基于响应面法的超声强化铁碳微电解处理硝基苯废水工艺优化研究

针对超声波强化铁碳微电解法降解含硝基苯废水时各操作因素之间是否存在相互作用的问题,采用响应面法(RSM)对工艺条件进行了优化。实验中,选取29组有代表性的试验点,以超声波(US)功率、零价铁(Fe~0)剂量、活性炭(GAC)剂量、废水初始pH值为主要因素,硝基苯的去除率为响应值,设计了四因素三水平的响应面实验,得到了最优的工艺条件。结果表明,Fe~0剂量与废水初始pH值、废水初始pH值与超声功率之间存在明显的交互作用;当Fe~0剂量为20.7 g·L~(-1),GAC剂量为13.19 g·L~(-1),初始pH值为2.08,超声功率为175.96 W时,硝基苯去除率的预测值为98.50%。与实测值相差1.23%(2%)。因此得到超声强化铁碳微电解降解硝基苯的二次数学模型对工艺条件的优化及硝基苯去除率的预测具有良好的可靠性。

Treatment of Nitrobenzene Wastewater via Ultrasonic Enhanced Iron-carbon Micro-electrolysis with Response Surface Methodology

Aiming at whether there are interaction problem among various operating factors in the degradation of wastewater with nitrobenzene (NB) via an ultrasonic enhanced iron-carbon micro-electrolysis method, the process conditions were optimized by response surface methodology (RSM). In experiments, selecting 29 representative groups as the test points, taking ultrasonic (US) power, zero valent iron (Fe⁰) dosage, activated carbon (GAC) dosage, initial pH value of wastewater as main factors, removal efficiency of NB as response value, the response surface experiments of four factors and three levels were designed and the optimum process conditions were obtained. The results show that there is a significant interaction between Fe⁰ dosage and initial pH value, and initial pH value and ultrasonic power and predicted value of the removal efficiency of NB is 98.50% when the Fe⁰ dosage is 20.7 g·L^-1, the GAC dosage is 13.19 g·L^-1, the initial pH value is 2.08, the ultrasonic power is 175.96 W. A difference of 1.23%(<2%)is observed with the measured value. Therefore, the obtained secondary mathematical model for the degradation of NB via ultrasonic enhanced iron-carbon micro-electrolysis has a good reliability for the optimization of process conditions and the prediction of removal efficiency of NB.