A study on soil basic characteristics, main microbial flora and typical metal fraction surrounding coal gangue dump in Xiangtan Hunan Province, south of China

He, Huan; Hong, FF; Tao, XX; Huang, Guodong; Leng, YW; Shao, Jian‐Fu; Zhao, Yaping; 赵屹东,

doi:10.1007/s12665-016-5340-z

Cited by 16 publications

(3 citation statements)

References 34 publications

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“…In our previous work, soil properties, microbial flora and metal profiling surrounding the coal gangue dump were investigated. The study shows that the metals from the coal gangue dump did affect the surrounding environment [38]. Bioleaching and the recovery of metals with microbes offer an alternative way to tender this solid waste.…”

Section: Metal Ions Concentrationsmentioning

confidence: 95%

Bioleaching Coal Gangue with a Mixed Culture of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans

Chen

Huang

et al. 2021

Minerals

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A mixed culture of A. ferrooxidans and A. thiooxidans isolated from a coal gangue dump was used to bioleach coal gangue in a column reactor to investigate the leaching of elements. The changes of metal ions (Fe, Mn and Cr) and sulfate in the leaching solution, elemental composition, mineral components and sulfur speciation of the coal gangue before and after bioleaching were analyzed by atomic absorption, anion chromatography, XRF, XRD and XPS. The results show that the mixed culture could promote the release of metal ions in coal gangue, with a leaching concentration of Fe > Mn > Cr. EC and Eh have significantly increased with the increase of metal ion concentrations in the leaching solution. XRF analyses show that the contents of Fe, Mn and S decreased in coal gangue after bioleaching. XRD results suggest that the bioleaching has impacts on minerals in coal gangue, particularly the Fe-containing components. XPS analyses show that sulfur speciation in the raw gangue samples was associated with sulfate, dibenzothiophene and pyrite sulfur. After continuous leaching by the mixed culture, the total sulfur, pyrite sulfur and sulfate sulfur in coal gangue decreased from 2.06% to 1.18%, 0.66% to 0.14% and 1.02% to 0.52%. The desulfurization rates of the pyrite and sulfate were 78.79% and 49.02 %. It is concluded that the mixed culture of these two microorganisms could effectively leach metals from coal gangue coupling with the oxidation of sulfide to sulfate. This study has provided fundamental information as a potential application in the recovery of valuable metals from coal gangue or environmental remediation related to gangue in the future.

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Section: Metal Ions Concentrationsmentioning

confidence: 95%

Bioleaching Coal Gangue with a Mixed Culture of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans

Chen

Huang

et al. 2021

Minerals

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“…The average values of K RSP for Pb and Cr in organic matter that was deposited in the lower water table in the WLF zone. He et al found that the abundance of bacteria and actinomycetes was significantly correlated (at the 0.05 level) with the mobility factor of heavy metals and the pH conditions of the soil surrounding a coal gangue dump [34]. Furthermore, Zeng et al found that the content of heavy metals absorbed by plants was positively correlated with the soil organic matter content [35].…”

Section: Potential Ecological Riskmentioning

confidence: 99%

Total nitrogen and pH-controlled chemical speciation, bioavailability and ecological risk from Cd, Cr, Cu, Pb and Zn in the water level-fluctuating zone sediments of the Three Gorges Reservoir

Liú²,

Lin

et al. 2017

Chemical Speciation & Bioavailability

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We investigated the distribution and chemical speciation of Cd, Cr, Cu, Pb and Zn in the water level-fluctuating (WLF) zone of the main stream (MS) and tributaries (ZX and MX) of the Three Gorges Reservoir. We evaluated the ecological risk and pollution level from heavy metals based on the Potential Ecological Risk Index (RI), Risk Assessment Code (RAC), and Ratio of Secondary Phase and Primary Phase (RSP). Our results indicated that the total and bio-available heavy metal contents were higher in the tributaries than in the MS. Moderate pollution from Cd and light pollution from Pb were observed both at the MS and ZX sites, whereas the MX site exhibited a pattern of heavy Cd pollution and light Cr and Pb pollution. In our study area, the results indicated that Cd exhibited a higher ecological risk than did the other heavy metals. Finally, the pH and nitrogen content of sediments may play a key role in controlling the amount of heavy metal bioavailability, further inducing a higher potential ecological risk.

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“…Coal gangue piled in open air is prone to spontaneous combustion, generates harmful gases and heavy metals, and results in severe geological disasters and environmental pollution [2,3]. Under the action of weathering and leaching, heavy metal elements in coal gangue enter the surrounding soil and water, degrade the ecological environment, and hinder plant growth and ecological restoration [4][5][6]. Gangue slopes are special rock slopes formed by gangue accumulation that are more complex and difficult to protect.…”

Section: Introductionmentioning

confidence: 99%

Research on the Ecological Protection of Coal Gangue Slope Based on a Polymer Curing Agent

Zhang

Yuan

et al. 2021

Advances in Materials Science and Engineering

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To improve the ecological protection of coal gangue slopes, this work developed a polymer curing agent using a pure acrylic emulsion and cement as the main raw materials. By testing the workability, waterproofing, durability, and adhesion of the curing agent with different polymer-to-cement ratios, the optimum mixing ratio of the polymer curing agent was obtained, and the protection mechanism was analysed based on the test results and by scanning electron microscopy (SEM). Then, simulated slope and practical engineering applications were carried out. The results show that pure acrylic emulsion curing agent with a polymer-to-cement ratio of 6 : 5 is most suitable for the ecological protection of coal gangue slopes. The polymer curing agent can form a network structure film layer with a good waterproofing effect on the coal gangue surface. Simultaneously, the network structure film layer can reduce the influence of weathering and leaching on the coal gangue, prevent the heavy metal elements in coal gangue from entering the surrounding soil, improve the growth environment of plants, and improve the effect of ecological restoration. This research can be applied to the ecological protection of coal gangue slopes.

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A study on soil basic characteristics, main microbial flora and typical metal fraction surrounding coal gangue dump in Xiangtan Hunan Province, south of China

Cited by 16 publications

References 34 publications

Bioleaching Coal Gangue with a Mixed Culture of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans

Bioleaching Coal Gangue with a Mixed Culture of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans

Total nitrogen and pH-controlled chemical speciation, bioavailability and ecological risk from Cd, Cr, Cu, Pb and Zn in the water level-fluctuating zone sediments of the Three Gorges Reservoir

Research on the Ecological Protection of Coal Gangue Slope Based on a Polymer Curing Agent

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