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Evaluation of Toxicity Influenced by Ion Imbalance in Wastewater

폐수에서 이온불균형문제가 생태독성에 미치는 영향 평가

  • Shin, Kisik (Water Environmental Engineering Research Division, National Institute of Environmental Research) ;
  • Kim, Jongmin (Water Environmental Engineering Research Division, National Institute of Environmental Research) ;
  • Lee, Soohyung (Water Environmental Engineering Research Division, National Institute of Environmental Research) ;
  • Lee, Jungseo (Water Environmental Engineering Research Division, National Institute of Environmental Research) ;
  • Lee, Taekjune (Water Environmental Engineering Research Division, National Institute of Environmental Research)
  • 신기식 (국립환경과학원 물환경공학연구과) ;
  • 김종민 (국립환경과학원 물환경공학연구과) ;
  • 이수형 (국립환경과학원 물환경공학연구과) ;
  • 이정서 (국립환경과학원 물환경공학연구과) ;
  • 이택준 (국립환경과학원 물환경공학연구과)
  • Received : 2017.10.18
  • Accepted : 2018.01.16
  • Published : 2018.01.30

Abstract

This paper aims to evaluate the results of toxicity testing with Daphnia magna and Vibrio fischeri on wastewater samples which might be influenced by ion imbalance. The effluents from factories were found to be more toxic with high salinity levels than those from public wastewater treatment plant (WTP) and sewage treatment plant (SWP). Clion composition was highest in the effluent, in terms of percentage, which was followed by $Na^+$, $SO_4^{2-}$ and $Ca^{2+}$. $K^+$ and $Mg^{2+}$ ion was relatively low. The sensitivity of D. magna test results was higher than V. fischeri. Among samples which were proved by V. fischeri testing to be nontoxic, the composition ratio of each ion whether toxic samples or nontoxic samples which were decided by D. magna toxicity testing, were compared. $Na^+$, $K^+$, $Ca^{2+}$, $Mg^{2+}$ ion composition ratio showed high level in nontoxic samples whereas $SO_4^{2-}$ and $Cl^-$ ion composition ratio was high in toxic samples. Accordingly, $SO_4^{2-}$ and $Cl^-$ ion seemed to be considered the ions causing toxicity in effluent. Toxicity from some categories of industries (Mining of non-metallic minerals, Manufacture of basic organic petrochemicals, Manufacture of other basic organic chemicals, Manufacture of other chemical products etc.) seemed to be influenced by salinity. The Ion concentration in influent and effluent were similar. Concentration of $Na^+$, $Cl^-$, $K^+$, $Ca^{2+}$ ions were high in influent, however $Mg^{2+}$ and $SO_4^{2-}$ ions were high in effluent.

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