School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China; Coal Mine Hazard Prevention and Control National Key Laboratory - Sub-laboratory for Mine Water Hazard Prevention and Control, CCTEG Xi'an Research Institute, Xi'an 710054, China; Shaanxi Engineering Research Center of Mine Ecological Environment Protection and Restoration in the Middle of Yellow River Basin, Xi'an 710054, China E-mail:
Coal Mine Hazard Prevention and Control National Key Laboratory - Sub-laboratory for Mine Water Hazard Prevention and Control, CCTEG Xi'an Research Institute, Xi'an 710054, China; Shaanxi Engineering Research Center of Mine Ecological Environment Protection and Restoration in the Middle of Yellow River Basin, Xi'an 710054, China.
Water Sci Technol. 2024 Aug;90(3):1033-1046. doi: 10.2166/wst.2024.238. Epub 2024 Jul 15.
The water-rock interactions significantly affect the dissolution and release of dissolved organic matter (DOM) during the reinjection of mine water into the underground reservoir. In this study, the surface characteristics and chemical composition of the natural medium from the open-pit coal mine were characterized. The waste consists mainly of quartz-dominated sandstone (43.64%) and mudstone dominated by sanidine (76.36%). During the 35-day experiment, two protein-like, one humus-like, and one fulvic acid-like substances were identified by PARAFAC. It was observed that the type of aqueous medium significantly affected the variational trend of DOM. Compared to the artificial medium, the fluorescence intensity of waste materials in the waste dump increased significantly during the reinjection process. Therefore, a positive correlation was observed between the fraction of mudstone in the aqueous medium and the DOM composition, mainly due to the dissolution of polycyclic aromatic hydrocarbon substances from the mudstone. The results revealed that the natural water storage medium had a certain water storage feasibility when compared with the expensive artificial medium. However, the fraction of mudstone in the water storage medium should be controlled to minimize the release of organic matter into the environment
水岩相互作用在将矿井水回灌到地下水库时，会显著影响溶解有机质（DOM）的溶解和释放。在本研究中，对露天煤矿的天然介质的表面特征和化学组成进行了表征。废物主要由石英占主导地位的砂岩（43.64%）和以正长石为主的泥岩（76.36%）组成。在 35 天的实验中，通过 PARAFAC 鉴定出两种蛋白质样物质、一种腐殖质样物质和一种富里酸样物质。结果表明，水相介质的类型显著影响 DOM 的变化趋势。与人工介质相比，在回灌过程中，废物堆中的废物材料的荧光强度显著增加。因此，在水相介质中，泥岩的分数与 DOM 组成之间存在正相关关系，这主要是由于泥岩中多环芳烃物质的溶解。结果表明，与昂贵的人工介质相比，天然储水介质具有一定的储水可行性。然而，应控制储水介质中泥岩的比例，以尽量减少有机物向环境中的释放。
