Optimization of the treatment of sanitary landfill by the ozonization catalysed by modified nanovermiculite in a rotating packed bed

Conventional processes fail to improve the treatment of landfill leachate. Thus, the use of advanced molecular ozone oxidation processes combined with Rotating Packed Bed (RPB) reactor provides greater gas diffusion to the medium in a catalytic bed with vermiculite and it is a process likely to remo...

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Bibliographic Details
Published in:	Journal of cleaner production Vol. 249; p. 119395
Main Authors:	Braga, Washington Luis Moreira, de Melo, Diego Henriques Aguiar, de Morais, Daiana, Samanamud, Gisella Rossana Lamas, França, Alexandre Boscaro, Finzi Quintão, Cristiane Medina, Loures, Carla Cristina Almeida, de Urzedo, Ana Paula Fonseca Maia, Naves, Luzia Lima Rezende, de Freitas Gomes, José Henrique, Naves, Fabiano Luiz
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 10-03-2020
Subjects:	Landfill leachate treatment Ozonation Rotating packed bed Vermiculite Ozonation Rotating packed bed Landfill leachate treatment Vermiculite
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Summary:	Conventional processes fail to improve the treatment of landfill leachate. Thus, the use of advanced molecular ozone oxidation processes combined with Rotating Packed Bed (RPB) reactor provides greater gas diffusion to the medium in a catalytic bed with vermiculite and it is a process likely to remove organic discharge. This study aimed to increasing the ratio between biochemical oxygen demand (BOD) and chemical oxygen demand (COD) as well as improving color removal through a modified vermiculite-catalyzed ozonation process in an RPB reactor. The factors of rotation of the bed in the reactor, initial pH and ozone flow were analyzed through experimental design represented by the central composite design (CCD) and later optimized through the Normal Boundary Intersection (NBI) algorithm. In the optimized operational conditions: rotation of 915 rpm, pH of 5.8 and ozone flow of 3.9 L min−1, the COD and color removal were 16.5% and 40.54%, respectively. An increase in biodegradability (BOD5/COD), from 0.13 to 0.49, under optimized conditions, demonstrated the efficiency of the process as a pretreatment of landfill leachate enabling further biological treatment. [Display omitted]
ISSN:	0959-6526 1879-1786
DOI:	10.1016/j.jclepro.2019.119395