Remediation of Acid Mine Drainage in the Haizhou Open-Pit Mine through Coal-Gangue-Loaded SRB Experiments

Yanrong Dong (), Ziqing Gao, Junzhen Di, Dong Wang, Zhenhua Yang, Xuying Guo, Ying Li, Xiaotong Zhu and Guixian Wang
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Yanrong Dong: College of Civil Engineering, Liaoning Technical University, Fuxin 123000, China
Ziqing Gao: College of Civil Engineering, Liaoning Technical University, Fuxin 123000, China
Junzhen Di: College of Civil Engineering, Liaoning Technical University, Fuxin 123000, China
Dong Wang: College of Mining, Liaoning Technical University, Fuxin 123000, China
Zhenhua Yang: College of Mining, Liaoning Technical University, Fuxin 123000, China
Xuying Guo: College of Science, Liaoning Technical University, Fuxin 123000, China
Ying Li: Liaoning Institute of Geology and Mineral Resources Co., Ltd., Shenyang 110032, China
Xiaotong Zhu: College of Civil Engineering, Liaoning Technical University, Fuxin 123000, China
Guixian Wang: College of Civil Engineering, Liaoning Technical University, Fuxin 123000, China

Sustainability, 2023, vol. 15, issue 12, 1-19

Abstract: To address the pollution problem of acid mine drainage (AMD) characterized by high concentrations of Fe 2+ , Mn 2+ , and SO 4 2− , a combination of coal gangue (CG) and sulfate-reducing bacteria (SRB) was employed. The effects of coal-gangue dosage, SRB inoculation concentration, and temperature on AMD treatment with coal-gangue-loaded SRB were determined through single-factor experiments and response surface methodology (RSM) experiments. By considering the principles of adsorption isotherms, adsorption kinetics, and reduction kinetics, the removal mechanisms of SO 4 2− , Fe 2+ , and Mn 2+ in AMD using coal gangue-loaded SRB in the the Haizhou open-pit mine was revealed. The results showed that the overall effectiveness of the four types of coal-gangue-loaded SRB in repairing AMD was as follows: 3# CG-loaded SRB > 2# CG-loaded SRB > 1# CG-loaded SRB > 4# CG-loaded SRB, with coal-gangue-loaded SRB in the the Haizhou open-pit mine showing the best performance. According to the RSM test, the optimum conditions for repairing AMD with coal-gangue-loaded SRB in the open-pit mine were a coal-gangue dosage of 52 g, SRB inoculation concentration of 11.7%, and temperature of 33.4 °C. The order of factors affecting the removal of SO 4 2− and Fe 2+ from AMD by SRB loaded on coal gangue was SRB inoculation concentration > temperature > coal-gangue dosage. For Mn 2+ , the order of influence was temperature > SRB inoculation concentration > coal-gangue dosage. In the process of repairing Fe 2+ with coal-gangue-loaded SRB in the the Haizhou open-pit mine, the biological activity metabolism of SRB played a leading role, while the adsorption isotherm of Mn 2+ followed the Freundlich model. The adsorption kinetics of coal-gangue-loaded SRB in the the Haizhou open-pit mine for Fe 2+ and Mn 2+ in AMD conformed to Lagergren’s second-order kinetic model, while the reduction kinetics of SO 4 2− conformed to a first-order reaction model.

Keywords: sulfate-reducing bacteria (SRB); the Haizhou open-pit mine; coal gangue; acid mine drainage (AMD); load (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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