Effect of coupled UV-A and UV-C LEDs on both microbiological and chemical pollution of urban wastewaters

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• 作者：A.-C. Chevremont^a ; ^b ; ^{anne-celine.chevremont@imbe.fr} ; A.-M. Farnet^b ; B. Coulomb^a ; J.-L. Boudenne^a
• 关键词：Bacteria inactivation ; Coupled wavelengths ; Ultraviolet light-emitting diodes (UV-LED) ; Water recycling ; Photooxidation
• 刊名：Science of the Total Environment
• 出版年：2012
• 期刊代码：63_00489697
• 类别：env
• 出版时间：1 June, 2012
• 卷：426
• 期：Complete
• 页码：304-310
• 文件大小：1913 K

摘要

Wastewater reuse for irrigation is an interesting alternative for many Mediterranean countries suffering from water shortages. The development of new technologies for water recycling is a priority for these countries. In this study we test the efficiency of UV-LEDs (Ultraviolet-Light-Emitting Diodes) emitting UV-A or UV-C radiations, used alone or coupled, on bacterial and chemical indicators. We monitored the survival of fecal bioindicators found in urban wastewaters and the oxidation of creatinine and phenol which represent either conventional organic matter or the aromatic part of pollution respectively. It appears that coupling UV-A/UV-C i) achieves microbial reduction in wastewater more efficiently than when a UV-LED is used alone, and ii) oxidizes up to 37%of creatinine and phenol, a result comparable to that commonly obtained with photoreactants such as TiO₂.