Chia Nan University of Pharmacy & Science Institutional Repository:Item 310902800/27701
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    Title: Effect of coagulation mechanisms on the fouling and ultrasonic cleaning of PTFE membrane
    Authors: Wan, Meng-Wei
    Morales Futalan, Cybelle
    Chang, Cheng-Hung
    Kan, Chi-Chuah
    Contributors: 環境工程與科學系
    Keywords: Charge Neutralization
    Fractal Dimension
    Sweep Flocculation
    Ultrasonic Cleaning
    Date: 2012
    Issue Date: 2014-03-21 16:18:07 (UTC+8)
    Publisher: Iwa Publishing
    Abstract: In this study, the effect of coagulation pretreatment on membrane fouling and ultrasonic cleaning efficiency was investigated using a dead-end polytetrafluoroethylene (PTFE) microfiltration system. The extent of membrane fouling was examined under different coagulation mechanisms such as charge neutralization (CN), electrostatic patch effect (EPE) and sweep flocculation (SW). Fouling through EPE mechanism provided the greatest flux decline and least permeate flux recovery over CN and SW. EPE produces more stable, smaller and more compact flocs while CN and SW have large, easily degraded and highly-branched structured flocs. The predominant fouling mechanism of EPE, CN and SW is pore blocking, a combination of pore blocking and cake formation, and cake formation, respectively. Better permeate flux recovery is observed with SW over CN and EPE, which implies formation of less dense and more porous cake deposits. The morphology of fouled membranes was examined using scanning electron microscopy (SEM).
    Relation: Water Science And Technology, 66(11), 2291-2298
    Appears in Collections:[Dept. of Environmental Engineering and Science (including master's program)] Periodical Articles
    [Dept. of Sports Management] Periodical Articles

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