Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Effects of crystallization reagent and pH on the sulfide crystallization of Cu and Ni in fluidized bed reactor

유동층 반응기를 이용한 구리와 니켈의 황화물 결정화에 결정화 시약 및 pH가 미치는 영향

  • Jeong, Eunhoo (Center for Water Resources Cycle Research, Korea Institute of Science and Technology) ;
  • Shim, Soojin (Center for Water Resources Cycle Research, Korea Institute of Science and Technology) ;
  • Yun, Seong Taek (Korea University Graduate School of Energy, Environment Policy&Technology) ;
  • Hong, Seok Won (Center for Water Resources Cycle Research, Korea Institute of Science and Technology)
  • 정은후 (한국과학기술연구원 녹색도시기술연구소 물자원순환연구단) ;
  • 심수진 (한국과학기술연구원 녹색도시기술연구소 물자원순환연구단) ;
  • 윤성택 (고려대학교 그린스쿨 대학원) ;
  • 홍석원 (한국과학기술연구원 녹색도시기술연구소 물자원순환연구단)
  • Received : 2014.03.24
  • Accepted : 2014.04.10
  • Published : 2014.04.15
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Abstract

Wastewater containing heavy metals such as copper (Cu) and nickel (Ni) is harmful to humans and the environment due to its high toxicity. Crystallization in a fluidized bed reactor (FBR) has recently received significant attention for heavy metal removal and recovery. It is necessary to find optimum reaction conditions to enhance crystallization efficacy. In this study, the effects of crystallization reagent and pH were investigated to maximize crystallization efficacy of Cu-S and Ni-S in a FBR. CaS and $Na_2S{\cdot}9H_2O$ were used as crystallization reagent, and pH were varied in the range of 1 to 7. Additionally, each optimum crystallization condition for Cu and Ni were sequentially employed in two FBRs for their selective removal from the mixture of Cu and Ni. As major results, the crystallization of Cu was most effective in the range of pH 1-2 for both CaS and $Na_2S{\cdot}9H_2O$ reagents. At pH 1, Cu was completely removed within five minutes. Ni showed a superior reactivity with S in $Na_2S{\cdot}9H_2O$ compared to that in CaS at pH 7. When applying each optimum crystallization condition sequentially, only Cu was firstly crystallized at pH 1 with CaS, and then, in the second FBR, the residual Ni was completely removed at pH 7 with $Na_2S{\cdot}9H_2O$. Each crystal recovered from two different FBRs was mainly composed of CuxSy and NiS, respectively. Our results revealed that Cu and Ni can be selectively recovered as reusable resources from the mixture by controlling pH and choosing crystallization reagent accordingly.

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References

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