Pre-Treatment of natural organic matters containing raw water using coagulation

Ya Ling Cheng, Ruei Jyun Wong, Justin Chun Te Lin, Ch-Hpin Huang, Duu Jong Lee*, Juin Yih Lai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

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.

Original languageEnglish
Pages (from-to)911-919
Number of pages9
JournalSeparation Science and Technology
Volume45
Issue number7
DOIs
StatePublished - 1 Apr 2010

Keywords

  • Charge neutralization
  • Coagulant
  • Mechanism
  • Organic matters

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