Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
권호 표지
DOI QR코드

DOI QR Code

The Study on the Removal Process of Heavy Metals from Mine Drainage Using Coal Bottom Ash

석탄 바닥회를 이용한 광산배수의 중금속 제거 공정 연구

  • Kim, Hye Rim (Technology planning team, Korea Resources Corporation) ;
  • Lee, Jung Mi (Technology planning team, Korea Resources Corporation) ;
  • Han, In Kyu (Technology planning team, Korea Resources Corporation)
  • 김혜림 (한국광물자원공사 기술기획팀) ;
  • 이정미 (한국광물자원공사 기술기획팀) ;
  • 한인규 (한국광물자원공사 기술기획팀)
  • Received : 2020.10.23
  • Accepted : 2020.12.11
  • Published : 2020.12.30
Download PDF
⟨ Previous Next ⟩

Abstract

This study was carried out to utilize the coal bottom ash generated in a circulating fluidized bed combustion boiler as a treatment agent for heavy metal ions, and experiments were conducted to remove heavy metal ions from the acid mine drainage. The batch experiments were conducted to investigate the influence of dosage of ash, initial concentration of solution on the removal capacity of heavy metal ions (Cu, Cd, Cr, Pb). The results of the experiment showed that the total removal capacity of heavy metals was 30.8 mg/L and 46.4 mg/g, respectively, under the condition that the concentration of coal ash was added as 15 g/L of heavy materials and 10 g/L of light materials. After that, a long-term column experiment was performed to determine the maximum removal capacity of heavy metal ions (Cu, Cd, Cr, Pb, As), and the removal capacity for each metal component was investigated. After approximately 60 days of operation, the maximum removal capacity of heavy metals was 23.6 mg/g at pH 9.25.

본 연구는 유동층 석탄보일러에서 발생하는 석탄 바닥회를 중금속 처리제로 활용하기 위하여 수행하였으며, 산성광산배수 중의 중금속 성분을 제거하기 위한 실험을 실시하였다. 대상 중금속은 구리, 카드뮴, 크롬, 납으로 선정하여 산성광산배수 모사액을 제조하였고, 석탄회 첨가량, 시험용액의 초기 중금속 농도에 대한 제거실험을 실시하였다. 실험결과, 석탄회 농도가 중량물 시료 15 g/L, 경량물 시료 10 g/L로 첨가된 조건에서 총 중금속의 제거능은 각각 30.8 mg/L, 46.4 mg/g로 나타났다. 이후 비소를 추가하여 5종 중금속에 대한 최대 제거능을 파악하기 위하여 장기 컬럼실험을 실시하였으며, 각각의 중금속 성분에 대한 제거능을 조사하였고, 약 60일간 가동 후 pH 9.25에서 최대 중금속 제거능은 23.6 mg/g이었다.

Keywords

References

  1. Suh, D. H., Maeng, J. H., 2015 : A Study on expanding the recycling of coal ash for minimizing environmental impact imposed by the establishment of thermal power plant ash ponds, J. Environmental Impact Assessment, 24(5), pp. 472-486. https://doi.org/10.14249/eia.2015.24.5.472
  2. Jang, J. G., Ji, S. W., Ahn, J. W., 2017 : Utilization of circulating fluidized bed combustion ash ans related specifications for mine backfills, J. Korean Institute of Resources Recycling, 26(2), pp.71-79. https://doi.org/10.7844/kirr.2017.26.2.71
  3. Chae, D. H., Kim, K. O., Shin, H. Y., et al., 2014 : Dynamic characteristics of liquidity filling materials mixed with reclaimed ash, J. Korean Geo-Environmental Society, 15(4), pp.5-11. https://doi.org/10.14481/jkges.2014.15.4.5
  4. Yoo, J. C., Ji, S. W., Ahn, J. W., et al., 2017 : A case study of mine environment restoration using coal ash, J. Korean Institute of Resources Recycling, 26(2), pp.80-88. https://doi.org/10.7844/kirr.2017.26.2.80
  5. Basu, P., 1999 : Combustion of coal in circulating fluidizedbed boilers: a review, Chemical Engineering Science, 54(22), pp.5547-5557. https://doi.org/10.1016/S0009-2509(99)00285-7
  6. Manz, O. E., 1997 : Worldwide production of coal ash and utilization in concrete and other products, Fuel, 76(80), pp. 691-696. https://doi.org/10.1016/S0016-2361(96)00215-3
  7. Oh, S. J., Kim, S. C., Ko, J. I., et al., 2011 : Evaluating stabilization efficiency of coal combustion ash (CCA) for coal mine wastes: column experiment, Korean J. Soil Science and Fertilizer, 44(6), pp.1071-1079. https://doi.org/10.7745/KJSSF.2011.44.6.1071
  8. Kwon, S. D., Kim, S. J., 1999 : A Study on the treatment of the acid mine drainage using the steel mill slag, J. Soil and Groundwater Environment, 6(4), pp.206-212.
  9. Hwang, J. H., Chon, H. T., Jung, M. C., 1999 : A study on the treatment of the acid mine drainage in the vicinty of the dogye coal mine, Korea, J. Korean Society of Mineral and Energy Resources Engineers, 36(4), pp.260-268.
  10. Song, Y. J., Lee, G. S., Shin, K. H., et al., 2012 : Adsorption of heavy metals on sludge from the treatment process of acid mine drainage, J. Korean Institute of Resources Recycling, 21(4), pp.35-43. https://doi.org/10.7844/kirr.2012.21.4.035
  11. Yoo, J. K., Hong, S. C., Kim, I. K., et al., 1997 : The adsorption characterization of coal fly ash for removal of heavy metals from waste water, J. Korean Society of Environmental Engineers, 19(5), pp.651-660.