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Membrane Water Treatment
  Volume 5, Number 3, July 2014, pages 221-233
DOI: http://dx.doi.org/10.12989/mwt.2014.5.3.221
 


Scaling predictions in seawater reverse osmosis desalination
Houda Hchaichi, Saanoun Siwar, Hamza Elfil and Ahmed Hannachi

 
Abstract
    Simulations were conducted to predict supersaturation along Reverse Osmosis (RO) modules for seawater desalination. The modeling approach is based on the use of conservation principles and chemical equilibria equations along RO modules. Full Pitzer ion interactive forces model for concentrated solutions was implement to calculate activity coefficients. An average rejection rate for all ionic species was considered. Supersaturation has been used to assess scaling. Supersaturations with respect to all calcium carbonate forms and calcium sulfate were calculated up to 50% recovery rate in seawater RO desalination. The results for four different seawater qualities are shown. The predictions were in a good agreement with the experimental results.
 
Key Words
    seawater; desalination; reverse osmosis modules; supersaturation; scaling assessment
 
Address
(1) Houda Hchaichi, Saanoun Siwar, Ahmed Hannachi:
Laboratory of Process Engineering and Industrial Systems, National Engineering School of Gabes, University of Gabes, Ibnel khattab Street, 6029, Zrig Gabès, Tunisia;
(2) Hamza Elfil:
LabTEN-Water Research and Technologies Center, Soliman, Tunisia.
 

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