Ecology and Resilient Infrastructure

Korean Society of Ecology and Infrastructure Engineering (응용생태공학회)
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Evaluation of Toxicity for Commercial Red Mud Pellets Using Pseudokirchneriella subcapitata and Daphnia magna

  • Lee, Saeromi (Environmental and Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Ahn, Chang Hyuk (Environmental and Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Park, Jae Roh (Environmental and Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Lee, Sooji (Department of Civil and Environmental Engineering, Hanbat National University) ;
  • Lee, Inju (Department of Civil and Environmental Engineering, Hanbat National University) ;
  • Joo, Jin Chul (Department of Civil and Environmental Engineering, Hanbat National University)
  • Received : 2015.11.28
  • Accepted : 2015.12.20
  • Published : 2015.12.30
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Abstract

The toxicity of red mud (RM) pellets for water purification was evaluated using Pseudokirchneriella subcapitata and Daphnia magna in a lab-scale experiment. According to the algal growth inhibition test, both specific growth rates and relative growth rates of P. subcapitata decreased, and the growth inhibition rates increased ($R^2=0.97$, p<0.001) as the concentration of RM pellets in the aqueous solution increased (>1.6 g/L). Also, based on the acute toxicity evaluation test on D. magna, toxic unit (TU) values ranged between 0.00 and 2.83, and increased with an increase in the concentration of RM pellets in the aqueous solution. A correlation analysis indicated that the pH of RM pellets was statistically correlated with TU values ($R^2=0.77$, p=0.02). The environmental implication from this study is that the concentration of RM pellets in an aqueous solution needs to be lower than 4.4 g/L to keep the maximum permissible TU value less than 1.0.

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References

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