TY - JOUR
T1 - Nano-colloidal fouling mechanisms in seawater reverse osmosis process evaluated by cake resistance simulator-modified fouling index nanofiltration
AU - Ju, Younggil
AU - Hong, Seungkwan
N1 - Funding Information:
The authors would like to thank the Ministry of Land, Infrastructure and Transport (Code# 07seaHEROB02-01) for supporting this study through the Seawater Engineering & Architecture of High-Efficiency Reverse Osmosis (SEAHERO) program and this work is also supported by Doosan Heavy Industries and Construction for the projects, ‘Development of Fouling Index Using MMAS and Manual for Application of Pilot Plant’.
PY - 2014/6/16
Y1 - 2014/6/16
N2 - Fouling potentials caused by particulate matters are generally evaluated by fouling index, such as SDI and MFI, widely used in RO membrane practices. However, these fouling indices failed to predict the effect of nano-colloidal sizes on flux decline, implying that colloidal fouling is too complex to be analyzed by simple fouling index. Thus, in this study, nano-colloidal fouling mechanism in seawater reverse osmosis (SWRO) desalination was fundamentally investigated by employing new approach. Specifically, the specific cake resistance of colloidal foulants was first determined by a novel method, cake resistance simulator-modified fouling index nanofiltration (MFI-NFCRS), which was conducted under operating pressure and solute environment similar to those of real SWRO desalination. Then colloidal deposition and resulting cake-enhanced osmotic pressure (CEOP) were quantitatively assessed by fitting RO experimental data to the calculations from the CEOP model. The results clearly demonstrated that the flux decline caused colloidal deposition in the SWRO process depended greatly on the CEOP. The newly developed methodology including MFI-NFCRS is expected to contribute significantly to better understand nano-colloidal fouling mechanisms and to accurately predict their fouling potentials in the SWRO desalination.
AB - Fouling potentials caused by particulate matters are generally evaluated by fouling index, such as SDI and MFI, widely used in RO membrane practices. However, these fouling indices failed to predict the effect of nano-colloidal sizes on flux decline, implying that colloidal fouling is too complex to be analyzed by simple fouling index. Thus, in this study, nano-colloidal fouling mechanism in seawater reverse osmosis (SWRO) desalination was fundamentally investigated by employing new approach. Specifically, the specific cake resistance of colloidal foulants was first determined by a novel method, cake resistance simulator-modified fouling index nanofiltration (MFI-NFCRS), which was conducted under operating pressure and solute environment similar to those of real SWRO desalination. Then colloidal deposition and resulting cake-enhanced osmotic pressure (CEOP) were quantitatively assessed by fitting RO experimental data to the calculations from the CEOP model. The results clearly demonstrated that the flux decline caused colloidal deposition in the SWRO process depended greatly on the CEOP. The newly developed methodology including MFI-NFCRS is expected to contribute significantly to better understand nano-colloidal fouling mechanisms and to accurately predict their fouling potentials in the SWRO desalination.
KW - Cake resistance simulator-modified fouling index nanofiltration
KW - Cake-enhanced osmotic pressure (CEOP)
KW - Colloidal deposition
KW - Fouling index
KW - Nano-colloidal fouling mechanism
KW - Seawater reverse osmosis (SWRO) desalination
UR - http://www.scopus.com/inward/record.url?scp=84899641202&partnerID=8YFLogxK
U2 - 10.1016/j.desal.2014.03.012
DO - 10.1016/j.desal.2014.03.012
M3 - Article
AN - SCOPUS:84899641202
VL - 343
SP - 88
EP - 96
JO - Desalination
JF - Desalination
SN - 0011-9164
ER -