File Download

There are no files associated with this item.

  • Find it @ UNIST can give you direct access to the published full text of this article. (UNISTARs only)

Views & Downloads

Detailed Information

Cited time in webofscience Cited time in scopus
Metadata Downloads

Organic fouling characterization of a CTA-based spiral-wound forward osmosis (SWFO) membrane used in wastewater reuse and seawater desalination

Author(s)
Im, Sung-JuRho, HojungJeong, SanghyunJang, Am
Issued Date
2018-03
DOI
10.1016/j.cej.2017.11.008
URI
https://scholarworks.unist.ac.kr/handle/201301/23825
Fulltext
https://www.sciencedirect.com/science/article/pii/S1385894717319289?via%3Dihub
Citation
CHEMICAL ENGINEERING JOURNAL, v.336, pp.141 - 151
Abstract
This research explores initial organic membrane fouling of element-scale spiral-wound forward osmosis (SWFO) operated at a wastewater plant using real secondary wastewater effluent (SWWE) as feed solution (FS) and synthetic seawater as draw solution (DS). The SWFO was operated long-term and the average water flux reduced from 6.0 to 3.2 L/m2·h. After the operation, membrane samples were taken from three locations in the SWFO element (i.e., inlet, middle, and outlet) to study the structural effects of organic membrane fouling. The membrane foulants were extracted in sodium hydroxide and deionized water to characterize irreversible and reversible organic foulants, respectively. Organic matter (OM) contained in the FS was dominated by hydrophilic (HPI) aromatic proteins (molecular weights (MWs) of 30,000 Da) and soluble microbial byproducts (which are associated with humic substances and have MWs of 920-2000 Da). The highest organic content (2.67 mg-C/cm2) was found in the inlet of the SWFO element and, interestingly, was mostly irreversible. In the inlet, humic- or fulvic-like organics and aromatic proteins were dominant, while higher protein-like organics were detected in the middle and the outlet of the element. The organic fouling behavior of the SWFO membrane can be explained as follows: HPI OM formed the initial, irreversible fouling on the membrane surface, after which the hydrophobic (HPO) OM, which is reversible, attached to the initially formed HPI fouling layer by electric interaction dominantly. Therefore, HPI organic foulants should be controlled to reduce irreversible fouling and subsequently guarantee the sustainable operation of SWFO in the SWWE treatment.
Publisher
ELSEVIER SCIENCE SA
ISSN
1385-8947
Keyword (Author)
Forward osmosis membraneFouling characterizationMembrane autopsyOrganic foulingSpiral-wound elementWastewater reuse and seawater desalination
Keyword
PILOT-SCALENANOFILTRATION MEMBRANESTREATMENT-PLANTHYBRID SYSTEMDRAW SOLUTIONPERFORMANCEPRETREATMENTMATTERULTRAFILTRATIONBIOREACTORS

qrcode

Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.