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Effect of Bactericides on Control of Acidification Pollution and Spontaneous Combustion of Coal Gangue Dumps in China and Its Mechanism

Author

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  • Zhenqi Hu

    (Institute of Land Reclamation and Ecological Restoration, China University of Mining and Technology (Beijing), Beijing 100083, China
    School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 211116, China)

  • Qi Zhu

    (Institute of Land Reclamation and Ecological Restoration, China University of Mining and Technology (Beijing), Beijing 100083, China)

  • Jingjing Xu

    (School of Resources and Environment, Henan University of Engineering, Zhengzhou 451191, China)

  • Xue Zhang

    (Institute of Land Reclamation and Ecological Restoration, China University of Mining and Technology (Beijing), Beijing 100083, China)

Abstract

Oxidation of pyrite in the coal gangue dumps usually results in acidification and spontaneous combustion, causing many environmental problems such as air, soil, and water pollution. The oxidizing bacteria exacerbate problems such as acidification, spontaneous combustion, and explosions. The bacterium Acidithiobacillus ferrooxidans was first separated and isolated from coal gangue samples. Bactericides such as Triclosan, Kathon (isothiazolinones), and sodium dodecyl sulfate (SDS) were selected for our study. Our findings indicated that the addition of bactericide effectively inhibited the oxidation of Fe 2+ , preventing pH decreases and oxidation-reduction potential increases. We also investigated the bactericidal mechanisms employed by the three bactericides against A. ferrooxidans by conducting a protein flocculation test, scanning electron microscopy, and time-of-flight mass spectrometry. We found that the specific inhibitory activities of the three bactericides differed. Kathon treatment caused A. ferrooxidans to release small amounts of proteins and lipids. A. ferrooxidans treated with Triclosan released small amounts of lipids and large amounts of plasmas. SDS caused the bacteria to release a large amount of proteins and lipids and degraded the surface structure of the cells, resulting in altered cell morphology.

Suggested Citation

  • Zhenqi Hu & Qi Zhu & Jingjing Xu & Xue Zhang, 2020. "Effect of Bactericides on Control of Acidification Pollution and Spontaneous Combustion of Coal Gangue Dumps in China and Its Mechanism," Sustainability, MDPI, vol. 12(17), pages 1-10, August.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:17:p:6697-:d:400759
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    Cited by:

    1. Liu, Lang & Ren, Shan & Yang, Jian & Jiang, Donghai & Guo, Junjiang & Pu, Yubao & Meng, Xianpiao, 2022. "Experimental study on K migration, ash fouling/slagging behaviors and CO2 emission during co-combustion of rice straw and coal gangue," Energy, Elsevier, vol. 251(C).
    2. Yuanyuan Li & Yingjia Cao & Mengying Ruan & Rui Li & Qi Bian & Zhenqi Hu, 2024. "Mechanism and In Situ Prevention of Oxidation in Coal Gangue Piles: A Review Aiming to Reduce Acid Pollution," Sustainability, MDPI, vol. 16(16), pages 1-21, August.
    3. Gao, Liyang & Tan, Bo & Fan, Long & Wang, Haiyan & Li, Xiaomeng & Lu, Wei & Jiang, Yuangang, 2024. "Comparison and analysis of spontaneous combustion control between coal storage silos and biomass silos," Energy, Elsevier, vol. 286(C).

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