Pre-Treatment of Natural Organic Matters Containing Raw Water using Coagulation

Coagulation is a commonly adopted process as a pretreatment step for minimizing membrane fouling. Three coagulants, polyaluminum chloride (PACl), alum, and FeCl 3 were tested under four mixing-settling schemes for turbidity and natural organic matters (NOM) removal. The organic matters in the raw wa...

Full description

Saved in:
Bibliographic Details
Published in:Separation science and technology 2010-04, Vol.45 (7), p.911-919
Main Authors: Cheng, Ya-Ling, Wong, Ruei-Jyun, Lin, Justin Chun-Te, Huang, Chihpin, Lee, Duu-Jong, Lai, Juin-Yih
Format: Article
Language:English
Subjects:
Alum
charge neutralization
coagulant
Coagulants
Coagulation
Excitation spectra
mechanism
organic matters
Raw
Size exclusion chromatography
Spectra
Turbidity
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Coagulation is a commonly adopted process as a pretreatment step for minimizing membrane fouling. Three coagulants, polyaluminum chloride (PACl), alum, and FeCl 3 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 FeCl 3 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 FeCl 3 . Alum is a poor coagulant for NOM removal under EPC mechanism.
ISSN:0149-6395
1520-5754
DOI:10.1080/01496391003666890