该项目评估了传统地表水处理厂下游的中压紫外线（UV）反应器（每天处理300万加仑[mgd]），以确定工艺设计和运行问题。结果表明，可以实现适当的消毒效果，但监测消毒效果很困难。在研究的整个水质范围内，异养细菌的灭活率始终达到3 log10以上。在生物剂量学挑战期间，MS-2大肠杆菌噬菌体的失活在反应堆lamp容量的75%时完成。然而，浊度的增加非常小- -从0.05到0.10 ntu——导致传感器读数下降34%。这种反应让人质疑现有传感器可靠监测紫外线性能的能力。利用直接测量紫外线辐照度的辐射计对紫外线传感器进行了检查，这一程序可能会改进大规模紫外线反应堆的监测程序。为了使紫外线剂量测量更方便操作员，有必要进一步描述水质对传感器性能的影响。包括11个参考文献、表格、图表。

This project evaluated a medium-pressure ultraviolet (UV) reactor (treating 3 million gallons per day [mgd]) downstream from a conventional surface water treatment plant to identify process design and operations issues. The results showed that adequatedisinfection could be achieved, but monitoring disinfection effectiveness was difficult. Across the water quality range studied, >3 log10 inactivation of heterotrophic bacteria was consistently achieved. During biodosimetry challenges, >2 log10 inactivation of MS-2 coliphage was accomplished at 75 percent of the reactor's lamp capacity. However, very small increases in turbidity--from 0.05 to 0.10 ntu--caused sensor readings to drop 34 percent. This response calls into question the ability of existing sensors to reliably monitor UV performance. UV sensors were checked against a radiometer that directly measured UV irradiance, a procedure that may improve monitoring procedures for large-scale UV reactors. To make UV dose measurement more operator-friendly, a further characterization of water quality effects on sensor performance is necessary. Includes 11 references, tables, figures.