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Browsing by Author "Wong, Ruei-Jyun"

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    Pre-Treatment of Natural Organic Matters Containing Raw Water using Coagulation
    (2010)
    Cheng, Ya-Ling
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    Wong, Ruei-Jyun
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    Lin, Justin Chun-Te
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    Huang, Chihpin
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    Lee, Duu-Jong
    Coagulation is a commonly adopted process as a pretreatment step for minimizing membrane fouling. Three coagulants, polyaluminum chloride (PACl), alum, and FeCl3 were tested under four mixing-settling schemes for turbidity and natural organic matters (NOM) removal. The organic matters in the raw waters were fractionated by high performance size exclusion chromatography (HP-SEC) system and were characterized using the excitation-emission matrix (EEM) fluorescence spectra. Sufficient rapid mixing and slow mixing or applying two-stage coagulation benefit turbidity removal using PACl or FeCl3 under oelectrostatic patch coagulationo (EPC) mechanism. The EPC mechanism is not efficient for alum coagulation. At higher coagulant doses, the NOM removal is not affected by mixing condition. Intensive rapid mixing alone benefits NOM removal using PACl or FeCl3. Alum is a poor coagulant for NOM removal under EPC mechanism.
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    Water Coagulation Using Electrostatic Patch Coagulation (EPC) Mechanism
    (2010)
    Cheng, Ya-Ling
    ;
    Wong, Ruei-Jyun
    ;
    Lin, Justin Chun-Te
    ;
    Huang, Chihpin
    ;
    Lee, Duu-Jong
    Coagulation of fine particles to form large flocs is an essential step to reach efficient dewatering of wet materials. The electrostatic patch coagulation (EPC) mechanism was applied in this study to remove turbidity and natural organic matters in water using four different dosing-mixing schemes. Sufficient rapid mixing and slow mixing or applying two-stage coagulation benefit removal of turbidity. The EPC mechanism could only efficiently remove organic matters of molecular weight of 7500-10,000Da. Only sufficient rapid mixing is relevant to organic matter removal. The mechanisms for natural organic matters (NOM) removal are proposed to be complexation of ions and NOM to form insoluble aggregates to be separated by membrane filtration.