2007 Volume 1 Issue 10
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Liao Yuehua, Zhou Lixiang, Liu Xiuhai, Song Xingwei. Recovery of chromium from tannery sludge bioleachate[J]. Chinese Journal of Environmental Engineering, 2007, 1(10): 104-107.
Citation: Liao Yuehua, Zhou Lixiang, Liu Xiuhai, Song Xingwei. Recovery of chromium from tannery sludge bioleachate[J]. Chinese Journal of Environmental Engineering, 2007, 1(10): 104-107.
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Recovery of chromium from tannery sludge bioleachate

  • 1.

    College of Resources and Environmental Sciences, Nanjing Agriculture University,Nanjing 210095

  • 2.

    College of Resources and Environmental Sciences, Nanjing Agriculture University,Nanjing 210096

  • 3.

    College of Resources and Environmental Sciences, Nanjing Agriculture University,Nanjing 210097

  • 4.

    College of Resources and Environmental Sciences, Nanjing Agriculture University,Nanjing 210098

  • Received Date: 06/07/2007
    Accepted Date: 28/02/2007
    Fund Project:
  • Chromium(Ⅲ) in tannery sludge bioleachate can be precipitated through addition of different alkaline. The effects of addition of CaO, MgO and liquid caustic soda (NaOH) on the Cr recovery (including the dosage of added alkaline, the precipitation speed and ratio of the bioleachate after addition of different alkaline, and the content of suspended substances (SS) and Cr in the upper solution) were studied. The results indicated that the addition of CaO or MgO resulted in a higher Cr recovery than liquid caustic soda. Taking precipitation efficiency and economical cost into account, addition of CaO is more suitable than MgO in the chromium(Ⅲ) recovery process. The dosage of 10.0 g/L for CaO added in chromium(Ⅲ) containing bioleachate could adjust pH 1.6 in the initial bioleachate to pH 7 and Cr(Ⅲ) concentration of 720 mg/L in the initial bioleachate to 0 mg/L with almost 100% of Cr(Ⅲ) recovery.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Recovery of chromium from tannery sludge bioleachate

  • Received Date: 06/07/2007
  • Accepted Date: 28/02/2007
Fund Project:

Abstract: Chromium(Ⅲ) in tannery sludge bioleachate can be precipitated through addition of different alkaline. The effects of addition of CaO, MgO and liquid caustic soda (NaOH) on the Cr recovery (including the dosage of added alkaline, the precipitation speed and ratio of the bioleachate after addition of different alkaline, and the content of suspended substances (SS) and Cr in the upper solution) were studied. The results indicated that the addition of CaO or MgO resulted in a higher Cr recovery than liquid caustic soda. Taking precipitation efficiency and economical cost into account, addition of CaO is more suitable than MgO in the chromium(Ⅲ) recovery process. The dosage of 10.0 g/L for CaO added in chromium(Ⅲ) containing bioleachate could adjust pH 1.6 in the initial bioleachate to pH 7 and Cr(Ⅲ) concentration of 720 mg/L in the initial bioleachate to 0 mg/L with almost 100% of Cr(Ⅲ) recovery.

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