本幻灯片演示概述了长滩水务部采用双级纳滤工艺进行海水淡化的新方法，如AwwaRF定制协作#3005中所述。该演示文稿概述了该项目的几个方面的信息，包括:背景；理论基础；操作优化；混合策略；病毒挑战；总结/结论；接下来的步骤。

This slide presentation outlines a new approach to seawater desalination using a dual-staged nanofiltration process at the Long Beach Water Department as presented in AwwaRF Tailored Collaboration #3005. The presentation outlines information on several aspects of the project including: background; theoretical basis; operational optimization; blending strategies; viral challenge; summary/conclusions; and, next steps.