Numerical simulation of pollutant transport in soils surrounding subway infrastructure.

Environ Sci Pollut Res Int

Department of Environmental Engineering, Beijing Institute of Petrochemical Technology, Beijing, 102617, People's Republic of China.

Published: March 2018

AI Article Synopsis

  • Public transport infrastructure, like subways, is increasingly being built in former industrial areas, raising concerns about the transfer of pollutants like arsenic into these environments.
  • The study simulated how arsenic moves through contaminated soil, revealing that it spreads from higher to lower concentrations, particularly noticeable early on, and ultimately becomes uniform after about 400 days.
  • Results indicated that the rate at which pollutants supply affects how far they diffuse, and utilizing a diaphragm wall of certain depth can effectively control this diffusion, providing valuable insights for environmental assessments and engineering decisions in affected urban areas.

Article Abstract

With continued urbanization, public transport infrastructure, e.g., subways, is expected to be built in historically industrial areas. To minimize the transfer of volatile organic compounds and metalloids like arsenic from industrial areas into subway environments and reduce their impact on public health, the transport of pollutants in soil was simulated in this study. During numerical simulations of a contaminated site, the pollutant (arsenic) was transported from layers of higher to lower concentration, and concentration changes were particularly evident in the early simulation stages. The pollutant was transported in soil along the direction of groundwater flow and spread from the center to the periphery of the contaminated zone without inputs from pollution sources. After approximately 400 days, the concentration of all layers became uniform, with slow decreases occurring over time. The pollutant supply rate had a major influence on the pollutant diffusion distance. When other conditions were kept constant, higher supply rates resulted in longer diffusion distances. The simulation results show that a diaphragm wall of a certain depth can effectively control the diffusion of pollutants in soil. These results can be used to improve environmental assessments and remediation efforts and inform engineering decisions during the construction of urban infrastructure at sites affected by historical pollution.

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Source
http://dx.doi.org/10.1007/s11356-017-0968-0DOI Listing

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