“…High concentrations of heavy metals reflect the high subsoil EC, which was affirmed by the geophysical technique applied at the dumpsite. This is because the presence of heavy metal in water and dissolved salts usually result in high EC readings [ 4 ]. Fig.…”
“…High concentrations of heavy metals reflect the high subsoil EC, which was affirmed by the geophysical technique applied at the dumpsite. This is because the presence of heavy metal in water and dissolved salts usually result in high EC readings [ 4 ]. Fig.…”
“…Governing equations for the flow model (MODFLOW) and the modular three‐dimensional transport model (MT3D) were described in detail elsewhere (Zheng and Wang, 1999; Harbaugh, 2005; Ahmed et al ., 2019). To investigate the impacts of pumping rates on pollutant transportation, three rates namely 10 000, 30 000 and 60 000 m 3 /day were applied for the extracting well, B2.…”
This study examined the feasibility of tertiary treatment for the effluent of the wastewater treatment plants through filtration into soil layers and pumping it for reuse. The research adopted experimental measurements and modelling works to simulate treating wastewater effluents by surrounding soil layers. The modelling work investigated the suitable distances for wastewater purifications into different types of soil. The work also studied a novel method by adding treating artificial layers around the extracting well such as active carbon, sawdust and fine sand layers to increase treatment efficiency. The results of simulation model exhibited that the most of pollutant concentrations can be removed by soil filtration after a short horizontal distance about 20 m away from the pollution source. The model portrayed also very well the importance of the proposed approach of using artificial materials around the extracting well as the approach results showed high removal efficiency reached 100%. The results showed generally that using this treatment technique generated relatively high‐quality water suitable for many applications such as irrigation.
“…Hydraulic conductivity (K) mainly affects the contaminant fate and transport [25]. Ahmed et al [26] established a three-dimensional simulation model by combining modular finite-difference flow model and the modular three-dimensional transport model, which was applied to the leachate collection site to elucidate the fate and migration of the leachate from collection site bed into the groundwater. Results showed a good match between numerical model results and experimental measurements.…”
The migration of groundwater flow and contaminants in fractured medium is complicated owing to the strong heterogeneity and anisotropy of fractured rock mass. Taking the environmental restoration and groundwater protection of the Lishui domestic waste landfill in Nanjing as the background, the groundwater environmental impact assessment and prediction are conducted for the groundwater environmental pollution that may be caused by the leakage of the landfill leachate after the closure of the domestic waste landfill. The strata of the landfill site are clay-cobble gravel, strongly and moderately weathered breccia, with obvious anisotropy and significant differences in rock mass permeability. A 3D numerical model of groundwater flow and contaminant migration in the landfill area is established by integrating the hydrogeological field tests and a conceptual model in the study area. Based on the parametric inversion method, the heterogeneous anisotropic permeability coefficient of the fractured medium is calibrated, and the temporal and spatial migration characteristics of contaminants such as ammonia nitrogen and mercury are predicted using the corrected model under the normal and failure conditions of the antiseepage curtain. The calculated results show that when the antiseepage fails, the maximum migration distances of contaminants in the horizontal direction after 100 days in the old and new landfills are 7.66 m and 15.64 m, respectively, and the maximum migration distances after 20 years are 192.5 m and 113.89 m, respectively. The migration direction and distances of contaminants are consistent with the hydrogeological conditions of the study area. The model calculation results provide a corresponding basis for the antiseepage control of contaminants.
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