Transparent exopolymer particles (TEP) removal efficiency by a combination of coagulation and ultrafiltration to minimize SWRO membrane fouling

Sheng Li; Shang Tse Lee; Shahnawaz Sinha; Tor Ove Leiknes; Gary L. Amy; Noreddine Ghaffour

doi:10.1016/j.watres.2016.06.055

Transparent exopolymer particles (TEP) removal efficiency by a combination of coagulation and ultrafiltration to minimize SWRO membrane fouling

Sheng Li, Shang Tse Lee, Shahnawaz Sinha, Tor Ove Leiknes, Gary L. Amy, Noreddine Ghaffour

Research output: Contribution to journal › Article › peer-review

41 Scopus citations

Abstract

This study investigated the impact of coagulation on the transformation between colloidal and particulate transparent exopolymer particles (TEP) in seawater; and the effectiveness of a combined pretreatment consisting of coagulation and UF on minimizing TEP fouling of seawater reverse osmosis (SWRO) membranes. Coagulation with ferric chloride at pH 5 substantially transformed colloidal TEP (0.1–0.4) into particulate TEP (>0.4) leading to a better membrane fouling control. Both 50 and 100 kDa molecular weight cut-off (MWCO) UF membranes removed most of particulate and colloidal TEP without the assistance of coagulation, but coagulation is still necessary for better UF fouling control. The improvement of combined SWRO pretreatment with coagulation and 50 kDa UF membranes was not that much significant compared to UF pretreatment with 50 KDa alone. Therefore, the minimal coagulant dosage for seawater containing TEP should be based on the UF fouling control requirements rather than removal efficiency.

Original language	English (US)
Pages (from-to)	485-493
Number of pages	9
Journal	Water Research
Volume	102
DOIs	https://doi.org/10.1016/j.watres.2016.06.055
State	Published - Oct 1 2016
Externally published	Yes

Keywords

Coagulation
Fouling
SWRO
TEP
UF pretreatment

ASJC Scopus subject areas

Water Science and Technology
Ecological Modeling
Pollution
Waste Management and Disposal
Environmental Engineering
Civil and Structural Engineering

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10.1016/j.watres.2016.06.055

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title = "Transparent exopolymer particles (TEP) removal efficiency by a combination of coagulation and ultrafiltration to minimize SWRO membrane fouling",

abstract = "This study investigated the impact of coagulation on the transformation between colloidal and particulate transparent exopolymer particles (TEP) in seawater; and the effectiveness of a combined pretreatment consisting of coagulation and UF on minimizing TEP fouling of seawater reverse osmosis (SWRO) membranes. Coagulation with ferric chloride at pH 5 substantially transformed colloidal TEP (0.1–0.4) into particulate TEP (>0.4) leading to a better membrane fouling control. Both 50 and 100 kDa molecular weight cut-off (MWCO) UF membranes removed most of particulate and colloidal TEP without the assistance of coagulation, but coagulation is still necessary for better UF fouling control. The improvement of combined SWRO pretreatment with coagulation and 50 kDa UF membranes was not that much significant compared to UF pretreatment with 50 KDa alone. Therefore, the minimal coagulant dosage for seawater containing TEP should be based on the UF fouling control requirements rather than removal efficiency.",

keywords = "Coagulation, Fouling, SWRO, TEP, UF pretreatment",

author = "Sheng Li and Lee, {Shang Tse} and Shahnawaz Sinha and Leiknes, {Tor Ove} and Amy, {Gary L.} and Noreddine Ghaffour",

note = "Funding Information: The research reported in this publication was supported by funding from Center Industry Affiliates Program (CIAP) of the Water Desalination and Reuse Center (WDRC) at King Abdullah University of Science and Technology (KAUST). Appendix A Publisher Copyright: {\textcopyright} 2016 Elsevier Ltd",

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AU - Li, Sheng

AU - Lee, Shang Tse

AU - Sinha, Shahnawaz

AU - Leiknes, Tor Ove

AU - Amy, Gary L.

AU - Ghaffour, Noreddine

N1 - Funding Information: The research reported in this publication was supported by funding from Center Industry Affiliates Program (CIAP) of the Water Desalination and Reuse Center (WDRC) at King Abdullah University of Science and Technology (KAUST). Appendix A Publisher Copyright: © 2016 Elsevier Ltd

PY - 2016/10/1

Y1 - 2016/10/1

N2 - This study investigated the impact of coagulation on the transformation between colloidal and particulate transparent exopolymer particles (TEP) in seawater; and the effectiveness of a combined pretreatment consisting of coagulation and UF on minimizing TEP fouling of seawater reverse osmosis (SWRO) membranes. Coagulation with ferric chloride at pH 5 substantially transformed colloidal TEP (0.1–0.4) into particulate TEP (>0.4) leading to a better membrane fouling control. Both 50 and 100 kDa molecular weight cut-off (MWCO) UF membranes removed most of particulate and colloidal TEP without the assistance of coagulation, but coagulation is still necessary for better UF fouling control. The improvement of combined SWRO pretreatment with coagulation and 50 kDa UF membranes was not that much significant compared to UF pretreatment with 50 KDa alone. Therefore, the minimal coagulant dosage for seawater containing TEP should be based on the UF fouling control requirements rather than removal efficiency.

AB - This study investigated the impact of coagulation on the transformation between colloidal and particulate transparent exopolymer particles (TEP) in seawater; and the effectiveness of a combined pretreatment consisting of coagulation and UF on minimizing TEP fouling of seawater reverse osmosis (SWRO) membranes. Coagulation with ferric chloride at pH 5 substantially transformed colloidal TEP (0.1–0.4) into particulate TEP (>0.4) leading to a better membrane fouling control. Both 50 and 100 kDa molecular weight cut-off (MWCO) UF membranes removed most of particulate and colloidal TEP without the assistance of coagulation, but coagulation is still necessary for better UF fouling control. The improvement of combined SWRO pretreatment with coagulation and 50 kDa UF membranes was not that much significant compared to UF pretreatment with 50 KDa alone. Therefore, the minimal coagulant dosage for seawater containing TEP should be based on the UF fouling control requirements rather than removal efficiency.

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KW - UF pretreatment

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Transparent exopolymer particles (TEP) removal efficiency by a combination of coagulation and ultrafiltration to minimize SWRO membrane fouling

Abstract

Keywords

ASJC Scopus subject areas

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