Degradation of 32 emergent contaminants by UV and neutral photo-fenton in domestic wastewater effluent previously treated by activated sludge

流出物 化学 环境化学 废水 降级(电信) 溶解有机碳 污染 污水处理 有机质 杀生物剂 活性污泥 过氧化氢 制浆造纸工业 环境工程 环境科学 有机化学 电信 生物 计算机科学 工程类 生态学
作者
N. De la Cruz,Jaime Giménez,Santiago Esplugás,Dominique Grandjean,Luis Felippe de Alencastro,C. Pulgarín
出处
期刊:Water Research [Elsevier BV]
卷期号:46 (6): 1947-1957 被引量:456
标识
DOI:10.1016/j.watres.2012.01.014
摘要

This study focuses on the removal of 32 selected micropollutants (pharmaceuticals, corrosion inhibitors and biocides/pesticides) found in an effluent coming from a municipal wastewater treatment plant (MWTP) based on activated sludge. Dissolved organic matter was present, with an initial total organic carbon of 15.9 mg L−1, and a real global quantity of micropollutants of 29.5 μg L−1. The treatments tested on the micropollutants removal were: UV-light emitting at 254 nm (UV254) alone, dark Fenton (Fe2+,3+/H2O2) and photo-Fenton (Fe2+,3+/H2O2/light). Different irradiation sources were used for the photo-Fenton experiences: UV254 and simulated sunlight. Iron and H2O2 concentrations were also changed in photo-Fenton experiences in order to evaluate its influence on the degradation. All the experiments were developed at natural pH, near neutral. Photo-Fenton treatments employing UV254, 50 mg L−1 of H2O2, with and without adding iron (5 mg L−1 of Fe2+ added or 1.48 mg L−1 of total iron already present) gave the best results. Global percentages of micropollutants removal achieved were 98 and a 97% respectively, after 30 min of treatments. As the H2O2 concentration increased (10, 25 and 50 mg L−1), best degradations were observed. UV254, Fenton, and photo-Fenton under simulated sunlight gave less promising results with lower percentages of removal. The highlight of this paper is to point out the possibility of the micropollutants degradation in spite the presence of DOM in much higher concentrations.
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