Department of Chemistry, Faculty of Science, Universidad del Valle, AA 25360 Cali, Colombia.
J Hazard Mater. 2010 May 15;177(1-3):851-5. doi: 10.1016/j.jhazmat.2009.12.111. Epub 2010 Jan 6.
The department of Valle del Cauca is the region with the largest sugarcane production in Colombia. This agricultural activity uses high quantities of herbicides, mainly Diuron and 2,4-Dichlorophenoxyacetic acid. Wastewater generated in the washing process of spray equipment and empty pesticide containers must be treated to keep natural water sources from being polluted with these pesticides when these effluents are disposed off. Conventional biological treatments are not able to remove recalcitrant substances like Diuron and 2,4-Dichlorophenoxyacetic acid; therefore, it is essential to have alternative treatment systems. In recent years, photocatalytic processes have been proven efficient methods in treating polluted water with recalcitrant organic substances. This study sought to evaluate the efficiency of a coupled treatment constituted for a solar photo-Fenton treatment and a biological system like an immobilized biological reactor to treat industrial wastewater containing pesticides (2,4-Dichlorophenoxyacetic acid and Diuron). The mineralization and degradation of pesticides were followed by measuring the dissolved organic carbon and pesticide concentrations. The results revealed that industrial wastewaters with high Diuron and 2,4-Dichlorophenoxyacetic acid concentrations can be successfully treated by a combined solar photo-Fenton-biological system, achieving mineralization of 79.8% in prepared wastewater and 82.5% in real industrial wastewater by using low Fe(2+) and H(2)O(2) concentrations.
瓦尔迪维亚省是哥伦比亚甘蔗产量最大的地区。这种农业活动使用大量的除草剂，主要是敌草隆和 2,4-二氯苯氧乙酸。喷雾设备和空农药容器清洗过程中产生的废水必须经过处理，以防止这些废水排放时污染天然水源中的这些农药。常规的生物处理方法无法去除敌草隆和 2,4-二氯苯氧乙酸等难降解物质；因此，必须有替代的处理系统。近年来，光催化过程已被证明是处理难降解有机物质污染水的有效方法。本研究旨在评估由太阳能光芬顿处理和生物系统（如固定化生物反应器）组成的耦合处理系统处理含农药（2,4-二氯苯氧乙酸和敌草隆）的工业废水的效率。通过测量溶解有机碳和农药浓度来跟踪农药的矿化和降解。结果表明，高浓度敌草隆和 2,4-二氯苯氧乙酸的工业废水可以通过组合的太阳能光芬顿-生物系统成功处理，在制备废水中实现 79.8%的矿化率，在实际工业废水中实现 82.5%的矿化率，同时使用低浓度的 Fe(2+)和 H(2)O(2)。
