It is strategically important to optimize the pipe network used for reclaimed urban water reuse. A large and complex system model is developed, with the minimum total annual cost of the pumping station and pipe engineering as objective functions, the head loss in the divided pipe segment as the coupling constraint, the economic flow velocity and the optimal diameter of a standard pipe as feasible domain constraints, and the design head and diameter of the pipe as decision variables. The problem is solved by combining the ratio of the discrete enumeration of the design head to the decomposition-dynamic programming aggregation of the large-scale system. This strategy can solve the problem of the optimal pipe diameter in each section of the pipe network engineering under a fixed design head of the pressurized pumping station. On this basis, the annual cost of reclaimed water reuse pipe network engineering is compared under the different design heads of the pressurized pumping stations, allowing the optimal design scheme for reclaimed water reuse pipe network engineering to be obtained. At the same time, the optimal design head of the pressurized pumping station and the optimal pipe diameter of each section can be identified. This can provide a theoretical reference for the optimal design of urban and rural water pipe networks.

优化用于城市再生水回用的管网在战略上很重要。建立了一个大型而复杂的系统模型，以泵站和管道工程的年度总成本最低为目标函数，分开的管段中的压头损失为耦合约束，经济流速和标准的最佳直径管道作为可行的域约束，而管道的设计扬程和直径作为决策变量。通过将设计头的离散枚举与大型系统的分解动态编程集合的比率相结合，可以解决该问题。该策略可以解决增压泵站固定设计扬程下管网工程各段最佳管径的问题。在此基础上，在加压泵站的不同设计方案下，比较了中水回用管网工程的年度成本，从而获得了中水回用管网工程的最佳设计方案。同时，可以确定增压泵站的最佳设计扬程和每个部分的最佳管道直径。这可以为城乡水管网的优化设计提供理论参考。可以确定加压泵站的最佳设计扬程和每段的最佳管道直径。这可以为城乡水管网的优化设计提供理论参考。可以确定加压泵站的最佳设计扬程和每段的最佳管道直径。这可以为城乡水管网的优化设计提供理论参考。