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| Simulation of Salt Ion Migration in Soil Under Reclaimed Water Irrigation |
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| KeyWord:reclaimed water irrigation；Hydrus-1D；salt ion migration；groundwater pollution |
| Author Name | Affiliation | | YE Wen | College of Water Sciences, Beijing Normal University, Beijing 100875，China | | WANG Hui-xiao | College of Water Sciences, Beijing Normal University, Beijing 100875，China | | GAO Jun | College of Water Sciences, Beijing Normal University, Beijing 100875，China | | LIU Hai-jun | College of Water Sciences, Beijing Normal University, Beijing 100875，China | | LI Yan | College of Water Resources & Civil Engineering, China Agricultural University, Beijing 100083，China |
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| Abstract: |
| Reclaimed water has gradually become one of the main water sources for agricultural irrigation in the Northern China. Though treated, it may still contain heavy metals, salt ions and organic pollutants, and thus pose potential soil and groundwater pollution. Here, unsaturated soil water and solute movement model Hydrus-1D was used to simulate the vertical distributions of major nutrient ions SO2-4, Cl-, and NO-3 in soil profile over time, in order to understand the potential risk to the underground water. Salts in the current reclaimed water were not high enough to migrate into or pollute the underground water, but were adsorbed and accumulated in soil over time at the Xinhe irrigation district of Tongzhou county. The salt ions were mainly concentrated at the surface soil layer less than 50 cm. Our data show that reclaimed water was safe for agricultural irrigation. In order to prevent the secondary salinization of surface soils, however, high frequent flooding irrigation of reclaimed water should not be allowed, but alternate irrigation of reclaimed water and well water would be recommended. |
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