Does leaching of naturally occurring radionuclides from roadway pavements stabilised with coal fly ash have negative impacts on groundwater quality and human health?
| Autor: | N. Vanhoudt, T. Almahayni |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Water Pollutants
Radioactive Environmental Engineering Health Toxicology and Mutagenesis 0211 other engineering and technologies Aquifer 02 engineering and technology 010501 environmental sciences Environment 01 natural sciences Coal Ash Risk Assessment Groundwater pollution Environmental Chemistry Maximum Contaminant Level Humans Coal Water pollution Waste Management and Disposal Groundwater 0105 earth and related environmental sciences Radioisotopes 021110 strategic defence & security studies geography geography.geographical_feature_category business.industry Construction Materials Environmental engineering Pollution Fly ash Environmental science Water quality business |
| Zdroj: | Journal of hazardous materials. 349 |
| ISSN: | 1873-3336 |
| Popis: | We assessed the potential impact of using coal fly ash to stabilise roadway pavements on groundwater quality and human health. The leaching potential of naturally occurring radionuclides (NORs) typically present in the fly ash was assessed with the HYDRUS-1D code and data representative of a segment of the Wisconsin State Trunk Highway 60 as a case study. Our assessment suggests that the impact would be mainly from the chemical toxicity of uranium (U). In our particular case study, U concentration in the leachate exceeded the maximum contaminant level for this element (MCL = 30 μg L−1) in almost all the scenarios. In the groundwater, the MCL was only exceeded under conditions of high leaching and low dilution in the aquifer. The radiological toxicity from the consumption of the contaminated groundwater by a hypothetical adult, however, was at maximum 43% of the individual dose criterion (IDC = 0.1 mSv y−1). The results also highlight the need to consider site-specific conditions such as climate and hydrogeology when assessing the environmental impacts of utilising fly ash in roadway construction applications since they could have profound effects on the assessment findings. There is also a pressing need for reliable and representative data to support realistic assessments. |
| Databáze: | OpenAIRE |
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