Effect of coil diameter on water disinfection efficiency in a helical photoreactor using ultraviolet-C light emitting diodes.

IF 2.2 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Environmental Technology Pub Date : 2025-01-01 Epub Date: 2024-05-16 DOI:10.1080/09593330.2024.2354122

Chien-Ping Wang, Yu-Cheng Chang, Yung-Hsiang Lin, Qiang Jia

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Abstract

This study investigated the disinfection efficiency of a photoreactor equipped with a helical water flow channel and ultraviolet-C (UV-C) light emitting diodes (LEDs). Theoretical simulations and biodosimetry tests were conducted to investigate the effects of coil diameter and flow rate on the reactor's performance in inactivating Escherichia coli. The interplay between hydrodynamics and UV radiation was analyzed to determine the UV fluence absorbed by the microbes. The simulations revealed that, primarily due to the specific radiation pattern of the UV LEDs, the coil diameter strongly influenced the distribution of irradiance in the water and the UV fluence received by microbes. The experimental results indicated that the photoreactor achieved the highest inactivation value of 2.8 log when the coil diameter was 48 mm for a flow rate of 40 mL/min; this log value was superior to those for coil diameters of 16, 32, 64, and 80 mm by approximately 1.9, 0.4, 0.5, and 0.7 log units, respectively. This optimal coil diameter leading to the maximal UV irradiance and the highest degree of irradiance uniformity along the flow channel. This study offers design guidelines for constructing a high-efficiency water disinfection reactor with a helical flow channel configuration.

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使用紫外线-C 发光二极管的螺旋光反应器中线圈直径对水消毒效率的影响。

本研究调查了装有螺旋水流通道和紫外线-C（UV-C）发光二极管（LED）的光反应器的消毒效率。通过理论模拟和生物模拟试验，研究了线圈直径和流速对反应器灭活大肠杆菌性能的影响。分析了流体动力学和紫外线辐射之间的相互作用，以确定微生物吸收的紫外线流量。模拟结果表明，主要由于紫外线 LED 的特定辐射模式，线圈直径对水中的辐照度分布和微生物吸收的紫外线流量有很大影响。实验结果表明，在流量为 40 mL/min 时，当线圈直径为 48 mm 时，光反应器达到的灭活值最高，为 2.8 log；这一对数值比线圈直径为 16、32、64 和 80 mm 时分别高出约 1.9、0.4、0.5 和 0.7 log 单位。这种最佳线圈直径可使紫外线辐照度最大，流道沿线的辐照度均匀度最高。这项研究为建造螺旋流道结构的高效水消毒反应器提供了设计指南。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Environmental Technology 环境科学-环境科学

CiteScore

6.50

自引率

3.60%

发文量

审稿时长

4 months

期刊介绍： Environmental Technology is a leading journal for the rapid publication of science and technology papers on a wide range of topics in applied environmental studies, from environmental engineering to environmental biotechnology, the circular economy, municipal and industrial wastewater management, drinking-water treatment, air- and water-pollution control, solid-waste management, industrial hygiene and associated technologies. Environmental Technology is intended to provide rapid publication of new developments in environmental technology. The journal has an international readership with a broad scientific base. Contributions will be accepted from scientists and engineers in industry, government and universities. Accepted manuscripts are generally published within four months. Please note that Environmental Technology does not publish any review papers unless for a specified special issue which is decided by the Editor. Please do submit your review papers to our sister journal Environmental Technology Reviews at http://www.tandfonline.com/toc/tetr20/current