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<p>The Kpone Engineered Landfill (KEL) site is a key waste management facility in Ghana, but poor site management has led to leachate migration, potentially contaminating nearby soil and groundwater. Given the facility’s proximity to residential areas, assessing the extent of contamination is essential for effective management and the prevention of health risks. Previous assessments of the site, conducted through soil and water sampling and analysis, indicated possible contamination but were limited by cost and labor intensity. In contrast, geoelectrical methods, such as electrical resistivity tomography (ERT) and induced polarization (IP), offer a non-invasive, cost-effective alternative means of mapping subsurface conditions. The ERT detects resistivity variations, while IP characterizes chargeability anomalies, ensuring a robust dual-layered analysis of leachate pollution and reducing interpretative uncertainties. Accordingly, this study aimed to employ ERT and IP to map the contamination at the KEL site, to complement the previous assessments. ERT and IP measurements were taken along five profiles (A, B, C, D, and E) of approximately 200&#xa0;m, oriented parallelly in east–west directions and orthogonally, using dipole–dipole arrays with a 5-m electrode spacing. The study confirmed leachate contamination along Profiles A, C, D, and E with low electrical resistivity and moderate-to-high chargeability values. In contrast, Profile B exhibited low resistivity and low chargeability, suggesting no significant pollution in that area. These findings corroborate earlier studies and provide a more detailed information on the lateral and vertical movement of leachate at the site. This is crucial for optimizing waste management strategies and mitigating potential risks to human health, both locally and nationally. Some remediation strategies, including natural attenuation, permeable reactive barriers, and bioremediation, will be thoroughly evaluated to determine the most suitable approach for mitigating the environmental impact of contamination at the site.</p>

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Investigating soil and groundwater contamination around the Kpone Engineered Landfill site, Ghana, using geoelectrical methods

  • 期刊论文

  • 发表日期：

    2025年7月29日

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  • Ralph Tagoe,
  • Franklin Obiri-Nyarko,
  • Collins Okrah,
  • Patrick A. Mainoo,
  • Evans Manu,
  • David D. Wemegah,
  • Anthony A. Duah,
  • Anthony Y. Karikari,
  • William A. Agyekum

摘要

The Kpone Engineered Landfill (KEL) site is a key waste management facility in Ghana, but poor site management has led to leachate migration, potentially contaminating nearby soil and groundwater. Given the facility’s proximity to residential areas, assessing the extent of contamination is essential for effective management and the prevention of health risks. Previous assessments of the site, conducted through soil and water sampling and analysis, indicated possible contamination but were limited by cost and labor intensity. In contrast, geoelectrical methods, such as electrical resistivity tomography (ERT) and induced polarization (IP), offer a non-invasive, cost-effective alternative means of mapping subsurface conditions. The ERT detects resistivity variations, while IP characterizes chargeability anomalies, ensuring a robust dual-layered analysis of leachate pollution and reducing interpretative uncertainties. Accordingly, this study aimed to employ ERT and IP to map the contamination at the KEL site, to complement the previous assessments. ERT and IP measurements were taken along five profiles (A, B, C, D, and E) of approximately 200 m, oriented parallelly in east–west directions and orthogonally, using dipole–dipole arrays with a 5-m electrode spacing. The study confirmed leachate contamination along Profiles A, C, D, and E with low electrical resistivity and moderate-to-high chargeability values. In contrast, Profile B exhibited low resistivity and low chargeability, suggesting no significant pollution in that area. These findings corroborate earlier studies and provide a more detailed information on the lateral and vertical movement of leachate at the site. This is crucial for optimizing waste management strategies and mitigating potential risks to human health, both locally and nationally. Some remediation strategies, including natural attenuation, permeable reactive barriers, and bioremediation, will be thoroughly evaluated to determine the most suitable approach for mitigating the environmental impact of contamination at the site.