Nanofiltration Process for Removing the Organic Precursors of Disinfection By-Products in PortableWater (2/3)
Date Issued
2005-07-31
Date
2005-07-31
Author(s)
DOI
932211E002013
Abstract
It has been demonstrated that nature organic
matter (NOM) in raw water can react with
the chlorine to form disinfection byproducts
(DBPs), which may be carcinogenic or
mutagenic. Evidence shown that resorcinol
structures in aquatic humic materials are the
major THM precursor in colored waters
(Reckhow et al., 1990). On the other hand,
several studies suggested that aliphatic
carboxylic acids, hydroxybenzoic acids,
phenols and pyrrole derivatives are reactive
substrates of organic precursors for THMs
formation (Korshin et al., 1997).
Most organic matters responsible for major
DBP precursors in source water of Taiwan
are small to medium compounds, with a
molecular weight near or less than 1 K Da
(Chang et al., 2001; Chiang et. al., 2002).
The goal of this research is to determine the
efficiency of nanofiltration in removing
model compounds of resorcinol,
phloroglucinol and m-hydroxybenzoic acid
(chosen as major small molecular DBP
precursors) and tannic acid (chosen as major
medium molecular DBP precursors). The
experiments were carried out with various
pH values, solute concentrations and the
existence of calcium to evaluate how solute
type affects the result of filtration tests, and
the retention mechanisms of these target
compounds are also studied.
Publisher
臺北市：國立臺灣大學環境工程學研究所
Type
report
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