磁芬顿处理DMAC废水的实验研究

Magnetic-Fenton Method for Treatment of DMAC Wastewater

N-N二甲基乙酰胺(DMAC)是化纤废水的主要污染物,具有毒性大,生物难降解等特点.研究了磁芬顿法和芬顿法处理DMAC的效果,探讨了最佳处理条件及降解机理.结果表明:在FeSO4·7H2O的投加量为12g/L,H2O2的投加量为12mL/L,pH值为3.0,反应时间为60min的条件下,原水浓度为250mg/L的DMAC模拟废水处理实验中,磁芬顿法的COD去除率为82.1%,较未磁化提高18.5%.动力学研究表明,磁芬顿法和芬顿法降解COD符合一级反应,反应速率常数分别为0.029min-1和0.013min-1,磁场可加快芬顿反应速度.

N-N-dimethyl acetamide（DMAC）is a main pollutant of chemical fiber wastewater,and has the characteristics of serious toxicity and non-degradability.The effects of magnetic-Fenton and Fenton methods on the treatment of DMAC wasterwater were studied and the optimized treatment conditions and the degradation mechanism were explored.Results show that the DMAC removal efficiency reached 82.1% under the treatment conditions of pH at 3,reaction time at 60 min,raw water concentration at 250mg/L,H2O2 at 12mL/L,and FeSO4·7H2O at 12g/L,the removal rate of COD increased by 18.5% using magnetic-Fenton method.Kinetic studies indicated that the degradation of COD using magnetic-Fenton and Fenton methods obeyed the first-order kinetic model,and their reaction rate constants were 0.029min^-1and 0.015min^-1.The study shows that magnetic field may accelerate the speed of Fenton reaction.