化学沉淀法处理化学镀镍废水的数学模型及应用

Mathematical model for treating electroless nickel plating wastewater by chemical precipitation and its application

采用二次回归正交旋转组合设计法,研究化学沉淀法对低浓度化学镀镍废水中镍的处理效果,得到了反应温度、石灰乳投加量及反应时间与废水中剩余镍之间关系的数学模型。实验结果和模型分析表明,适当提高反应温度、石灰乳投加量及反应时间,有利于降低废水中镍的浓度,且三个因素之间存在交互作用。模型预测结果显示,当石灰乳投加量达到7mL/50mL废水时,在高于75℃的反应温度,且大于90min的反应时间的组合试验条件下,该废水中镍的浓度降至1.mg/L以下。模型预测结果和实验结果均表明,所用方法可以使废水中的镍实现达标排放。

An experimental design of quadratic quadrature rotation combination was used to study on removal of lower concentration of nickel ion in electroless nickel plating wastewater by chemical precipitation. A math-ematir model was established for the relationship between the residue concentration of nickel ion and the experimental parameters, which were temperature, amount of precipitator (lime milk) and reactive time. Experimental results and analysis made with the model showed that higher temperature, larger amount of precipitator added and longer reactive time could decrease the residue concentration of nickel ion in wastewater, and these three parameters had interactive effects on the removal efficiency of nickel ion;the nickel ion concentration could be below 1.0 mg/L when reactive temperature(>75℃) and reaction time(>90miri) were matched properly with 7mL lime milk/50 mL wastewater. This forecast values were demonstrated by I he experimental results.