Bioremediation of heavy metals pollution from acidic coal gangue with sulfate-reducing bacteria. Issue 1 (February 2021)

• Record Type: Journal Article
• Authors: Ma, Daozhi; Liu, Xinyu; Zhang, Mingjiang; Wang, Jianlei; Hu, Xuewu; Yan, Xiao; Tang, Chuiyun; Zhong, Juan
• Is Part Of: IOP conference series. Volume 634:Issue 1(2021)
• Publication Date: 2021-02
• Subjects: Earth sciences -- Periodicals; Environmental sciences -- Congresses; Environmental sciences -- Periodicals; 550.5
• DOI: 10.1088/1755-1315/634/1/012024
• Languages: English
• ISSNs: 1755-1307

Abstract

Abstract: Acid mine drainage (AMD) generated by acidic coal gangue has caused coal mine area environmental degradation. Sulfate-reducing bacteria (SRB) was used to inhibit the oxidation of metal sulfide minerals from acidic coal gangue in Kaili city, Guizhou province. Four experimental groups (named as CK, R-M, R-S, R-SCa) were carried out, the results showed that SRB can effectively raise the pH (2.3 in CK, 7.8 in R-SCa) and inhibit heavy metals leachability. The low initial pH of the system can retard the start-up of sulfate reduction process. The leaching toxicity test indicated that the leachate of heavy metals in coal gangue after bioremediation was significantly reduced. High-throughput sequencing analysis showed the diversity of SRB genera in R-SCa (e.g., Desulfotomaculum and Desulfobulbus was detected) was enhanced in comparation to R-M and R-S. The results demonstrated that SRB significantly inhibit acidic coal gangue contamination and the biostimulation is also a potential solution due to indigenous SRB existence.