Environmental Science and Technology Research Center, Department of Environmental Health Engineering, School of Public Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
Student Research Committee, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
Environ Sci Pollut Res Int. 2021 Sep;28(33):45041-45049. doi: 10.1007/s11356-021-13921-7. Epub 2021 Apr 15.
Cardboard factory wastewater is usually known by high chemical oxygen demand (COD), color, phenols, lignin, and its derivatives, and usual treatment techniques are not able to treat such wastewaters. This study aimed to investigate the efficiency of ozone-assisted electrocoagulation process (EC/O) for the treatment of real cardboard wastewater. The parameters influencing COD removal in the EC/O process were optimized using response surface methodology. Regard to the statistical model, the optimum conditions were obtained at current density 9.6 mA/cm, time 20 min, and pH 12. At optimal condition, EC/O process removed 74.7% and 97.5% of COD and color, which was higher compared to ozonation and EC processes separately. The COD removal followed pseudo-first-order kinetic with the coefficient correlation of 0.97 and the reaction rate constant of 0.073 1/min. To sum up, the combined electrocoagulation process with ozonation could be used satisfactorily for removing pollutants from real cardboard wastewater.
纸板厂废水通常具有高化学需氧量（COD）、色度、酚类、木质素及其衍生物等特点，一般的处理技术难以有效处理此类废水。本研究旨在探讨臭氧辅助电絮凝工艺（EC/O）处理实际纸板废水的效果。采用响应面法优化了 EC/O 工艺中影响 COD 去除率的参数。根据统计模型，在电流密度为 9.6 mA/cm、时间为 20 min、pH 值为 12 的最佳条件下，EC/O 工艺可分别去除 74.7%和 97.5%的 COD 和色度，去除效果优于单独的臭氧氧化和电絮凝工艺。COD 去除符合准一级动力学，相关系数为 0.97，反应速率常数为 0.073 1/min。综上所述，臭氧辅助电絮凝工艺可有效去除实际纸板废水中的污染物。
