Characterization of iron-metabolizing communities in soils contaminated by acid mine drainage from an abandoned coal mine in Southwest China

Effects of long-term discharge of acid mine drainage from abandoned coal mines on soil microorganisms: microbial community structure, interaction patterns, and metabolic functions

“…It can be seen that the dominant phylum in all samples was Proteobacteria, which accounted for 54.22% of the total bacterial reads in group M (31.91-69.66% per sample), while in the group S, it was only 29.26%. The percentage of Proteobacteria in the soil increased signi cantly after AMD contamination, which is consistent with the ndings of other scholars(Gao et al 2019). In addition, we found that although Proteobacteria were the most abundant phylum in both groups M and S, there were signi cant differences in composition at the lower taxonomic levels.…”

“…This indicates that long-term scouring and erosion of AMD from abandoned coal mines has led to severe acidi cation and contamination of soils in the runoff area (Zhang et al 2013a). Statistical analysis showed that the pH of the contaminated soil was signi cantly lower (p < 0.001) compared to the reference group, while the total iron content (average 321.80 g/kg) was signi cantly higher, showing the physicochemical characteristics of typical AMD contamination (Gao et al 2019). The high total iron content in the contaminated soil may be due to the high concentration of iron ions in AMD, which generates secondary minerals such as Jarosite, Schwertmannite, Goethite deposited on the surface soil under the combined action of oxygen and microorganisms (Bao 2018).…”

“…The interactions between microbial populations in the samples were studied by co-occurrence network analysis with Networkx software. Interactions between "microbe-microbe" were calculated using Spearman correlation coe cients (Gao et al 2019). Positive and negative correlations may indicate mutualistic and competition relationship between microorganisms, respectively.…”

Application of a Fuzzy Logic Based Methodology to Validate the Hydrochemical Characterization and Determining Seasonal Influence of a Watershed Affected by Acid Mine Drainage

“…Acid mine drainage (AMD) is one of the main environmental problems caused by the oxidation of sulfide-rich deposits after their extraction, when they are exposed to oxygen, water and biological weathering. In many cases, mining waste can continue to affect the environment negatively for centuries after mine closure, contaminating the surrounding soil, surface water and groundwater [ 1 , 2 , 3 ]. Acid mine drainage is related to the oxidation of pyrite and other poly-metallic sulfides, resulting in an acid lixiviate with high concentrations of metals and metalloids.…”

Sulfate-rich wastewater treatment using an integrated anaerobic/aerobic biological system

“…AMD is an acid solution generated when sulfur minerals, present in both active and abandoned mine wastes, oxidize with oxygen and water (Delkash et al, 2015;Alcázar-Medina et al, 2020). The result is a leached agent that contains high quantities of sulfuric acid and metals, such as Mn, Cr, Cd, Cu, Zn, Pb, As, with the potential to contaminate surrounding environments (Gao et al, 2019).…”