铁炭活化过硫酸盐降解碱性高浓度有机废液

Degradation of alkaline high-concentration organic wastewater by zero-valent iron and activated carbon activated persulfate

采用零价铁与活性炭协同活化过硫酸盐处理碱性高浓度电镀槽有机废液。在原水COD≥10000 mg/L,pH为碱性的条件下,考察了过硫酸钠、零价铁与活性炭投加量以及反应时间、初始pH等因素对COD去除效果的影响,并通过正交实验确定了降解最优条件。结果表明:在过硫酸钠投加量为22 g/L,零价铁投加量为4.8 g/L,活性炭投加量为1.2 g/L,初始pH为11,反应时间为3 h的最优条件下,COD去除率达86.40%,TOC、TP去除率分别为66.95%、96.50%。对COD的降解过程符合一级反应动力学方程。

The organic wastewater of alkaline high-concentration plating tank was treated by advanced oxidation technology of persulfate(PS)activated with zero-valent iron(Fe)and activated carbon(AC).Under the conditions of initial COD higher than 10000 mg/L and pH over 7,the effects of PS dosages,zero-valent iron and AC dosages,initial pH,and reaction time on the degradation process were investigated,respectively.The optimal conditions for degradation were determined by orthogonal experiments.Results showed the optimum reaction conditions were at PS dosage of 22 g/L,zero-valent iron dosage of 4.8 g/L,AC dosage of 1.2 g/L and initial pH of 11 for reaction time of 3 h.Under this condition,the removal rates of COD reached 86.40%,and the removal rates of TOC and TP reached 66.95%and 96.50%,respectively.Besides,fitting results indicated the COD degradation followed the first-order kinetics equation well.