鋁系淨水污泥燒結資源化為氧化鋁吸附劑研究
Date Issued
2002-07-31
Date
2002-07-31
Author(s)
DOI
902211E002038
Abstract
Daily generation of water industry
sludge account is increasing yearly. The
final disposal of the waste water sludge
becomes a severe burden for both the
administration and the environment.
Therefore, the study applies sintering
technology to convert water sludge to a
useful and stable adsorption material. The
properties of the sintered materials were
characterized using SEM, XRD, BET and
acid –base titration. In addition, adsorption
experiments in conjunction with TLM
simulation were employed for SO4
2-, MoO4
2-,
SeO4
2-, Cr(Ⅲ) and Hg(Ⅱ) interactions at thewater/sintered materials interface.
The elemental analysis of original
water sludge shows the major constituents as
SiO2 (54%), Al2O3 (21%) and Fe2O3 (6.6%).
The SEM and XRD analyses on sintered
materials also reveal that SiO2 is the
principle compound of the matrix. The
crystallized SiO2 decreases as sintering
temperature increases. BET measurements
gave the specific surface of 2 ~ 5 m2 per
gram sintered materials. As composition of
SiO2 is more than 50%, surface of the
sintered materials become negatively
charged.
The adsorption effect of SO4
2- 、
MoO4
2- 、SeO4
2- is not significant.
Adsorption of Cr(Ⅲ) and Hg(Ⅱ) on the
sintered materials show that sorption is
dependent on system’s pH. The sorption
densities are 1.40 mg Cr/g at pH 4.8 and
0.43 mg Hg/g at pH 6.0. Sorption of Cr(Ⅲ)
is unaffected by solution electrolyte.
However, sorption of Hg(Ⅱ) is significantly
affected by solution electrolyte. Affinity of
Cr(Ⅲ) for the surface reacting sites seem to
out-compete Hg( Ⅱ ). Simulation of the
experimental results by TLM has revealed
that Cr3+ forms inner-sphere bidentate
complexes and CrOH2+ forms monodentate
complexes. The intrinsic adsorption
constants (pKint) for Cr3+ and CrOH2+ are
3.5 and 7.7, respectively; and for Hg(Ⅱ) as
out-sphere complex is -3.75.
Subjects
water sludge
sinter
adsorption
TLM
Publisher
臺北市：國立臺灣大學環境工程學研究所
Type
report
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