【摘要】 [目的]针对重金属络合废水处理过程中存在的难以实时监测与控制的困境，提出了以电化学信号为指示因子的工艺参数优化调控策略。[方法]以模拟废水和实际印刷线路板(PCB)重金属络合废水为研究对象，探究废水处理中氧化还原电位(ORP)、电导率(EC)、p H等电化学信号与处理过程之间的联系，建立水质预测模型。[结果]电化学信号与物质浓度之间存在明显的线性关系，可基于此选择多重线性逐步回归法来建立水质预测模型。芬顿氧化工艺处理实际重金属络合废水实验的结果表明，在H2O2浓度为10mmol/L时ORP达到峰值，COD(化学需氧量)去除率高达75.3%。所建立的芬顿氧化工艺和碱沉工艺水质预测模型的决定系数(R2)分别为0.806和0.912。[结论]本研究所建立基于电化学信号的重金属络合废水优化调控策略对实际废水处理具有一定的指导意义。更多还原

【Abstract】 [Introduction] As for the difficulty in real-time monitoring and control of complexed heavy metalcontaining wastewater during treatment process, a strategy for optimization and control of the process parameters with electrochemical signals as indicators was proposed. [Method] Simulated wastewater and actual complexed heavy metal-containing wastewater discharged from printed circuit board(PCB) production were applied to study the correlation between the electrochemical signals such as oxidation–reduction potential(ORP), electrical conductivity(EC), and p H during their treatment process, aiming to establish some water quality prediction models. [Result] There is an obvious linear correlation between electrochemical signal and substance concentration, allowing the application of multiple linear stepwise regression for establishing the water quality prediction models. The experimental results of Fenton oxidation treatment for actual complexed heavy metal-containing wastewater indicated that the ORP reached its maximum when the H2O2 concentration was 10 mmol/L, with a chemical oxygen demand(COD) removal rate as high as 75.3%. The coefficient of determination(R2) of the prediction model was 0.806 for Fenton oxidation process and 0.912 for alkaline precipitation process. [Conclusion] The optimization and control strategy for complexed heavy metal-containing wastewater based on electrochemical signals established in this paper has certain guiding significance for actual wastewater treatment.更多还原