本文件提供了水回用处理系统的生命周期成本（LCC）方法，用于初始规划和后期性能评估。LCC分析提供了有效的信息，以确定目标是否实际实现，以及如何改进和优化运营。LCC评估中还考虑了环境影响。

This document provides life-cycle cost (LCC) methodology for treatment systems for water reuse for initial planning as well as later performance evaluation. LCC analysis provides valid information to determine whether the objectives have actually been accomplished and how operations are improved and optimized. Environmental impact is also taken into account in the LCC evaluation.