Egypt is a country with limited water resources. Egypt water needs are growing rapidly as a result of the population increase, climate change and development activities. The aim of the study is to analyse how Egypt can sustain its mega urban projects by utilizing greywater as a non-conventional water resource. A quantitative-based assessment has been conducted to investigate the overall evaluation of the greywater resources in Egypt. Greywater accounts for between 40 and 80% of the total water discharged from the house, and the total use of water for drinking and health use can be estimated at 10.4 billion cubic meters per year. The results show that the greywater resources may support a sustainable future of non-conventional water resources in a very positive way. Greywater can provide Egypt with about 4.15–8.30 billion cubic meters annually, which is a good support for water resources in Egypt. The paper concluded that greywater is an important resource to facilitate the success of the new mega urban projects. Egypt should maximize the share of greywater resources, especially in its new mega urban projects. Greywater resources can support Egypt and other arid and semiarid regions and countries in transition to a sustainable future.

埃及是一个水资源有限的国家。由于人口增加、气候变化和发展活动，埃及对水的需求正在迅速增长。该研究的目的是分析埃及如何通过利用灰水作为非常规水资源来维持其大型城市项目。已经进行了基于定量的评估，以调查埃及灰水资源的整体评估。中水占房屋总排放水量的40%至80%，估计每年用于饮用和卫生用水总量为104亿立方米。结果表明，灰水资源可能以非常积极的方式支持非常规水资源的可持续未来。灰水每年可为埃及提供约 4.15-83 亿立方米，这对埃及的水资源是一个很好的支持。该论文得出的结论是，中水是促进新的大型城市项目取得成功的重要资源。埃及应该最大限度地提高灰水资源的份额，特别是在其新的大型城市项目中。灰水资源可以支持埃及和其他干旱和半干旱地区和国家向可持续的未来过渡。