Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Treatment Characteristics of Plating Wastewater Containing Freecyanide, Cyanide Complexes and Heavy Metals (I)

도금폐수내 유리시안과 착염시안 및 중금속의 처리특성 (I)

  • Jung, Yeon-Hoon (Department of Energy and Environmental Engineering, The Graduate School of Energy and Environment Seoul National University of Technology) ;
  • Lee, Soo-Koo (Department of Environmental Engineering, Seoul National University of Technology)
  • 정연훈 (서울산업대학교 에너지환경대학원 에너지환경공학과) ;
  • 이수구 (서울산업대학교 환경공학과)
  • Received : 2009.10.15
  • Accepted : 2009.11.23
  • Published : 2009.11.30
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Abstract

The mean pH of wastewater discharged from the plating process is 2, so a less amount of alkali is required to raise pH 2 to 5. In addition, if sodium sulfite is used to raise pH 5 to 9 in the secondary treatment, caustic soda or slaked lime is not necessary or only a small amount is necessary because sodium sulfite is alkali. Thus, it is considered desirable to use only $FeSO_4{\cdot}7H_2O$ in the primary treatment. At that time, the free cyanide removal rate was highest as around 99.3%, and among heavy metals, Ni showed the highest removal rate as around 92%, but zinc and chrome showed a low removal rate. In addition, the optimal amount of $FeSO_4{\cdot}7H_2O$ was 0.3g/L, at which the cyanide removal rate was highest. Besides, the free cyanide removal rate was highest when pH value was 5. Of cyanide removed in the primary treatment, the largest part was removed through the precipitation of ferric ferrocyanide: $[Fe_4(Fe(CN)_6]_3$, and the rest was precipitated and removed through the production of $Cu_2[Fe(CN)_6]$, $Ni_2[Fe(CN)_6]$, CuCN, etc. Furthermore, it appeared more effective in removing residual cyanide in wastewater to mix $Na_2SO_3$ and $Na_2S_2O_5$ at an optimal ratio and put the mixture than to put them separately, and the optimal weight ratio of $Na_2SO_3$ to $Na_2S_2O_5$ was 1:2, at which the oxidative decomposition of residual cyanide was the most active. However, further research is required on the simultaneous removal of heavy metals such as chrome and zinc.

Keywords

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