Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Evaluation of contamination for the Andong-dam sediment and a magnetic separation for reducing the contamination level

  • Hong, H.P. (Department of Environmental Engineering, Andong National University) ;
  • Kwon, H.W. (Department of Environmental Engineering, Andong National University) ;
  • Kim, J.J. (Department of Earth and Environmental Sciences, Andong National University) ;
  • Ha, D.W. (Korea Electrotechnology Research Institute) ;
  • Kim, Young-Hun (Department of Environmental Engineering, Andong National University)
  • Received : 2019.03.21
  • Accepted : 2019.05.10
  • Published : 2019.06.30
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Abstract

Andong-dam was built up in 1967 and it is one of the biggest dams in Korea. Previous studies showed that the sediments are highly contaminated with heavy metals such as arsenic, cadmium, and lead. Many research projects are going on to find out the source of the contamination, to evaluate the toxicities to ecosystem, to estimate the volume of sediment to be treated and to find out a good remediation method. Reports show that the sediment is highly contaminated and the main contamination source is supposed to be abandoned mines and a zinc refinery located upper stream of the river. A magnetic separation has been tested as a treatment method for the dredged sediment. Lab scale test showed that the magnetically captured portion is about 10% in weight but the contamination of heavy metal is much higher than the contamination of the passed portion. This indicates that a magnetic separation could be applied for the purpose of reduction of sediment to be treated and for increasing the volume of low toxic sediments which can be dumped as general waste. A magnetic separation using a HGMS has been tested for the sediment with variable magnetic field and the results showed the higher magnetic field increase the captured portion but the concentrating effect of heavy metal was weakened. Further study is needed to establish a useful technology and optimization between decontamination and reduction of sediment volume.

Keywords

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Fig. 1. Sampling sites in the Andong-dam area.

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Fig. 2. The ratio of captured to passed sediment tested at 1.0 T of magnetic field.

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Fig. 3. Magnetic properties of the captured and passed sediments.

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Fig. 4. Comparison of the concentration ratio between the captured and passed portion.

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Fig. 5. Correlation analysis between heavy metal concentration and the magnetic separation efficiency.

TABLE I CIRERIA FOR EVALUATION OF THE CONTAMINATION LEVEL FOR DAM SEDIMENT. (NATIONAL INSTITUTE OF ENVIRONMENTAL RESEARCH, KOREA, 2015)

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TABLE II CONCENTRATION OF HEAVY METALS BEFORE MAGNETIC SEPARATION.

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TABLE III CONCENTRATION OF HEAVY METALS AFTER MAGNETIC SEPARATION.

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