Vieira Yasmin, Pereira Hércules A, Leichtweis Jandira, Mistura Clóvia M, Foletto Edson L, Oliveira Luis F S, Dotto Guilherme L
Graduate Program in Chemistry, Federal University of Santa Maria, 97105-900 Santa Maria, Brazil.
Institute of Exact Sciences and Geosciences, University of Passo Fundo, BR 285, 99052-900 Passo Fundo, Brazil.
Sci Total Environ. 2021 Aug 20;783:146991. doi: 10.1016/j.scitotenv.2021.146991. Epub 2021 Apr 9.
Real hospital wastewater was effectively treated by a promising technology based on degradation reaction catalyzed by Fe under microwave irradiation in this work. Fe powders were synthesized and characterized by different techniques, resulting in a single-phase sample with spherical particles. Optimum experimental conditions were determined by a central composite rotatable design combined with a response surface methodology, resulting in 96.8% of chemical oxygen demand reduction and 100% organic carbon removal, after applying MW power of 780 W and Fe dosage of 0.36 g L for 60 min. Amongst the several organic compounds identified in the wastewater sample, diclofenac and ibuprofen were present in higher concentrations; therefore, they were set as target pollutants. Both compounds were completely degraded in 35 min of reaction time. Their plausible degradation pathways were investigated and proposed. Overall, the method developed in this work effectively removed high concentrations of pharmaceuticals in hospital wastewater.
在本研究中，基于微波辐射下铁催化降解反应的一项有前景的技术有效地处理了实际医院废水。合成了铁粉并用不同技术对其进行了表征，得到了具有球形颗粒的单相样品。通过中心复合旋转设计结合响应面方法确定了最佳实验条件，在施加780 W的微波功率和0.36 g/L的铁用量60分钟后，化学需氧量降低了96.8%，有机碳去除率达到100%。在废水样品中鉴定出的几种有机化合物中，双氯芬酸和布洛芬的浓度较高；因此，将它们设定为目标污染物。两种化合物在35分钟的反应时间内完全降解。研究并提出了它们可能的降解途径。总体而言，本研究中开发的方法有效地去除了医院废水中高浓度的药物。
