Open AccessBioremediation of heavy metals pollution from acidic coal gangue with sulfate-reducing bacteria
Author(s) -
Ding Ma,
Xinyu Liu,
Mingjiang Zhang,
Jianlei Wang,
Xiao-Min Hu,
Yan Xiao,
Chuiyun Tang,
Juan Zhong
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/634/1/012024
Subject(s) - acid mine drainage , sulfate , sulfate reducing bacteria , gangue , environmental chemistry , bioremediation , biostimulation , sulfide , leachate , chemistry , pollution , leaching (pedology) , contamination , bacteria , environmental science , mining engineering , geology , biology , ecology , soil water , organic chemistry , soil science , paleontology
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.