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Investigation of dynamic processing on aluminum floc aggregation: Cyclic shearing recovery and effect of sulfate ion

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Abstract

The floc formation and re-aggregation potential and the effects of sulfate on coagulation by AlCl3, polyaluminum chloride (PAC), and Al13 species using a photometric dispersion analyzer (PDA) are investigated. It is found that the recovery level from shearing is the highest for the Al13 species. This is likely a result of increased collision efficiency due to more effective charge neutralization. The experimental results show that sulfate has a significant effect on coagulation and promoting aggregation of hydrolyzed species for the Al13 species. It results in significant improvement of the coagulation efficiency through an electrostatic patch effect. The results further indicate that zeta potential of the particle suspension is not the only indicator for the coagulant efficiency when precipitate formation significantly improves coagulation.

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Authors and Affiliations

  1. School of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China

    YongBao Chu

  2. School of Environmental Science and Engineering, Shandong University, Jinan, 250100, China

    YongBao Chu, BaoYu Gao, QinYan Yue & Yan Wang

Authors
  1. YongBao Chu
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  2. BaoYu Gao
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  3. QinYan Yue
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  4. Yan Wang
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Corresponding author

Correspondence to YongBao Chu.

Additional information

Supported by the subproject of “863” Project of China (Grant No. 2002AA601290-5), the Natural Science Foundation of Shandong Province (Grant No. Y2002B03), and the National Natural Science Foundation of China (Grant No. 50678095)

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Chu, Y., Gao, B., Yue, Q. et al. Investigation of dynamic processing on aluminum floc aggregation: Cyclic shearing recovery and effect of sulfate ion. Sci. China Ser. B-Chem. 51, 386–392 (2008). https://doi.org/10.1007/s11426-007-0129-2

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  • DOI: https://doi.org/10.1007/s11426-007-0129-2

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