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28-05-2020 | Original Paper

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

Authors: Dorance Becerra, Joseph Soto, Salvador Villamizar, Fiderman Machuca-Martínez, Luisa Ramírez

Published in: Topics in Catalysis | Issue 11-14/2020

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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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Title: 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
Authors: Dorance Becerra
Joseph Soto
Salvador Villamizar
Fiderman Machuca-Martínez
Luisa Ramírez
Publication date: 28-05-2020
Publisher: Springer US
Published in: Topics in Catalysis / Issue 11-14/2020
Print ISSN: 1022-5528
Electronic ISSN: 1572-9028
DOI: https://doi.org/10.1007/s11244-020-01284-1

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