Department of Chemical Engineering, University of Almería, 04120 Almería, Spain; CIESOL, Joint Centre of the University of Almería-CIEMAT, 04120 Almería, Spain.
CIESOL, Joint Centre of the University of Almería-CIEMAT, 04120 Almería, Spain; Plataforma Solar de Almería (CIEMAT), 04200 Tabernas, Almería, Spain.
Sci Total Environ. 2014 Apr 15;478:123-32. doi: 10.1016/j.scitotenv.2014.01.066. Epub 2014 Feb 12.
The presence of low concentrations of persistent pollutants in waters (μg/L or ng/L), also called micropollutants, brings as a consequence the need to apply advanced oxidation treatments for their removal. The successful application of solar-driven photo-Fenton to treat highly polluted wastewaters (g/L and mg/L of pollutants) has prompted its application to lowly polluted effluents. However, a decrease in contaminant concentration may involve an alteration in the intrinsic process phenomenon, which until now has only been widely studied at the milligram-per-litre level or higher with this process. The aim of this research was to study the combined influence of the operating variable (iron concentration) and the environmental variable (irradiance) and application on the photo-Fenton process at pH2.8 when removing micropollutants. For this purpose, experimentation was carried out at laboratory and pilot plant scales with a biocide mixture of acetamiprid (ACTM), thiabendazole (TBZ) and imazalil (IMZ) (100 μg/L each) as the model pollutant. Results indicated that above 15 WUV/m(2) and a light path length of 5 cm (the most commonly used path for this type of application) iron concentration limited the process and there was irradiance excess under these conditions. On the other hand, and given the circumstances of irradiance excess, a higher light path length (10 cm) was assessed. Results showed that path lengths wider than 5 cm are recommended since more wastewater volume could be treated with a higher process rate per surface unit.
水中（μg/L 或 ng/L）低浓度的持久性污染物（也称为微量污染物）的存在，导致需要应用高级氧化处理来去除它们。太阳能驱动的光芬顿法成功地用于处理高度污染的废水（污染物的 g/L 和 mg/L），促使其应用于低度污染的废水。然而，污染物浓度的降低可能会涉及到内在过程现象的改变，到目前为止，这个过程仅在毫克/升或更高的水平上进行了广泛的研究。本研究的目的是研究在 pH2.8 时，操作变量（铁浓度）和环境变量（辐照度）的联合影响以及在去除微量污染物时对光芬顿过程的应用。为此，在实验室和中试规模上进行了实验，以含有杀虫剂混合物的啶虫脒（ACTM）、噻菌灵（TBZ）和抑霉唑（IMZ）（各 100μg/L）作为模型污染物。结果表明，在 15 WUV/m(2)以上和 5cm 光程（这种应用类型最常用的光程）下，铁浓度限制了该过程，并且在这些条件下存在辐照度过剩。另一方面，考虑到辐照度过剩的情况，评估了更长的光程（10cm）。结果表明，推荐使用超过 5cm 的光程，因为可以用更高的单位面积处理更多的废水，从而获得更高的处理速率。
