López-Velázquez Khirbet, Villanueva-Rodríguez Minerva, Mejía-González Gamaliel, Herrera-López David
El Colegio de la Frontera Sur, Tapachula, Chiapas, México.
Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León (UANL), San Nicolás de los Garza, Nuevo León, México.
Environ Technol. 2021 Oct;42(24):3771-3782. doi: 10.1080/09593330.2020.1740799. Epub 2020 Mar 18.
In aquatic systems, some substances considered as endocrine disruptors have been detected, which can be due to their incomplete elimination in wastewater treatment plants (WWTPs) and inadequate disposal of pharmaceuticals. Among these contaminants are 17α-ethinylestradiol (EE2) and caffeine (CAF). Moreover, it has been reported that this kind of contaminants may provoke different adverse effects in many aquatic organisms. Because of that, in the present study, up-flow anaerobic sludge blanket reactors (UASB) coupled with the Fenton process was evaluated for EE2 and CAF removal spiked in wastewater samples. First, the best reaction conditions were established in each process. For UASB reactor, two hydraulic retention times (HRT 8 and 24 h) were evaluated, achieving the highest chemical organic demand (COD) removal (70 %) and drug elimination (84 %-86 %) with HRT 24 h. Subsequently, Fenton process was conducted at pH 3 with different levels of Fe (0.05-0.5 mmol/L) and molar ratios Fe:HO (1:1-1:10). Better results were obtained with 0.5 mmol Fe/L, and 1:10 ratio molar Fe:HO. Finally, UASB-Fenton coupled system allowed 80 % of COD decrease, almost complete removal of drugs and the toxicity of samples on was reduced from 73 % to 30 %, demonstrating that this coupled system is a promising and efficient system for pharmaceutical compounds removal from wastewater.
在水生系统中，已检测到一些被视为内分泌干扰物的物质，这可能是由于它们在污水处理厂（WWTPs）中未被完全去除以及药品处置不当所致。这些污染物包括17α-乙炔雌二醇（EE2）和咖啡因（CAF）。此外，据报道，这类污染物可能会对许多水生生物产生不同的不利影响。因此，在本研究中，评估了上流式厌氧污泥床反应器（UASB）与芬顿工艺相结合对废水中添加的EE2和CAF的去除效果。首先，在每个工艺中确定了最佳反应条件。对于UASB反应器，评估了两种水力停留时间（HRT为8小时和24小时），在HRT为24小时时实现了最高的化学需氧量（COD）去除率（70%）和药物去除率（84%-86%）。随后，在pH值为3的条件下，对不同铁含量（0.05-0.5 mmol/L）和铁与过氧化氢的摩尔比（1:1-1:10）进行了芬顿工艺实验。在铁含量为0.5 mmol/L和铁与过氧化氢的摩尔比为1:10时获得了更好的结果。最后，UASB-芬顿耦合系统使COD降低了80%，几乎完全去除了药物，样品的毒性从73%降低到30%，表明该耦合系统是一种从废水中去除药物化合物的有前景且高效的系统。
