Evaluation of a coupled system of electro-oxidation and ozonation to remove the pesticide Thiodan® 35 CE (endosulfan) in aqueous solution

[Display omitted] •60% less reaction time is required to remove endosulfan using a coupled process.•The process synergy enhances the rate and extent of removal of COD, TOC and toxicity.•The cyclic voltammograms indicate that an oxidation process takes place in reaction.•A major advantage is that no...

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Bibliographic Details
Published in:Fuel (Guildford) 2017-06, Vol.198, p.91-98
Main Authors: Rosales Landeros, Claudia, Barrera Díaz, Carlos E., Amaya Cháves, Araceli, Roa Morales, Gabriela
Format: Article
Language:English
Subjects:
Anodizing
Boron
Chemical oxygen demand
COD
Degradation
Diamonds
Electrodes
Electrooxidation
Endosulfan
Microtox
Oxidation
Ozonatio
Ozonation
Pesticides
Reaction time
TOC
Toxicity
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Summary:[Display omitted] •60% less reaction time is required to remove endosulfan using a coupled process.•The process synergy enhances the rate and extent of removal of COD, TOC and toxicity.•The cyclic voltammograms indicate that an oxidation process takes place in reaction.•A major advantage is that no chemicals are added in the process.•This technology is sustainable since no sludge is produced as a reaction residue. This research shows the results of the coupling of two advanced oxidation processes for the degradation of pesticide Thiodan® in water. Electrooxidation process with diamond electrodes doped with boron (BDD) alone removed 97% of COD in 100min of reaction time. Furthermore, the process of ozonation only removed 77% removal of COD, in the same reaction time. However, when the processes are coupled, the % COD removal was achieved 95% with 40min reaction time and the TOC decreased a 94%. With the coupled process practically the COD and TOC of the solution of Thiodan® was removed and MICROTOX® test showed that after 30min of reaction the sample was not exhibit toxicity. The cyclic voltammograms obtained with the coupled process, indicate the oxidation of Thiodan®.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2016.10.031