USE OF ULTRAFILTRATION FOR REMOVAL OF DISSOLVED ORGANIC MATTER (II)
Date Issued
1998-07-31
Date
1998-07-31
Author(s)
DOI
872211E002007
Abstract
The effect of molecular weight of
humic acid on ultrafiltration was
examined by feeding solution containing
humic acid fractionated from gel
filtration chromatography (GFC) and
pretreated with powdered activated
carbon (PAC) pretreatment. The benchscale
UF system was operated in
constant humic acid concentration,
recirculation, and UF-PAC hybrid
modes.
By employing GFC method,
samples were fractionated into four
groups corresponding to the molecular
weight ranges: G-1 (6,500~22,600 Da),
G-2 (2,200~6,500 Da), G-3 (650~2,200
Da), and G-4 (180~650 Da). The results
indicated that the degree of permeate
flux decline almost increased with
molecular weight under constant
concentration and recirculation
operation modes.
The composition of humic acid
changed after PAC pretreatment and
caused severe permeates flux decline.
GFC examination showed that as PAC
dosage increased, the percentage of
humic acid in 6,500~22,600 Da fraction
increased. The highst molecular weight
fration was responsible for the increase
in flux decline.
Combination of UF and PACadsorption process significantly
improved removal efficiency in TOC
and THMFP, but impaired the permeate
flux. The organic matter remained after
PAC adsorption had wide molecular
weight range and easy to fouling the
membrane.
Subjects
ultrafiltration
gel filtration
chromatography
chromatography
PAC pretreatment
humic acid
and fractionation
Publisher
臺北市：國立臺灣大學環境工程學研究所
Type
report
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