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Evaluates PFOA impact on groundwater, suggesting advanced systems are crucial for compliance.
The mechanisms governing the migration of perfluorooctanoic acid (PFOA) at different stages during the operation of a municipal solid waste landfill are examined and the effectiveness of inward gradient system designs in mitigating PFOA impact on an underlying aquifer is evaluated. The peak concentrations of PFOA in the underlying aquifer are reported and compared to the drinking water objective for PFOA for each design and hydrogeologic situation examined. The findings indicate that while natural aquitards provide some attenuation, advanced barrier systems incorporating hydraulic control layers (HCL) and geomembranes (GMB) may be essential for meeting strict regulatory limits. It is demonstrated that two uncertain parameters (i.e., the mass of PFOA per unit area and the half-life of PFOA) greatly influence peak impact and the contaminating lifespan of the facility. The effect of the service life of both the leachate collection system and the geomembrane is examined. The modelling results and practical recommendations for design and maintenance are discussed.
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Rowe et al. (2026) studied this question.
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