Department of Chemical and Biological Engineering, The University of British Columbia, 2360 East Mall, Vancouver, BC V6T 1Z3, Canada.
Department of Chemical and Biological Engineering, The University of British Columbia, 2360 East Mall, Vancouver, BC V6T 1Z3, Canada.
Water Res. 2017 Oct 1;122:570-579. doi: 10.1016/j.watres.2017.06.015. Epub 2017 Jun 6.
Tremendous improvements in semiconductor technology have made ultraviolet light-emitting diodes (UV-LEDs) a viable alternative to conventional UV sources for water treatment. A robust and validated experimental protocol for studying the kinetics of microorganism inactivation is key to the further development of UV-LEDs for water treatment. This study proposes a protocol to operate UV-LEDs and control their output as a polychromatic radiation source. In order to systematically develop this protocol, the results of spectral power distribution, radiation profile, and radiant power measurements of a variety of UV-LEDs are presented. A wide range of UV-LEDs was selected for this study, covering various UVA, UVB, and UVC wavelengths, viewing angles from 3.5° to 135°, and a variety of output powers. The effects of operational conditions and measurement techniques were investigated on these UV-LEDs using a specially designed and fabricated setup. Operating conditions, such as the UV-LED electrical current and solder temperature, were found to significantly affect the power and peak wavelength output. The measurement techniques and equipment, including the detector size, detector distance from the UV-LED, and potential reflection from the environment, were shown to influence the results for many of the UV-LEDs. The results obtained from these studies were analyzed and applied to the development of a protocol for UV-LED characterization. This protocol is presented as a guideline that allows the operation and control of UV-LEDs in any structure, as well as accurately measuring the UV-LED output. Such information is essential for performing a reliable UV-LED assessment for the inactivation of microorganisms and for obtaining precise kinetic data.
半导体技术的巨大进步使得紫外发光二极管（UV-LED）成为水处理中传统紫外光源的可行替代品。建立一个用于研究微生物失活动力学的稳健且经过验证的实验方案是 UV-LED 在水处理领域进一步发展的关键。本研究提出了一种操作 UV-LED 并将其输出控制为多色辐射源的方案。为了系统地开发此方案，展示了各种 UV-LED 的光谱功率分布、辐射分布和辐射功率测量结果。为了进行这项研究，选择了各种不同的 UV-LED，涵盖了各种 UVA、UVB 和 UVC 波长、3.5°至 135°的视角以及各种输出功率。使用专门设计和制造的装置研究了这些 UV-LED 的操作条件和测量技术的影响。发现操作条件（例如 UV-LED 电流和焊点温度）会显著影响功率和峰值波长输出。测量技术和设备（包括探测器尺寸、探测器与 UV-LED 的距离以及环境中的潜在反射）会影响许多 UV-LED 的结果。对这些研究结果进行了分析，并应用于 UV-LED 特性描述协议的开发。该协议作为一个指南，允许在任何结构中操作和控制 UV-LED，并准确测量 UV-LED 的输出。这些信息对于进行微生物灭活的可靠 UV-LED 评估以及获得精确的动力学数据至关重要。
