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Total organic carbon removal from a chemical lab's wastewater using Fenton's reagent
Remoción de Carbono Orgánico Total en aguas residuales provenientes de laboratorio químico, empleando reactivo Fenton
DOI:
https://doi.org/10.15446/ing.investig.v33n2.39507Keywords:
Fenton’s reagent, advanced oxidation, laboratory wastewater, TOC removal (en)reactivo Fenton, procesos avanzados de oxidación, agua residual laboratorio, remoción de COT (es)
Treating industrial wastewater represents a serious problem nowadays; it requires a strong understanding of the particular systems and (in most of cases) ad hoc solutions. This work describes the use of Fenton's reagent (reaction between H2O2 and Fe(II)) for removing total organic carbon (TOC) from a particular chemical laboratory's lab-scale batch reactor wastewater. Some operating variables (hydrogen peroxide and ferrous ion concentration, temperature and pH) were evaluated regarding final TOC removal. An economic optimisation was made by means of a second order polynomial model representing these variables' behaviour regarding TOC removal (0.94 R2). The highest experimentally reached TOC removal was 88.8% at 50 mg/L [Fe(II)]0, 50 mM [H2O2]0, pH=2.8 at 80ºC, while 53.9% was obtained in optimised conditions, i.e. 36 mg/L [Fe(II)] 0,45.5 mM [H2O2]0, pH=2.6 at 20oC. It was found that the Fenton process could achieve 41% removal, even in adverse conditions (pH close to 6). It was noted from the analysis that both H2O2 concentration and temperature had a powerful effect on organic matter degradation efficiency, as well as on total treatment cost.
El tratamiento de efluentes residuales industriales representa un serio problema en la actualidad, ya que, por lo general, requiere de soluciones particulares (ad hoc). Este trabajo describe el uso del reactivo Fenton [reacción entre H2O2 y Fe(II)] en la remoción de materia orgánica medida como carbono orgánico total (COT), sobre un efluente proveniente de un laboratorio de análisis químico. Para dicho fin se evaluó el papel que desempeñan algunas de las condiciones de operación del proceso [concentraciones de H2O2 y Fe(II], temperatura y pH] sobre la remoción final de COT del efluente. Al mismo tiempo se desarrolló la optimización económica del tratamiento, ajustando los datos experimentales a un modelo multivariable polinomial de segundo orden que representa el comportamiento del sistema con un R2 de 0.94. Experimentalmente, la mejor remoción encontrada fue de 88,8%, empleando [Fe(II)]0 = 50 mg/L; [H2O2]0 = 50 mM; pH = 2,8 y T = 80ºC, mientras que en el óptimo económico ([Fe(II)]0 = 36 mg/L; [H2O2]0 = 45,5 mM; pH= 2,6 y T = 20 oC) se alcanzó un 53,9%. Por otra parte, se evidenció que incluso en condiciones adversas para el reactivo Fenton (pH sobre 6) se consiguió una remoción de COT del orden de 41%. Se encontró que la concentración de H2O2 y la temperatura de reacción tienen los efectos más significativos tanto en la eficiencia del proceso como en el costo de operación, lo que las convierte en variables a priorizar en la ejecución del tratamiento.
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