Obtaining the effect of sewage network on groundwater quality using MT3DMS code: Case study on Bojnourd plain
2020
Kheirandish, Mahsa | Raḥīmī, Ḥamīd Riz̤ā | Kamaliardakani, Mojtaba | Rejā, Selima
Groundwater contamination is a significant problem related strongly to both the protection of the environment and the need for water. In the present study, groundwater quality was investigated in the Bojnourd watershed. The Bojnourd watershed is located in the northeast of Iran, which covers 65.5 km² of the North Khorasan province area. There are 11 extracting wells in the region. Annual water extraction from the alluvial aquifer in the area is used for agriculture, drinking, sanitary and industrial consumptions. In this research, groundwater quantity modeling, including calibration and verification by GMS software, had been performed. In the quality modeling stage, pollution contours for Electrical conductivity were mapped and analyzed by MT3DMS. The spread of salinity pollutants in the aquifer was predicted for 15 years by MT3DMS, which is a 3D modular software for advection, dispersion, molecular diffusion, chemical reaction, and solute absorption simulation. The purpose of this research is to simulate the electrical conductivity (EC) on the catchment and to predict the future trends of EC changes with MT3DMS software. Therefore, in this study, we generated two different scenarios in this model. Assuming current situations and simulating TDS, as the first scenario, and implementing municipal sewage systems on the whole city, as the second scenario, for 15 years. The results showed that the discharge of solid waste in the landfill site and domestic wastewater would severely affect the groundwater quality while implementing the municipal sewage system will improve the quality of groundwater significantly in the period of 15 years.
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