Título: | SIMULATION OF ATRAZINE DEGRADATION BY IN SITU ELECTROCHEMICALLY GENERATED OZONE FOR GROUNDWATER REMEDIATION | ||||||||||||||||||||||||||||||||||||||||
Autor: |
YSRAEL MARRERO VERA |
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Colaborador(es): |
ROBERTO JOSE DE CARVALHO - Orientador MAURICIO LEONARDO TOREM - Coorientador |
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Catalogação: | 31/MAR/2009 | Língua(s): | PORTUGUESE - BRAZIL |
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Tipo: | TEXT | Subtipo: | THESIS | ||||||||||||||||||||||||||||||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=13216&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=13216&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.13216 | ||||||||||||||||||||||||||||||||||||||||
Resumo: | |||||||||||||||||||||||||||||||||||||||||
The impact of pesticides on the quality of groundwater has
been the
subject of scientific and public health concerns in the
entire planet, especially in
areas where groundwater is mainly used for human
consumption. The intensive
use of pesticides in agriculture and the high persistence
of several of these
chemicals have required a rigorous control of possible
environmental
contaminations, especially of drinking water sources. The
herbicide atrazine is
frequently detected in natural waters of many countries and
was selected for
investigation. A laboratory scale study on the evaluation
of the effectiveness of
remediation of atrazine in groundwater utilizing in situ
electrochemical
generated ozone was conducted. β-PbO2 was used as anode for
ozone
generation. β-PbO2 electrodes were prepared by
electrodeposition on Ti plates.
X-ray diffraction analysis confirmed that the deposit
contained only the α and β
PbO2 with the β phase prevailing. The electrochemical ozone
production
increases with incrementing the current density. The rate
of ozone production
during the electrolysis was 4.4, 19.5 and 39.1 mg h-1 for
current densities of 0.5,
1.0 and 1.50 kAm(-2), respectively. In the experiments of
atrazine degradation by
electrochemically generated ozone a difference in atrazine
degradation was
found when the applied current density was varied. The
results evidenced that
the atrazine degradation rates increased with augmenting
the current density.
This is indicative of a greater oxidation ability of the
anode with increasing the
current applied due to the production of more
electrogenerated active oxidant
(O3/.OH). The kinetic analysis of the above results related
to different reaction
orders gave good linear correlations when the data was
fitted with a pseudo
first-order reaction rate equation. The pseudo first-order
rate constants obtained
were 6.2×10(−3), 8.8×10(−3), and 1.21×10(−2) min(−1) for
0.5, 0.1, and 1.5 kA m(−2),
respectively. The acrylic column (26 cm x 4 cm ID) used in
flow degradation
experiments was packed with clean sand and contained a
single set of electrodes.
Two expanded titanium mesh coated with β-PbO2 and RuO2
served as anode and
cathode, respectively. During the experiments the atrazine
effluent concentration
progressively diminished. After 8 hours of electrolysis the
effluent atrazine
concentration was reduced by 75% and 80% applying current
densities of 0.4
and 0.6, respectively. These results confirm the potential
applicability of this
type of groundwater plume control strategy. The study
constitutes a foundation
to the future developing of this aquifer remediation
technique.
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