Acid Mine Drainage From Abandoned Mine Sites: Problematic and Reclamation Approaches

Bussière, Bruno

doi:10.1007/978-3-642-04460-1_6

Cited by 17 publications

(16 citation statements)

References 40 publications

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“…However there are some species that are common to most of such systems. Following discussions in [25,26,27,28,29], the following set of species are common and will be considered in this discussion:…”

Section: Acid Drainage Modelmentioning

confidence: 99%

“…where Γ is the dispersion component in the x direction. Substituting into the non-linear model (Equations (31)- (35)) and linear model (Equations (19)- (26)) results in the initialboundary value problem, find U(x, t) such that:…”

Section: Computational Modelmentioning

confidence: 99%

“…Ferrous ion profiles in the large model (19)-(26) and reduced model (31)-(35), when diffusities and velocities are high.…”

mentioning

confidence: 99%

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Modelling and simulation of reactive transport phenomena

Amikiya

Banda

2018

Journal of Computational Science

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Mathematical modelling and numerical simulation of chemical transport phenomena are very challenging due to large numbers of species and reactions involved. Reactive transport models for such systems have high degrees of freedom, and therefore, are computationally expensive to solve. In this discussion, we present and numerically analyse stoichiometric decoupling method for reducing the high degrees of freedom and hence, cost of simulation. This method is a model reduction procedure that is based on some key properties of chemical systems. A multi-scale model of a passive treatment method for acidic mine effluents is used to test the efficacy of the reduction procedure. Moreover, reduced models are characteristically non-linear and stiff, thus, we used numerical techniques to study the reduction error in order to establish compatibility/efficiency of the reduction procedure.

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Section: Acid Drainage Modelmentioning

confidence: 99%

Section: Computational Modelmentioning

confidence: 99%

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Modelling and simulation of reactive transport phenomena

Amikiya

Banda

2018

Journal of Computational Science

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“…Covering of tailings with a low permeability material is one common means of minimize the potential hazardous effects of gold mine tailings on the surrounding environment by: (i) preventing any direct contact between tailings and humans, (ii) minimizing wind blow distribution and inhalation of fine tailings, and (iii) reducing the infiltration of precipitation through the tailings; therefore, minimizing potentiality of arsenic release (Bussière 2009;Mazzieri et al 2013;Zhang et al 2016). …”

Section: Introductionmentioning

confidence: 97%

Performance of polymer-enhanced bentonite–sand mixture for covering arsenic-rich gold mine tailings for up to 4 years

Hosney

Rowe

2017

Can. Geotech. J.

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Experiments conducted over a 4-year period, on a polymer enhanced bentonite-sand mixture (PEBSM) used as cover for gold mine tailings are reported. The effect on PEBSM hydraulic conductivity (k) of subgrade porewater chemistry, subgrade water content, and confining stress are investigated. Results show that the reduction in the mole fraction of bound Na + (ESP) and corresponding increase in k of PEBSM with time was highly dependent on the ionic strength of the subgrade porewater. When the PEBSM was in direct contact with gold mine tailings with porewater having an ionic strength of 145 mM, ESP decreased from 59% to 2% and k increased from 4x10 -11 to 6.9x10 -9 m/s. The ESP and k values of PEBSM over tailings with 11 mM porewater were 21% and 6.9x10 -11 m/s. A 0.15-m-thick foundation layer between tailings and PEBSM layer significantly lowered the reduction in ESP and increase in k with time as did a reduction in the subgrade water content. There was no effect of changing confining stress from 15 to 7.5 kPa on k values of PEBSM. The PEBSM layer acted as a good barrier to the migration of arsenic from tailings upward towards cover soil above PEBSM layer.

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“…Demers et al [5] found that the use of desulfurized tailings as a cover material combined with water table elevation was able to prevent the production of AMD by reducing the oxygen diffusion rate and thereby preventing sulfide oxidation. Bussière [6] reported that the synthetic materials (such as geomembranes and bentonite geocomposites) can control the production of AMD by limiting the water flow though reactive mine wastes. However, these methods are difficult to implement and display a security risk over the long term.…”

Section: Introductionmentioning

confidence: 99%