Geochemical Modeling of the Speciation of Uranium in an Acid Mine Drainage Environment in the Witwatersrand Basin

2008 ◽  
Author(s):  
Hlanganani Tutu ◽  
Ewa Cukrowska ◽  
T McCarthy
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Geochemical Modeling ◽  
Witwatersrand Basin ◽  
Acid Mine

scholarly journals Geochemical Modeling of Iron and Aluminum Precipitation during Mixing and Neutralization of Acid Mine Drainage

Minerals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 547 ◽  
Author(s):  
Darrell Kirk Nordstrom
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Geochemical Modeling ◽  
Lime Treatment ◽  
Mixing Processes ◽  
Ph Values ◽  
Acid Mine ◽  
Water Composition ◽  
Slaked Lime ◽  
Best Fit

Geochemical modeling of precipitation reactions in the complex matrix of acid mine drainage is fundamental to understanding natural attenuation, lime treatment, and treatment procedures that separate constituents for potential reuse or recycling. The three main dissolved constituents in acid mine drainage are iron, aluminum, and sulfate. During the neutralization of acid mine drainage (AMD) by mixing with clean tributaries or by titration with a base such as sodium hydroxide or slaked lime, Ca(OH)2, iron precipitates at pH values of 2–3 if oxidized and aluminum precipitates at pH values of 4–5 and both processes buffer the pH during precipitation. Mixing processes were simulated using the ion-association model in the PHREEQC code. The results are sensitive to the solubility product constant (Ksp) used for the precipitating phases. A field example with data on discharge and water composition of AMD before and after mixing along with massive precipitation of an aluminum phase is simulated and shows that there is an optimal Ksp to give the best fit to the measured data. Best fit is defined when the predicted water composition after mixing and precipitation matches most closely the measured water chemistry. Slight adjustment to the proportion of stream discharges does not give a better fit.

scholarly journals Precipitation of heavy metals from acid mine drainage and their geochemical modeling

2014 ◽  
Vol 9 (1) ◽  
pp. 79-86 ◽  
Author(s):  
Aneta Petrilakova ◽  
Magdalena Balintova ◽  
Marian Holub
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Geochemical Modeling ◽  
Vital Role ◽  
Dissolved Metals ◽  
Environmental Preservation ◽  
Surface Water Hydrology ◽  
Acid Mine ◽  
Modeling Software ◽  
High Concentrations

Abstract Geochemical modeling plays an increasingly vital role in a number of areas of geoscience, ranging from groundwater and surface water hydrology to environmental preservation and remediation. Geochemical modeling is also used to model the interaction processes at the water - sediment interface in acid mine drainage (AMD). AMD contains high concentrations of sulfate and dissolved metals and it is a serious environmental problem in eastern Slovakia. The paper is focused on comparing the results of laboratory precipitation of metal ions from AMD (the Smolnik creek, Slovakia) with the results obtained by geochemical modeling software Visual Minteq 3.0.

scholarly journals A Predictive Model forthe Future Treatment of Acid Mine Drainage with Regression Analysis and Geochemical Modeling

2014 ◽  
Vol 130 (10_11) ◽  
pp. 488-493 ◽  
Author(s):  
Hiroshi OTSUKA ◽  
Shinsuke MURAKAMI ◽  
Jiro YAMATOMI ◽  
Ryu KOIDE ◽  
Chiharu TOKORO
Keyword(s):  
Regression Analysis ◽  
Acid Mine Drainage ◽  
Predictive Model ◽  
Mine Drainage ◽  
Geochemical Modeling ◽  
Future Treatment ◽  
Acid Mine

Assessment of contaminants transport in a watershed affected by acid mine drainage, by coupling hydrological and geochemical modeling tools

2014 ◽  
Vol 64 ◽  
pp. 78-91 ◽  
Author(s):  
Nymphodora Papassiopi ◽  
Christina Zaharia ◽  
Anthimos Xenidis ◽  
Katerina Adam ◽  
Alexandros Liakopoulos ◽  
...  
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Geochemical Modeling ◽  
Modeling Tools ◽  
Acid Mine ◽  
Contaminants Transport

scholarly journals Geochemical modeling of a natural remediation of an acid mine drainage from an abandoned mine in northern Japan

2021 ◽  
Author(s):  
Sereyroith Tum ◽  
Tsutomu Sato ◽  
Tsubasa Otake ◽  
Yoko Ohtomo ◽  
Tatsuya Matsui ◽  
...  
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Geochemical Modeling ◽  
Abandoned Mine ◽  
Acid Mine ◽  
Natural Remediation ◽  
Northern Japan
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