SIMULATION OF RESTORATION OF GROUNDWATER POLLUTION IN A LANDFILL IN COASTAL PLAIN AREA

NIU Yi; LI Wei; LI Gongke; WANG Weixing; LI Mingming; CAO Shuping; LÜ Xiaowen

doi:10.13205/j.hjgc.202303002

Volume 41 Issue 3

Mar. 2023

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2023 > 41(3): 12-20

NIU Yi, LI Wei, LI Gongke, WANG Weixing, LI Mingming, CAO Shuping, LÜ Xiaowen. SIMULATION OF RESTORATION OF GROUNDWATER POLLUTION IN A LANDFILL IN COASTAL PLAIN AREA[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(3): 12-20. doi: 10.13205/j.hjgc.202303002

Citation:

NIU Yi, LI Wei, LI Gongke, WANG Weixing, LI Mingming, CAO Shuping, LÜ Xiaowen. SIMULATION OF RESTORATION OF GROUNDWATER POLLUTION IN A LANDFILL IN COASTAL PLAIN AREA[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(3): 12-20. doi: 10.13205/j.hjgc.202303002

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SIMULATION OF RESTORATION OF GROUNDWATER POLLUTION IN A LANDFILL IN COASTAL PLAIN AREA

doi: 10.13205/j.hjgc.202303002

1. Tianjin Monitoring Central Station of Geological Environment, Tianjin 300191, China;
2. Tianjin Eco-Environmental Monitoring Center, Tianjin 300000, China;
3. Tianjin Institute of Geological Survey, Tianjin 300191, China

Received Date: 2021-12-21
Available Online: 2023-05-26
Publish Date: 2023-03-01

Abstract

Abstract

Leachate is the main pollution source for groundwater in landfill areas. In this paper, a landfill in a coastal plain area was studied. The migration and remediation of pollutants in groundwater were simulated based on MODFLOW/MT3D modules. The studied working conditions included continuous pollution, cleaned pollution sources and supported pumping wells, and then we simulated the migration and diffusion characteristics of permanganate index in shallow groundwater. The simulation results showed that because of the very small permeability coefficient and the poor hydrodynamic conditions of shallow groundwater aquifers in the coastal plain area, the pollutants mainly affected two aquifers with a depth of less than 10 m; continuous leakage would result in a high content of pollutants in the groundwater plume, but the migration and diffusion distance of pollutants outside the site would be very limited, and after 20 years, the migration distance of pollutants beyond the site boundary would be less than 70 m; setting pumping wells can clean up pollutants effectively, but the groundwater plume removal speed would be very slow, and it would take 5 to 10 years of continuous pumping to shrink the groundwater plume into the site boundary. In the actual repair, the operation and layout of pumping wells can be adjusted according to the repair progress, the pumping wells in the repaired area can be closed, the water yield in the pollution centre can be increased, and pumping wells can be added in the sections with high pollutant concentration to speed up the pollution repair. The simulation model of pollutant transport and remediation established in this study can be used as a reference for the investigation and assessment of the groundwater environment and pollution control in other similar landfill sites.
- landfill,
- coastal plain,
- groundwater,
- numerical simulation,
- pollution remediation

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References(25)

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