Estudo da eficiência eletroquímica para tratamento de chorume gerado em aterro sanitário brasileiro
This work was performing effluent degradation studies by electrochemical treatment. The electrochemical oxidation (EO) hydroquinone (H2Q) was carried out in acid medium, using PbO2 electrode by galvanostatic electrolysis, applying current densities of 10 and 30 mA/cm2 . The concentration of H2Q...
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| Format: | doctoralThesis |
| Language: | por |
| Published: |
Universidade Federal do Rio Grande do Norte
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| Online Access: | https://repositorio.ufrn.br/jspui/handle/123456789/20378 |
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| Summary: | This work was performing effluent degradation studies by electrochemical treatment.
The electrochemical oxidation (EO) hydroquinone (H2Q) was carried out in acid medium,
using PbO2 electrode by galvanostatic electrolysis, applying current densities of 10 and 30
mA/cm2
. The concentration of H2Q was monitored by differential pulse voltammetry (DPV).
The experimental results showed that the galvanostatic electrolysis process performance
significantly depends on the applied current density, achieving removal efficiencies of 100%
and 80 % and 10 applying 30 mA/cm2
, respectively. Furthermore, the electroanalytical
technique was effective in H2Q be used as a detection method. In order to test the efficiency
of PbO2 electrode, the electrochemical treatment was conducted in an actual effluent, leachate
from a landfill. The liquid waste leachate (600ml effluent) was treated in a batch
electrochemical cell, with or without addition of NaCl by applying 7 mA/cm2
. The efficiency
of EO was assessed against the removal of thermo-tolerant coliforms, total organic carbon
(TOC), total phosphorus and metals (copper, cobalt, chromium, iron and nickel). These
results showed that efficient removal of coliforms was obtained (100%), and was further
decrease the concentration of heavy metals by the cathode processes. However, results were
not satisfactory TOC, achieving low total removal of dissolved organic load. Because it is
considered an effluent complex were developed other tests with this effluent to monitor a
larger number of decontamination parameters (Turbidity, Total Solids, Color, Conductivity,
Total Organic Carbon (TOC) and metals (barium, chromium, lithium, manganese and Zinc),
comparing the efficiency of this type of electrochemical treatment (EO or electrocoagulation)
using a flow cell. In this assay was compared to electro streaming. In the case of the OE,
Ti/IrO2-TaO5 was used as the anode, however, the electrocoagulation process, aluminum
electrodes were used; applying current densities of 10, 20 and 30 mA/cm2
in the presence and
absence of NaCl as an electrolyte. The results showed that EO using Ti/IrO2–TaO5 was anode
as efficient when Cl- was present in the effluent. In contrast, the electrocoagulation flow
reduces the dissolved organic matter in the effluent, under certain experimental conditions. |
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