Performance evaluation of carbon nanotube enhanced membranes for SWRO pretreatment application
J. Lee, S. Jeong, G. Naidu, Y. Ye, V. Chen, Z. Liu, S. Vigneswaran
Journal of Industrial and Engineering Chemistry, Volume 38, pp. 123-131, (2016)
Adsorption, Carbon nanotube membrane, Seawater organic matter, Seawater pretreatment, Ultrafiltration
Multi-wall carbon nanotube (MWCNT) membrane was tested for SWRO pretreatment. The MWCNT membrane itself showed a superior permeate flux (321.3 LMH/bar), which was 4-times as polyethersulfone ultrafiltration (PES-UF) membrane. Reduction of dissolved organic matter improved to 66% with fewer amounts of powder activated carbon (PAC) (0.5 g/L) in MWCNT membrane filtration maintaining a high permeate flux of 600 LMH/bar. It was due to the increased porosity (84.5%) and hydrophilicity (52.9°) by incorporating MWCNT/polyaniline into PES membrane. Ionic strength affected organic removal in seawater filtration by altering electrostatic interaction between organic matter and surface charge of the positively charged MWCNT membrane.