Abstract
GMS was used to simulate the groundwater pollution status during the operation period of a coastal polyurethane factory. Based on the geological and hydraulic data, the groundwater flow field model and solute transport model were established using the MODFLOW and MT3DMS module respectively by which the potential area and concentration of pollutant were predicted and the extent of groundwater pollution in the study area was evaluated. The simulation and prediction results showed that under abnormal conditions, the groundwater environment would be affected. As the characteristic pollutants, COD and ethylene glycol mainly migrated along the direction of water flow and exceeded the standard for a certain period of time. The migration distance and pollution range of contaminants expanded with time, and the peak concentration decreased with the increase of diffusion distance. After 50 years, the potential pollution area of COD and ethylene glycol would reach 225651.2m2 and 210947.5m2 respectively. During the migration process, the concentration of pollutants in the groundwater gradually recovered to the background value, and the over-standard area was reduced to zero. The comprehensive prediction model and risk assessment method of this study can help to formulate practical prevention and control measures for the protection of groundwater environment.
Highlights
With the rapid development of chemical, pharmaceutical, pesticide and other industries in the coastal areas, the pollution problems caused by overexploitation have become increasingly prominent, especially for the pollution of groundwater environment, which is concealed, hysteretic and difficult to remove
The hydrogeological conceptual model was established based on the analysis of the groundwater flow characteristics, aquifer system structure and boundary conditions according to the literature and on-site hydrogeological environment survey results in the study area; The groundwater flow model was constructed by spatial dispersion, assignment of hydrogeological parameters, and verification of groundwater flow field; Reasonable pollution factors and groundwater leakage scenarios were selected and designed according to the characteristics of pollution sources
The groundwater flow numerical model was coupled with the pollutant migration equation to obtain the groundwater solute transport model, which was used to analyze the effects of pollutants on groundwater under abnormal conditions and predict the temporal and spatial migration of pollutants
Summary
With the rapid development of chemical, pharmaceutical, pesticide and other industries in the coastal areas, the pollution problems caused by overexploitation have become increasingly prominent, especially for the pollution of groundwater environment, which is concealed, hysteretic and difficult to remove. Studies on groundwater environment evaluation in the coastal area are very limited presently, which makes it a difficult point in the project environmental assessment. GMS was used to simulate the groundwater pollution situation during the operation period of the polyurethane plant. The groundwater flow field model established by MODFLOW module was combined with the solute transport model established by MT3DMS module to predict the potential area and concentration of pollutant migration.
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