Abstract
Contaminant transport in subsurface water is the major pathway for contamination spread from contaminated sites to groundwater supplies, to remediate a contaminated site. The aim of this paper was to set up the groundwater contaminant transport model for the Wang-Tien landfill site, in southwestern Taiwan, which exhibits high contamination of soil and groundwater and therefore represents a potential threat for the adjacent Hsu-Hsian Creek. Groundwater Modeling System software, which is the most sophisticated groundwater modeling tool available today, was used to numerically model groundwater flow and contaminant transport. In the simulation, the total mass of pollutants in the aquifer increased by an average of 72% (65% for ammonium nitrogen and 79% for chloride) after 10 years. The simulation produced a plume of contaminated groundwater that extends 80 m in length and 20 m in depth northeastward from the landfill site. Although the results show that the concentrations of ammonium nitrogen and chlorides in most parts are low, they are 3.84 and 467 mg/L, respectively, in the adjacent Hsu-Hsian Creek.
Highlights
Landfills will cause lots environmental pollution, such as smells in the air, landfill gas combustion, and wastewater leakage
Results and Discussion one year groundwater flow model according to varying hydraulic heads with the monthly In order to obtain the simulation result in line with the in-situ conditions, we defined the one measurement data from
There are more 12 serial simulations indicating the groundwater flow year groundwater flow model according to varying hydraulic heads with the monthly measurement situation for each month in this model, and the groundwater flow of those serial simulations is data from 2013.viaThere are 12 failing serial simulations indicating groundwater situation for each continuously repeatedly the calibration process. the the flow one year groundwater month in thiswas model, and and the groundwater flow of and those serialthe simulations is continuously via flow model recorded it can use to simulate predict contaminant transport in this repeatedly failing the calibration process
Summary
Landfills will cause lots environmental pollution, such as smells in the air, landfill gas combustion, and wastewater leakage. A large number of landfill-caused groundwater pollution cases have been reported around the world The contaminants of municipal solid waste derived from landfill leaks into groundwater aquifers because of rainfalls, and by groundwater flow they spread into the adjacent river system and pollute the ecosystem. This mechanism does not stop even after landfills have stopped receiving waste. It is necessary to keep investigating and monitoring the surroundings of decommissioned landfill sites
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