scholarly journals Influence of Extremophiles on the Generation of Acid Mine Drainage at the Abandoned Pan de Azúcar Mine (Argentina)

2021 ◽  
Vol 9 (2) ◽  
pp. 281
Author(s):  
Josefina Plaza-Cazón ◽  
Leonardo Benítez ◽  
Jésica Murray ◽  
Pablo Kirschbaum ◽  
Edgardo Donati
Keyword(s):  
Acid Mine Drainage ◽  
Molecular Analysis ◽  
Mine Drainage ◽  
High Potential ◽  
Microbial Consortia ◽  
Ramsar Site ◽  
Acid Generation ◽  
High Dilutions ◽  
Sulfur Oxidizing ◽  
Ecotoxicological Effect

The risk of generation of acid drainages in the tailings of the Pan de Azúcar mine that closed its activities more than three decades ago, was evaluated through biooxidation studies using iron- and sulfur-oxidizing extremophilic leaching consortia. Most of tailings showed a high potential for generating acid drainage, in agreement with the results from net acid generation (NAG) assays. In addition, molecular analysis of the microbial consortia obtained by enrichment of the samples, demonstrated that native leaching microorganisms are ubiquitous in the area and they seemed to be more efficient in the biooxidation of the tailings than the collection microorganisms. The acid drainages detected at the site and those formed by oxidation of the tailings, produced a significant ecotoxicological effect demonstrated by a bioassay. These drainages, even at high dilutions, could seriously affect a nearby Ramsar site (Laguna de Pozuelos) that is connected to the Pan de Azúcar mine through a hydrological route (Cincel River).

scholarly journals Competitive Growth of Sulfate-Reducing Bacteria with Bioleaching Acidophiles for Bioremediation of Heap Bioleaching Residue

2020 ◽  
Vol 17 (8) ◽  
pp. 2715 ◽  
Author(s):  
Aung Kyaw Phyo ◽  
Yan Jia ◽  
Qiaoyi Tan ◽  
Heyun Sun ◽  
Yunfeng Liu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Sulfate Reducing Bacteria ◽  
Sulfide Minerals ◽  
Sulfate Reducing ◽  
Heap Bioleaching ◽  
Waste Rocks ◽  
Sulfur Oxidizing ◽  
Reducing Bacteria

Mining waste rocks containing sulfide minerals naturally provide the habitat for iron- and sulfur-oxidizing microbes, and they accelerate the generation of acid mine drainage (AMD) by promoting the oxidation of sulfide minerals. Sulfate-reducing bacteria (SRB) are sometimes employed to treat the AMD solution by microbial-induced metal sulfide precipitation. It was attempted for the first time to grow SRB directly in the pyritic heap bioleaching residue to compete with the local iron- and sulfur-oxidizing microbes. The acidic SRB and iron-reducing microbes were cultured at pH 2.0 and 3.0. After it was applied to the acidic heap bioleaching residue, it showed that the elevated pH and the organic matter was important for them to compete with the local bioleaching acidophiles. The incubation with the addition of organic matter promoted the growth of SRB and iron-reducing microbes to inhibit the iron- and sulfur-oxidizing microbes, especially organic matter together with some lime. Under the growth of the SRB and iron-reducing microbes, pH increased from acidic to nearly neutral, the Eh also decreased, and the metal, precipitated together with the microbial-generated sulfide, resulted in very low Cu in the residue pore solution. These results prove the inhibition of acid mine drainage directly in situ of the pyritic waste rocks by the promotion of the growth of SRB and iron-reducing microbes to compete with local iron and sulfur-oxidizing microbes, which can be used for the source control of AMD from the sulfidic waste rocks and the final remediation.

Characterization of heterotrophic iron and sulfur-oxidizing bacteria from acid mine drainage in Sarcheshmeh copper mine, Iran

2019 ◽  
Vol 147 ◽  
pp. 264-272 ◽  
Author(s):  
Mehdi Hassanshahian ◽  
Shiva Toorani ◽  
Rasoul Roghanian ◽  
Giti Emtiazi ◽  
Maria Genovese
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Copper Mine ◽  
Acid Mine ◽  
Sarcheshmeh Copper Mine ◽  
Sulfur Oxidizing ◽  
Sulfur Oxidizing Bacteria

scholarly journals GIS and RS-Based Analysis of Water Pollution Potential Caused by Acid Mine Drainage in Samarinda, Indonesia

2021 ◽  
Vol SI (11) ◽  
pp. 5-13
Author(s):  
Tito Latif INDRA ◽  
Regina Putri AMALIA ◽  
Astrid DAMAYANTI
Keyword(s):  
Water Pollution ◽  
Acid Mine Drainage ◽  
Large Scale ◽  
Mine Drainage ◽  
High Potential ◽  
Water Bodies ◽  
Gis And Remote Sensing ◽  
Acid Mine ◽  
East Kalimantan ◽  
Void Distribution

Large-scale mining activity is the major environmental issue, including water pollution caused by Acid Mine Drainage (AMD). Samarinda, which is located in the province of East Kalimantan, Indonesia, has open pits and acid contributing land as a source of AMD pollutants. The potential AMD pollution can be assessed by utilizing Geographic Information System (GIS) and Remote Sensing (RS), which are considered reliable tools for measuring, mapping, monitoring, and model making for an area. The variables used in this research are void distribution, land cover, soil type, rainfall, topography, water body, and groundwater. The integration of these variables is used to analyze the potential of AMD pollution to water bodies by acid contributing land. Meanwhile, the void distribution and groundwater integration data are used to analyze the potential of AMD pollution to groundwater by voids. The overlay method is employed to analyze the potential spatial patterns of AMD pollution in the study area. The results show the high potential of AMD pollution to water bodies, specifically in the districts of Samarinda Utara, Palaran, and Sungai Kunjang. The high potential of AMD pollution to groundwater is found in the south delineation area, namely Palaran, Loa Janan Hilir, and Samarinda Seberang districts, with low and medium groundwater depth categories (20 - 70 and 50 - 150 MBGL). The spatial pattern of AMD pollution was random with the geometric arrangement of AMD pollution in the form of clusters.

scholarly journals Natural oxidation of coal tailings from Middelburg area (South Africa), and impact on acid-generation potential

2020 ◽  
Vol 120 (11) ◽  
Author(s):  
N. van Wyk ◽  
E. Fosso-Kankeu ◽  
D. Moyakhe ◽  
F.B. Waanders ◽  
M. Le Roux ◽  
...  
Keyword(s):  
South Africa ◽  
Acid Mine Drainage ◽  
Coal Mine ◽  
Mine Tailings ◽  
Mine Drainage ◽  
Acid Base ◽  
Acid Base Accounting ◽  
Acid Mine ◽  
Acid Generation ◽  
Coal Tailings

SYNOPSIS The aim of this study was to determine the acid-generating potential of coal mine tailings located in the Middelburg area, South Africa, using conventional assessment techniques. Four coal-tailing samples were collected from different layers of a coal-tailing pile. The acid-base accounting (ABA), acid-buffering characteristic curve (ABCC), and net acid generation (NAG) methods were used in conjunction with a mineralogical investigation to assess the potential of acid mine drainage (AMD) formation from the tailings. The results showed that the top layer of the pile, which was exposed to the atmosphere, was most likely to form AMD, exhibiting the lowest paste pH (2.5) and ABA of zero kg H2SO4 per ton. The ABA results were compared to ABCC results and mineralogical calculations to confirm the findings. The results from the ABCC test and calculations based on mineralogy indicated that the ABA method overestimates the effective or readily available acid neutralization capacity (ANC) and the true MPA of each sample; only three of the four samples could therefore be classified as acid-forming, but with low acid-generating capacity. Although the findings show that the top layer of the coal tailings in the Middelburg area is most likely to form AMD, it is important for future studies to further investigate the kinetics of acid formation. Keywords: acid mine drainage, acid-base accounting, mineralogy, net acid generation, coal mine tailings.

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