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[Dynamic properties of Al-humic flocs].

Xiaochang Wang1, Pengkang Jin

  • 1School of Environmental and Municipal Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China.

Huan Jing Ke Xue= Huanjing Kexue
|October 10, 2002
PubMed
Summary

Al-humic floc structure loosens as they grow, decreasing fractal dimension. This occurs due to particle collision and agglomeration during coagulation, influenced by alum dosage.

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Area of Science:

  • Environmental Science
  • Colloid and Surface Chemistry

Context:

  • Understanding the dynamic properties and structural evolution of aluminum-humic (Al-humic) flocs is crucial for water treatment processes.
  • Microscopic techniques allow for detailed observation of floc formation and changes in their structural characteristics.

Purpose:

  • To investigate the dynamic properties of Al-humic flocs using microscopy.
  • To analyze the variation in floc structure, specifically fractal dimension, during coagulation.
  • To establish the relationship between floc size, fractal dimension, and the underlying mechanisms of particle aggregation.

Summary:

  • Floc size increases with agitation time, reaching an equilibrium. As flocs grow, their structure becomes looser, indicated by an increased void ratio, leading to a decrease in fractal dimension (Df) from 1.8 to approximately 1.4.
  • An exponential relationship (Df = Adf-n) was observed between fractal dimension and floc size.
  • Theoretical analysis suggests that random collision and agglomeration of primary particles cause the decrease in fractal dimension with increasing floc size.

Impact:

  • Alum dosage significantly influences floc growth rate and equilibrium size.
  • Overdosing alum can lead to an apparent reduction in the fractal dimension of Al-humic flocs, impacting flocculation efficiency.
  • These findings provide insights into the structural dynamics of flocs, aiding in optimizing water purification strategies.

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