Stabilization of the As-contaminated soil from the metal mining areas in Korea

2011 ◽  
Vol 34 (S1) ◽  
pp. 143-149 ◽  
Author(s):  
Myoung-Soo Ko ◽  
Ju-Yong Kim ◽  
Sunbeak Bang ◽  
Jin-Soo Lee ◽  
Ju-In Ko ◽  
...  
Keyword(s):  
Contaminated Soil ◽  
Metal Mining ◽  
Mining Areas

scholarly journals Effect of episodic rainfall on aqueous metal mobility from historical mine sites

2017 ◽  
Vol 14 (8) ◽  
pp. 469 ◽  
Author(s):  
Magaly Valencia-Avellan ◽  
Rebecca Slack ◽  
Anthony Stockdale ◽  
Robert John George Mortimer
Keyword(s):  
Water Chemistry ◽  
Management Strategies ◽  
Extreme Rainfall ◽  
Metal Mobility ◽  
Metal Mining ◽  
Extreme Rainfall Events ◽  
Specific Chemical ◽  
Complex Behaviour ◽  
Rainfall Events ◽  
Mining Areas

Environmental contextEpisodic extreme rainfall events may affect metal dynamics in rivers flowing within historical metal mining areas. This study provides an analysis of the water chemistry and geochemical processes associated with mobilisation of metals during episodic rainfall events. Findings could be used to assess the environmental quality of streams draining spoil waste areas with similar geochemical conditions, and thereby be used to guide future management strategies. AbstractThe increasing frequency and magnitude of episodic rainfall events may affect historical metal mining areas by remobilisation and deposition of metal-rich sediments and enhancing metal-rich run off, impacting river water quality. This study assesses the effects of episodic rainfall in a Carboniferous headwater catchment contaminated by historical Pb and Zn mining. Comprehensive hourly water chemistry measurements combined with modelling using PHREEQC, WHAM/Model VII and WHAM-FTOX were used in this assessment. For the episodic event, we measured flow increases from a baseline of 0.05 to 2.12 m3 s−1 at peak flow. Changes in metal concentration were most marked for ephemeral tributary, with Pb increasing from a baseline concentration of 55 μg L−1 to a peak of 576 μg L−1. Behaviour for Pb showed great affinity to form organic complexes or bind to colloidal Al and Fe oxides, whereas for Zn and the tributary flowing subsurface a more complex behaviour was observed. For example, the dissolution of secondary metal carbonate minerals (e.g. smithsonite (ZnCO3)) is likely constrained by higher concentrations of carbonate and bicarbonate derived from increased bedrock weathering under flow conditions induced by episodic rainfall. The abundance of secondary mineral sources and circumneutral pH present during episodic rainfall are important factors controlling the mobilisation of Pb and Zn. Furthermore, episodic rainfall events could enhance metal toxicity but there are aggravating and mitigating factors that depend on site-specific chemical changes. Overall, this study highlighted the complexity of metal mobility and toxicity during these events.

scholarly journals Simple and Equipment-Free Paper-Based Device for Determination of Mercury in Contaminated Soil

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 2004
Author(s):  
Hikmanita Lisan Nashukha ◽  
Jirayu Sitanurak ◽  
Hermin Sulistyarti ◽  
Duangjai Nacapricha ◽  
Kanchana Uraisin
Keyword(s):  
Contaminated Soil ◽  
Contaminated Soils ◽  
Soil Samples ◽  
Linear Calibration ◽  
Detection Zone ◽  
Free Paper ◽  
Mining Areas ◽  
Icp Ms ◽  
Imagej Software

This work presents a simple and innovative protocol employing a microfluidic paper-based analytical device (µPAD) for equipment-free determination of mercury. In this method, mercury (II) forms an ionic-association complex of tetraiodomercurate (II) ion (HgI42−(aq)) using a known excess amount of iodide. The residual iodide flows by capillary action into a second region of the paper where it is converted to iodine by pre-deposited iodate to liberate I2(g) under acidic condition. Iodine vapor diffuses across the spacer region of the µPAD to form a purple colored of tri-iodide starch complex in a detection zone located in a separate layer of the µPAD. The digital image of the complex is analyzed using ImageJ software. The method has a linear calibration range of 50–350 mg L−1 Hg with the detection limit of 20 mg L−1. The method was successfully applied to the determination of mercury in contaminated soil and water samples which the results agreed well with the ICP-MS method. Three soil samples were highly contaminated with mercury above the acceptable WHO limits (0.05 mg kg−1). To the best of our knowledge, this is the first colorimetric µPAD method that is applicable for soil samples including mercury contaminated soils from gold mining areas.

scholarly journals Comparative study on As(III) and As(V) adsorption by CO32--intercalated Fe/Mn-LDHs from aqueous solution

2021 ◽  
Author(s):  
Yan Tian ◽  
Guifeng Liu ◽  
Yingying Gao ◽  
Yaru Wang ◽  
Jun Zhang ◽  
...  
Keyword(s):  
Correlation Coefficients ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Metal Mining ◽  
Mining Areas ◽  
The People ◽  
Order Kinetic Model ◽  
Lead Zinc ◽  
Pseudo Second Order ◽  
Double Hydroxide

Abstract Arsenic pollution prevails in rivers and reservoirs in nonferrous metal mining areas, especially in lead–zinc mining areas, which affects the health of the people residing in such areas. Arsenic usually exists as As(III) and As(V) in water, and the adsorption of As(III) and As(V) changes with the type of adsorbent used. In this work, we report a novel adsorbent Fe/Mn–CO3-layered double hydroxide (Fe/Mn–CO3-LDH) composite that can efficiently remove both As(III) and As(V) from water. When the initial concentrations of As(III) and As(V) were 5, 10 and 50 mg/L, the adsorption capacities were 10.12–53.90 and 10.82–48.24 mg/g in the temperature range of 25–45 °C, respectively. The adsorption kinetics conformed well to the pseudo-second-order kinetic model, with all of the fitted correlation coefficients being above 0.998 for all the three initial concentrations (5, 10 and 50 mg/L) tested, suggesting a chemisorption-dominated process. The adsorption isotherms of As(III) and As(V) by Fe/Mn–CO3-LDHs conformed better to the Freundlich model than to the Langmuir one, indicating a heterogeneous reversible adsorption process. The theoretical maximum adsorption capacity increased with the increase in temperature. During adsorption, As(III) was partially converted to As(V), which was further interacted with intralayer anions. While the electrostatic attraction played an important role in the adsorption of As(V).

scholarly journals Geochemical Characterization and Trace-Element Mobility Assessment for Metallic Mine Reclamation in Soils Affected by Mine Activities in the Iberian Pyrite Belt

Geosciences ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 233
Author(s):  
Ramón Sánchez-Donoso ◽  
Mari Luz García García Lorenzo ◽  
José María Esbrí ◽  
Eva María García-Noguero ◽  
Pablo Higueras ◽  
...  
Keyword(s):  
Trace Elements ◽  
Mine Drainage ◽  
Mine Reclamation ◽  
Chemical Extraction ◽  
Water Drainage ◽  
Metal Mining ◽  
Geochemical Characterization ◽  
Mining Areas ◽  
Trace Element Mobility

The geochemical characterization of the mine deposits and soils in metal mining areas is essential in order to develop an effective mine reclamation strategy. The determination of total potentially toxic element (PTE) content, together with the application of chemical extraction procedures, can give insight into the behavior of contaminants after the application of different mine reclamation solutions, as well as identify the areas where urgent action is needed. This work presents a practical application to the evaluation of the pollution potential of trace elements in soils affected by mining activities, to be used in metallic mine reclamation. The PTE behavior was assessed by single extractions in order to simulate four environmental conditions: PTE mobility under rainfall conditions, acid mine drainage, reducing conditions, and plant uptake. The spatial distribution of contaminants in the study area was evaluated by determination of PTE total content in soil samples. Trace elements with high natural mobility, such as Zn, appeared concentrated at water and sediment discharge areas, while As, Pb, and Cu contents were higher near the mine wastes. The results obtained after the extractions suggested that the highest PTE content was extracted in the complexing–reducing medium, due to the dissolution of secondary sulfates and Fe3+ oxyhydroxides and the subsequent release of PTEs associated with those mineral phases. Reclamation strategies applied in the study area should promote efficient water drainage, infiltration, and subsuperficial water circulation in order to maintain oxidant conditions in the soil. The methodology applied in this study may constitute a valuable tool to define the geochemical constraints in metal mining areas, as well as help to develop appropriate mine reclamation solutions.

CREATION OF LOCAL CIRCUITS IN WATER TREATMENT SYSTEMS FOR MOBILE ENRICHMENT COMPLEXES

2021 ◽  
Vol 27 (7) ◽  
pp. 41-49
Author(s):  
V. Cherkasov ◽  
◽  
L. Shumilova ◽  
Keyword(s):  
Water Treatment ◽  
Thin Layer ◽  
Environmental Safety ◽  
Design Solution ◽  
Resource Saving ◽  
Metal Mining ◽  
Alluvial Deposits ◽  
Mining Areas ◽  
Equipment Operation ◽  
Local Circuits

The design solution for the use of hardware method in the formation of water treatment system in the technological processes of metalliferous sands processing by mobile beneficiation complexes is considered. The purpose of the study is to develop a system for separation of process water from the flows of hydro-mixture from washing sands at alluvial deposits. From the comparative analysis and evaluation of known systems of recycled technological water preparation in the mining and processing industry the thin-layer separation effect is adopted. The object of the research is a thin-layer device, the novelty of which is protected by patents of the Russian Federation. The layout variant of this device made in the form of a module on the principles of nodes unification taking into account peculiarities of equipment operation in extreme conditions without additional expenditures of energy, with formation of technological flexibility and transportability at the change of washing places is shown. Industrial researches of thin-layer devices at the objects of alluvial metal-mining in water-treatment systems for sand washing have shown high dividing ability of the formed hydrosand mixture with possible return up to 80-90 % of technological water into turnover. A qualitative and quantitative assessment of the proposed hardware version of building closed circuits with the formation of local contours of water flows is given. Such a hardware design of the separation process of epheline tailings from sand washing out of contact with the natural environment increases the environmental safety of the surrounding area in mining areas and refers to the resource-saving technology

scholarly journals Application of Biochar in the Remediation of Contaminated Soil with High Concentration of Lead and Zinc

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Xiaoming Zhao ◽  
Binbin Yang ◽  
Yuan Li ◽  
Dongqi Tang ◽  
Ke Xu ◽  
...  
Keyword(s):  
Contaminated Soil ◽  
Hunan Province ◽  
Control Group ◽  
High Concentration ◽  
Severe Problem ◽  
Treated Soil ◽  
Mining Areas ◽  
Lead And Zinc ◽  
Metal Immobilization ◽  
Heavy Metal Immobilization

Soil contamination in the Panjiachong lead and zinc mining areas has become a severe problem in Hunan Province, China. As the traditional stabilization technology comes with soil degradation, it is urgent to find a novel binder that is more eco-friendly. It has been proved that biochar can immobilize heavy metals, but limited research has been conducted on the contaminated soil with high concentration. In this study, 5%, 8%, and 10% biochar derived from the rice straw were used to remediate contaminated soil with high concentration of lead and zinc. Portland cement (PC) was adopted as the control group. The results showed that after 56 d curing, the biochar-treated soil had a neutral pH and EC value and higher soil fertility compared with the PC-treated soil. The results from the toxicity characteristic leaching procedure test indicated that the biochar is more effective than PC on heavy metal immobilization. Germination index (GI) value was used to evaluate the phytotoxicity of the treated soil; the GI values of treated soil with 8% and 10% biochar were both higher than 80%, while all the PC-treated groups failed to achieve this GI value, which indicated the potential revegetation is applicable for the biochar-treated soil.

scholarly journals Investigating the Working Efficiency of Typical Work in High-Altitude Alpine Metal Mining Areas Based on a SeqGAN-GABP Mixed Algorithm

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Ning Hua ◽  
He Huang ◽  
Xinhong Zhang
Keyword(s):  
High Altitude ◽  
Bp Neural Network ◽  
Evaluation Index System ◽  
Evaluation Index ◽  
Work Efficiency ◽  
Metal Mining ◽  
Mining Areas ◽  
Metal Mines ◽  
Design Variables ◽  
Bp Neural Network Model

Man-machine efficacy evaluations of typical work in the safe mining of high-altitude alpine metal mines are associated with fuzziness, multiple indexes, and large subjective components. This results in difficulties in the prediction of the typical work efficiency in high-altitude alpine metal mining areas. In this study, ergonomic theory was applied to establish the evaluation index system of typical work efficiency in high-altitude alpine metal mining areas by studying the cooperative relationship between operators, working machines, working environment, and design variables. First, we investigated the collaborative relationship between workers, operating machinery, operating environment, and design variables in order to establish the evaluation index system of typical work efficiency in high-altitude alpine metal mining areas. Second, principal component analysis (PCA) was integrated with the fusion entropy weight method to (i) analyze the coupling correlation and overlapping effects between the factors influencing efficiency at different altitudes and (ii) to determine the key influencing factors. Third, a model based on the sequence generative adversarial network genetic algorithm backpropagation (SeqGAN-GABP) hybrid algorithm was established to predict the trends in the operating efficiency of typical work types in high-altitude alpine metal mining areas. Finally, three high-altitude alpine metal mines in Xinjiang were selected as representative examples to verify the proposed framework by comparing it with other state-of the art models (multiple linear regression prediction model, backpropagation (BP) neural network model, and genetic algorithm back propagation (GA-BP) neural network model). Results determine the average relative error of each model as 2.74%, 1.97%, 1.29%, and 1.02%, respectively, indicating the greater accuracy of our proposed method in predicting the efficiency of typical work types in high-altitude alpine mining areas. This study can provide a scientific basis for the establishment of mining safety judgment standards in high-altitude alpine areas.

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