Reclaimation of heavy metal contaminated soil using synthesized zeolite (III)
Date Issued
1998-07-31
Date
1998-07-31
Author(s)
DOI
872621P002014
Abstract
This research investigated the effect of
synthesized zeolite on stabilizing Cd, Cu,
and Zn contaminated soil and also
developed model for simulating metal
transport in soil columns. The
experimental work addressed adsorption
equilibrium of metals on soils, metal
leaching from soil columns, and metal
transport model in soil environment.
Specifically, four soil samples, Pinchen,Jente, Erlin, and Chengchung, were obtained
as representatives of local soil series.
In batch adsorption experiments, metals in
solution phase will compete for the reacting
sites in soil surfaces. In system containing
all three metal ions, Cu preferentially
outcompetes Zn and Cd for sorption on soils.
Sorption of Cd exhibits the weakest affinity
for the surface reactions. Thus, in the
presence of Cu and Zn, the sorption density
of Cd is dramatically reduced by the
competition among metals.
Adding zeolite in soil mixtures will
greatly enhance the holding capability of
soils on metals, specifically Cd on Jente soil
samples. However, zeolite addition
provides less significant effect on Cu as well
as Zn sorption. The effects of zeolite
addition on metal sorption onto soils can be
modeled using Freundlich isotherm by
considering the alternation of soil cation
change capacity (CEC). The linear
relationship between Freundlich adsorption
constant K and soil CEC at various zeolite
addition was developed. This linear
equation is very useful in predicting
adsorption ability of soil with some amounts
of zeolite addition in terms of Freundlich K.
Thereafter, the parameters necessary for
pollutant advection-dispersion-adsorption
model is obtainable. The model is then
used for simulating Cd (30 mg/kg-soil) , Cd,
and Zn (300 mg/kg-soil) migration in zeolite
amended soil columns. The model outputs
provides reasonable data for understanding
the reaction as well as metal transport in soil
column, especially for metal contamination
level in the range of 30 to 300 mg/kg-soil.
Nevertheless, this model was unable to offer
acceptable results for the system with high
metal concentration such as 100 mg-Cd/kgsoil
and 1000 mg-Cu-Zn/kg-soil.
Subjects
synthesized zeolite
heavy
metal in soil
metal in soil
stabilization
linear regression
adsorption isotherm
Freundlich equation Model
SDGs
Publisher
臺北市：國立臺灣大學環境工程學研究所
Type
report
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