Prevention of scale deposition on thermal desalination tubes by surface treatment

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Prevention of scale deposition on thermal desalination tubes by surface treatment

Prevention of scale deposition on thermal desalination tubes by surface treatment

Aiman Eid Al-Rawajfeh1*, Ghada A. Al Bazedi2, Ubeidulla Al-Qawabeha3, Amimul Ahsan4,5

HIGHLIGHTS

  • A correlation was developed between the roughness and scale thickness.
  • The desired roughness value was achieved by roller burnishing.
  • The accumulated scale contains mainly of calcium and magnesium.
  • Salt crystallization increases with increasing the concentration factor (CF).
  • The scale deposition increases by increasing the surface roughness and CF.

ABSTRACT

In this study, the effect of surface roughness on scale deposition on steel pipes, under identified condition in multiple-effect distillers (MED), was studied using roughness measurements of the scaled surfaces. The results showed that the desired roughness was achieved by roller burnishing (RB). A correlation was developed between the roughness value and the accumulated scale thickness on the outer surface of the tubes (scale thickness [µm] = 3.1987 Ra). The roughness of the scaled surfaces increases by increasing the amount deposited scale. The scale deposition increases by increasing the surface roughness and concentration factor (CF). An optimum value of roughness of about 0.25µm, obtained at 60-80N RB, because it was found to have the lowest amount of scale. The accumulated scale contains mainly of calcium and magnesium in addition to the sodium and potassium salts as well as iron and zinc from the metal surface, too. Salt crystallization increases with increasing the concentration factor. Water analysis was convenient with the tubes' surface analysis; the anti-scalant (Veolia Hydrex® 9209) was found to better covers the lower rouhgness pipes, and did play its role in preventing the scale through the threshold mechanism.

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To cite this article: Al-Rawajfeh AE, Al Bazedi GA, Al-Qawabeha U, Ahsan A. Prevention of scale deposition on thermal desalination tubes by surface treatment. Journal of Desalination and Water Purification 2016;5:3-9.

To link this article: http://ababilpub.com/download/jdwp5-2/