Identification of sources and processes in a low-level radioactive waste site adjacent to landfills: groundwater hydrogeochemistry and isotopes
| Autor: | Mathew P. Johansen, Brett Rowling, M. Vine, Catherine E. Hughes, Stuart Hankin, Timothy E. Payne, Sangeeth Thiruvoth, Ander Guinea, Jennifer J. Harrison, Henri K. Y. Wong, Dioni I. Cendón, Kerry L. Wilsher |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Australian Journal of Earth Sciences. 62:123-141 |
| ISSN: | 1440-0952 0812-0099 |
| Popis: | Multiple tracer-element and isotope approaches were applied at a 1960s-era low-level radioactive waste burial site located in the Lucas Heights area on the southwest urban fringe of Sydney, Australia. The site is situated among other municipal and industrial (solid and liquid) waste disposal sites causing potential mixing of leachates. Local rainfall contains marine-derived major ion ratios that are modified during infiltration depending on waste interactions. The local geology favours the retention of contaminants by ion-exchange processes within the clay-rich soils and the shale layer underlying the burial site. Local soils experience periodic infiltration and wetting fronts that can fully saturate the waste trenches (bathtub effect) while surrounding soils are mostly unsaturated with discontinuous perched lenses. Within the trenches, the degradation of organic matter results in localised methanogenesis, as suggested by enriched δ2H and δ13CDIC values in adjacent subsurface water. Movement of contaminan... |
| Databáze: | OpenAIRE |
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