GIPAB: Grupo de Investigación en Procesos Ambientales y Biotecnológicos, Departamento de Ingeniería de Procesos, Universidad EAFIT, Carrera 49 #7 sur 50, Medellín, Colombia.
Water Sci Technol. 2009;60(11):2809-18. doi: 10.2166/wst.2009.705.
In this work, the Box-Benkhen experimental Design (BBD) was applied for the optimization of the parameters of the electrocatalytic degradation of wastewaters resulting from a phenolic resins industry placed in the suburbs of Medellin (Colombia). The direct and the oxidant assisted electro-oxidation experiments were carried out in a laboratory scale batch cell reactor, with monopolar configuration, and electrodes made of graphite (anode) and titanium (cathode). A multifactorial experimental design was proposed, including the following experimental variables: initial phenol concentration, conductivity, and pH. The direct electro-oxidation process allowed to reach ca. 88% of phenol degradation, 38% of mineralization (TOC), 52% of Chemical Oxygen Demand (COD) degradation, and an increase in water biodegradability of 13%. The synergetic effect of the electro-oxidation process and the respective oxidant agent (Fenton reactant, potassium permanganate, or sodium persulfate) let to a significant increase in the rate of the degradation process. At the optimized variables values, it was possible to reach ca. 99% of phenol degradation, 80% of TOC and 88% of COD degradation. A kinetic study was accomplished, which included the identification of the intermediate compounds generated during the oxidation process.
在这项工作中，应用了 Box-Benkhen 实验设计（BBD）来优化位于哥伦比亚麦德林郊区的酚醛树脂工业废水的电化学催化降解的参数。直接和氧化剂辅助的电氧化实验在实验室规模的批处理电池反应器中进行，采用单极配置，电极由石墨（阳极）和钛（阴极）制成。提出了一个多因素实验设计，包括以下实验变量：初始苯酚浓度、电导率和 pH 值。直接电氧化过程可使苯酚降解率达到约 88%，TOC 矿化率达到 38%，COD 降解率达到 52%，水生物降解性提高 13%。电氧化过程和各自的氧化剂（芬顿试剂、高锰酸钾或过硫酸钠）的协同作用显著提高了降解速率。在优化的变量值下，苯酚降解率可达约 99%，TOC 降解率可达 80%，COD 降解率可达 88%。完成了一项动力学研究，包括鉴定氧化过程中生成的中间化合物。
