Espinoza Josué Daniel García, Drogui Patrick, Zolfaghari Mehdi, Dirany Ahmad, Ledesma Maria Teresa Orta, Gortáres-Moroyoqui Pablo, Buelna Gerardo
Instituto de Ingeniería, Universidad Nacional Autónoma de México, Cd. Universitaria, 04510, México City, D.F., México.
Institut national de la recherche scientifique (INRS-Eau, Terre et Environnement), Université du Québec, 490 rue de la Couronne, Québec, QC, G1K 9A9, Canada.
Environ Sci Pollut Res Int. 2016 Jun;23(12):12164-73. doi: 10.1007/s11356-016-6304-2. Epub 2016 Mar 14.
Di (2-ethylhexyl) phthalate (DEHP) is the most detected and concentrated plasticizer in environment and wastewaters, worldwide. In this study, different operating parameters such as current intensity, treatment time, type of anodes, and supporting electrolytes were tested to optimized the electro-oxidation process (EOP) for the removal of DEHP in the presence of methanol as a dissolved organic matter. Among the anodes, the Nb/BDD showed the best degradation rate of DEHP, at low current intensity of 0.2 A after 90 min of treatment time with a percentage of degradation recorded of 81 %, compared to 70 % obtained with the Ti/IrO2-RuO2. Furthermore, due to the combination of direct and indirect oxidation, the removal of DEHP in the presence of 1 g/L Na2SO4 was higher than NaBr, even though the oxidant production of NaBr was 11.7 mmol/L against 3.5 mmol/L recorded in the presence of sulfate at 0.5 A and after 60 min of electrolysis time. Under optimal condition (current intensity = 0.5 A, time = 120 min, using Nb/BDD anode and Na2SO4 as supporting electrolyte), the removal of 87.2 % of DEHP was achieved. The total cost of 0.106 US$/m(3) of treated water was achieved based on economical optimization of reactor with current intensity of 0.2 A and 1 g/L Na2SO4.
邻苯二甲酸二（2-乙基己基）酯（DEHP）是全球环境和废水中检测到且含量最高的增塑剂。在本研究中，测试了不同的操作参数，如电流强度、处理时间、阳极类型和支持电解质，以优化电氧化过程（EOP），用于在存在甲醇作为溶解有机物的情况下去除DEHP。在阳极中，Nb/BDD在0.2 A的低电流强度下处理90分钟后，对DEHP的降解率最佳，记录的降解百分比为81%，相比之下，Ti/IrO2-RuO2的降解率为70%。此外，由于直接氧化和间接氧化的结合，在存在1 g/L Na2SO4的情况下，DEHP的去除率高于NaBr，尽管在0.5 A电流强度和60分钟电解时间后，NaBr产生的氧化剂为11.7 mmol/L，而硫酸盐存在时记录为3.5 mmol/L。在最佳条件下（电流强度 = 0.5 A，时间 = 120分钟，使用Nb/BDD阳极和Na2SO4作为支持电解质），实现了87.2%的DEHP去除率。基于对电流强度为0.2 A和1 g/L Na2SO4的反应器进行经济优化，处理后水的总成本达到0.106美元/m³。
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