Metal removal mechanisms in a short hydraulic residence time subsurface flow compost wetland for mine drainage treatment

Gandy, Catherine J.; Davis, Jane E.; Orme, Patrick; Potter, Hugh; Jarvis, Adam P.

doi:10.1016/j.ecoleng.2016.09.011

Cited by 33 publications

(35 citation statements)

References 33 publications

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“…Details of the pilot scale treatment system at Rampgill were reported by Gandy et al (2016) and are summarized here. The Rampgill Mine was exploited for Pb and Zn, mine water discharge from the abandoned mine is at pH 7.7 and contained Zn (2.2 mg L −1 ) and sulfate (134 mg L −1 ).…”

Section: Pilot Study Of Mine Water Bioremediation At Rampgill Ukmentioning

confidence: 99%

The Microbiology of Metal Mine Waste: Bioremediation Applications and Implications for Planetary Health

Newsome

Falagán

2021

GeoHealth

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Microbes colonise and inhabit mine wastes, they tolerate high concentrations of metals and contribute to soil functioning and plant growth  Microbes transform metal speciation and environmental mobility, through metabolism, biogeochemical cycling and metal resistance mechanisms  Beneficial microbial activity can be stimulated to remediate metal-containing mine wastes, but more long-term field studies are required

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Section: Pilot Study Of Mine Water Bioremediation At Rampgill Ukmentioning

confidence: 99%

The Microbiology of Metal Mine Waste: Bioremediation Applications and Implications for Planetary Health

Newsome

Falagán

2021

GeoHealth

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“…Processes of metal removal and mobilisation in a wetland include sedimentation, adsorption, complexation, bio‐remediation, uptake by plants and microbially mediated reactions including oxidation and reduction (Perry & Kleinmann ; Dunbabin & Bowmer ; Whitehead & Prior ; Akcil & Koldas ; Stoltz & Greger, ; Sheoran & Sheoran ; Nyquist & Greger ; Gandy et al . ). Several studies have also reported significant water quality improvements in terms of metal removal by wetland substrate (Garcia et al .…”

Section: Introductionmentioning

confidence: 97%

“…The effective retention of mine effluent by wetland substrate has been documented in different mining areas in the world (Faulkner & Richardson 1989;Dunbabin & Bowmer 1992;Johnson & Hallberg 2005). Processes of metal removal and mobilisation in a wetland include sedimentation, adsorption, complexation, bio-remediation, uptake by plants and microbially mediated reactions including oxidation and reduction (Perry & Kleinmann 1991;Dunbabin & Bowmer 1992;Whitehead & Prior 2005;Akcil & Koldas 2006;Stoltz & Greger, 2006;Sheoran & Sheoran 2006;Nyquist & Greger 2009;Gandy et al 2016). Several studies have also reported significant water quality improvements in terms of metal removal by wetland substrate (Garcia et al 2001;Nyquist & Greger 2009).…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of wetlands in retaining metals from mine water, South Africa

Abiye

Mkansi

Masindi

et al. 2017

Water & Environment J

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Wetlands are effectively used to treat mine water effluent in South Africa, where they retain toxic metals that can potentially contaminate the environment. Wetlands that are located close to the abandoned tailings dams were chosen and solidified substrate samples were collected for thin section microscopy, X‐ray fluorescence (XRF) and X‐ray diffraction (XRD) analyses. In order to determine the concentration of selected metals in the tailings dams, fine grained samples were collected and leached with a diluted nitric acid and deionised water to simulate leaching by rainwater. The results from the substrate analysis revealed an overall oxide abundance of 71.76 weight percent (%) and an elevated metal concentration, which suggest a crucial role played by pH, redox, wetland sediments and wetland plants in maintaining oxygen circulation and triggering reactions. The study confirmed the efficiency of wetlands in the attenuation of toxic metals from the mine water.

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“…Many of these have circum-neutral pH and, in contrast to extremely acidic mine waters, contain relatively little soluble iron, though concentrations of other transition metals, such as zinc, lead, and cadmium can exceed water quality guidelines. Various treatments options have been suggested and trialed for remediating mine water of this kind, including constructed wetlands and compost bioreactors which use microbiological processes, in tandem with chemical adsorption, to remove potentially toxic metals (Younger et al, 2003;Gandy et al, 2016). A primary role of microorganisms in this context is to generate hydrogen sulfide from the dissimilatory reduction of more oxidized forms of sulfur (such as sulfate), which in turn reacts with many metals that commonly occur in mine discharge waters to form insoluble sulfide phases (Johnson and Hallberg, 2005).…”

Section: Introductionmentioning

confidence: 99%

Removal of Zinc From Circum-Neutral pH Mine-Impacted Waters Using a Novel “Hybrid” Low pH Sulfidogenic Bioreactor

Holanda

Johnson

2020

Front. Environ. Sci.

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Environmental pollution associated with metal-contaminated waters discharging from abandoned mine sites is a global issue. Remediation using passive systems, such as constructed wetlands, has several significant detractions which active treatment systems that harness the abilities of hydrogen sulfide-generating bacteria to immobilize transition metals and ameliorate pH can obviate, including the potential for recovering and recycling metals. Here we describe the commissioning and testing of a laboratoryscale, continuous flow "hybrid" sulfidogenic bioreactor (HSB) where both elemental (zero-valent) sulfur (ZVS) and sulfate were provided as potential electron acceptors and glycerol as the primary electron donor for the bacterial consortium immobilized in the bioreactor vessel. The consortium included several species of acid-tolerant bacteria that catalyze the dissimilatory reduction of both ZVS and sulfate, and a novel acidophilic ZVS-reducing Firmicute, distantly related to known sulfidogens. The HSB was used to remediate synthetic and actual circum-neutral pH, zinc-contaminated water bodies from two abandoned metal mining sites in the United Kingdom. In both cases, zinc was successfully (>99%) removed from solution as a sulfide (ZnS) phase using both in-line (where mine water was pumped directly into the bioreactor) and off-line (where hydrogen sulfide was transferred from the HSB to a separate contactor vessel containing the mine waters) configurations. Both mine waters contained sufficient alkalinity to effectively neutralize the generation of acidity resulting from ZnS formation. A potential scenario for full-scale treatment of one of the mine waters using a HSB is described.

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Metal removal mechanisms in a short hydraulic residence time subsurface flow compost wetland for mine drainage treatment

Cited by 33 publications

References 33 publications

The Microbiology of Metal Mine Waste: Bioremediation Applications and Implications for Planetary Health

The Microbiology of Metal Mine Waste: Bioremediation Applications and Implications for Planetary Health

Effectiveness of wetlands in retaining metals from mine water, South Africa

Removal of Zinc From Circum-Neutral pH Mine-Impacted Waters Using a Novel “Hybrid” Low pH Sulfidogenic Bioreactor

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