Decontamination and toxicity removal of an industrial effluent containing pesticides via multistage treatment: Coagulation-flocculation-settling and photo-Fenton process

[Display omitted] •A multistage strategy for treatment of effluent from pesticides manufacturing plant.•99 % turbidity and colour removal achieved by coagulation-flocculation-settling.•Photo-Fenton improved effluent quality removing target pesticides and toxicity.•Proposed multistage treatment resul...

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Bibliographic Details
Published in:Process safety and environmental protection 2021-03, Vol.147, p.674-683
Main Authors: Gomes Júnior, Oswaldo, Santos, Maria Gabriela B., Nossol, Arlene B.S., Starling, Maria Clara V.M., Trovó, Alam G.
Format: Article
Language:English
Subjects:
Acute toxicity
Advanced oxidation process
Ametrine
Atrazine
Coagulants
Coagulation
Color removal
Decontamination
Effluent treatment
Effluents
Flocculation
Herbicides
Hydrogen peroxide
Imidacloprid
Incineration
Industrial effluents
Industrial wastewater
Insecticides
Iron
Irradiation
Manufacturing industry
Oxidation
Pesticides
Physicochemical treatment
Pollutant removal
Radiation
Settling
Solar irradiation
Tebuthiuron
Toxicity
Turbidity
Wastewater treatment
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Summary:[Display omitted] •A multistage strategy for treatment of effluent from pesticides manufacturing plant.•99 % turbidity and colour removal achieved by coagulation-flocculation-settling.•Photo-Fenton improved effluent quality removing target pesticides and toxicity.•Proposed multistage treatment resulted in highly oxidized and less toxic compounds.•Multistage treatment is less costly than conventional treatment by incineration. This paper evaluates the combination of coagulation-flocculation-settling and photo-Fenton for the decontamination of a real effluent containing ametrine ([AMT]=403mg L−1), atrazine ([ATZ]=2153mg L−1), imidacloprid ([IMD]=2936mg L−1) and tebuthiuron ([TBT]=3354mg L−1) and which is generated during the manufacturing process of pesticides. Physicochemical treatment (coagulation-flocculation-settling) was tested using different concentrations of Al(NO3)3 and Fe(NO3)3. No significant removal was achieved using Al(NO3)3 as coagulant while best results were obtained via coagulation with Fe(NO3)3 (99 % removal of color and turbidity). Pesticides remaining in the supernatant after coagulation-flocculation-settling stages were removed via photo-Fenton under black-light or solar irradiation. 82–95 % removal of target pesticides were obtained after photo-Fenton treatment (2mmol L−1 of FeOx, 5463mgL−1 of H2O2) using black-light lamps (400kJ m−2). Solar irradiation improved the degradation of target pesticides (>99 %) leading to concentrations below quantification limits (
ISSN:0957-5820
1744-3598
DOI:10.1016/j.psep.2020.12.021