Transparent exopolymer particles (TEP) removal efficiency by a combination of coagulation and ultrafiltration to minimize SWRO membrane fouling
Autor: | Sheng Li, Shahnawaz Sinha, TorOve Leiknes, Gary L. Amy, Noreddine Ghaffour, Shang Tse Lee |
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Rok vydání: | 2016 |
Předmět: |
Environmental Engineering
Exopolymer Ultrafiltration 02 engineering and technology 010501 environmental sciences 01 natural sciences Water Purification medicine Coagulation (water treatment) Seawater Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology Civil and Structural Engineering Membranes Chromatography Fouling Chemistry Ecological Modeling Membrane fouling Membranes Artificial 021001 nanoscience & nanotechnology Pollution Membrane Chemical engineering Ferric 0210 nano-technology Filtration medicine.drug |
Zdroj: | Water Research. 102:485-493 |
ISSN: | 0043-1354 |
Popis: | 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. |
Databáze: | OpenAIRE |
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