Rejection of micropollutants by clean and fouled forward osmosis membrane
KAUST DepartmentWater Desalination and Reuse Research Center (WDRC)
Biological and Environmental Sciences and Engineering (BESE) Division
Environmental Science and Engineering Program
Permanent link to this recordhttp://hdl.handle.net/10754/561944
MetadataShow full item record
AbstractAs forward osmosis (FO) gains attention as an efficient technology to improve wastewater reclamation processes, it is fundamental to determine the influence of fouling in the rejection of emerging contaminants (micropollutants). This study focuses on the rejection of 13 selected micropollutants, spiked in a secondary wastewater effluent, by a FO membrane, using Red Sea water as draw solution (DS), differentiating the effects on the rejection caused by a clean and fouled membrane. The resulting effluent was then desalinated at low pressure with a reverse osmosis (RO) membrane, to produce a high quality permeate and determine the rejection with a coupled forward osmosis - low pressure reverse osmosis (FO-LPRO) system. When considering only FO with a clean membrane, the rejection of the hydrophilic neutral compounds was between 48.6% and 84.7%, for the hydrophobic neutrals the rejection ranged from 40.0% to 87.5%, and for the ionic compounds the rejections were between 92.9% and 96.5%. With a fouled membrane, the rejections were between 44.6% and 95.2%, 48.7%-91.5% and 96.9%-98.6%, respectively. These results suggest that, except for the hydrophilic neutral compounds, the rejection of the micropollutants is increased by the presence of a fouling layer, possibly due to the higher hydrophilicity of the FO fouled membrane compared to the clean one, the increased adsorption capacity of hydrophilic compounds and reduced mass transport capacity, membrane swelling, and the higher negative charge of the membrane surface, related to the foulants composition, mainly NOM acids (carboxylic radicals) and polysaccharides or polysaccharide-like substances. However, when coupled with RO, the rejections in both cases increased above 96%. The coupled FO-LPRO system was an effective double barrier against the selected micropollutants. © 2011 Elsevier Ltd.
- Combined coagulation-disk filtration process as a pretreatment of ultrafiltration and reverse osmosis membrane for wastewater reclamation: an autopsy study of a pilot plant.
- Authors: Chon K, Kim SJ, Moon J, Cho J
- Issue date: 2012 Apr 15
- Trace organic solutes in closed-loop forward osmosis applications: influence of membrane fouling and modeling of solute build-up.
- Authors: D'Haese A, Le-Clech P, Van Nevel S, Verbeken K, Cornelissen ER, Khan SJ, Verliefde AR
- Issue date: 2013 Sep 15
- Comparison of the removal of hydrophobic trace organic contaminants by forward osmosis and reverse osmosis.
- Authors: Xie M, Nghiem LD, Price WE, Elimelech M
- Issue date: 2012 May 15
- Rejection of pharmaceutically active compounds and endocrine disrupting compounds by clean and fouled nanofiltration membranes.
- Authors: Yangali-Quintanilla V, Sadmani A, McConville M, Kennedy M, Amy G
- Issue date: 2009 May
- Rejection of emerging organic micropollutants in nanofiltration-reverse osmosis membrane applications.
- Authors: Xu P, Drewes JE, Bellona C, Amy G, Kim TU, Adam M, Heberer T
- Issue date: 2005 Jan-Feb