Abstract

HERNANDEZ-MEDINA, Nathalia; BEJARANO-AYALA, Stephanie A; MENA-GUERRERO, Natali  and  MACHUCA-MARTINEZ, Fiderman. Treatment of residual water from gas stations through catalytic ozonization. Ing. compet. [online]. 2019, vol.21, n.1, pp.23-34. ISSN 0123-3033.  https://doi.org/10.25100/iyc.v20i1.7652.

In this study the effectiveness of the process of heterogeneous catalytic ozonization (PHCO) in wastewater from a service station was investigated, with the use of a magnetic catalyst (magnetite) for the degradation of organic compounds that have double bonds (alkenes), aromatic compounds, phenolics and amines which were identified in the wastewater by mass spectroscopy. The influence of pH, the amount of catalyst and the reaction time were evaluated. It was identified through the FTIR tests carried out on magnetite that the catalytic properties remain unchanged during the heterogeneous catalytic ozonation process.

The POCH obtained a reduction of the organic load of the effluent of COD (60.92%) and of COD (74.76%) at a pH of 10, with an amount of magnetite of 0.3 g / L and a reaction time of 40 minutes. On the other hand, in the reaction time of 40 minutes at pH 3 and amount of magnetite 0.1 g / L, the turbidity decrease was 96.98%. In the same way it was determined for a pH of 3, with an amount of magnetite of 0.3 g / L and a time of 40 minutes a decrease in the concentration of total hydrocarbons, surfactants, fats oils which presented a decrease in their load of 19.74%, 56.67% and 15.50%, respectively. At the conclusion of the process, some products of the oxidation of alkenes were identified, such as: hexadecanes, octadecanes, dodecanes and acetates. Finally, heterogeneous catalytic ozonation is a technically effective method for the treatment of wastewater from service stations.

Keywords : Advanced oxidation techniques; catalytic ozonation, wastewater from a service station.

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