RESEARCH ARTICLE


Influence of Recycling Different Leachate Volumes on Refuse Anaerobic Degradation



Ma. C. Hernández-Berriel1, 2, C. Mañón-Salas3, J.M. Sánchez-Yáñez1, J. Lugo-de la Fuente4, L. Márquez-Benavides*, 1
1 Universidad Michoacana de San Nicolás de Hidalgo, San Juanito Itzícuaro S/N, Col. San Juanito Itzícuaro, Morelia, Michoacán-México. C.P. 58302, México
2 Instituto Tecnológico de Toluca, Av. Tecnológico S/N Ex-Rancho La Virgen, Metepec, Edo. de México-México, C.P. 52140, México
3 Universidad Autonoma de Baja California, Calle de la Normal S/N, Blvd. Benito Juárez, Col. Insurgentes Este, Mexicali, Baja California, Norte, México
4 Universidad Autónoma del Estado de México, Facultad de Ciencias, Instituto Literario 100. Toluca, Edo. de México, C.P. 50000, México


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© 2010 Hernández-Berriel et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Universidad Michoacana de San Nicolás de Hidalgo, San Juanito Itzícuaro S/N, Col. San Juanito Itzícuaro, Morelia, Michoacán-México. C.P. 58302, México; Tel: 52(443) 3340475, Ext. 116; E-mail: lmarquez@umich.mx


Abstract

The aim of this work was to determine the appropriate moisture regime, attained by leachate recycling, to achieve the highest municipal solid waste (MSW) biodegradation rate. To this end, leachate characteristics, methane production rate and changes in degraded refuse were studied. Twenty laboratory-scale bioreactors were loaded with MSW from the landfill of Pátzcuaro (Mexico), four were used as controls and sixteen were operated under leachate recycling to achieve moisture content regimes (%MC) of 50, 60, 70 and 80%, bioreactors operated for 264 days. Hydrolysis, acidogenic and methanogenic phases were determined and studied. ANOVA and Tukey’s HDS tests revealed significant differences in leachate concentration characteristics when using different recycling volumes. Maximum methane production rate was found in the 70% MC regime, whereas the highest volume was found to produce a wash out effect in the refuse matrix. Also, the highest total volatile solids removal was found in the solid phase of the 70% MC regime.

Keywords: Municipal solid waste, leachate, moisture content, methane.