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fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Languages: English
Types: Doctoral thesis
Subjects: TP
This thesis presents the results of research undertaken into the rates of Fe(II) oxidation and CO2 stripping from ferruginous mine drainage. It also provides new insight into the applicability of Vertical Flow Reactors (VFRs) to the treatment circumneutral waters.\ud Batch-wise experiments were used to determine Fe(II) oxidation rates in the field. The data collected were used to show that values for the rate constant k1 were up to 3 orders of magnitude greater at the field sites than would be predicted from previously published laboratory studies. A methodology was also developed for determining k2 (the heterogenous oxidation rate constant) in the field.\ud The results of field based monitoring of aeration cascades as well as batchwise CO2 stripping experiments conducted using waters of varying chemistry were combined with geochemical modelling to demonstrate the evolution of the chemistry in these systems over time. The aeration cascades were shown to remove approximately 50% of the dissolved CO2 initially present but this was not shown to have an appreciable effect on mine water treatability. Continued removal of the residual CO2 fraction by mechanical aeration resulted in the elevation of pH by up to 2 units.\ud Trials of pilot scale Vertical Flow Reactors (VFR) at two sites in South Wales showed that rapid decreases in bed permeability over time make these systems unsuitable for deployment in the treatment highly net alkaline waters. As a result of adverse weather conditions and other technical difficulties there was insufficient data collected to determine the performance of these systems under net acid conditions. Qualitative observations suggest however that Fe removal was taking place at a significantly higher rate than would be seen in settling lagoons under the same conditions.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

    • Hedin, R. S., Nairn, R., Kleinmann R. (1994) Passive Treatment of Coal Mine Drainage, US Bureau of Mines IC 9389, Dept of the Interior, Washington DC
    • Kirby, C. S., Cravotta, C. A. (2005) Net alkalinity and net acidity 1: Theoretical considerations. Applied Geochemistry 20(10): 1920-1940
    • Kirby, C. S., Dennis, A., Kahler, A. (2009) Aeration to degas CO2, increase pH, and increase iron oxidation rates for efficient treatment of net alkaline mine drainage. Applied Geochemistry 24(7): 1175-1184
    • McAllan, J., Banks, D., Beyer, N., Watson, I. (2009) Alkalinity, temporaty (CO2) and permanent acidity: an empirical assessment of the significance of field and laboratory determinations on mine waters. Geochemistry: Exploration, Environment Analysis 9: 299-312
    • Parkhurst, D. L., Appelo, C. A. J. (1999) User's guide to PHREEQC (Version 2)--a computer program for speciation, batch-reaction, one-dimensional transport, and inverse geochemical calculations. U.S. Geological Survey Water-Resources Investigations. 99-4259
    • Stumm, W., Morgan J. J. (1996) Aquatic Chemistry, Chemical Equilibria and Rates in Natural Waters, Wiley Interscience
    • Sung, W. Morgan., J. J. (1980) Kinetics and Product of Ferrous Iron Oxygenation in Aqueous Systems. Environmental Science and Technology 14(5): 561-568
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