Lixiviates storage pond Diagram of the network for lixiviate collection and drainage
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The decomposition and transformation of landfill waste generates leachates, which are the liquid products generated during the anaerobic decomposition of municipal waste. The main pollutants in the leachates from the Garraf depot are basically non-biodegradable dissolved organic matter, ammonium, and, to a lesser extent, other water-soluble components. These leachates are duly collected and controlled via the corresponding drainage systems installed within the depot. The leachates drainage network is formed by a set of trenches and drainage tubes that collect the leachates from within the heart of the mass of waste and from the surface, channelling them by using gravity towards the main collectors that, at the same time, transport them and deliver them into the leachates storage and homogenisation reservoir. From this reservoir, located at the lowest part of the controlled depot, in the facilities and services zone, the leachates are pumped towards the treatment plant.
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