The Study on Land Reclamation Technology and Ecological Control for Coal Mining Subsidence Area

Land subsidence in coal mine would change the type of soil so that it influences the distribution and bioavailability of metals. The results show that the total metal concentration was in the range from 0.41 ± 0.26 mg/kg (Cd) to 94.16 ± 12.06 mg/kg (Zn) and Cd was the serious pollution metal. In spatial, the concentration of most metals (except Sb) was highest in perennial waterlogged zone while was lowest in no waterlogged zone, which implied that the perennial waterlogged zone was a sink of metals in coal mine area. However, the bio-available fraction of metals was lowest in perennial waterlogged zone.

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Distribution and Bioavailability of Metals in Subsidence Land in a Coal Mine China

Zhang

Feng

Meng

et al. 2012

Bull Environ Contam Toxicol

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Quality of water from subsidence area: a case study in the Luling coal mine, northern Anhui Province, China

Sun

Liu

Chen

2015

Water Practice and Technology

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Quality of water in the subsidence area related to coal mining is important for water usage in the coal mining areas. In this study, forty-two samples from the subsidence pools in the Luling coal mine, northern Anhui Province, China have been collected and measured for their major ion concentrations, and the data have been applied for quality evaluating of drinking and irrigation purposes. The results suggest that the water samples from different pools have different concentrations of major ions and all of them can be classified to be Na-HCO3 type. According to the results of water quality index, all of them are suitable for drinking (considering only about the major ion concentrations). However, sodium absorption ratio (SAR) and residual sodium carbonate (RSC) give different answers about irrigation purpose, the water can be used for irrigation according to SAR whereas cannot be used according to RSC, and can be attributed to the high concentrations of CO32− and HCO3−. Gibbs diagrams and relationships between Na+ normalized Ca2+, Mg2+ and HCO3− suggest that different extents of contributions from weathering of silicate, dissolution of carbonates and evaporates are the main mechanism controlling the major ion concentrations of water from the subsidence areas in this study, which is related to the natural conditions of the pools.

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Identifying the potential sources of trace metals in water from subsidence area based on positive matrix factorization

Sun¹,

Liu²,

Min³

2016

Water Practice and Technology

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Water in the subsidence area is a good choice for solving the water shortage in the coal mining area of China. In this study, positive matrix factorization model has been applied for the concentrations of seven kinds of trace metals (Pb, V, Cr, Mn, Co, Ni and Cu) in water from the subsidence area in the Luling coal mine, northern Anhui Province, China for identifying and quantifying their potential sources. Statistical analyses (including coefficients of variation and P-value of Anderson–Darling test) of metal concentrations indicate that multi factors (geological weathering/dissolution, filling of coal gauge and anthropogenic discharge) are responsible for the metal concentrations in the water. Based on the variations of Q values, three sources have been determined by US EPA (US Environmental Protection Agency) positive matrix factorization model: coal gauge filling, geological weathering or dissolution and waste discharge. The contribution degrees of these sources for all of the pools are different, and therefore, different strategies (e.g. clean the waste and the coal gauge around and in the pools) should be applied with different pools.

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The Study on Land Reclamation Technology and Ecological Control for Coal Mining Subsidence Area

Cited by 4 publications

References 4 publications

Distribution and Bioavailability of Metals in Subsidence Land in a Coal Mine China

Distribution and Bioavailability of Metals in Subsidence Land in a Coal Mine China

Quality of water from subsidence area: a case study in the Luling coal mine, northern Anhui Province, China

Identifying the potential sources of trace metals in water from subsidence area based on positive matrix factorization

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