高铁酸钾联合H_2O_2对酸性红B废水的预处理试验研究

Experimental study on pretreatment of acid red B wastewater by potassium ferrate combined H_2O_2

应用高铁酸钾与H2O2对酸性红B废水进行预处理,在2.5×10-4mol/L的酸性红B染料废水中,先加入10-4mol/L高铁酸钾反应3 min,再加入0.02 mol/L H2O2,pH控制在3.5,废水的色度去除效率达99%以上,CODcr的去除效率为75%左右.高铁酸钾与H2O2联用降解酸性红B,分别比单独使用H2O2与单独使用高铁酸钾的效果好.推测原因可能有高铁酸钾的氧化性、高铁酸钾的还原产物与H2O2形成的芬顿试剂与铁离子的絮凝综合所起的作用.

We use potassium ferrate and hydrogen peroxide to pretreat dyeing wastewater, 10^-4 mol/L potassium ferrate was added into the 2.5 × 10^- 4 mol/L of acid red B dye wastewater to start the reaction, 3 rain later 0.02 mol/L H2O2 was added and pH was controlled at 3.5. The removal rate of chromaticity reached above 99% and the degradation efficiency of CODer reached 75 %. The degradation efficiency of acid red B was better when it is treated by potassium ferrate and H2O2 together than by either H2O2 or potassium ferrate alone. This probably due to the high oxidizability of potassium ferrate and the flocculation came from Fenton＇s reagent, which is the reduction products of potassium ferrate and H2O2.