Dynamic changes of nitrogen and dissolved organic matter during the transport of mine water in a coal mine underground reservoir: Column experiments

Zhao, Li; Sun, Chao; Yan, Peixin; Zhang, Qing; Wang, Shidong; Luo, Shaohe; Mao, Yuxiang

doi:10.1016/j.jconhyd.2019.03.005

Cited by 25 publications

(12 citation statements)

References 67 publications

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“…Mine water protection and utilization has always been an important issue that needs to be solved in the process of coal mining in mining areas. In particular, in recent years, all sectors of society have paid increasingly more attention to the ecological environment, forcing enterprises to continually carry out technological innovations to fundamentally solve the problem of water resources protection and utilization, thus achieving the goal of 'zero discharge' and 'optimal utilization' of mine water (Hannan & Broz 1976;Cao et al 2019;González-Quirós & Fernández-Álvarez 2019;Li et al 2019;Zhao et al 2019;Jiao et al 2020). Underground reservoir has the characteristics of no land occupation, large storage capacity and small evaporation loss (Hannan & Broz 1976, Menéndez et al 2019Fan et al 2020;Menéndez et al 2020;Song et al 2020;Wang et al 2020a, 2020b, 2020c, Yao et al 2020Yang et al 2020).…”

Section: Resultsmentioning

confidence: 99%

Prediction of water source and water volume of underground reservoir in coal mine under multiple aquifers

Chi

Cao

et al. 2022

Water Supply

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The role of coal mine underground reservoir(CMUR) in ‘guide storage and use’ greatly solves the problem of mine water waste. Replenishment and prediction of reservoir water sources provides an important support for the successful development of key technologies concerning CMUR. To study water replenishment for CMUR, the hydrogeological conditions of the Shendong mining area are investigated as an example. Based on the relationship between the development height of the ‘two belts’ of shallow coal seams and the relative occurrence location of aquifers, the aquifers are generalized and classified according to occurrence location. Taking Bulianta Coal Mine as the research background, a discrete element fluid-solid coupling numerical simulation model is constructed to analyze the development characteristics of mining-induced fractures after coal seam mining, and the water replenishment channel of the CMUR is determined. On this basis, analysis is made on the change law of water pressure in the aquifer, aquifuge and coal seam roof under mining action. Taking hydraulic head pressure and water velocity as the judgment basis, prediction and evaluation are made on the water replenishment capacity of CMUR. The research results can provide references for coal mine safety production and mine water protection and utilization.

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Section: Resultsmentioning

confidence: 99%

Prediction of water source and water volume of underground reservoir in coal mine under multiple aquifers

Chi

Cao

et al. 2022

Water Supply

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“…According to statistics, China's annual output of mine water is about 8 billion tons, of which 6 billion tons are wasted, which accounts for about 60% of the industrial and civilian water. If the mine water can be fully utilized, there will be abundant water for downstream coal processing [1,[5][6][7]. Therefore, "protection and utilization of mine water" has become a strategic requirement for sustainable development as well as an important prerequisite for the green development of coal resources.…”

Section: Introductionmentioning

confidence: 99%

Water Supply and Regulation of Underground Reservoir in Coal Mine considering Coal-Water Occurrence Relationship

Chi

Cao

Li³

et al. 2022

Geofluids

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Water supply prediction and control is one of the key issues in exploitation of coal mine underground reservoirs (CMUR). In order to investigate the water supply for underground reservoirs in coal mines, the aquifers were classified into three types (types I, II, and III) according to the relative location of aquifers. The discrete element fluid structure coupling numerical simulation model is constructed according to the classification results. The numerical simulation parameters are inversed based on the surface subsidence data and the advance support pressure, and then, the disturbed characteristics and water pressure variation law of different types of aquifers are studied. The research results show that the maximum water inflow of type III, type II, and type I aquifers is 739 m3/h, 377 m3/h, and 279 m3/h, respectively. The dynamic calculation process of underground reservoir capacity under mining disturbance is refined, and the regulation and storage methods of underground reservoir are preliminarily put forward.

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“…It is reported that mine water is mildly acidic to alkaline due to the existence of different minerals [16][17][18][19]. The major positive ions (Ca 2+ , Na + , Mg 2+ , K + ) and the major negative ions (F − , Cl − , NO 3 − , HCO 3 − , SO 4 2− ) are detected in the coal mine water [20,21]. Water hardness is an index to evaluate the alkaline elements in the water solutions [13,19,22].…”

Section: Introductionmentioning

confidence: 99%

Combined Treatments of Underground Coal Slurry: Laboratory Testing and Field Application

Zhang

Dong

Zhao

et al. 2021

Water

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During the coal mining process, underground water is generated from the longwall face. In the meantime, the coal cutting process would produce coal particles. Coal slurry is generated in the underground working site, especially for water abundant coal mines. The generated coal slurry is treated to prevent water pollution. Due to the extensively existing of the suspended solid, the traditional process method would often introduce new problems. In this study, laboratory testing was conducted to investigate the characteristics, including the particle size distribution of the coal sludge, coal slurry compositions, slurry viscosity and coal mine water quality. In order to improve the coal slurry treatment efficiency, based on the laboratory results, a novel combined treatment of underground coal slurry is proposed. First, the coarse grained coal slurry is process by a vibrating screening machine. Then, the coal slurry containing fine coal powders is processed through a settling pond. The sedimentation results of the coal solid materials are analyzed. The polymer flocculant is also added into the coal slurry to improve the sedimentation. These combined treats of the coal slurry significantly remove the suspended solid and improve the quality of the coal mine water. Based on the laboratory testing, the specific details of the field applications are designed. The key novelty of this paper is the underground background. All of these treatments are based on the underground environment and are capable of being applied in underground workings. From field applications and observations, these novel combined treatments of coal slurry in the underground site are effective. This study provides a novel method to treat the coal slurry, which has innovations from engineering aspect. These procedures are useful for the underground coal slurry treatment, especially for water-abundant coal mines. The normal coal production is guaranteed and less affected by the coal slurry discharge process. Meanwhile, the water pollution problem is much addressed and the damage of coal slurry to the environment is reduced.

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Dynamic changes of nitrogen and dissolved organic matter during the transport of mine water in a coal mine underground reservoir: Column experiments

Cited by 25 publications

References 67 publications

Prediction of water source and water volume of underground reservoir in coal mine under multiple aquifers

Prediction of water source and water volume of underground reservoir in coal mine under multiple aquifers

Water Supply and Regulation of Underground Reservoir in Coal Mine considering Coal-Water Occurrence Relationship

Combined Treatments of Underground Coal Slurry: Laboratory Testing and Field Application

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