随着美国环境保护局（USEPA）紫外线消毒指导手册的最终确定，公用事业 面对评估相对利益和挑战的复杂过程 与紫外线消毒有关。这些问题包括灯套 污垢，在给定位置发生的概率，以及各种 清除污垢的方法。在这项研究中，长期污垢为中压 对使用仅机械研磨套筒清洗系统的反应器进行了检查。 一个四灯中压紫外线消毒反应器运行了15个月 处理加州混合废水的常规水处理厂下游 州项目用水（SPW）和科罗拉多河水（CRW）。 紫外线照射前 消毒后，水由一个传统的处理厂处理，该处理厂包括 原水臭氧氧化、混凝、絮凝、沉淀和生物活性， 无烟煤砂过滤。在此期间，紫外线套筒清洁系统 活性，并定期记录水化学条件。之后 从反应器中取出，测量了套筒紫外透射率的空间分布 灯套外部污垢的特征、组成和数量 确定了材料。 发现了明显的外部和内部套管污垢。内部 污染物被证实含有相对较高浓度的钙， 四个套筒中的两个套筒中含有镁、硫和磷。 袖套紫外线 测量结果表明，透射率从92%降低到了92%（通常用于清洁环境） 在某些位置，石英套管）的含量低于10%。在移除两个 室内和室外污染物中，UVT仍然较低，表明污染物浓度永久性降低 套筒UVT，可能通过石英日晒。同时灯套外部污垢 通常取决于水的化学性质和操作条件，套筒内部污垢 可能会受到不同问题的影响，例如灯具材料、灯具处理 安装过程中的套管，以及套管的方向（垂直与水平） 在使用过程中。建立了一个矿物饱和度指数模型来研究 水氧化还原电位的变化对污垢的可能影响。 包括9个参考文献、表格、图表。

With the finalization of U.S. Environmental Protection Agency's (USEPA's) Ultraviolet Disinfection Guidance Manual, utilities face the complex process of evaluating the relative benefits and challenges associated with ultraviolet (UV) disinfection. Among these issues are lamp sleeve fouling, its probability of occurring at a given location, and the efficacy of various foulant removal methods. In this study, long term fouling for a medium pressure reactor utilizing a mechanical-only abrasive sleeve cleaning system was examined. A 4-lamp, medium-pressure UV disinfection reactor was operated for 15 months downstream of a conventional water treatment plant treating a blend of California State Project water (SPW) and Colorado River water (CRW). Prior to UV disinfection, the water was treated by a conventional treatment plant consisting of raw-water ozonation, coagulation, flocculation, sedimentation, and biologically-active, anthracite-sand filtration. During this time the UV sleeve cleaning system was active and water chemistry conditions were periodically recorded. After removal from the reactor, spatial distribution of sleeve UV transmittance was characterized and composition and quantity of lamp sleeve exterior fouling materials were identified. Significant exterior, and interior, sleeve fouling was discovered. The interior foulant was confirmed to consist of relatively high concentrations of calcium, magnesium, sulfur, and phosphorus in two of the four sleeves. Sleeve UVT measurements identified a reduction in transmittance from 92% (typical for clean quartz sleeves) to less than 10% in some locations. After removal of both the interior and exterior foulants, UVT was still low, indicating a permanent reduction in sleeve UVT, perhaps by quartz solarization. While lamp sleeve exterior fouling often depends on water chemistry and operating conditions, sleeve interior fouling may be influenced by different issues, such as lamp materials, handling of lamps and sleeves during installation, and orientation (vertical vs. horizontal) of sleeves during use. A mineral saturation index model was created to investigate the possible impact on fouling of changes in water oxidation reduction potential. Includes 9 references, tables, figures.