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Evaluation of Mn Removal Efficiency from the Mine Drainage in the Presence of Fe Using Slag Complex Reactors
제강슬래그 복합매질체를 이용한 철 유입에 따른 광산배수내 망간 제거효율 평가
Econ. Environ. Geol. 2018 Oct;51(5):401-7
Published online October 31, 2018;  https://doi.org/10.9719/EEG.2018.51.5.401
Copyright © 2018 the Korean society of economic and environmental gelology.

Dong-Kwan Kim, Won Hyun Ji, Duk-Min Kim, Hyun-Sung Park and Youn Soo Oh*
김동관 ·지원현 ·김덕민 ·박현성 ·오연수*

Mine Reclamation Corporation
한국광해관리공단 기술연구센터
Received September 21, 2018; Revised October 17, 2018; Accepted October 27, 2018.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 Abstract
For the treatment of heavy metals in the mine drainage from the closed mine area, various methods such as passive, active and semi-active treatments are considered. Among contaminated elements in the mine drainage, Mn is one of the difficult elements for the treatment because it needs high pH over 9.0 for its concentration to be reduced. In this study, the efficiency of various slag complex reactors (slag (S), slag+limestone (SL) and slag+Mn coated gravel (SG)) on Mn removal in the presence of Fe, which is a competitive element with Mn, was evaluated to investigate effective methods for the treatment of Mn in mine drainage. As a result of experiments on Mn removal without Fe during 358 days, using influent with 30~50 Mn·mg/L and pH 6.7 on the average, S reactor showed continuously high Mn removal efficiency with the average of 99.9% with pH 8.9~11.4. Using the same reactors, Mn removal experiments with Fe during 237 days were conducted with the influent with 40~60 Mn·mg/L. The pH range of effluent reached to 6.1~10.0, which is slightly lower than that of effluent without Fe. S reactor showed the highest range of pH with 7.1~9.9, followed by S+L and S+G reactor. However, the efficiency of Mn removal showed S+L>S>S+G with the range of 94~100%, 68~100% and 68~100%, respectively in spite of relatively low pH range. S+L reactor showed the most resistance on Fe input, which means other mechanisms such as MnCO3 formation by the carbonate prouced from the limestone or autocatalysis reaction of Mn contributed to Mn removal rather than pH related mechanisms. The evidence of reactions between carbonates and Mn, rhodochrosite (MnCO3), was found from the X-ray diffraction analysis of precipitates sample from S+L reactor. From this study, the most effective reactors on Mn removal in the presence of Fe was S+L reactor. The results are expected to be applied for the Mn containing mine water treatment in the presence of Fe within the relatively low range of pH.
Keywords : Mine drainage, Mn treatment, slag complex reactors, Mn removal efficiency, autocatalysis reactions

 

October 2018, 51 (5)