Aplicación de foto fenton (VIS) para la remoción de sulfuros y DQO en aguas residuales de curtiembre

Abstract

Leather production is constituted as an activity of central importance, not only for the economy but for a social and cultural meaning, however, the quality of the waterbodies in which is poured the wastewater proceeded from this industry is affected by the high amount of pollutant load. Objective: decrease the level of concentration of sulfurs and COD, evaluating physical and chemical conditions of the tannery wastewater without treatment, clarified and treated. Materials and methods: an advanced oxidation process is proposed for the degradation of these substances, dosing peroxide of hydrogen and ferric chloride as catalyst (Fenton's reagent) in the presence of LED lamps of visible light as source of energy for the pollutant’s photolysis. The experimental design was realized for a reaction time of 6 hours, there was analyzed the effect of the pH and the dose of peroxide (H2O2 and FeCl3) and the responses surfaces were percentage of sulfur and DQO removal from wastewater treatment. Results: It was obtained an optimal removal of 73,5 % for sulfurs in conditions of initial solution pH of 5 and dose of H2O2 of 40µl and 56 % of COD´s removal for an initial pH of 6 with applied dose of H2O2 of 60µl, although it is remarkable that the response variables depend and change in relation to the processes’ factors according the ANOVA statistics results. Conclusion: For sulfur removal the best results are obtained when the initial pH value range between 5 and 6 units, while for COD, the removal percentage depends on the H2O2 applied doses, besides, the use of visible radiation supplied by LED lamps to intensify the oxidation process turns out favorable according with the stoichiometrical analysis.

Keywords:

DQO

industria

radiación

sulfuro de hidrógeno

tratamiento de aguas residuales

COD

industry

radiation

sulfur

wastewater treatment

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