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Scale inhibition study by turbidity measurement.

V Tantayakom1, T Sreethawong, H Scott Fogler

  • 1Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, USA.

Journal of Colloid and Interface Science
|March 9, 2005
PubMed
Summary

Scale inhibitors like ATMP, DTPMP, and PPCA prevent barium sulfate scale by increasing the critical supersaturation ratio (CSSR). Higher inhibitor concentration and pH reduce precipitate size and improve scale inhibition effectiveness.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Water Treatment

Background:

  • Barium sulfate (BaSO4) scale formation is a significant issue in industrial water systems.
  • Scale inhibitors are crucial for preventing BaSO4 precipitation and maintaining operational efficiency.
  • The critical supersaturation ratio (CSSR) is a key parameter for evaluating scale inhibitor performance.

Purpose of the Study:

  • To evaluate the effectiveness of different scale inhibitors (ATMP, DTPMP, PPCA) in preventing barium sulfate scale.
  • To investigate the influence of inhibitor concentration, solution pH, and time on BaSO4 precipitation.
  • To establish the relationship between CSSR and precipitation conditions.

Main Methods:

  • Precipitation experiments were conducted under varying conditions.
  • Critical supersaturation ratio (CSSR) was measured over time.
  • Scanning Electron Microscopy (SEM) was used to analyze precipitate morphology.
  • Particle size distribution analysis was performed.

Main Results:

  • CSSR decreased with increasing time but increased with inhibitor concentration and pH.
  • CSSR showed a linear relationship with the log of inhibitor concentration and solution pH.
  • Higher inhibitor concentration and pH resulted in smaller, more spherical BaSO4 precipitates.
  • Increased time, inhibitor concentration, and pH led to broader particle size distributions and smaller mean diameters.

Conclusions:

  • DTPMP and PPCA demonstrated superior performance as BaSO4 scale inhibitors on a per-proton and concentration basis, respectively.
  • Scale inhibitor effectiveness is strongly dependent on concentration, pH, and time.
  • CSSR is a reliable index for assessing scale inhibitor performance under various conditions.