Degradation of emergent contaminants by UV, UV/H₂O₂ and neutral photo-Fenton at pilot scale in a domestic wastewater treatment plant

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• 作者：N. De la Cruz ; L. Esquius ; D. Gr ; jean ; A. Magnet ; A. Tungler ; L.F. de Alencastro ; C. Pulgar¨ªn
• 关键词：Micropollutants ; Emergent contaminants ; Neutral photo-Fenton ; UV ; UV/H2O2 ; Pilot-scale ; Domestic wastewater decontamination ; Costs
• 刊名：Water Research
• 出版年：2013
• 出版时间：1 October, 2013
• 年：2013
• 卷：47
• 期：15
• 页码：5836-5845
• 全文大小：650 K

文摘

This study focuses on the removal of 22 selected micropollutants in an effluent from a municipal wastewater treatment plant (MWTP) at pilot scale. A reactor of 37?L with five low pressure mercury lamps emitting at 254?nm (UV₂₅₄) was used. The 22 micropollutants include 15 pharmaceuticals, 2 X-Ray contrast medias, 1 corrosion inhibitor and 4 biocides/pesticides. Five of these 22 compounds were used as indicative substances as proposed by the Swiss Federal Office for the Environment (FOEN) (carbamazepine, diclofenac, sulfamethoxazole, benzotriazole and mecoprop).

Treatments included UV₂₅₄ light alone, UV₂₅₄?+?H₂O₂ and UV₂₅₄?+?H₂O₂+Fe³⁺. Wastewater coming from the MWTP already contained iron with an average total iron of 1.6?mg?L^?1. Original pH was not modified and remained between 6 and 7. The parameters changed during the experiments to find the optimal conditions were: wastewater flow rate (2-14?m³?h^?1), H₂O₂ concentration (20-50?mg?L^?1) and Fe (III) concentration (0-4?mg?L^?1). Chemicals removal rates were greater than 80 % for the majority of the flow rates tested.

Operating costs for the different conditions evaluated were also estimated and compared.