Study on the evolution of dissolved organic matter in the underground storage of mine water

Abstract

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. HIGHLIGHTS The evolution law of DOM in the underground storage of mine water has been elucidated first.; The water storage medium in sandstone and mudstone was divided, and the influence of mineral composition on the evolution of water quality separately was studied.; The variation patterns of different components of DOM in mine water were scientifically analyzed using three-dimensional fluorescence spectroscopy combined with the parallel factor method.;

Keywords

• artificial reinjection
• dom
• mine water
• parallel factor
• water–rock interaction