Identifying the potential of areas prone to replacing wastewater to compensate for the drop in the level of underground water sources

Subject Areas : Groundwater

وحید یزدانی ¹ , محمد سلطانی اصل ²

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Received: 2022-08-16 Accepted : 2023-05-28 Published : 2023-08-30

Keywords: سیستم تحلیل سلسله مراتبی, دشت مشهد, Mashhad Plain, Hierarchical analysis system, Reservoir level drop, Wastewater replacement, افت سطح ایستابی, جایگزینی پساب,

Abstract :

One of the main strategies to combat water scarcity is the continuous use of water by the change in its quality in different sectors of consumption, thus reusing wastewater is an inevitable necessity. In this study, the groundwater quality parameters of Mashhad Plain were investigated spatially and temporally using normal kriging and point cokriging methods in GIS environment. In the following, by using the hierarchical analysis process of AHP, the areas prone to replacing treated industrial effluents in the Mashhad plain have been identified and prioritized. Based on the statistics and standards used, it was determined that only 12.5% ​​of the total underground water of the plain is potable. Also, 70% of the total underground water in Mashhad plain is suitable for agriculture. AHP results showed that according to the opinions of experts and water specialists, the drop in water level and underground water quality of Mashhad plain had the highest weighting coefficient, and the distance from the treatment plant and the height difference of different areas compared to the treatment plant (topography) had the lowest weighting coefficient. Also, the areas that had the highest drop, the best water quality, the least distance, and lower height from the treatment plant, had the highest weighting factor, and naturally, the areas that had the lowest drop, the worst water quality, the greatest distance and height from the treatment plant, had the lowest weighting factor Had the areas that were identified as the priority had the highest drop in water level and terms of water quality, they had better quality than other areas of the plain, and since in the AHP method, the highest weighting factor was related to the drop in water level and the quality of underground water. Also, the highest amount of this coefficient was related to the areas that had the highest drop and the best water quality, so they were chosen as the priority areas for replacing treated wastewater. By replacing treated wastewater with water from agricultural wells and removing them from the exploitation circuit, the amount of withdrawal from the aquifer is reduced and its stored potential can be used in the future. Replacement due to the high depth of the saturated layer in the plain prevents the change of the aquifer quality. On the other hand, the hydraulic gradient of the aquifer decreases the slope of the water level and, as a result, the speed of the underground water flow decreases. By direct replacement (compensation) and removing the agricultural wells from the circuit, 100% of the replaced water with better quality is stored in the underground water table, and will be used in the future.

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