Colloidal characteristics of aluminum hyd roxide dispersions depending on coagulant composition and pH regulator dosing method

Authors

  • Ruslan A. Anushko Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus
  • Alesia V. Zyhmant Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieninhradskaja Street, Minsk 220006, Belarus
  • Tatsiana A. Savitskaya Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus; Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieninhradskaja Street, Minsk 220006, Belarus
  • Nadzeia G. Tsyhankova Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieninhradskaja Street, Minsk 220006, Belarus
  • Dzmitry D. Hrynshpan Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieninhradskaja Street, Minsk 220006, Belarus

Keywords:

dispersions, coagulants, aluminum sulfate, polyaluminum chloride, sedimentation rate, pH regulator, aluminum hydroxide

Abstract

The effect of aluminum coagulants composition and pH regulator dosing method on colloidal characteristics of aluminum hydroxide dispersions (diameter, particle size distribution, density and sedimentation rate of aggregates) was investigated by using of laser diffraction method. Highly basic polyaluminum chloride «Brilliant-50» was established to form aggregates of larger size and lower density than aluminum sulfate. Size and density of the aluminum sulfate aggregates were found to be a function of the pH dosing method (multi- or single-stage dosing). This effect became more evident when powdered coagulant was used as compared to its solution. According to computational study results hydration of aluminum polynuclear hydroxocomplexes increased with their molecular mass increasing, and consequently density of coagulation aggregates formed by them was suggested to decrease.

Author Biographies

  • Ruslan A. Anushko, Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus

    student at the faculty of chemistry

  • Alesia V. Zyhmant, Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieninhradskaja Street, Minsk 220006, Belarus

    researcher at the laboratory for cellulose so lu tions and products of their treatment

  • Tatsiana A. Savitskaya, Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus; Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieninhradskaja Street, Minsk 220006, Belarus

    PhD (chemistry), docent; professor at the department of physical chemistry, Belarusian State University, and leading researcher at the laboratory of cellulose solutions and products of their treatment, Research Institute for Physical Chemical Problems, Belarusian State University

  • Nadzeia G. Tsyhankova, Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieninhradskaja Street, Minsk 220006, Belarus

    PhD (chemistry); leading researcher at the laboratory of cellulose solutions and products of their treatment

  • Dzmitry D. Hrynshpan, Research Institute for Physical Chemical Problems, Belarusian State University, 14 Lieninhradskaja Street, Minsk 220006, Belarus

    doctor of science (chemistry), full professor; head of the laboratory of cellulose solutions and products of their treatment

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Published

2019-02-15

Issue

No. 1 (2019): Journal of the Belarusian State University. Chemistry

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Original Articles

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How to Cite

[1]
Anushko, R.A. et al. 2019. Colloidal characteristics of aluminum hyd roxide dispersions depending on coagulant composition and pH regulator dosing method. Journal of the Belarusian State University. Chemistry. 1 (Feb. 2019), 22–31. DOI:https://doi.org/10.33581/2520-257X-2019-1-22-31.