| Author | Tiwaree, Ram Sharma |
| Call Number | AIT Thesis no.EV-89-26 |
| Subject(s) | Soils--Heavy metal content
|
| Note | A Thesis submitted in partial fulfillment of the requirements
for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Mechanisms involved in the transport of wastewater
containing heavy metals in soil were studied by a one dimension a l
advection limited solute transport model with t h e assumption of
saturated flow conditions. Local equilibrium was assumed for
adsorption with the introduction of Freundlich isotherm in t h e
model .
Batch and column adsorption experiments for the adsorption
of heavy metals (cadmium, zinc ) in sandy loam soil were performed
st pH 6. These experiments revealed that Freundlich isotherm gave
better correlation for t h e a d sorption of these trace metals. Th e
sandy loam soil s h owed its high affinity for the adsorption of
these metals with little preference to cadmium contaminant, and
the sorption isotherms were s lightly curvilinear. Significant
effect of influent concentrations and pore water velocities on
the adsorption of these metals were observed. Furthermore , due to
the competition for adsorption sites in the sandy loam soil ,
decrease in its adsorption capacity for these metals was found
significant.
Applicability of o n e dimensional advection limited reactive
solute transport model was investigated by using the Freundlich
isotherm parameters derived from both batch and column adsorption
experiments. The o n e dimensional solute transport model predicted
t h e observed breakthrough data satisfactorily only when the
isotherm parameters (K and n ) derived from column adsorption
experiments were used. A factor ' ¢ ' was in traduced to the
retardation factor in this model to quantify the decrease in the
adsorption of cadmium in the sandy loam soil due to the presence
of zinc in bisolute system. It was found that the presence of
zinc (2 mg/L) decreased the adsorption of cadmium (100 to 1000
µg/L) by 72 % to 65 % . Thus, the relative cadmium Darcy velocity
was higher for lower concentration of cadmium. Similarly,
decrease in the adsorption of zinc due to the competition between
cadmium and zinc for adsorption sites in the same soil was also
quantified.
Batch a nd column adsorption experiments of zinc refinery
wastewater in the sandy loam soil revealed t h at decrease in the
adsorption of both cadmium and zinc present in this wastewater is
more than in bisolute system. This wastewater contains more
metals other than cadmium and zin c. A further research to observe
the transport behavior of this wastewater is required. |
| Year | 1989 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Environmental Engineering (EV) |
| Chairperson(s) | Vigneswaran, Saravanamuthu
|
| Examination Committee(s) | Samorn Muttamara ;Tran, Francis T. ;Yamamoto, Kazuo
|
| Scholarship Donor(s) | DAAD, The Government of
Federal Re public of Germany |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1989 |