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Alternative for the Treatment of Leachates Generated in a Landfill of Norte de Santander–Colombia, by Means of the Coupling of a Photocatalytic and Biological Aerobic Process

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Abstract

In the present study, the use of heterogeneous photocatalysis TiO2/UV coupled to an activated sludge reactor was evaluated as an alternative treatment for the leachate coming from a Landfill, located in Cucuta (Colombia). TiO2 (Degussa P-25) between 100 and 600 mg.L−1 was used as a catalyst, semi-continuous type reactors for the photocatalysis, a batch for the biological stage, UV light with accumulated energies from 20 to 60 kJ.L−1 were also used, a constant concentration of H2O2 was used as an adjuvant in all tests. The research consisted of four main phases: leachate characterization, biological treatment, optimization of photocatalytic and AOP-biological coupling. For the optimization of the photocatalytic step, an experimental design was carried out through the statistical program Statgraphics Centurion XV of factorial type 3^2 (3 levels 2 variables), modeling the results by means of a response surface, the variables of the pH and the concentration of the catalyst were included, having this as input for the response of interest the percentage (%) of DOC removal. The biological process itself provided a removal of 38 and 24% for COD and DOC, respectively. The AOP-biological coupling provided a removal of 68 and 76% in terms of COD and DOC, respectively. Thus, the coupling significantly improves the overall efficiency of the process by more than 50%, which represents a promising improvement compared to the removal of organic matter for the treatment of the same type of water using only the biological process. The results show a viable alternative for the treatment of leachate because higher removal levels are achieved in residence times, which are considered shorter than the ones in conventional processes.

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  1. Departamento de Ciencias del Medio Ambiente, Facultad de Ciencias Agrarias y del Ambiente, Universidad Francisco de Paula Santander, Norte de Santander, Cúcuta, Colombia

    Dorance Becerra, Joseph Soto, Salvador Villamizar & Luisa Ramírez

  2. Facultad de Ingeniería, Universidad del Valle, Cali, Colombia

    Dorance Becerra & Fiderman Machuca-Martínez

  3. Universidad del Norte, Barranquilla, Atlántico, Colombia

    Joseph Soto & Salvador Villamizar

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  1. Dorance Becerra
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Becerra, D., Soto, J., Villamizar, S. et al. Alternative for the Treatment of Leachates Generated in a Landfill of Norte de Santander–Colombia, by Means of the Coupling of a Photocatalytic and Biological Aerobic Process. Top Catal 63, 1336–1349 (2020). https://doi.org/10.1007/s11244-020-01284-1

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