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University of Western Australia (2020)

Analysis of processes controlling fluoride and phosphate release during managed aquifer recharge

Schafer David

Titre : Analysis of processes controlling fluoride and phosphate release during managed aquifer recharge

Auteur : Schafer David

Université de soutenance : University of Western Australia

Grade : Doctor of Philosophy (PhD) 2020

Résumé
The release of geogenic contaminants from ubiquitous apatite minerals following the injection of low ionic strength water into aquifers was investigated using experimental, analytical and modelling approaches. Batch-type laboratory experiments were performed to study the mechanisms controlling the field-observed release of fluoride and phosphate that occurred during a four-year long field experiment. Preferential removal of divalent calcium ions onto sediment exchange sites under low ionic strength conditions was found to be the trigger for fluoride and phosphate release from carbonate-rich fluorapatite. Geochemical and reactive transport modelling was used to both interpret laboratory and field-scale observations and to assess mitigation strategies.

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Page publiée le 24 janvier 2021