Degradation of a four-pesticide mixture by combined photo-Fenton and biological oxidation

Complete degradation of a pesticide mixture by a combination of a photo-Fenton pretreatment and an activated-sludge batch reactor is demonstrated. Four commercial pesticides, Laition, Metasystox, Sevnol and Ultracid were chosen for this experiment. The active ingredients are, respectively, dimethoat...

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Bibliographic Details
Published in:Water research (Oxford) 2009-02, Vol.43 (3), p.653-660
Main Authors: Ballesteros Martín, M.M., Sánchez Pérez, J.A., Casas López, J.L., Oller, I., Malato Rodríguez, S.
Format: Article
Language:English
Subjects:
Activated sludge
Advanced Oxidation Processes
Applied sciences
Biodegradation, Environmental
Biological treatment
bioreactors
carbaryl
Carbon
degradation
dimethoate
Exact sciences and technology
greenhouses
Hydrogen Peroxide - chemistry
Iron - chemistry
Light
methidathion
mineralization
Minerals
Other industrial wastes. Sewage sludge
oxidation
Oxidation-Reduction - radiation effects
oxydemeton-methyl
pesticide mixtures
Pesticides
Pesticides - chemistry
Pesticides - metabolism
Photo-Fenton
Pollution
pretreatment
Solar photocatalysis
Wastes
wastewater treatment
Water treatment and pollution
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Summary:Complete degradation of a pesticide mixture by a combination of a photo-Fenton pretreatment and an activated-sludge batch reactor is demonstrated. Four commercial pesticides, Laition, Metasystox, Sevnol and Ultracid were chosen for this experiment. The active ingredients are, respectively, dimethoate, oxydemeton-methyl, carbaryl and methidathion. The original pesticide concentration was 200 mg L −1. Biotreatment began after 31% photocatalytic mineralization, which after 5 h in a 6-L stirred batch-mode tank reactor with non-acclimated activated sludge, leaves the photo-Fenton effluent completely degraded. This biotreatment time is shorter than commonly found in municipal wastewater treatment plants (∼8–10 h). Therefore, the combined process is effective for rapid pesticide degradation in wastewater with complete removal of parent compounds and the associated DOC concentration. Nonetheless, assessment of this technology should take into account higher pesticide concentrations and how this factor affects both the photocatalytic and the biological oxidation.
ISSN:0043-1354
1879-2448
DOI:10.1016/j.watres.2008.11.020