Origin of high manganese concentrations in coal mine drainage, eastern Tennessee

Larsen, Daniel; Mann, Richard S.

doi:10.1016/j.gexplo.2005.06.001

Cited by 47 publications

(28 citation statements)

References 30 publications

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“…At near-neutral pH, Mn is much more immobile as extractable yields drop to 0.3%-30% (average 10%). This could be attributed to the formation of Mn oxides and hydroxides, which are known to precipitate from oxidised waters at slightly alkaline pH values (Larsen and Mann 2005;Yue and Zhao 2008). This would account for (1) the lower extractable fractions observed in leachates around pH 7 and (2) the attenuating effects on the releases of a number of trace pollutants, as will be discussed.…”

Section: Transition Metals: Fementioning

confidence: 96%

Leaching of potential hazardous elements of coal cleaning rejects

Silva

Izquierdo

Querol

et al. 2010

Environ Monit Assess

107

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The geochemical characteristics of coal cleaning rejects (CCR) in Santa Catarina State, Brazil, were investigated. Around 3.5 million ton/year of coal waste are dumped in Santa Catarina State. Coal beneficiation by froth flotation results in large amounts of CCR composed of coaly and mineral matter, the latter characterised by the occurrence of sulphide minerals and a broad array of leachable elements. The total and leachable contents of more than 60 elements were analysed. Atmospheric exposure promotes sulphide oxidation that releases substantial sulphate loads as well as Ca2+, K+, Mg2+, Cl- and Al3+. The metals with the most severe discharges were Zn, Cu, Mn, Co, Ni and Cd. Most trace pollutants in the CCR displayed a marked pH-dependent solubility, being immobile in near-neutral samples. The results highlight the complex interactions among mineral matter solubility, pH and the leaching of potentially hazardous elements.

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Section: Transition Metals: Fementioning

confidence: 96%

Leaching of potential hazardous elements of coal cleaning rejects

Silva

Izquierdo

Querol

et al. 2010

Environ Monit Assess

107

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“…Acid mine drainage (AMD) results from the oxidation of sulfides, typically pyrite, and is characterized by low pH and high concentrations of SO 4 2-, Fe, metalloids, and many metals (Larsen and Mann 2005). Abandoned mines and tailings piles can be sources for AMD and represent risk to the equilibrium of different ecosystems (Moncur et al 2005, Cravotta 2008), especially when efficient mitigating actions against acidity are not applied.…”

Section: Introductionmentioning

confidence: 99%

Geochemistry of acid mine drainage from a coal mining area and processes controlling metal attenuation in stream waters, southern Brazil

Campaner

Luiz-Silva

Machado

2014

An. Acad. Bras. Ciênc.

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Acid drainage influence on the water and sediment quality was investigated in a coal mining area (southern Brazil). Mine drainage showed pH between 3.2 and 4.6 and elevated concentrations of sulfate, As and metals, of which, Fe, Mn and Zn exceeded the limits for the emission of effluents stated in the Brazilian legislation. Arsenic also exceeded the limit, but only slightly. Groundwater monitoring wells from active mines and tailings piles showed pH interval and chemical concentrations similar to those of mine drainage. However, the river and ground water samples of municipal public water supplies revealed a pH range from 7.2 to 7.5 and low chemical concentrations, although Cd concentration slightly exceeded the limit adopted by Brazilian legislation for groundwater. In general, surface waters showed large pH range (6 to 10.8), and changes caused by acid drainage in the chemical composition of these waters were not very significant. Locally, acid drainage seemed to have dissolved carbonate rocks present in the local stratigraphic sequence, attenuating the dispersion of metals and As. Stream sediments presented anomalies of these elements, which were strongly dependent on the proximity of tailings piles and abandoned mines. We found that precipitation processes in sediments and the dilution of dissolved phases were responsible for the attenuation of the concentrations of the metals and As in the acid drainage and river water mixing zone. In general, a larger influence of mining activities on the chemical composition of the surface waters and sediments was observed when enrichment factors in relation to regional background levels were used.

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“…Once the pH is lowered, trace elements such as Ni, Zn, and Pb from sulphide oxidation as well as Al and Mn from associated weathering processes are leached (e.g. Nicholson 1994;Larsen and Mann 2005). This acidic metalenriched runoff is known as acid mine drainage (AMD).…”

mentioning

confidence: 99%

Environmental Impact on an Arctic Soil–Plant System Resulting from Metals Released from Coal Mine Waste in Svalbard (78° N)

Askaer

Schmidt

Elberling

et al. 2008

Water Air Soil Pollut

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Impact of acid mine drainage (AMD) from a coal mine waste rock pile deposited within a permafrost-affected Arctic ecosystem was investigated near Longyearbyen (Svalbard, 78°N). Analyses included metal concentrations (Al, Fe, Mn, Zn, Ni, Cr, As and Pb) in runoff, soil and plants. It was observed that impacts of AMD, such as plant degradation, were similar to impacts reported from non-arctic ecosystems. It was found that bio-available metal concentrations in soil samples were not useful in assessing potential plant toxicity, as metals were not accumulated in the most impacted area due to low soil pH (pH<4). Native graminoid plants in the high impacted area showed accumulation of all the investigated elements. Al, Mn and As were found at phyto-toxic concentrations. Metal uptake in two native graminoid plants was studied in the laboratory. Positive correlations were noted between metal concentrations and plant uptake for all metals investigated, except Fe. High Fe concentrations found in plant samples in the impacted area are considered a result of Fe-oxide precipitation (plaque) on leaves during the spring flush when runoff covers the plants. We conclude that the weathering products Al, Mn and Fe induce the largest negative impact on vegetation in the area, and that a major fraction of the annual uptake of metals occurs during spring flushes. During these flushes, metals produced from weathering processes throughout the winter are released in high concentrations, coinciding with low pH values, low infiltration rates due to permafrost and the start of the plant growth season.

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Origin of high manganese concentrations in coal mine drainage, eastern Tennessee

Cited by 47 publications

References 30 publications

Leaching of potential hazardous elements of coal cleaning rejects

Leaching of potential hazardous elements of coal cleaning rejects

Geochemistry of acid mine drainage from a coal mining area and processes controlling metal attenuation in stream waters, southern Brazil

Environmental Impact on an Arctic Soil–Plant System Resulting from Metals Released from Coal Mine Waste in Svalbard (78° N)

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