Response of soil microbial activities and ammonia oxidation …
Soil samples in the Xikuangshan mining area were collected and subjected to high through-put sequencing of 16S rRNA and ITS1 to investigate bacterial and fungal communities, respectively, along an ...
اقرأ أكثرTracing Sulfate Source and Transformation in the …
The potential sources of SO 4 2− in coal mining areas include natural sources, such as the dissolution of gypsum, oxidation of sulfides (pyrite) and atmospheric precipitation [6,7,8], and anthropogenic sources, such as discharges of domestic and industrial wastewaters, the use of agricultural fertilizers, and coal mining activities [9,10,11].
اقرأ أكثرAcid Mine Drainage (AMD): causes, treatment and case studies
The reactions of acid generation are best illustrated by examining the oxidation of pyrite (FeS 2), which is one of the most common sulfide minerals. The first important reaction is the oxidation of the sulfide mineral into dissolved iron, sulfate and hydrogen: (1) FeS 2 + 7/2 O 2 + H 2 O → Fe 2+ + 2SO 4 2− + 2H +
اقرأ أكثرWater | Free Full-Text | Hydrochemical Characteristics of …
Underground reservoir technology can mitigate water shortage and pollution problems in water shortage coal mining areas and has a good application prospect. While still a new technology, the theory and method of underground reservoirs need to be improved. This research focused on the hydrochemical characteristics of mine water and …
اقرأ أكثرMitigating Risks in Coal Mining: Simulation-Based Strategy …
The oxidation zone is approximately 95 m wide. On the return side of the goaf, the oxygen concentration decreases to below 15% at a distance of 42 m from the …
اقرأ أكثرAntimony contamination in groundwater at the Xikuangshan mining area …
Elevated concentrations of antimony in environmental, biological and geochemical systems originating from natural and anthropogenic sources are of particular global concern. Sb mining and smelting activities are mainly responsible for most of the world's environmentally significant Sb contamination. Over 100-years mining and smelting …
اقرأ أكثرChanges in soil quality over time focusing on organic acid …
In many sandy coal mining areas, natural restoration plays a major role because of scarcity of water for irrigation, which makes artificial management and protection challenging. ... The SOM was analyzed using the potassium dichromate oxidation heating method. The soil AN was determined using the alkali solution-diffusion method, while the …
اقرأ أكثرO2 partitioning of sulfur oxidizing bacteria drives acidity and
The acidification of water in mining areas is a global environmental issue primarily catalyzed by sulfur-oxidizing bacteria (SOB). Little is known about microbial sulfur cycling in circumneutral ...
اقرأ أكثرBiogeochemistry of metal sulfide oxidation in …
Metal sulfi de oxidation is the only major sulfate-generat-. ing biogeochemical process on Earth. It is a process of major. environmental impact, causing acid rock drainage (ARD) or acid. mine ...
اقرأ أكثرManaging Water Quality in Mining Areas: Changing …
Abstract. Water is an important resource and a necessity for the mining and minerals processing industries. The mining and mineral-based industries extract water from groundwater, streams, rivers, and lakes, for mineral processing, dust suppression, and slurry transport. When the available water in mines is in excess, it can cause flooding in ...
اقرأ أكثرResponse of soil microbial activities and ammonia oxidation …
Response of soil microbial activities and ammonia oxidation potential to environmental factors in a typical antimony mining area J Environ ... The microbial characteristics were dissimilar among sampling points at different locations from the mining area according to hierarchical cluster analysis. The correlation analysis indicated that ...
اقرأ أكثرPrediction of acid mine drainage: Where we are
The accurate prediction of acid mine drainage and contamination generation must further consider the following aspects: i) an accurate sampling strategy, ii) the …
اقرأ أكثرSignature of oxygen and sulfur isotopes of sulfate in ground …
In mining areas, oxidation of sulfide minerals and organic sulfur compounds (e.g. in coal mines) are often predominant, while in surrounding areas mineralization of soil organic sulfur, dissolution of primary sulfate minerals such as gypsum and anhydrite, use of fertilizer, or atmospheric sulfate deposition constitute sources of sulfate that ...
اقرأ أكثر(PDF) Experimental study on the oxidation kinetics of coal in …
Oxidation of crushed remains of coal in the mining area still occurs even at deficient oxygen concentration (Deng et al. 2018b;Jin et al. 2015), which is mainly due to the adsorption of coal pores ...
اقرأ أكثرGenome Mining of Oxidation Modules in trans …
In this work, genome mining focusing on architecturally diverse oxidation modules in trans-AT PKSs led us to the culturable plant symbiont Gynuella sunshinyii, which harbors two distinct modules in one orphan PKS. The PKS product was revealed to be lobatamide A, a potent cytotoxin previously only known from a marine tunicate.
اقرأ أكثرTechnical Document: Acid Mine Drainage Prediction
Acid is generated at mine sites when metal sulfide minerals are oxidized. Metal sulfide minerals are present in the host rock associated with most types of metal mining activity. …
اقرأ أكثرIncrease in fluoride concentration in mine water in Shendong mining …
The abundance and spatial distribution of F-in the mine water of the Shendong mining area were determined.. The hydrogeochemical behaviours and formation mechanisms that further elevate F-levels in mine water during mining activities were evaluated.. The hydrogeochemical processes of mine water at high F-concentration …
اقرأ أكثرImpact of decades long mining on weathering | Arabian …
Environmental contamination and landscape alteration are well known adverse impacts caused by mines. However, the impact of mines on the weathering are less studied and considered minimal in nature. The destruction and disturbances caused by mines spread in wider area suggesting probable influence on the weathering. Thus, the …
اقرأ أكثرResponse of soil microbial activities and ammonia oxidation …
In this study, the PAO rate and the abundance of AOB and AOA were lower in the soil environment near the mining area, indicating that metal(loid) pollution caused …
اقرأ أكثرMigration and transformation of arsenic: Contamination …
Oxidation. The release of As-based toxicity from realgar following physical transformation processes is limited because the products of that processes are not the As (III) and As (V) forms of higher toxicity. ... In the most polluted village of the Heshan mining area, the prevalence rate of chronic As poisoning can reach 36.5%, making Heshan ...
اقرأ أكثرA review of acid mine drainage: Formation mechanism, …
With the participation of water and oxygen, pyrite forms Fe 2+ and H 2 SO 4, as shown in the reaction Eq. (1).This process is the key to the formation of AMD. Mineral composition, environmental microbial activity, and external conditions such as oxygen and water determine the rate of pyrite oxidation and H + release. In an environment with …
اقرأ أكثرEcological drivers of methanotrophic communities in
The areas are influenced by subtropical humid climate, with 1200–1400 mm of annual average rainfall and 17 °C of annual mean temperature. Historical discharges from two Hg mining operations had led to heavy metal pollution in these areas (Feng and Qiu, 2008). Soil samples were obtained from 24 sites along downstream of the mining sites ...
اقرأ أكثرAssessment of air pollution around coal mining area: …
Oxidation of SO 2 in the atmosphere can occur homogeneously in the gas phase and aqueous phase ... During winter, sites in or near to coal mining areas (Ena, Dhansar, Bhagatdih and Bastacolla) showed heavy pollution (index value was 76–100), while during summer Ena and Dhansar sites were heavily polluted ...
اقرأ أكثرHydrology | Free Full-Text | Iron and Manganese …
The mobility of a metal in mining-impacted sediments is determined by the environmental conditions that influence the metal's oxidation state and bonding environment. Coeur d'Alene Lake, USA, …
اقرأ أكثرCharacteristics of labile organic carbon fractions under …
Yanzhou coalfield covers an area of 258 km 2, and is fourth largest coal producer and one of the eight major coal mining regions in China. It is a typical HGCB, underground coal mining has led to large-scale land subsidence and flooding, and the water area has increased from 474.47 to 1471.23 hm 2 from 1985 to 2015(Xiao et al., …
اقرأ أكثرInvestigation of the kinetics of spontaneous combustion of …
In recent years, with the increase of mining activities in this coal mining area, there is still a risk of CSC in this mining area. Figure 1 Location of the study area.
اقرأ أكثر(PDF) Potential of Chemolitotrophic Bacteria From Gold Mining Area …
PCR area in doing sulfur oxidation as one of process products were detected by 1.5 % agarose gel in gold mining.The chemolithoauotrophic bac- electrophoresis. 527 Nur Lu'lu Fitriyani et al. / Biosaintifika 10 (3) (2018) 526-532 Sequencing and identification on of quartz in gold mine area at peak d=3,34 DNAproductfrom amplification was sent Å.
اقرأ أكثرOxidation
Mineral oxidation is a chemical reaction, which takes place in a mineral upon exposure to oxygen, resulting in a change in the chemical composition. It takes place through weathering, which is a breakdown of minerals, rocks, and soil through contact with biota, water, and atmosphere. The chemical oxidation of a number of metals occurs in …
اقرأ أكثرArsenic oxidation and immobilization in acid mine drainage in karst areas
For example, high pH in karst mining areas promotes the oxidation of Fe(II) and generation of⋅OH, leading to As(III) oxidation and immobilization [246, 247]. Zhang et al. [231] found that the ...
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