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Investigation into the physicochemical behaviours of ferruginous mine waters from across the globe

Sutton, Alexander 2017. Investigation into the physicochemical behaviours of ferruginous mine waters from across the globe. PhD Thesis, Cardiff University.
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This thesis investigates the behaviours of iron(II) oxidation, iron(III) settling and total iron removal from ferruginous circumneutral, and to a lesser extent, acidic coal mine water discharges from across the globe. Comparisons are drawn between existing iron(II) oxidation and iron removal studies and new knowledge is developed in the area of iron(III) settling behaviour, iron removal rate-limiting steps and methods to examine the treatability of ferruginous circumneutral mine water. Measured iron(II) oxidation rates are shown to be higher in this study than previous authors’ work, which is likely to be due to higher concentrations of particulate iron(III) present in the mine water that acts to catalyse the oxidation reaction. The iron(III) settling rate constant is shown to be proportional to the initial total iron concentration, however it is also seemingly effected by the concentration of magnesium and calcium present in the mine water. Rates of total iron removal are shown to be in general linearly proportional to the initial total iron concentration due to the acidity of the mine water, and oxidation and settling rate limiting steps, however some data does lie off of the trendline, meaning that it would not be suitable to be used to predict final total iron concentrations. Additionally a small study on modelling of the settling lagoons to predict the outlet iron concentrations based upon the inlet conditions and hydraulics of the lagoon was conducted and compared to existing settling lagoon formulae to ascertain which was the most accurate in terms of correctly predicting the outlet iron concentrations.

Item Type: Thesis (PhD)
Date Type: Completion
Status: Unpublished
Schools: Engineering
Uncontrolled Keywords: Mine Water; Iron; Oxidation; Settling; Treatment; Passive.
Date of First Compliant Deposit: 14 September 2017
Last Modified: 15 Sep 2021 15:38

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