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. 2019 Nov 1;164:114959. doi: 10.1016/j.watres.2019.114959. Epub 2019 Aug 8.
The newly emerged microplasma UV radiating technology can be a viable alternative to conventional radiation sources for UV water treatment. The capability of the microplasma UV lamp to monochromatically irradiate various wavelengths with different pulsation frequencies in a flat form opens new pathways for the development of novel UV-based water purifiers. This study is the first to systematically examine the microplasma UV lamp and develop a robust experimental method and apparatus for its operation to study the kinetics of both microbial and chemical pollutant degradation. The microplasma UV lamp was characterized in terms of its radiation profile and the impact of operating parameters on the lamp radiant power output. It was shown to be an instant-on and fast stabilized source. The radiant power output was a linear function of the electrical current and was not influenced by the lamp operating temperature and intermittent on/off cycles. A protocol was developed for obtaining reliable kinetic data for UV-induced elimination of microorganisms and micropollutants. An experimental setup was proposed for the kinetic studies, where the characteristics of the incident irradiance of the lamp, including uniformity, collimation, and divergence, were quantitatively evaluated. In addition, the water factor (WF) for calculating the average fluence rate was redefined for both the transient and steady state conditions. This modification is essential to account for changes in the UV transmittance of the medium, which could be an important factor for kinetic study of chemical contaminants. Two studied cases of microbial direct inactivation and the chemical photo-initiated oxidation process in different setups, based on the developed protocol, confirmed the reproducibility of the fluence-based kinetic data independent of the reactor size. The proposed protocol can be applied to the kinetic study of the elimination of microbial and chemical contaminants using microplasma UV lamps of any size, power, and peak wavelength.
新兴的微等离子体紫外辐射技术可以作为传统紫外辐射源在水消毒处理方面的可行替代方案。微等离子体紫外灯以平面形式以不同的脉冲频率对各种波长进行单色辐照的能力为新型基于紫外的水净化器的开发开辟了新途径。本研究首次系统地研究了微等离子体紫外灯，并开发了一种强大的实验方法和装置，用于其操作，以研究微生物和化学污染物降解的动力学。该微等离子体紫外灯的辐射特性及其操作参数对灯辐射功率输出的影响进行了表征。结果表明，该灯是一种即时开启且快速稳定的光源。辐射功率输出与电流呈线性关系，不受灯工作温度和间歇开/关循环的影响。制定了一种可靠的获取微生物和微污染物紫外消除动力学数据的方案。提出了一种用于动力学研究的实验装置，对灯的入射辐照度特性（包括均匀性、准直性和发散性）进行了定量评估。此外，还重新定义了用于计算平均辐照度率的水因子（WF），以适应介质紫外透射率的变化，这对于化学污染物的动力学研究是一个重要因素。根据所开发的方案，在不同的装置中对微生物直接失活动力学和化学光引发氧化过程进行了两个研究案例，证实了基于剂量的动力学数据的重现性独立于反应器的尺寸。该方案可应用于微等离子体紫外灯的微生物和化学污染物消除动力学研究，微等离子体紫外灯的尺寸、功率和峰值波长均可不同。
