Characteristics of leaching of heavy metals from low-sulfur coal gangue under different conditions

AbstractCoal gangue is the main pollution source of mining areas. When coal gangue is stacked and recycled, the heavy metal elements contained in it are released by natural weathering and leaching, which causes damage to the surrounding ecological environment. In this study, the leaching and precipitation characteristics of heavy metals in low-sulfur coal gangue under different environmental conditions were simulated by indoor dynamic leaching experiments, which provided a theoretical basis for environmental restoration of the mining area. The conclusions are as follows: higher heavy metal content in low-sulfur coal gangue is associated with greater, leaching of heavy metals; acidic conditions promote the release of heavy metals in low-sulfur coal gangue; and more precipitation is associated with better release of heavy metals from the low-sulfur coal gangue.

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Study on soil pollution caused by heavy metals in coal mining areas and vegetation restoration in surrounding areas

10.21203/rs.3.rs-360154/v1 ◽

2021 ◽

Author(s):

Xun Wang

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Coal Mining ◽

Metal Pollution ◽

Heavy Metal Pollution ◽

Soil Layer ◽

Mining Area ◽

Vegetation Restoration ◽

Mining Areas ◽

Ligustrum Lucidum

Abstract In this study, taking a coal mining area as an example, three vegetation restoration modes were designed: Populus L., Ligustrum lucidum Ait., and Amygdalus persica L., and soil and plant samples were collected to determine and evaluate the heavy metals. It was found that all the three modes were effective in eliminating heavy metal pollution in the soil, especially Populus L. and Ligustrum lucidum Ait.; in the soil layer at a depth of 0–20 cm, the content of Cd was the lowest (2.68 mg/kg) in Populus L., and the content of Cr and Pb was the lowest (58.64 mg/kg and 95.36 mg/kg) in Ligustrum lucidum Ait., which was significantly lower than that in the bare land. The evaluation results demonstrated that the pollution under Populus L. and Ligustrum lucidum Ait. modes was moderate. In the aspect of the heavy metal content in plants, the content of Cd was the lowest, and the content of Cr and Pb was high. In the same plant, the content of heavy metals in the leaf was the lowest, followed by the stem and root. The experimental results show that the vegetation restoration mode can relieve the heavy metal pollution, which makes some contributions to solve the ecological restoration problem in coal mining areas.

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Heavy Metal Accumulation Affects the Structure of Microorganisms and Increases Abundance of Resistance Genes in Rare Earth Mining Areas

10.21203/rs.3.rs-639794/v1 ◽

2021 ◽

Author(s):

Minjie Chen ◽

Xiaoru Jiang ◽

Zhansheng Mi ◽

Yafei Li ◽

Zhe Wang ◽

...

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Rare Earth ◽

Microbial Community ◽

Resistance Genes ◽

Metal Pollution ◽

Heavy Metal Pollution ◽

High Throughput Sequencing ◽

Mining Area ◽

Mining Areas

Abstract Background Environmental pollution from rare earth mining areas is of great concern, but the impact on microbial ecology and genomics has received little attention. In this study, the relationship between heavy metals and soil microbial community in the northern rare earth mining area was explored. Methods In order to study the detoxification mechanisms of heavy metals by microorganisms in this typical rare earth mining area, the study area was divided into three parts (mining area, residential area and control area). Analysis of microbial community diversity, structure and functional abundance using high-throughput sequencing techniques. Analysis of the effect of heavy metal pollution on the abundance of heavy metal resistance genes in soils of different regions using real-time fluorescence quantitative PCR. Results The results showed that the heavy metal pollution rules: mining area > residential area > control area. Under the condition of long-term heavy metal pollution, the original microbial community composition was changed, and the species richness and evenness of soil in mining areas were higher than that in residential areas. The high-throughput sequencing analysis showed that existed metal-resistant microbial communities such as Actinobacteria, Proteobacteria, Korarchaeota and so on under the stress of heavy metal. High concentrations of heavy metals can inhibit the activities of catalase and sucrase. According to Tax4Fun function prediction analysis, heavy metal accumulation increased the ABC transporter protein in microbial function. The results of fluorescence quantification experiments also demonstrated that the abundance of heavy metal resistance genes, czcA, czcB, czcC and czcD, encoding ABC transporter proteins, increased with increasing heavy metal concentrations. Conclusions In conclusion, the accumulation of heavy metals not only changed the soil physicochemical properties and the microbial community structure, but also decreased soil enzyme activities and increased the abundance of resistance genes, which activated the detoxification mechanism of heavy metals. which provided a reference for future ecological remediation.

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Mycoremediation to Remove Heavy Metal Pollution in Post-Mining Areas for Farmland Utilization

Indonesian Bulletin of Animal and Veterinary Sciences ◽

10.14334/wartazoa.v28i1.1785 ◽

2018 ◽

Vol 28 (1) ◽

pp. 41 ◽

Cited By ~ 3

Author(s):

Riza Zainuddin Ahmad

Keyword(s):

Heavy Metals ◽

Saccharomyces Cerevisiae ◽

Heavy Metal ◽

Aspergillus Flavus ◽

Health Problem ◽

Industrial Area ◽

Mining Area ◽

Mining Areas ◽

Cost Efficient ◽

Heavy Metal Waste

The agriculture land including farmland is decreasing caused by conversion to industrial area and settlement, therefore post-mining area is used to be farmlands. The utilization of post-mining area causes serious health problem in animals and humans due to heavy metal waste pollution (Ag, As, Cd, Co, Cr, Cu, Hg, Ni, and Pb). Efforts to overcome the pollution of heavy metals on farms can be carried out by preventing and controlling waste in post-mining and industry areas. There are several mycoremediation methods to recover heavy metal polluted land such as biosorption, bioaccumulation, bioprecipitation, bioreduction, and bioleaching. Mycoremediation is a process to remove pollutants or heavy metals from soil using potential fungi (Aspergillus flavus, Penicillium sp, Fusarium sp, Saccharomyces cerevisiae). Mycoremediation is chosen due to economical cost, efficient, and environmentally friendly.

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Assessment of soil heavy metal pollution in a former mining area – before and after the end of mining activities

Soil and Water Research ◽

10.17221/107/2016-swr ◽

2017 ◽

Vol 12 (No. 4) ◽

pp. 229-236 ◽

Cited By ~ 11

Author(s):

L. Demková ◽

T. Jezný ◽

L. Bobuľská

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Contamination Factor ◽

Mining Area ◽

Pollution Load Index ◽

Mining Activities ◽

Pollution Load ◽

Limit Values ◽

Mining Areas ◽

Factor C

Toxicity and persistence of heavy metals, which are accumulated in the environment as the result of diverse industrial activities, represent serious environmental problem worldwide. The intense mineral extraction in mining areas has produced a large amount of waste material and tailings, which release toxic elements to the environment. The aim of the study was to determine in two time horizons (1997, 2015) the heavy metal contents of samples derived from ten sampling sites located in the former mining area of Central Spiš (Slovakia). In order to compare the level of contamination, the contamination factor (Cif), degree of contamination (Cd), and pollution load index (PLI) were computed. Spearman’s correlation coefficient was used in order to detect the relationships among heavy metals. A serious situation was found for Hg, Zn, and Cd, which exceeded limit values at all sampling sites within both studied years. In 1997, the average values of contamination factor have shown very high contamination with all studied heavy metals, and moderate contamination with Co. In 2015, the study area was classified as very highly contaminated with As, Hg, Zn, Cu, considerably contaminated with Ni, Cr, Pb, and Cd, while Co contamination was not detected. Since 1997 till 2015 the pollution load index decreased by about 38%, nevertheless even then almost all sampling sites were classified as heavily polluted. Despite the fact that mining activities were stopped or limited at the beginning of the 21st century, the presence of heavy metals in soils remains at a serious level. The high level of contamination is a result of heavy metal persistence and non-biodegradability.

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Analysis of Heavy Metal in Water used for Irrigation, Soil and Some Vegetables grown around Tin Mine Areas of Heipang District, Barkin-Ladi Local Government of Plateau State

Earthline Journal of Chemical Sciences ◽

10.34198/ejcs.2119.111119 ◽

2019 ◽

pp. 111-119

Author(s):

Agustina Onyebuchi Ijeomah ◽

Rebecca Ngoholve Vesuwe ◽

Bitrus Pam

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Food Safety ◽

Safety Concern ◽

Human Beings ◽

Green Beans ◽

Green Pepper ◽

Transfer Factors ◽

Mining Areas ◽

Plateau State

Vegetables growing in mining areas have become a serious food safety concern because of the high levels of heavy metals always associated with mining. In this study, water used for irrigation, soil, cabbage, green pepper and green beans grown in tin mine areas of Heipang District, Barkin-Ladi LGA of Plateau State were analyzed for lead, cadmium and zinc, using Atomic Absorption Spectrophotometer (AAS). The concentrations of the heavy metals in water, soil, vegetables were all in the order Pb, >> Cd > Zn. In the vegetables, the order was: Pb → cabbage > green beans > green pepper; Cd → green beans > cabbage > green pepper; Zn → cabbage > green pepper = green beans. The transfer factors for all the metals (heavy metal in plant / heavy metal in soil) ranged from 0.95 to 1.48. There were high levels of Pb and Cd in all the vegetables, which may be attributed to the metals in the water used for irrigation. Whilst the concentration of Zn in all the samples were lower than recommended limits, the levels of Pb and Cd in the water, soil and vegetables were higher than the WHO/FEPA standard recommended limits reported for vegetables. The Cd concentrations of the vegetables also exceeded the tolerance thresholds for animals and human beings and therefore consumption of vegetable from the area would endanger the health of the population.

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Research on heavy metal level and co-occurrence network in typical ecological fragile area

Journal of Environmental Health Science and Engineering ◽

10.1007/s40201-021-00625-w ◽

2021 ◽

Author(s):

Yiwei Zhao ◽

Liangmin Gao ◽

Fugeng Zha ◽

Xiaoqing Chen ◽

Xiaofang Zhou ◽

...

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Human Factors ◽

Human Life ◽

Mining Area ◽

Parent Material ◽

Control Value ◽

Pollution Levels ◽

Soil Parent Material ◽

Sampling Points

AbstractDue to the special sensitivity of typical ecologically fragile areas, a series of human life, mining, and other activities have a greater impact on the environment. In this study, three coal mines in Ordos City on the Loess Plateau were selected as the study area, and the pollution levels of heavy metals in the area were studied by measuring As, Hg, Cr, Cd, Cu, Ni, and Pb in the soil of 131 sampling points. Combined with the concept of “co-occurrence network” in biology, the level of heavy metals in soil was studied using geostatistics and remote sensing databases. The results showed that the concentrations of Hg, Cr, Ni, Cu, and Pb in more than half of the sampling points were higher than the local environmental background value, but did not exceed the risk control value specified by China, indicating that human factors have a greater influence, while Cd and As elements are mainly affected Soil parent material and human factors influence. Heavy metal elements have nothing to do with clay and silt but have an obvious correlation with gravel. Cd, Pb, As and Ni, Cd, Cr are all positively correlated, and different heavy metals are in space The distribution also reflects the autocorrelation, mainly concentrated in the northeast of the TS mining area and the middle of the PS mining area.

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Heavy metal composition of maize and tomato grown on contaminated soils

Open Agriculture ◽

10.1515/opag-2018-0046 ◽

2018 ◽

Vol 3 (1) ◽

pp. 414-426

Author(s):

A.O. Adekiya ◽

A.P. Oloruntoba ◽

S.O. Ojeniyi ◽

B.S. Ewulo

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Contaminated Soils ◽

Heavy Metal Contamination ◽

Mining Area ◽

Atomic Absorption Spectrophotometry ◽

Toxic Heavy Metals ◽

Mining Site ◽

Solanum Lycopersicum L ◽

Sources Of Pollution

Abstract The study investigated the level of heavy metal contamination in plants {maize (Zea mays) and tomato (Solanum lycopersicum L.)} from thirty soil samples of three locations (Epe, Igun and Ijana) in the Ilesha gold mining area, Osun State, Nigeria. Total concentrations of As, Cd, Co, Cr, Cu, Ni, Pb and Zn were determined using atomic absorption spectrophotometry. Spatial variations were observed for all metals across the locations which was adduced to pH and the clay contents of the soils of each location. The results showed that heavy metals are more concentrated in the areas that are closer to the mining site and the concentrations in soil and plants (maize and tomato) decreased with increasing perpendicular distance from the mining site, indicating that the gold mine was the main sources of pollution. The mean concentrations of heavy metals in plants (tomato and maize) samples were considered to be contaminated as As, Cd and Pb respectively ranged from 0.6 - 2.04 mg kg-1, 0.8 - 5.2 mg kg-1, 0.8 - 3.04 mg kg-1 for tomato and respectively 0.60 - 2.00 mg kg-1, 1.50 - 4.60 mg kg-1 and 0.90 - 2.50 mg kg-1 for maize. These levels exceeded the maximum permissible limits set by FAO/WHO for vegetables. In conclusion, monitoring of crops for toxic heavy metals is essential for food safety in Nigeria.

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The content of copper and heavy metals in the multilayer soil mud from the Buchim lake under the Buchim mine's waste dump, Republic North Macedonia

Tehnika ◽

10.5937/tehnika2003297s ◽

2020 ◽

Vol 75 (4) ◽

pp. 297-304

Author(s):

Todor Serafimovski ◽

Goran Tasev ◽

Trajce Stafilov

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Porphyry Copper ◽

Contamination Factor ◽

Pollution Load Index ◽

Pollution Load ◽

Mining Areas ◽

Target Value ◽

Standard Values ◽

Almost All

The intense mineral extraction in mining areas during the last several decades has produced a large amount of waste material and tailings, which release toxic elements to the environment. The aim of the study was to determine in two vertical profiles/sections (1 and 2) the heavy metal contents of samples derived from six samples, three from each section located in the porphyry copper mine Buchim area, Republic North Macedonia. The results have been compared to new Dutchlist (DL) and Kabata-Pendias (KP) standards and the following was concluded: As values ranged 14.985÷60.131 mg kg-1 with 4 samples above the target value of the DL (29 mg kg-1 As) and 6 above standard values given in KP value (5 mg kg-1 As), in that context Co values ranged 11 ÷57 mg kg-1 with 6 values above the target value of the DL (9 mg kg-1 Co) and 5 above standard values given in KP value (12 mg kg-1 Co), Cr with range 29.32÷75.76 mg kg-1 with 6 over KP value (10 mg kg-1 Cr) and none above the target value of the DL (100 mg kg-1 Cr), Cu with range 2694÷6749 mg kg-1 with 6 samples above the target value of the DL (36 mg kg-1 Cu) and 6 above standard values given in KP value (20 mg kg-1 Cu), Ni with range 59.57÷105.98 mg kg-1 with 6 samples above the target value of the DL (35 mg kg-1 Ni) and 6 above standard values given in KP value (20 mg kg-1 Ni), Pb with range 27.06 ÷96.08 mg kg-1 with 1 sample above the target value of the DL (85 mg kg-1Pb) and 6 above standard values given in KP value (25 mg kg-1Pb), Zn with range 147÷273 mg kg-1 with 6 over target value of the DL (140 mg kg-1 Zn) and 6 above standard KP value (64 mg kg-1 Zn), V with range 34.44÷92.57 mg kg-1 with 5 over target value of the DL (42 mg kg-1 V) and one above KP value (90 mg kg-1 V).In order to compare the level of contamination, the contamination factor (𝐶𝑓 𝑖 ), degree of contamination (Cd), and pollution load index (PLI) were computed. Serious numbers were found for Cu, as, Zn, Co and Ni, which exceeded standard values at almost all samples from both vertical sections. Compared from section 1 and section 2, pollution load index increased by 13.43%, which in almost all samples was classified as heavily polluted to extremely polluted. The fact that mining activities at the Buchim Mine last for almost 40 years, the presence of heavy metals in soils at a serious level is understandable. The high level of contamination is a result of heavy metal persistence and non-biodegradability.

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Spatial Structure Features and Distributing Rules of Soil Heavy Metal Concentrations of Antimony Mining Area

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.253-255.1063 ◽

2012 ◽

Vol 253-255 ◽

pp. 1063-1068

Author(s):

Bo Zhi Ren ◽

Yi Zhou ◽

Zhou Hong Tao ◽

Lu Jing Cheng

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Spatial Structure ◽

Influence Factors ◽

Theoretical Models ◽

Mining Area ◽

Hunan Province ◽

Metal Concentrations ◽

Heavy Metal Concentrations ◽

Gis Tools

The spatial structure features and distributing rules of six heavy metals of antimony mining area, Cr, Cu, Ni, Zn, As, Cd and their main influence factors were researched using geostatistics combined with GIS tools. The results showed that: six kinds of heavy metal elements presented lognormal distribution. The mean of six kinds of heavy metal concentrations were higher than soil background value of Hunan province. Cd, Zn and Pb have a good correlation with each other, but the correlation between the rest elements was not obvious. The semivariogram theoretical models of six heavy metals in the study area were well fitted. The concentrations of Sb, As, Zn and Cd exhibited strong spatial autocorrelations, whereas the concentrations of Hg and Pb presented moderate spatial autocorrelations. The production activities of antimony smelter and dressing plant within the study area were the main factors for the high heavy metal concentrations of the study area.

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Preliminary Study of Heavy Metal (Zn, Pb, Cr, As, Cu, Cd) Contaminations on Different Soil Level from Post-Mining Bauxite Production for Aquaculture

E3S Web of Conferences ◽

10.1051/e3sconf/20184702008 ◽

2018 ◽

Vol 47 ◽

pp. 02008

Author(s):

Risandi Dwirama Putra ◽

Tri Apriadi ◽

Ani Suryanti ◽

Henky Irawan ◽

Tengku Said Raja'I ◽

...

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Grain Size ◽

Negative Impact ◽

Fine Sand ◽

Mining Area ◽

Grain Size Analysis ◽

Size Analysis ◽

The Mean ◽

Soil Level

Bauxite production and exploration give negative impact environmental modification and increasing concern pollution of heavy metals. One of an alternative to reduce the negative impact of bauxite post-mining production is by re-utilizing the abandoned bauxite land and necessary exploratory study to obtain the current environmental conditions primarily related to heavy metals in bauxite mining area. Soil and water quality samples from 5 (five) sites based on post-mining activities were used to determine concentration heavy metals of As, Cd, Pb, Zn, Cr, Cu from different soil level. They were also collected for grain size analysis including those of sand and mud percentages along with the mean, and sorting analysis. The mean grain size post-mining bauxite ranged between very fine sand to medium sand and had heterogeneous texture. The coarse grain size percentage increased towards the bottom of the soil. Total heavy metal contents for post-mining bauxite soils are 0,081 ppm, 0,245 to 0,471 ppm and 0,007 ppm for As, Pb and Cd respectively. Heavy metals for Cd, uniformly at every depth from soil level. On the other hand, Pb showed significance pattern, it was indicated every depth from soil level, the concentration of Pb was different.

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