响应曲面法优化EF-FeO_(x)体系处理餐厨废水

Optimization of EF-FeO_(x) system for treating kitchen wastes fermentation liquid

采用外加过氧化氢(H_(2)O_(2))的电芬顿-铁氧化体系(EF-FeO_(x)体系)处理餐厨垃圾发酵液MBR出水。探究了H_(2)O_(2)投加量、电流密度、反应时间对餐厨垃圾发酵液污染物去除率的影响,并用响应曲面法对以上3个因素进行优化,预测的最佳条件为:H_(2)O_(2)投加量为1.94 mmol、电流密度为0.0165 A/cm^(2)、反应时间为45 min;预测的餐厨垃圾发酵液的COD去除率为64.77%,验证实验的平均去除率为64.32%,相对偏差为2.8%。对比进出水三维荧光光谱(3D-EEM)可知,餐厨垃圾发酵液MBR出水的污染物在反应过程中被部分降解,自由基识别(EPR)结果显示·OH起主要氧化作用。

The electro-Fenton-FeO_(x)system with externally added hydrogen peroxide is applied to treat with MBR effluent from kitchen wastes fermentation liquid.The effects of H_(2)O_(2)concentration,current density and reaction time on COD removal efficiency are investigated,and these three factors are optimized by using response surface methodology.The predicted optimal conditions are as follows:H_(2)O_(2)concentration is 1.94 mmol·L^(-1),current density is 0.0165 A·cm^(-2)and reaction time is 45 min.It is predicted that the removal efficiency of COD is 64.77%under the optimal conditions.It is verified via experiments that the average removal efficiency of COD reaches 64.32%,showing a deviation of 2.8%.The pollutants in MBR effluent from kitchen wastes fermentation liquid are partly degraded during the reaction according to 3D-EEM and EPR results.It is indicated by free radical recognition results that·OH plays a major role in oxidation.