Abstract: The environmental risk of groundwater in landfills has become increasingly prominent, which requires targeted control and remediation strategies. In this study, a landfill site in South China was taken as an example. According to the zoning collaborative control and repair of pollution source control area, groundwater treatment area and groundwater prevention and control area, the control strategy of pollution source reduction, leakage path obstruction, groundwater remediation and monitoring natural attenuation was proposed. The results showed that after six months operation of the leachate drainage system, the liquid level in front of the dam decreased by 3.2-3.4 m, effectively reducing the pollution source. After grouting the dam abutment, the permeability coefficient decreased to 8.10×10-7-8.91×10-6 cm/s, blocking the diffusion pathway of leachate. After three months operation of the groundwater extraction treatment system, the removal rates of ammonia nitrogen and chemical oxygen demand downstream of the waste dam were 77.3%-82.0% and 75.8%-78.1%, respectively. After the completion of groundwater extraction treatment, the groundwater circulation well system operated for three months, and the removal efficiency of ammonia nitrogen and chemical oxygen demand increased by 10.4-16.8 percentage points and 9.5-12.5 percentage points, respectively. Through hydraulic control and natural attenuation monitoring, the pollution plume has been effectively intercepted and the pollutant concentration continuing to decline.

Key words: landfill, zoning governance, reduction of pollution sources, leakage path obstruction, groundwater circulating well