| Autor: |
Hernández-Contreras, Gisela Inés, Hernández-Berriel, María del Consuelo, de la Rosa-Gómez, Isaías, Carreño-de León, María del Carmen, Márquez-Benavides, Liliana |
| Zdroj: |
Journal of Solid Waste Technology & Management; Nov2015, Vol. 41 Issue 4, p573-581, 9p |
| Abstrakt: |
In Mexico, the most used form of disposal for the municipal solid waste (MSW) is the landfill. The degradation of MSW produces biogas and leachate which affect the environment, such degradation results from the activities of microbial consortia. There are few studies on the microbial density of this process, therefore the aim of this work was to determine by the "Most Probable Number" method the growth dynamics of fermentative bacteria (FB) and methanogenic bacteria (MB) involved in the accelerated degradation of MSW. In order to determine the above, ten laboratory-scale bioreactors (LSB) were operated at 26°C±2, with and without the recirculation of leachate at 40% volume rate once per week over five months. The LSB were operated and dismantled monthly in order to quantify the bacteria in samples of MSW and leachate. The results showed that in the recirculated leachate (RL) FB were predominant and both bacteria decreased with the recirculation. While in drained leachate (DL) the MB were initially higher and decreased when the FB started increasing until becoming predominant. The hydrolytic-acidogenic phase was identified from days zero to 38 and methanogenic phase started on day 39 according with the dynamics of bacterial populations in the MSW and DL samples of the LSB with leachate recirculation. The LSB without recirculation leachate remained in the hydrolytic-acidogenic phase. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
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