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Solar Photo-Fenton optimisation in treating carbofuran-contaminated water
Optimización del proceso foto-Fenton solar para el tratamiento de agua contaminada con Carbofurano
DOI:
https://doi.org/10.15446/ing.investig.v32n1.28528Keywords:
Pesticide, carbofuran, photo-Fenton, biodegradability, Box-Benkhen design (en)pesticida, carbofurano, foto-Fenton, biodegradabilidad, diseño Box-Benkhen (es)
Box-Benkhen design response-surface methodology was developed to optimise photo-Fenton degradation of carbofuran (C12H15NO3) by using a compound parabolic collector pilot plant. The four variables considered in Box-Benkhen design model included carbofuran degradation percentage, initial carbofuran concentration, hydrogen peroxide [H2O2] concentration and iron [Fe2+] concentration. Degradation was monitored by using total organic carbon concentration and high-performance liquid chromatography. A 93.2 mg l-1 carbofuran concentration was completely degraded in t30W = 15 min with 17.1 mg l;-1 Fe2+ and 121.6 mg l-1 H2O2. Photo-Fenton degradation led to 76.7% mineralisation. Biodegradability during optimisation was evaluated by using the BOD5/COD ratio; this value increased from 0.04 at the beginning of the process to 0.52 in t30W = 20 min, thereby showing the effectiveness of using biological treatments.
Se desarrolló una metodología de superficie de respuesta, diseño Box-Benkhen, con el fin de optimizar el proceso foto-Fenton para la degradación de carbofurano (C12H15NO3) usando una planta piloto de colectores solares cilindro-parabólicos. El modelo Box-Benkhen incluyó cuatro variables: porcentaje de degradación de carbofurano, concentración inicial de carbofurano, concentración de peróxido de hidrógeno [H2O2] y concentración de hierro [Fe2+]. El proceso de degradación fue monitoreado a través de la concentración de carbono orgánico total y cromatografía líquida de alta resolución. Los resultados mostraron que una concentración de 93,2 mg l-1 de carbofurano se degradó completamente en un tiempo t30W = 15 min con 17,1 mg l-1 de Fe2+ y 121,6 mg l-1 de H2O2. El proceso foto-Fenton alcanzó 76,7% de mineralización. La biodegradabilidad fue evaluada usando la relación DBO5/DQO; este valor incrementó desde 0,04 hasta 0,52 en t30W = 20 min, mostrando la posibilidad de usar un tratamiento biológico a partir de ese momento.
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Copyright (c) 2012 Manuel Alejandro Hernández-Shek, Ana Cecilia Agudelo Henao, Claudia Mendoza Marín, Harlen Torres Castañeda
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