Ingeniería ambiental

 

Evaluation of adsorption and Fenton-adsorption processes for landfill leachate treatment

 

Evaluación de los procesos de adsorción y Fenton-adsorción para el tratamiento de lixiviados de relleno sanitario

 

L. San Pedro-Cedillo¹*, R.I. Méndez-Novelo¹, M.N. Rojas-Valencia², M. Barceló-Quintal³, E.R. Castillo-Borges¹, M.R. Sauri-Riancho^†, J.M. Marrufo-Gómez³

 

¹ Faculty of Engineering, Autonomous University of Yucatán. Av. Industrias No Contaminantes por Periférico Norte S/N. Mérida, Yucatán, México. * Corresponding author. E-mail: lilia_83@hotmail.com Phone: 52 (999) 9860902, Fax. 52 (999) 9410189

² Engineering Institute of National Autonomous University of México. Circuito Escolar s/n, Ciudad Universitaria, Delegación Coyoacán, México D.F

³ Faculty of Chemistry, Autonomous University of Yucatán. Calle 43 No. 613 x Calle 90 Col. Inalámbrica. C.P. 97069. Mérida, Yucatán, México.

 

Received July 4, 2014;
Accepted August 8, 2015.

 

Abstract

The objective of this research was to compare the adsorption and Fenton-adsorption treatments for the removal of contaminants in leachate from landfills and thus determine the most efficient one. The adsorption process with granular activated carbon was tested in two types of samples: raw leachate and leachate treated by Fenton. The results showed color, chemical oxygen demand (COD), total nitrogen and total organic carbon (TOC) removal rates higher than 99% through the Fenton-adsorption process, while total nitrogen, COD, color and TOC removal rates of 81, 89, 92 and 93 %, respectively, were obtained through the adsorption process on the raw leachate. Gas chromatography coupled to mass spectrometry (GS-MS) was used to found that: the main organic compound in the leachate produced in the landfill from Merida city, Yucatan, Mexico, is bisphenol-A, which was removed only during the adsorption stage of the Fenton-adsorption process. Furthermore, the biodegradability index (BI) increased from 0.084 to 0.476 through adsorption and up to 0.82 through the Fenton-adsorption treatment.

Keywords: activated carbon; adsorption; bisphenol-A; Fenton; leachate.

 

Resumen

El objetivo de esta investigación fue comparar los tratamientos de adsorción y Fenton-adsorción para la remoción de contaminantes en lixiviados de rellenos sanitarios y determinar el más eficiente. El proceso de adsorción con carbón activado granular fue probado en dos tipos de muestras: lixiviado crudo y lixiviado tratado con Fenton. Los resultados muestran que la remoción de color, demanda química de oxigeno (DQO), nitrógeno total y carbón orgánico total (COT) es superior a 99% con el proceso Fenton-adsorción, mientras que con el proceso de adsorción la remoción de nitrógeno total, DQO y COT fue de 81, 89 y 92%, respectivamente. Mediante el uso de cromatografía de gases acoplada a espectrometría de masas se encontró que el bisfenol-A es el principal compuesto orgánico presente en el lixiviado producido en el relleno sanitario de la ciudad de Mérida, Yucatán, México. Este compuesto fue removido sólo durante la etapa de adsorción del proceso Fenton-adsorción. Asimismo, el índice de biodegradabilidad (IB) se incrementó de 0.084 a 0.476 mediante el tratamiento del lixiviado con adsorción, y 0.82 con el tratamiento Fenton-adsorción.

Palabras clave: adsorción; bisfenol-A; carbón activado granular; Fenton; lixiviado.

 

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