Evaluation of electrolytic reactor configuration for the regeneration of granular activated carbon saturated with methylene blue
Artículo de revista
2020-05-27
Corporación Universidad de la Costa
The performance of an electrochemical process for the regeneration of granular activated carbon (GAC) was
evaluated using boron-doped diamond (BDD) anodes. Three different configurations were tested in the reactor:
fluidized bed, packed bed with a divided cell and packed bed with an undivided cell. The GAC used was
previously saturated with a synthetic solution of methylene blue (MB). The effects of three operational
parameters were evaluated: current density, initial pH and reaction time, and NaCl as the electrolyte.
Regeneration efficiencies (REs) of up to 76% ± 2 were achieved with a current density of 6 mA·cm-2 during 24
h of reaction, and a specific electric energy consumption of 1530 kWh ton-1 of GAC was obtained. The best
results were obtained using the packed bed reactor with a divided cell and the GAC in the cathodic compartment.
The present results were attributed to an improvement in the desorption caused by the local alkaline pH in the
cathodic compartment, to the contribution of the electrochemical oxidation by the hydroxyl radical, and, in
parallel, to the chemical oxidation of the organic compounds by the oxidizing species formed from the chloride
ion. It was also found that the electrochemical regeneration process has a negative effect on the GAC integrity
after three cycles of continuous regeneration
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Evaluation of electrolytic reactor configuration for the regeneration of granular activated carbon saturated with methylene blue.pdf
Título: Evaluation of electrolytic reactor configuration for the regeneration of granular activated carbon saturated with methylene blue.pdf
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Título: Evaluation of electrolytic reactor configuration for the regeneration of granular activated carbon saturated with methylene blue.pdf
Tamaño: 3.654Mb
PDFLEER EN FLIP
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