Removal Mechanism of Humic Acid and As Using UF-Chitosan
Date Issued
2001-07-31
Date
2001-07-31
Author(s)
DOI
892211E002078
Abstract
Along the southern-west coast of
Taiwan, residents of some endemic areas
suffered not only black-foot disease but also
higher mortality rate of cancer.
The scope of this project is to
investigate the removal abilities of humic
acid and arsenic by UF-chitosan process.
Water quality parameters after the
UF-chitosan process, such as fluorescence
intensity, total organic carbon, concentration
and membrane fouling are to be evaluated.
In addition, gel filtration chromatography
(GFC) will be used for mocular size
fractionation of humic substances. The
fractions will be subjected to the UF process,
and the mechanism of the chelating reation
in humic acid arsenic is to be investigated.
After the pretreatment of adsorbent #6 ,adsorbent #5, adsorbent CB and adsorbent
CP, the fact indicated that the preadsorption
caused severe permeate flux decline and
membrane fouling was not improved
significantly with the chitosan in
chitosan-UF operation. But the removal
ability of TOC and arsenic is effective.
By employing GFC method, humic
acid was fractionated into five groups
corresponding to the molecular weight
ranges: >35000 Da, 20000-35000 Da, 6000-
20000 Da, 1500-6000 Da and <1500 Da.
The results showed that adding arsenic into
the humic acid solution would quench the
relative fluorescence intensity by
accelerating both the rate of intersystem
crossing and nonradiative process. The
relative fluorescence intensity was strongly
quenched by arsenic in the molecular weight
range of >35000 Da.
Subjects
humic acid
arsenic
ultrafiltration (UF)
gel filtration chromatography
(GFC)
(GFC)
fluorescence intensity
SDGs
Publisher
臺北市：國立臺灣大學環境工程學研究所
Type
report
File(s)![Thumbnail Image]()
Loading...
Name
892211E002078.pdf
Size
192.96 KB
Format
Adobe PDF
Checksum
(MD5):48f335d25be6c74aae65db7cb10a2e52