acid concentration and the same odor of methyl sulfide on oxidation Reaction, and analyzed the reaction kinetics. The results showed that different dosages of potassium permanganate had strong oxidation ability to dimethyl trisulfide, and it took a certain amount of time (up to 2 h) for the complete oxidation. With the increase of potassium permanganate dosage, the removal rate and reaction rate also increased, but the dosage of potassium permanganate should not be too much, the best dosage is 2 mg · L -1. The experimental results showed that the initial concentration of dimethyl trisulfide, the pH value of the actual water body and the concentration of humic acid had no obvious effect on the oxidation reaction. However, the same odor substance in water could inhibit the oxidation reaction and slow the reaction process . The reaction of potassium permanganate oxidation of dimethyl trisulfide with the second-order reaction kinetic model, the second-order reaction kinetic constant k = 0.006 59 L · (min · mg) -1, the theoretical curve and the actual There is a certain gap between the reaction curves, but there is not much difference in the removal rates of the two curves during the whole reaction process, so the theoretical curve can guide the practice better.