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The disposal of urban waste into landfill has been used for long time because of its relatively low cost. One of most important drawbacks associated to such a practice is related to managing the leachate that is generated when water passes through the waste. Leachate is, in fact, the aqueous effluent generated by rainwater percolation through wastes, biochemical processes in waste cells and the inherent water content of the waste itself [1-4].The chemicalcomposition of landfill leachate is influenced by anumber of factors including seasonal precipitation,waste composition, and, mainly, the age of the landfill [5]. Consequently, the age of the landfill site is one of the mainvariables that affects the leachate characteristics [4,6]. Usually, young landfill leachates contain large amounts of biodegradable organic matter (i.e., volatile fatty acids) that decrease with increasing landfill age as a result of the anaerobic decomposition that takes place in the landfill site.
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