Acid mine drainage: Prevention, treatment options, and resource recovery: A review

Kefeni, Kebede K.; Msagati, Titus A.M.; Mamba, Bhekie B.

doi:10.1016/j.jclepro.2017.03.082

Cited by 616 publications

(312 citation statements)

References 160 publications

Supporting

Mentioning

238

Contrasting

Unclassified

Order By: Relevance

“…The results indicate that at 15 d operation time, H 2 CO 3(aq) is transporting carbon out of the central loop (i.e. away from the biocathode) due to diffusion at a rate higher than HCO 3 À is migrating towards the biocathode. This is largely due to the relatively-higher concentrations of H 2 CO 3(aq) in the central loop compared to the precipitation loop.…”

Section: 27mentioning

confidence: 93%

“…from A1 to A2). Other species transported into A2 are Cl À , NO 3 À and NaSO 4 À , while some species were found to transport in the opposite direction (A2 to A1), including H + , Na + and H 2 S (aq) . The rates of migration of each species are proportional to the activity, charge and Fickian diffusion coefficient as described in Thompson Brewster et al 7 Sulfate provides 96% of the anions (in [mol]) in the feed, resulting in a high coulombic efficiency for its migration, but there will always be co-transport by other anions and undesired back-diffusion of species (for example, Na + and H + ) where the concentration gradient across the membrane results in diffusion in the direction opposite to migration.…”

Section: àmentioning

confidence: 95%

See 1 more Smart Citation

A modelling approach to assess the long-term stability of a novel microbial/electrochemical system for the treatment of acid mine drainage

et al. 2018

View full text Add to dashboard Cite

Microbial electrochemical processes have potential to remediate acid mine drainage (AMD) wastewaters which are highly acidic and rich in sulfate and heavy metals, without the need for extensive chemical dosing. In this manuscript, a novel hybrid microbial/electrochemical remediation process which uses a 3-reactor system -a precipitation vessel, an electrochemical reactor and a microbial electrochemical reactor with a sulfate-reducing biocathode -was modelled. To evaluate the long-term operability of this system, a dynamic model for the fluxes of 140 different ionic species was developed and calibrated using laboratory-scale experimental data. The model identified that when the reactors are operating in the desired state, the coulombic efficiency of sulfate removal from AMD is high (91%). Modelling also identified that a periodic electrolyte purge is required to prevent the build-up of Cl À ions in the microbial electrochemical reactor. The model furthermore studied the fate of sulfate and carbon in the system.For sulfate, it was found that only 29% can be converted into elemental sulfur, with the rest complexating with metals in the precipitation vessel. Finally, the model shows that the flux of inorganic carbon under the current operational strategy is insufficient to maintain the autotrophic sulfate-reducing biomass. The modelling approach demonstrates that a change in system operational strategies plus close monitoring of overlooked ionic species (such as Cl À and HCO 3 À ) are key towards the scaling-up of this technology.

show abstract

Section: 27mentioning

confidence: 93%

Section: àmentioning

confidence: 95%

A modelling approach to assess the long-term stability of a novel microbial/electrochemical system for the treatment of acid mine drainage

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Many traditional processes for the treatment of acid mine water was briefly discussed by Kefeni et al (2017). There may be divided into active and passive treatment options.…”

Section: Introductionmentioning

confidence: 99%

The study of leachability and toxicity of sludge after neutralization of Saraka and Robule AMD wastewaters

Gardic¹,

Marković²,

Masuda³

et al. 2017

J Min Metall A

View full text Add to dashboard Cite

Acid mine drainage (AMD) waters are one of the most important ecological risks at the global level because of its high heavy metals content and strong acidity. Treatment of AMD water is a complex and expensive. One of the most widely used treatment process is the neutralization process of AMD. The result of neutralization is the production of sludge which may contain various other (heavy) metals, depending on the chemical characteristics of the mine water treated. In this paper, leachability and toxicity of the sludges obtained during the neutralization process of wastewater from Saraka and Robule acid mine drainage and the sludges after the stabilization process at different temperatures is tested. Sludge produced in the neutralization process of Robule AMD R4 (40)

show abstract

“…Acid mine drainage (AMD), as a result of the oxidation of framboidal type pyrite (FeS 2 ), yields dissolved sulfates of Fe (ferric and ferrous) (Farrand, 1970) and subsequent oxidation of Fe, resulting in typical yellowish‐red aggregates (“yellow boy”) that are seen downstream from mining areas. The colloidal dynamics of Fe particle aggregates have received much attention since such processes are among the most important surface‐governed phenomena encountered in AMD environments (Kefeni et al, 2017). The principal factor controlling Fe oxidation and aggregation is pH (Gilbert et al, 2007).…”

mentioning

confidence: 99%

Colloidal Dynamics of Freshly Formed Iron Oxides under the Influence of Silicic Acid

Dam

Hoang²,

Nguyen³

et al. 2019

J of Env Quality

View full text Add to dashboard Cite

Silicic acid and soluble Fe are among the most abundant components in acid mine drainage. During the oxidation of Fe(II), the interaction between silicic acid and freshly formed Fe oxides might change the colloidal dynamics, altering surface charge properties. However, the effects of silicic acid on colloidal Fe oxides formed from acid mine drainage are not fully understood. In this work, we examined the colloidal dynamics of freshly formed Fe oxides in synthetic acid mine drainage (prepared from FeSO4 solution) under the effect of silicic acid as a function of changes in pH and ionic strength. The results demonstrate that through adsorption, silicic acid progressively slows oxidation and enhances the dispersion of freshly formed Fe oxides by shifting the surface charge toward more negative values. This effect was most prominent between pH 5 and 9. The current results demonstrate that silicic acid enhances the dispersion and transport of freshly formed Fe oxides and suggest that aggregation‐based techniques for the treatment of Fe‐rich drainage may require further consideration of this effect. Core Ideas Silicic acid may occur at a significant concentration in Fe‐rich acid mine drainage. During the oxidation of Fe, silicic acid can react and modify the Fe oxide surface charge. By shifting the surface charge to lower levels, silicic acid can favor Fe oxide dispersion. Silicic acid can thus promote the transport of acid mine drainage‐derived Fe(III) oxides.

show abstract

Acid mine drainage: Prevention, treatment options, and resource recovery: A review

Cited by 616 publications

References 160 publications

A modelling approach to assess the long-term stability of a novel microbial/electrochemical system for the treatment of acid mine drainage

A modelling approach to assess the long-term stability of a novel microbial/electrochemical system for the treatment of acid mine drainage

The study of leachability and toxicity of sludge after neutralization of Saraka and Robule AMD wastewaters

Colloidal Dynamics of Freshly Formed Iron Oxides under the Influence of Silicic Acid

Contact Info

Product

Resources

About