Application of electrokinetic remediation on contaminated alluvial soils in Sri Gading, Batu Pahat,
The research described in this thesis is a comprehensive account to remove excessive heavy metals and radionuclides contained in the most radiation-contaminated soil by using the most optimised electrokinetic remediation technique. This novel study that saved time and costs based on electrokin...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2020
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/1152/1/24p%20SAFFUWAN%20MOHAMED%20JOHAR.pdf http://eprints.uthm.edu.my/1152/2/SAFFUWAN%20MOHAMED%20JOHAR%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/1152/3/SAFFUWAN%20MOHAMED%20JOHAR%20WATERMARK.pdf |
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| Summary: | The research described in this thesis is a comprehensive account to remove excessive
heavy metals and radionuclides contained in the most radiation-contaminated soil by
using the most optimised electrokinetic remediation technique. This novel study that
saved time and costs based on electrokinetic optimisation was the ultimate vision to
be discovered on this thesis. In addition, reduction in terrestrial gamma radiation
doserate (TGRD) by reducing soil pH level during electrokinetic processes was
somewhat new and exciting in this study. The TGRD and soil pH of various soil type
within Batu Pahat and Kluang districts were measured. Soil with the highest TGRD
was selected to be remediated by various types of electrokinetics setup, to list out the
best electrokinetic parameters. Results obtained from these setup led to the
development of the most optimised electrokinetic setup, especially in remediating
radionuclides. Data analysis showed that Holyrood-Lunas soil species taken from Sri
Gading recorded the highest TGRD of 476.841.9 nGy h-1
. The pre-electrokinetic
examination by X-ray fluorescence (XRF) indicated that 10 heavy metals contained in
the sample were significantly higher than the Environmental Protection Agency (EPA)
contamination indices limit, in decreasing order, were Th>As>Sb>Sn>U>Cr>Pb>Ni>
V>Zr. The post-electrokinetic analysis suggested the most optimised parameters for
Th and U removals were 3.0 hours remediation time, 30 volts electrode voltage, 22 cm
electrode spacing, plate-shaped electrodes by 88 cm and in 1-D electrodes
configuration. Applications of these optimised parameters by high-pure germanium
(HPGe) analysis gave a very low 232Th and 238U removals at 2.7423.78 and 0.232.64
ppms, respectively, while for the pilot scale electrokinetic setup shows average
removals at 1.4793.09 and 0.214.11 ppms, respectively. The relationships between
232Th and 238U concentrations with soil pH changes supported the initial hypotheses
that reducing TGRD can be obtained by reducing soil pH level during the
electrokinetic remediation process. Thus it can be concluded that the findings of this
research can contribute towards the best soil decontamination. |
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