2013 Volume 7 Issue 4
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He Xuwen, Hu Jianlong, Li Jingwen, Zhang Jingjing, Wang Jianbing, Ge Peng. Treatment of wastewater containing lead by sodium sulfide precipitation[J]. Chinese Journal of Environmental Engineering, 2013, 7(4): 1394-1398.
Citation: He Xuwen, Hu Jianlong, Li Jingwen, Zhang Jingjing, Wang Jianbing, Ge Peng. Treatment of wastewater containing lead by sodium sulfide precipitation[J]. Chinese Journal of Environmental Engineering, 2013, 7(4): 1394-1398.
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Treatment of wastewater containing lead by sodium sulfide precipitation

  • 1.

    School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China

  • Received Date: 08/02/2012
    Accepted Date: 27/12/2011
    Available Online: 09/04/2013
    Fund Project:
  • The wastewater containing lead ion was treated with sodium sulfide precipitation process. Precipitation reaction kinetics of PbS and operation variables, such as Na2S dosage, initial pH of wastewater, were investigated. The particle size distribution was studied using laser particle size analyzer as well. The results showed that the precipitation reaction fitted well with first order reaction model. The optimal Na2S dosage ( molar ratio of Na2S/Pb2+) and initial pH of wastewater were 3 and 6~9, respectively. Under the optimal operation conditions, the Pb2+ removal efficiency of 99.60% was obtained, and the residual Pb2+ concentration was 0.13 mg/L after treatment, it was below the lead discharge limit of Wastewater Integrated Discharge Standard of China (GB8978-1996). The mean particle size of PbS formed in the precipitation reaction was 2.62 μm, which indicates that the PbS precipitation can be well separated from wastewater by sedimentation treatment.
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Treatment of wastewater containing lead by sodium sulfide precipitation

  • Received Date: 08/02/2012
  • Accepted Date: 27/12/2011
  • Available Online: 09/04/2013
Fund Project:

Abstract: The wastewater containing lead ion was treated with sodium sulfide precipitation process. Precipitation reaction kinetics of PbS and operation variables, such as Na2S dosage, initial pH of wastewater, were investigated. The particle size distribution was studied using laser particle size analyzer as well. The results showed that the precipitation reaction fitted well with first order reaction model. The optimal Na2S dosage ( molar ratio of Na2S/Pb2+) and initial pH of wastewater were 3 and 6~9, respectively. Under the optimal operation conditions, the Pb2+ removal efficiency of 99.60% was obtained, and the residual Pb2+ concentration was 0.13 mg/L after treatment, it was below the lead discharge limit of Wastewater Integrated Discharge Standard of China (GB8978-1996). The mean particle size of PbS formed in the precipitation reaction was 2.62 μm, which indicates that the PbS precipitation can be well separated from wastewater by sedimentation treatment.

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