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http://dx.doi.org/10.11001/jksww.2019.33.6.413

Effect of residual metal salt on reverse osmosis membrane by coagulation-UF pretreatment process  

Go, Gilhyun (Department of Environmental Engineering, Pukyong National University)
Kim, Suhyun (Department of Environmental Engineering, Pukyong National University)
Kang, Limseok (Department of Environmental Engineering, Pukyong National University)
Publication Information
Journal of Korean Society of Water and Wastewater / v.33, no.6, 2019 , pp. 413-420 More about this Journal
Abstract
Pretreatment system of desalination process using seawater reverse osmosis(SWRO) membrane is the most critical step in order to prevent membrane fouling. One of the methods is coagulation-UF membrane process. Coagulation-UF membrane systems have been shown to be very efficient in removing turbidity and non-soluble and colloidal organics contained in the source water for SWRO pretreatment. Ferric salt coagulants are commonly applied in coagulation-UF process for pretreatment of SWRO process. But aluminum salts have not been applied in coagulation-UF pretreatment of SWRO process due to the SWRO membrane fouling by residual aluminum. This study was carried out to see the effect of residual matal salt on SWRO membrane followed by coagulation-UF pretreatment process. Experimental results showed that increased residual aluminum salts by coagulation-UF pretreatment process by using alum lead to the decreased SWRO membrane salt rejection and flux. As the salt rejection and flux of SWRO membrane decreased, the concentration of silica and residual aluminum decreased. However, when adjusting coagulation pH for coagulation-UF pretreatment process, the residual aluminum salt concentration was decreased and SWRO membrane flux was increased.
Keywords
SWRO membrane; Residual aluminum salts; Membrane fouling; Coagulation-UF pretreatment; Adjust pH;
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