Aplicação de tratamentos eletroquímicos integrados para remediação de solos e águas contaminadas com petróleo e pesticidas
Electrochemical technologies have been proposed as a promising alternative for the treatment of effluents and contaminated soils. Therefore, the objective of this work was to study the treatment of contaminated soils and wastewaters using electrochemical technologies. Thus, the study regarding th...
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| Formato: | doctoralThesis |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/20379 |
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| Resumo: | Electrochemical technologies have been proposed as a promising alternative for
the treatment of effluents and contaminated soils. Therefore, the objective of this work
was to study the treatment of contaminated soils and wastewaters using electrochemical
technologies. Thus, the study regarding the scale-up of the electrochemical system with
continuous flow treatment of wastewater of the petrochemical industry was investigated
using platinum electrodes supported on titanium (Ti / Pt), and boron-doped diamond
(BDD). The results clearly showed that under the operating conditions studied and
electrocatalytic materials employed, the better removal efficiency was achieved with
BDD electrode reducing the chemical oxygen demand (COD) from 2746 mg L-1
to 200
mg L-1
in 5 h consuming 56.2 kWh m-3
. The decontamination of soils and effluents by
petrochemical products was evaluated by studying the effects of electrokinetic
remediation for removal of total petroleum hydrocarbons (HTP) from contaminated soil
with diesel. The efficiency of this process was dependent on the electrolyte used
Na2SO4 (96.46%), citric acid (81.36%) and NaOH (68.03%) for 15 days. Furthermore,
the effluent after treatment of the soil was treated by electrochemical oxidation,
achieving a good elimination of the organic polluting load dissolved. Depending on the
physical behavior of wastewater contaminated with oil (emulsified state); atrazine
emulsified effluents were investigated. The main characteristics of the effluent produced
during the washing of contaminated soil were studied, being dependent on the surfactant
dosage used; which determined its electrolytic treatment with BDD. The
electrochemical oxidation of emulsified effluent of atrazine was efficient, but the key to
the treatment is reducing the size of micelles. |
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