沉淀-Fenton氧化预处理甲基硫菌灵废水

研究沉淀-Fenton氧化对甲基硫菌灵生产废水的预处理,考察SCN^-和CODcr的去除效果。先加入Cu-SO4和Na2S2O3对SCN^-进行沉淀,考察CuSO4和Na2S2O3加入量对CODcr去除率的影响;对沉淀后水样进行Fenton氧化,通过改变pH值、H2O2浓度、Fe^2＋浓度、反应时间等得出该农药废水在常温下的最佳操作条件。实验结果表明,经过沉淀处理后的废水,pH值为4、H2O2投加量为6～7 g/L、Fe^2＋投加量为1.2～1.5 g/L,氧化时间为2～4 h,CODcr浓度从12 000 mg/L降至3 600 mg/L,总去除率达到了70%。

Study on Pretreatment of Thiophanate Methyl Wastewater by Precipitation and Fenton Regent Oxidation Method

The experiments were pretreated the thiophanate methyl wastewater in the processes of precipitation and Fenton regent oxidation,and it investigated on degradation efficiency of SCN^- and CODcr.In the pretreatment,the optimal mass concentration of CuSO4 and NaS2O3 were deter mined on the precipitation,then the effecting factors such as H2O2,Fe^2＋,pH value,reaction time in Fenton oxidation process were discussed.The results indicated that under the condition of solution pH 4,H2O2 mass concentration 6～7 g/L,Fe^2＋ mass concentration 1.2～1.5 g/L reaction time 2～4h,the CODcr of the wastewater can decrease from 12 000 mg/L to 3 600 mg/L and the total removal rate of CODcr can reach 70%.