This study aimed to investigate the treatment of paint production industry (PPI) wastewater, which is characterized by low biodegradability and high concentrations of resistant organic matter, by persulfate enhanced electrocoagulation process (EC-PS). A regression quadratic model was developed to describe the removal of chemical oxygen demand (COD) and color number (CN) from PPI wastewater. The effects of independent variables (initial pH, PS dose, current density, and reaction time) on system responses and the interaction between the parameters were determined. Validation experiments were carried out under the optimum conditions determined by the quadratic model (initial pH: 5, PS dose: 5.6 g/L, current density: 21 mA/cm², and reaction time: 35 min) and 64% COD and 98.1% CN removal were obtained. Pollutant removal efficiencies increased with the increase of PS dose, current density, and reaction time while the highest removal efficiencies were achieved at acidic pH values. The scavenging studies indicated that although the sulfate radicals were the dominant radical type, both hydroxyl and sulfate radicals were involved in the process. In the synergistic effect studies performed under optimum conditions, the highest reaction rate was obtained in the EC-PS process with a value of 0.074 1/min. Specific energy consumption under optimum conditions was calculated as 20.4 kWh/kg COD. The results of the study showed that the EC-PS is an effective process for the treatment of PPI wastewater and response surface methodology is an applicable technique for the optimization of the variables.

本研究旨在研究通过过硫酸盐增强电凝聚工艺（EC-PS）处理涂料生产工业（PPI）废水的特点，该废水具有低生物降解性和高浓度抗性有机物的特点。开发了回归二次模型来描述从 PPI 废水中去除化学需氧量 (COD) 和色数 (CN)。确定了自变量（初始 pH、PS 剂量、电流密度和反应时间）对系统响应的影响以及参数之间的相互作用。验证实验在二次模型确定的最佳条件下进行（初始pH：5，PS剂量：5.6 g/L，电流密度：21 mA/cm ²和反应时间：35 分钟），获得 64% 的 COD 和 98.1% 的 CN 去除率。污染物去除效率随着 PS 剂量、电流密度和反应时间的增加而增加，而在酸性 pH 值下达到最高去除效率。清除研究表明，虽然硫酸根是主要的自由基类型，但羟基和硫酸根都参与了这个过程。在最佳条件下进行的协同效应研究中，EC-PS 工艺获得了最高的反应速率，值为 0.074 1/min。最佳条件下的单位能耗计算为 20.4 kWh/kg COD。