Development of water treatment devices using UV light emitting diodes (UV-LEDs)

发光二极管（LED）作为一种创新的无汞光源越来越普遍，并且发射杀菌紫外光（UV-LED）的LED最近已经商业化。为了将新技术应用于水处理系统，对UV-LED反应器设计的研究尤为重要。本研究的挑战是开发一个原型的批处理和流通的水消毒系统，含有紫外线发光二极管，并检查大肠杆菌和大肠杆菌噬菌体Qbeta的消毒效率。这项研究表明，具有265 nm和280 nm峰值发射的UV-LED对水消毒是有效的，并且如何管理废热是设计该设备的重要因素。此外，它表明，目标水的流体动力学条件是特别重要的流通水消毒装置。该研究为UV-LED在水处理中的未来应用提供了关键启示。

Light Emitting Diodes (LEDs) are getting more common as an innovative mercury-free light source, and LEDs emitting germicidal ultraviolet light (UV-LEDs) have become commercially available recently. To apply the new technology to water treatment systems, studies on the design of UV-LED reactors are particularly important. The challenges of this study were to develop a prototype of batch and flow-through water disinfection systems containing UV-LEDs and to examine the disinfection efficiencies for Escherichia coli and coliphage Qbeta. This study indicated that UV-LEDs with peak emissions at 265 nm and 280 nm are effective to disinfect water, and how to manage waste heat is an important factor at designing the device. Moreover, it was shown that the hydrodynamic conditions of target water is particularly important for flow-through water disinfection devices. This study provided key implications for the future application of UV-LEDs to water treatment.