Consulta: subjectFacets:"Acid mine drainage"
Registros recuperados: 5
Data/hora: 09/06/2024 11:48:35

Diversity of bacterial communities in acid mine drainage from the Shen-bu copper mine, Gansu province, China
Provedor de dados: Electronic Journal of Biotechnology
Autores: Yang,Yu; Shi,Wuyang; Wan,Minxi; Zhang,Yanfei; Zou,Lihong; Huang,Jufang; Qiu,Guanzhou; Liu,Xueduan.
This study presents bacterial population analyses of microbial communities inhabiting three sites of acid mine drainage (AMD) in the Shen-bu copper mine, Gansu Province, China. These sites were located next to acid-leached chalcopyrite slagheaps that had been abandoned since 1995. The pH values of these samples with high concentrations of metals ranged from 2.0 to 3.5. Amplified ribosomal DNA restriction analysis (ARDRA) was used to characterize the bacterial population by amplifying the 16S rRNA gene of microorganisms. A total of 39 operational taxonomic units (OTUs) were obtained from the three samples and sequenced from 384 clones. Sequence data and phylogenetic analyses showed that two dominant clones (JYC-1B, JYC-1D) in sample JYC-1 represented 69.5%...
Tipo: Journal article
Palavras-chave: Acid mine drainage; Amplified ribosomal DNA restriction analysis; Microbial communities.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000100001

Examining Point-Nonpoint Trading Ratios for Acid Mine Drainage Remediation with a Spatial-Temporal Optimization Model
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Zhao,   Xiaobing; Fletcher,   Jerald J.
A trading ratio is required for water quality trading that involves nonpoint sources to compensate for the difficulty of determining nonpoint loadings, the stochastic characteristics of nonpoint loadings, and the uncertainty inherent in nonpoint source pollution control strategies. Compensating for risk and uncertainty is one of the primary justifications that a trading ratio greater than one is commonly considered. However, the appropriate specific value of a trading ratio remains unclear because of qualitative differences between point and nonpoint sources. This study addresses a growing concern with the analytical underpinnings of point/nonpoint trading ratios in water quality trading programs. This paper considers a basic spatial-temporal optimal...
Tipo: Conference Paper or Presentation
Palavras-chave: Point-nonpoint water quality trading; Trading ratio; Acid mine drainage; Spatial-temporal optimization; Environmental Economics and Policy.
Ano: 2005
URL: http://purl.umn.edu/19231

Preliminary evaluation of acid mine drainage in Minas Gerais State, Brazil
Provedor de dados: Revista Brasileira de Ciência do Solo
Autores: Mello,Jaime Wilson Vargas de; Dias,Luiz Eduardo; Daniel,Alfredo Mucci; Abrahão,Walter Antonio Pereira; Deschamps,Eleonora; Schaefer,Carlos Ernesto G.Reynald.
Mining in the State of Minas Gerais-Brazil is one of the activities with the strongest impact on the environment, in spite of its economical importance. Amongst mining activities, acid drainage poses a serious environmental problem due to its widespread practice in gold-extracting areas. It originates from metal-sulfide oxidation, which causes water acidification, increasing the risk of toxic element mobilization and water resource pollution. This research aimed to evaluate the acid drainage problem in Minas Gerais State. The study began with a bibliographic survey at FEAM (Environment Foundation of Minas Gerais State) to identify mining sites where sulfides occur. Substrate samples were collected from these sites to determine AP (acidity potential) and NP...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acid mine drainage; Acid-base accounting; Sulfide minerals.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832006000200016

Importance of water quality on plant abundance and diversity in high-alpine meadows of the Yerba Loca Natural Sanctuary at the Andes of north-central Chile
Provedor de dados: Revista Chilena de Historia Natural
Autores: GINOCCHIO,ROSANNA; HEPP,JOSEFINA; BUSTAMANT,ELENA; SILVA,YASNA; DE LA FUENTE,LUZ MARÍA; CÁSALE,JEAN FRANCOIS; DE LA HARPE,JEAN PAUL; URRESTARAZU,PAOLA; ANIC,VINKA; MONTENEGRO,GLORIA.
Porphyry Cu-Mo deposits have influenced surface water quality in high-Andes of north-central Chile since the Miocene. Water anomalies may reduce species abundance and diversity in alpine meadows as acidic and metal-rich waters are highly toxic to plants The study assessed the importance of surface water quality on plant abundance and diversity in high-alpine meadows at the Yerba Loca Natural Santuary (YLNS), central Chile (33°15' S, 70°18' W). Hydrochemical and plant prospecting were carried out on Piedra Carvajal, Chorrillos del Plomo and La Lata meadows the growing seasons of 2006 and 2007. Direct gradient analysis was performed through canonical correspondence analysis (CCA) to look for relationships among water chemistry and plant factors. High...
Tipo: Journal article
Palavras-chave: Porphyry deposits; Phytotoxicity; Plant diversity; Acid mine drainage; Copper toxicity.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000400003

Geochemistry of acid mine drainage from a coal mining area and processes controlling metal attenuation in stream waters, southern Brazil
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: CAMPANER,VERIDIANA P.; LUIZ-SILVA,WANILSON; MACHADO,WILSON.
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...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acid mine drainage; Coal; Metals; Water quality.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200539