Wastewater collected from a local jean manufacturing plant was treated using an electrocoagulation process (EC) coupled with activated carbon (AC) adsorption. The process variables were optimized using multivariate regression coupled with nonlinear programming with nonlinear restrictions to achieve the lowest possible cost while keeping a high enough degradation rate for chemical oxygen demand (COD), color, and turbidity to fulfill the Colombian environmental regulation requirements. Under optimal conditions (pH = 5.4, σ =2 mS/cm, j =14 mA/cm², and t = 11 min) color, COD, and TOC removals of 95%, 63%, and 51%, respectively, were achieved. The biodegradability index also increased from 0.13 to 0.29, whereas toxicity tests showed a remaining toxicity of 45%. A kinetic study was conducted for the EC process. The activated carbon (AC) adsorption process was successfully used to completely remove toxicity, while further increasing color, COD, and TOC removals to 96%, 72%, and 61%, respectively. The conditions for the AC adsorption process (20 g/L of AC and 1 h) were determined by experimental adsorption isotherms and kinetic studies. The optimized EC/AC process led to an effluent satisfying the Colombian regulations and seems technologically viable with lower costs than other similar process that were reported in previous works.

使用电凝工艺（EC）和活性炭（AC）吸附处理从当地牛仔裤生产厂收集的废水。使用多元回归结合非线性规划和非线性限制对过程变量进行了优化，以实现最低的成本，同时保持足够高的化学需氧量（COD），颜色和浊度降解率，以满足哥伦比亚的环境法规要求。在最佳条件下（pH = 5.4，σ= 2 mS / cm，j = 14 mA / cm ²，并且t = 11分钟），分别实现了95％，63％和51％的颜色，COD和TOC去除率。生物降解指数也从0.13增加到0.29，而毒性测试表明残留毒性为45％。对EC过程进行了动力学研究。活性炭（AC）吸附过程已成功用于完全去除毒性，同时进一步将颜色，COD和TOC的去除率分别提高到96％，72％和61％。通过实验吸附等温线和动力学研究确定了AC吸附过程的条件（20 g / L AC和1 h）。经过优化的EC / AC工艺可以使废水满足哥伦比亚的法规，并且在技术上比以前的工作中报道的其他类似工艺成本更低。