本文总结了在亨德森市水回收设施（WRF）进行的紫外线（UV）替代调查和试点研究的结果。WRF是拉斯维加斯山谷的一个主要废水处理设施，正在从每天2000万加仑（mgd）扩建至每天35 mgd。作为工厂扩建设计的一部分，对三种不同类型的紫外线设备进行了研究和评估。三种类型的紫外线设备分别为低压/低强度、低压/高强度和中压/高强度。对这三个系统的评估包括经济和非经济两个方面- 本文介绍的经济因素。本文概述了WRF，包括背景信息和补充除磷装置组件。描述了经处理的废水排放方案，包括表面排放至拉斯维加斯冲洗区或排放至再生水用途，以及两种排放方案的既定处理标准。本文介绍了评估的各种紫外线系统，并将紫外线系统选择过程中研究的几个相关系统特性制成表格。两个备用系统的当前建设成本和运行维护成本以表格和图形形式呈现。 在选定特定紫外线系统后，进行了准直光束研究和先导试验，以验证亨德森WRF在实际操作条件下的设备性能。本文介绍了准直束研究和中试的结果，包括确定达到预期消毒效果所需的紫外线剂量，以及确定WRF处理废水的透射范围。准直光束研究和初步试验结果以图形方式进行了比较，显示了各种紫外线剂量导致的粪便大肠菌群浓度。最后，包括完整紫外线消毒池设计的平面图，以展示整个设计的范围- 规模化设施。本文包括亨德森市WRF扩建项目团队为确定合适的紫外线系统/技术以满足该市苛刻的消毒要求而进行的选择过程的信息性案例。包括数字。

This paper summarizes the results of the Ultraviolet (UV) alternative investigation and pilot study conducted at the City of Henderson Water Reclamation Facility (WRF). The WRF is a major wastewater treatment facility in the Las Vegas Valley that is being expanded from 20 million gallons per day (mgd) to 35 mgd. As part of the design for the plant expansion, three different types of UV equipment were researched and evaluated. The three types of UV equipment were low-pressure/low intensity, low pressure/high intensity, and medium pressure/high intensity. The evaluation of the three systems included economic and non-economic factors, which are presented in this paper. The paper provides a general overview of the WRF, including background information and supplemental phosphorous removal plant components. Treated effluent discharge options, consisting of surface discharge to the Las Vegas Wash or discharge for reclaimed water use, is described, as are established treatment standards for the two discharge options. The paper presents the various UV systems evaluated, and tabulates several pertinent system characteristics that were investigated during the UV system selection process. Present worth construction and operation and maintenance costs for two alternate systems are presented in tabular and graphic form. A collimated beam study and pilot test were conducted after a specific UV system was selected, to verify equipment performance under actual operating conditions at the Henderson WRF. Results of the collimated beam study and pilot test are presented, including determination of the UV dose required to achieve the desired disinfection results, and determination of the transmittance range of the WRF treated effluent. Collimated beam study and pilot test results are compared graphically, showing fecal coliform concentrations resulting from various UV doses. In closing, a plan view of the completed UV disinfection basin design is included to demonstrate the scope of the full-scale facility. This paper includes an informative case history of the selection process conducted by the City of Henderson WRF Expansion project team to determine the appropriate UV system/technology to comply with the City's demanding disinfection requirements. Includes figures.