|Title:||Pre-Treatment of natural organic matters containing raw water using coagulation||Authors:||Cheng Y.-L.
|Keywords:||Charge neutralization;Coagulant;Mechanism;Organic matters||Issue Date:||2010||Journal Volume:||45||Journal Issue:||7||Start page/Pages:||911-919||Source:||Separation Science and Technology||Abstract:||
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 "electrostatic patch coagulation" (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. ? Taylor & Francis Group, LLC.
|Appears in Collections:||化學工程學系|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.