The importance of system configuration for distributed direct potable water reuse
The importance of system configuration for distributed direct potable water reuse
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DOI：
10.1038/s41893-020-0518-5
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发表时间：
2020-04-27
影响因子：
27.6
通讯作者：
Li, Qilin
中科院分区：
文献类型：
--
作者：
Liu, Lu;Lopez, Evan;Li, Qilin
全球供水和污水处理基础设施面临着前所未有的挑战。一种新模型可以评估混合供水系统的环境和经济影响，该系统提供集中式地表水供应和城市废水的分布式直接饮用水再利用。全球的水和废水基础设施面临着前所未有的需求和供应冲突，需要非常规的解决方案。在这项研究中，我们开发了一种新颖的建模框架来评估混合供水系统的环境和经济影响，该系统通过城市废水的分布式直接饮用水回用（DPR）补充集中式地表水供应，作为应对此类挑战的策略。该模型使用德克萨斯州休斯顿市的真实供水和废水系统数据进行了测试。结果表明，以分布式DPR补充传统的集中供水可以减少饮用水管网的水龄，从而改善水质；即使用于废水深度处理的现有技术能耗较高，正确设计的系统配置也能实现全系统的净节能。确定了未来先进处理技术的目标能源效率，以实现所有混合系统配置的净节能。此外，与其他非常规供水解决方案相比，分布式 DPR 仍然具有财务竞争力。本研究开发的建模框架和相关数据库满足了定量表征分布式和混合水系统的重要研究需求，为综合城市水系统的合理设计奠定了必要的基础。
Water and wastewater infrastructure worldwide faces unprecedented challenges. A new model can assess the environmental and economic implications of a hybrid water supply system that provides a centralized surface water supply with distributed direct potable reuse of municipal wastewater.Water and wastewater infrastructure worldwide faces unprecedented demand and supply conflicts that require unconventional solutions. In this study, we develop a novel modelling framework to assess the environmental and economic implications of a hybrid water supply system that supplements a centralized surface water supply with distributed direct potable reuse (DPR) of municipal wastewater, as a strategy to address such challenges. The model is tested with real water and wastewater systems data from the City of Houston, Texas. Results show that supplementing the conventional centralized water supply with distributed DPR would reduce water age in the drinking-water distribution network and hence improve water quality; properly designed system configurations attain system-wide net energy savings even with the high energy consumption of existing technologies used for advanced treatment of the wastewater. A target energy efficiency for future advanced treatment technologies is identified to achieve net energy saving with all hybrid system configurations. Furthermore, distributed DPR remains financially competitive compared with other unconventional water supply solutions. The modelling framework and associated databases developed in this study serve an important research need for quantitatively characterizing distributed and hybrid water systems, laying the necessary foundation for rational design of integrated urban water systems.