The Release of Dissolved Organic Matter and Inorganic Nitrogen from Coal Gangue of Different Geologic Ages in North China

  • Li Zhao
  • Lei Zhang
  • Yanfang Sun
  • Mingshi WangEmail author
  • Qing Zhang
  • Shaohe Luo
  • Jianlin Li
Technical Article


Static leaching experiments lasting 480 h were performed to investigate the release of dissolved organic matter (DOM) and inorganic nitrogen from coal gangues collected from the Jurassic Middle-Lower Yan′an formation in the Bulianta coal mine (CG1) and the Permian Shanxi formation in the Baode coal mine (CG2) in North China. The amounts of dissolved organic carbon (DOC), NH4+–N, NO3–N, and NO2–N released from CG1 were all much higher than those from CG2, as was the electrical conductivity. These were highly correlated with the mineral and chemical composition and lithology. The fluorescence, biological, and humification indices for the leachates were indicative of autochthonous microbial processes that occurred during DOM formation. In addition, the specific ultraviolet absorbance at 254 nm (SUVA254) and fluorescence intensities (divided by DOC) of peaks B1, B2, T2, and A indicated that more microbial and less plant precursors in the DOM were released from CG2 than from CG1. Adsorption and denitrification of NH4+–N and NO3–N released from CG1 and CG2 were observed. These results should be useful in assessing the environmental impacts caused by the DOM and nitrogen released from coal gangue.


Coal-forming age Fluorescence Autochthonous microbial process 


Statische Laugungsexperimente wurden über 480 Stunden durchgeführt, um die Freisetzung von gelösten organischen Stoffen (DOM) und anorganischem Stickstoff aus Kohleflözen zu untersuchen, die aus der Mittleren und Unteren Yan’an Jura-Formation in der Bulianta-Kohlemine (CG1) und der Shanxi-Formation des Perm in der Kohlemine Baode (CG2) in Nordchina gewonnen wurden. Die Mengen an gelöstem organischem Kohlenstoff (DOC), NH4+-N, NO3-N und NO2-N, die von CG1 freigesetzt wurden, waren alle viel höher als die von CG2, ebenso wie die elektrische Leitfähigkeit. Diese Freisetzung korrelierte stark mit der mineralischen und chemischen Zusammensetzung und der Lithologie. Die Fluoreszenz, biologischen Indices und Humifizierungsindizes für die Auslaugungsprodukte zeigten autochthone mikrobielle Prozesse an, die während der DOM-Bildung auftraten. Zusätzlich zeigten die spezifische Ultraviolettabsorption bei 254 nm (SUVA254) und die Fluoreszenzintensitäten (dividiert durch DOC) der Peaks B1, B2, T2 und A, dass im DOM mehr mikrobielle und weniger Pflanzenvorläufer aus CG2 freigesetzt wurden als aus CG1. Zudem wurden Adsorption und Denitrifikation von NH4+-N und NO3-N beobachtet, die aus CG1 und CG2 freigesetzt wurden. Diese Ergebnisse sollten nützlich sein, um die Umweltauswirkungen des DOM und des Stickstoffs zu bewerten, die von Kohleflözen freigesetzt werden.


Se realizaron experimentos de lixiviación estática durante 480 h para investigar la liberación de materia orgánica disuelta (DOM) y de nitrógeno inorgánico de gangas de carbón recolectadas de la formación jurásica de Yan’an del Medio-Bajo en la mina de carbón Bulianta (CG1) y de la formación Pérmica Shanxi en la mina de carbón Baode (CG2) en el norte de China. Las cantidades de carbono orgánico disuelto (DOC), NH4+-N, NO3−-N y NO2−-N liberados de CG1 fueron mucho más altas que las de CG2, al igual que la conductividad eléctrica. Hubo una fuerte correlación con la composición mineralógica y química y la litología. Los índices de fluorescencia, biológico y de humificación para los lixiviados fueron indicativos de procesos microbianos autóctonos que ocurrieron durante la formación de DOM. Además, la absorbancia ultravioleta específica a 254 nm (SUVA254) y las intensidades de fluorescencia (divididas por DOC) de los picos B1, B2, T2 y A indicaron que se liberaron más precursores de plantas microbianas y menos en el DOM del CG2 que del CG1. Se observó adsorción y desnitrificación de NH4+-N y NO3--N liberado de CG1 y CG2. Estos resultados deberían ser útiles para evaluar los impactos ambientales causados por el DOM y el nitrógeno liberado de la ganga del carbón.


利用480h静态浸溶试验 , 研究了华北地区补连塔煤矿侏罗系中下统延安组矸石(CG1)和保德煤矿二叠系山西组煤矸石(CG2)的水溶性有机物(DOM)和无机氮的释放规律。研究结果表明 , CG1释放的溶解性有机碳(DOC)、NH4+-N、NO3--N和NO2--N明显高于CG2 , 其电导率值也显著高于CG2 , 这与它们的矿物组分、化学成分和岩性密切相关。渗出液的荧光、生物和腐殖质指数表明矸石中DOM的形成具有显著的“自生源”微生物过程特征。此外 , 水样波长254nm特定紫外吸收(SUVA254)和B1、B2、T2和A峰的单位有机碳的荧光强度表明 , 与CG1相比 , CG2溶出的DOM中具有更多的微生物前驱体但是植物前驱体较少的。实验过程中矸石释放出的氨氮和硝态氮还分别出现了吸附和反硝化作用。研究结果有益于评价煤矸石DOM和氮释放对环境的影响。



This work was financially supported by the: National Natural Science Foundation of China (Grant 41402216), Foundation of Key Scientific Research Projects of Henan Colleges and Universities in 2019 (19A170008), Key Laboratory of Mine Geological Hazards Mechanism and Control and Department of Land and Resources of Shaanxi Province Foundation (KF2018-06), the China Postdoctoral Science Foundation (Grant No. 2016M602239) and the Henan Provincial Natural Science Foundation Project (182300410155).


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institute of Resources and EnvironmentHenan Polytechnic UniversityJiaozuoChina
  2. 2.Key Laboratory of Mine Geological Hazards Mechanism and ControlXi’anChina
  3. 3.Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic RegionJiaozuoChina

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