Located in a semi-arid and arid zone, Iran is suffering from growing challenges of water scarcity. In the paradigm of a circular economy, the reuse of treated wastewater in agriculture is currently regarded as a possible solution for alleviating the issues of water scarcity and pollution. Accordingly, this research aims to assess the use of polluted water in the integrated management of water resources in Semnan. The research used the Water Evaluation and Planning System (WEAP) software package to model and analyze the water sector. Also, the Bayesian network method was used to assess the risk of using polluted water and its effects on humans and plants. The research explored two general scenarios for the study site of Semnan. The first scenario assumes the increase in population, crops (food), and industries, and the second has the same assumptions plus an increase in agricultural efficiency (food production). Based on the results, the agricultural, urban, and industrial water demands are 37, 0.06, and 0.01 million m³ in the base year, respectively. The water demand in the next years will be higher due to population growth. Finally, it is safer to use the wastewater of both treatment plants of the region (Mehdishahr and Semnan) in the industry than in other sectors. Additionally, the wastewater of the Mehdishahr Sewage Treatment Plant is more reliable than that of the Semnan Sewage Treatment Plant.

伊朗地处半干旱和干旱地区，水资源短缺的挑战日益严重。在循环经济的范式中，农业中处理过的废水的再利用目前被认为是缓解水资源短缺和污染问题的可能解决方案。因此，本研究旨在评估污染水在 Semnan 水资源综合管理中的使用情况。该研究使用水评估和规划系统 (WEAP) 软件包对水部门进行建模和分析。此外，贝叶斯网络方法被用于评估使用污染水的风险及其对人类和植物的影响。该研究探索了 Semnan 研究地点的两种一般情景。第一种情况假设人口、农作物（食品）和工业增加，第二个具有相同的假设加上农业效率（粮食生产）的提高。根据结果​​，农业、城市和工业用水需求分别为 37、0.06 和 0.01 万立方米基准年分别为^{3 个。}由于人口增长，未来几年的用水需求将会增加。最后，在工业中使用该地区两个处理厂（Mehdishahr 和 Semnan）的废水比在其他行业更安全。此外，Mehdishahr 污水处理厂的废水比 Semnan 污水处理厂的废水更可靠。