Volume 29, Issue 3 p. 43-49
RESEARCH ARTICLE

Utilization of UV-A and UV-C radiation in advanced oxidation processes with the intention of removing color and organic matter from the gross leachate of a stabilized sanitary landfill

Samara Teixeira Pereira

Corresponding Author

Samara Teixeira Pereira

PhD student in Civil and Environmental Engineering, Technology Center, Federal University of Paraíba, UFPB, João Pessoa, Brazil

Correspondence

Samara Teixeira Pereira, Civil and Environmental Engineering, Technology Center, Federal University of Paraíba, UFPB, João Pessoa, Brazil.

Email: samaraeng.amb@gmail.com

Search for more papers by this author
Elisângela Maria Rodrigues Rocha

Elisângela Maria Rodrigues Rocha

PhD in Civil Engineering and Environmental Sanitation, Technology Center, Federal University of Ceará, UFC, Fortaleza, Brazil

Search for more papers by this author
Elson Santos da Silva

Elson Santos da Silva

Master in Renewable Energies, Center of Renewable Energies, Federal University of Paraíba, UFPB, João Pessoa, Brazil

Search for more papers by this author
Giulia Beatriz Mota da Silva

Giulia Beatriz Mota da Silva

Students in Environmental Engineering, Technology Center, Federal University of Paraíba, UFPB, João Pessoa, Brazil

Search for more papers by this author
Maria Luisa Palitot Remigio Alves

Maria Luisa Palitot Remigio Alves

Students in Environmental Engineering, Technology Center, Federal University of Paraíba, UFPB, João Pessoa, Brazil

Search for more papers by this author
First published: 17 June 2020

Abstract

The present work investigated color and biochemical oxygen demand (COD) removal from treated landfill leachate via advanced oxidative processes (AOPs) artificially emitted. The AOP H2O2/UV, TiO2/UV, and photolysis were tested in two bench-scale photoreactors: The first one with UV-C lamp and the other with UV-A lamp associated or not with coagulation / flocculation pretreatment. Crude leachate samples with pH ranging from 8 to 3 were used, and time varied in 30, 45, and 60 minutes. Experiments were performed in two stages: step 1 with a 20 mL volume from each sample and step 2 with repetition of the best results from the previous step, adopting the 150 mL volume. In step 1, the AOP applied in the crude leachate sample showed the best results, standing out H2O2/UV-C with 30 minutes and TiO2/UV-A with 60 minutes. In step 2, H2O2/UV-C had a 60% color removal and 25% COD reduction, while TiO2/UV-A had a 10% color removal and 20% COD reduction. Therefore, the H2O2/UV-C process was the most efficient, because the complex characteristics of the effluent interfered in the TiO2/UV-A efficiency, but it is necessary to eliminate the process interferences. The use of artificial radiation is a viable alternative; however, it can be costly, being relevant in the associations between processes with artificial UV and solar UV, as the natural radiation becomes more attractive and allows the process operating costs reduction.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.