响应面法优化Fenton处理高浓度制药废水

Optimization of Fenton process of high-concentration pharmaceutical wastewater based on response surface methodology

针对兰州某药厂高浓度制药废水难生物降解的特点,采用Fenton法对其进行预处理,考察了H_(2)O_(2)投加量、n(H_(2)O_(2))∶n(Fe^(2+))、进水pH值、H_(2)O_(2)投加次数、反应时间对Fenton试剂氧化处理制药废水的影响。在此基础上,以制药废水中COD去除率为响应值,建立响应值与5个自变量的二次多项式方程模型。通过Box-Behnken响应曲面可知,双氧水投加量的影响最为显著。结果表明,Fenton试剂氧化处理制药废水的优化工艺条件为:H_(2)O_(2)投加量5 mL/L、投加次数3次、n(H_(2)O_(2))∶n(Fe^(2+))=12∶1、进水pH_(3)、反应时间90 min。经实验验证,响应面的预测值与实验值基本相符,研究结果表明Fenton法对高浓度制药废水中的有机物具有良好的去除效果。

Aiming at the high-concentration pharmaceutical wastewater of a pharmaceutical factory in Lanzhou that is difficult to biodegrade,the Fenton method was used to pretreat it,and the H_(2)O_(2) dosage,n(H_(2)O_(2))∶n(Fe^(2+)),pH value of the influent water,H_(2)O_(2) dosing times and were investigated.On this basis,taking the COD removal rate in the pharmaceutical wastewater as the response value,a quadratic polynomial equation model with the response value and five independent variables was established.According to the Box-Behnken response surface,the influence of the dosage of hydrogen peroxide is the most significant.The results show that the optimal process conditions for Fenton reagent oxidetion treatment of pharmaceutical wastewater are:H_(2)O_(2) dosage 5 mL/L,n(H_(2)O_(2))∶n(Fe^(2+))=12∶1,inlet water pH_(3),H_(2)O_(2) dosage 3 times,reaction time 90 min.Verified by the experiment,the response predicted value is consistent with the experiment,the results showed that Fenton method for high concentration pharmaceutical wastewater has good removal effect of organic matter.