BROWSE

Related Researcher

Author's Photo

Cho, Jaeweon
OWIELAB(Organic-Water Interface Engineering Laboratory)
Research Interests
  • Convergence of Science and Arts, Feces Standard Money (FSM), Water & Energy

ITEM VIEW & DOWNLOAD

Physico-chemical pretreatment to seawater reverse osmosis (SWRO): organic characterization and membrane autopsy

Cited 14 times inthomson ciCited 15 times inthomson ci
Title
Physico-chemical pretreatment to seawater reverse osmosis (SWRO): organic characterization and membrane autopsy
Author
Shon, H. K.Vigneswaran, S.Zareie, M. H.Ben Aim, R.Lee, E.Lee, J.Cho, JaeweonKim, In S.
Keywords
Membrane autopsy; Organic matter; Pretreatment; Reverse osmosis; Seawater desalination
Issue Date
2009-01
Publisher
ELSEVIER SCIENCE BV
Citation
DESALINATION, v.236, no.1-3, pp.282 - 290
Abstract
In this study, different pretreatment methods such as microfiltration (MF), Ultrafiltration (UF), nanofiltration (NF), powdered activated carbon (PAC) adsorption and ferric chloride (FeCl(3)) flocculation were evaluated in terms of their capability in removing seawater organic matter (SWOM) and the characteristics of the foulants on the seawater reverse osmosis (SWRO) membranes. A detailed experiment with a crossflow SWRO filtration unit was conducted with SR membrane (MWCO 100 Da) at 60 bar with seawater (conductivity = 48.9 mS/cm) drawn from south-western Korea. The SWOM removal by UF, NF, PAC adsorption and FeCl(3) flocculation was 20.3, 28.9, 46 and 23.3%, respectively. SWOM used in this study predominantly consisted of small size organic matter (<1000 Da). A large amount of the hydrophobic fraction present in SWOM was removed by PAC adsorption. The SDI5(min) significantly decreased from 12.7 (without any pretreatment) to 3.2 (MF), 1.3 (UF), 1.0 (NF) and 4.4 (PAC adsorption). RO filtration of seawater with and without pretreatment showed significant flux decline (normalized flux decline (J/J(0)) = 0. 17 +/- 0.02) within 20-h operation. The elemental analyses made on the RO Surface after direct RO filtration showed that the relative fraction of the carbon decreased, while sodium (Na), magnesium (Mg), chlorine (Cl) and iron (Fe) elements were found in the foulants extracted from the fouled membrane surface. The average roughness of the clean membrane surface was 41.5 nm. After MF and UF pretreatment, the toughness slightly increased to 54.8 and 55.6 nm, respectively. On the other hand, without any pretreatment, with PAC adsorption and with FeCl(3) flocculation, the roughness increased up to 69.7, 66.4 and 110 nm, respectively. It can be concluded that the pretreatment by MF and UF could relatively preserve the RO membrane surface
URI
Go to Link
DOI
10.1016/j.desal.2007.10.078
ISSN
0011-9164
Appears in Collections:
UEE_Journal Papers
Files in This Item:
1-s2.0-S0011916408006541-main.pdf Download

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

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

MENU