Processes Contributing to the Removal of Manganese From Mine Drainage by an Algal Mixture

Clayton, Laura D.; Wildeman, Thomas R.

doi:10.21000/jasmr98010192

Cited by 7 publications

(3 citation statements)

References 5 publications

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“…Note that the element concentrations are far lower than the spring runoff water and are comparable to the USGS test (Hageman and Briggs, 2000). The FeO test uses hydroxyl amine hydrochloride to dissolve iron and manganese oxides (Clayton and Wildeman, 1998). Note that this test causes the release of more iron and aluminum than is contained in the spring runoff water.…”

Section: Virginia Canyon Study Resultsmentioning

confidence: 88%

A Simple Scheme to Determine Potential Aquatic Metal Toxicity from Mining Wastes

Wildeman

Smith

Ranville

2007

Environmental Forensics

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A decision tree (mining waste decision tree) that uses simple physical and chemical tests has been developed to determine whether effluent from mine waste material poses a potential toxicity threat to the aquatic environment. For the chemical portion of the tree, leaching tests developed by the United States Geological Survey, the Colorado Division of Minerals and Geology (Denver, CO), and a modified 1311 toxicity characteristic leaching procedure (TCLP) test of the United States Environmental Protection Agency have been extensively used as a surrogate for readily available metals that can be released into the environment from mining wastes. To assist in the assessment, element concentration pattern graphs (ECPG) are produced that compare concentrations of selected groups of elements from the three leachates and any water associated with the mining waste. The MWDT makes a distinction between leachates or waters with pH less than or greater than 5. Generally, when the pH values are below 5, the ECPG of the solutions are quite similar, and potential aquatic toxicity from cationic metals, such as Pb, Cu, Zn, Cd, and Al, is assumed. Below pH 5, these metals are mostly dissolved, generally are not complexed with organic or inorganic ligands, and hence are more bioavailable. Furthermore, there is virtually no carbonate alkalinity at pH less than 5. All of these factors promote metal toxicity to aquatic organisms. On the other hand, when the pH value of the water or the leachates is above 5, the ECPG from the solutions are variable, and inferred aquatic toxicity depends on factors in addition to the metals released from the leaching tests. Hence, leachates and waters with pH above 5 warrant further examination of their chemical composition. Physical ranking criteria provide additional information, particularly in areas where waste piles exhibit similar chemical rankings. Rankings from physical and chemical criteria generally are not correlated. Examples of how this decision tree has been applied in assessing mine sites are discussed.

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Section: Virginia Canyon Study Resultsmentioning

confidence: 88%

A Simple Scheme to Determine Potential Aquatic Metal Toxicity from Mining Wastes

Wildeman

Smith

Ranville

2007

Environmental Forensics

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“…Note that the element concentrations are far lower than the spring runoff water. The FeO test uses hydroxyl amine hydrochloride to dissolve iron and manganese oxides (Clayton and Wildeman, 1998). Note that this test causes release of more iron and aluminum than is contained in the spring runoff water.…”

Section: Tclpmentioning

confidence: 99%

Development of a Simple Scheme to Determine the Chemical Toxicity of Mine Wastes

Wildeman¹,

Ranville²,

Herron³

et al. 2003

JASMR

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A decision tree that uses simple physical and chemical tests has been developed to determine whether a mine waste poses a toxicity threat to the aquatic environment. For the chemical portion of the tree, leachate tests developed by the US Geological Survey (USGS), the Colorado Division of Minerals and Geology (CDMG), and modified 1311 TCLP test of the EPA have been extensively used. The multi-element power of modern inductively coupled plasma, atomic-emission spectroscopy (ICP-AES) is also a necessary component of the scheme. At two sites in Colorado, Virginia Canyon in the Idaho Springs/Central City Superfund Site and in the Upper Animas River Basin, 25 sediment samples and the water flowing over the sediments were collected. General analytical measurements were made in the field, and then, the water and extracts from the three leachate tests were analyzed for 31 elements by ICP-AES. Then, element concentration pattern graphs (ECPG) were produced that compared selected groups of the elements from the three leachates and the water. When the pHs of the water and the leachate were below 5.0, the element concentration patterns of all four solutions were quite similar and aquatic toxicity from metals such as Pb, Cu, Zn, Mn and Al was clearly indicated. When the pHs of the water and the leachate were above 5.0, the element concentration patterns from the four solutions were different and inferred aquatic toxicity depended on the leachate test. Usually when there was a difference, it was found that in the TCLP test, elements from carbonate minerals and oxides dissolved and these elements in the CDMG and USGS tests were not as readily released from solution. In a study done in 2002 in Russell Gulch near Central City, CO, that rated mine waste piles, it was necessary to rate the contamination possibility of the piles on separate physical and chemical scales for the most complete assessment.

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“…Una de las técnicas empleadas para dichos procesos es la biosorción, que consiste en la transferencia selectiva de uno o más solutos de una fase líquida a un lote de partículas sólidas de material biológico e involucra la participación de diversos mecanismos físicos y químicos en función de diversos factores [7][8]. Debido al origen natural de los sustratos y a la eliminación de lodos residuales durante el proceso de remoción, esta alternativa tecnológica se constituye en un sistema que permite no sólo remover el metal contaminante disminuyendo el impacto ambiental generado sobre el medio en el cual se descarga, sino que además permite recuperarlo para integrarlo a un nuevo ciclo productivo.…”

Section: Introductionunclassified

Biosorción de Cd, Pb y Zn por biomasa pretratada de algas rojas, cáscara de naranja y tuna.

Mendoza

Molina

2015

Cien.Ing.Neogranadina

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<p>Debido a su movilidad en los ecosistemas y a su toxicidad para las formas superiores de vida, los metales pesados Cd, Pb y Zn son priorizados como unos de los contaminantes inorgánicos más importantes debido al alto riesgo que representan para el medio ambiente. Con el objeto de disminuir su concentración se diseñó un sistema para evaluar su remoción empleando biomasa de algas rojas, cáscaras de naranja (Citrus sp.) y tuna guajira (Opuntia sp.). Se estudió la influencia del pretratamiento y el empaquetamiento mediante ensayos tipo batch, en los que se emplearon soluciones de sodio y calcio. Se obtuvo como resultado una mayor capacidad de sorción de las algas modificadas con NaOH 0.1 N y de la naranja y la tuna con modificación sucesiva con NaOH y CaCl2 0.2 M, y una afección poco significativa (≤1%) del proceso de sorción al empacar la biomasa el placas planas de tul poliéster. La eficiencia de remoción se determinó mediante un reactor de flujo continuo de columna fija con un volumen líquido de 400 mL, 75 g de biomasa y tiempos de retención promedio de 1 y 2 h. Los resultados mostraron una eficiencia similar de las tres<br />biomasas para remover Cd y Pb, con promedios superiores al 95%, mientras que el Zn se removió con mejor eficiencia (62%) al emplear tuna modificada como sorbente. Finalmente, el material se calcinó a 700 °C con lo que se obtuvo una ceniza estable frente a soluciones ácidas, lo cual garantiza la captura de los metales removidos.</p>

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Processes Contributing to the Removal of Manganese From Mine Drainage by an Algal Mixture

Cited by 7 publications

References 5 publications

A Simple Scheme to Determine Potential Aquatic Metal Toxicity from Mining Wastes

A Simple Scheme to Determine Potential Aquatic Metal Toxicity from Mining Wastes

Development of a Simple Scheme to Determine the Chemical Toxicity of Mine Wastes

Biosorción de Cd, Pb y Zn por biomasa pretratada de algas rojas, cáscara de naranja y tuna.

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