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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
Author(s) -
Pereira Samara Teixeira,
Rocha Elisângela Maria Rodrigues,
da Silva Elson Santos,
da Silva Giulia Beatriz Mota,
Alves Maria Luisa Palitot Remigio
Publication year - 2020
Publication title -
environmental quality management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.249
H-Index - 27
eISSN - 1520-6483
pISSN - 1088-1913
DOI - 10.1002/tqem.21679
Subject(s) - leachate , chemical oxygen demand , effluent , advanced oxidation process , chemistry , flocculation , ozone , ultraviolet , volume (thermodynamics) , organic matter , photocatalysis , pulp and paper industry , nuclear chemistry , environmental chemistry , environmental science , materials science , environmental engineering , wastewater , organic chemistry , catalysis , engineering , physics , optoelectronics , quantum mechanics
The present work investigated color and biochemical oxygen demand (COD) removal from treated landfill leachate via advanced oxidative processes (AOPs) artificially emitted. The AOP H 2 O 2 /UV, TiO 2 /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 H 2 O 2 /UV‐C with 30 minutes and TiO 2 /UV‐A with 60 minutes. In step 2, H 2 O 2 /UV‐C had a 60% color removal and 25% COD reduction, while TiO 2 /UV‐A had a 10% color removal and 20% COD reduction. Therefore, the H 2 O 2 /UV‐C process was the most efficient, because the complex characteristics of the effluent interfered in the TiO 2 /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.