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    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/27674


    標題: Fouling Elimination of PTFE Membrane under Precoagulation Process Combined with Ultrasound Irradiation
    作者: Wan, Meng-Wei
    Yang, Hui-Ling
    Chang, Cheng-Hung
    Reguyal, Febelyn
    Kan, Chi-Chuan
    貢獻者: 環境工程與科學系
    關鍵字: Coagulation
    Microfiltration
    Ultrasonic Cleaning
    Floc Characteristic
    日期: 2012-03
    上傳時間: 2014-03-21 16:17:15 (UTC+8)
    出版者: Asce-Amer Soc Civil Engineers
    摘要: Precoagulation is one of the effective pretreatments in membrane filtration. This process mitigates membrane fouling, which is the major drawback of membrane technology in drinking water and wastewater treatment. This study investigated the effects of precoagulation under different coagulation mechanisms on membrane fouling. Use of ultrasound in polytetrafluoroethylene (PTFE) membrane cleaning was also evaluated. In precoagulation, synthetic raw water was precoagulated using aluminum sulfate at different coagulation mechanisms, named electrostatic patch effect (EPE), charge neutralization (CN), and sweep flocculation (SW). Flocs produced from different coagulation mechanisms exhibited different sizes, structures, and strengths. Likewise, the fouling type generated from each mechanism was demonstrated as pore blocking for EPE, cake formation for SW, and combination phenomenon for CN. Moreover, this study indicated that the membrane flux was enhanced in the sequence of EPE > CN > SW. The flux recovery rate after ultrasonic cleaning was in the sequence of SW > CN > EPE. Finally, this study evidenced that the floc characteristics from various coagulation mechanisms affected membrane performance, fouling types, and ultrasonic cleaning efficiency. DOI: 10.1061/(ASCE)EE.1943-7870.0000406. (C) 2012 American Society of Civil Engineers.
    關聯: Journal of Environmental Engineering-Asce, 138(3,SI), 337-343
    Appears in Collections:[環境工程與科學系(所)] 期刊論文

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