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Picture 10. Leachate Evaporation System. Source [7]. Evaporation may offer the potential to deal with leachate problem effectively in one principal unit operation at the landfill site. In addition, two principal by-products of landfill operations, leachate and gas, could be used together beneficially in one process [17]. After evaporation the volume of the concentrated residual will be a small fraction of the original leachate and could be recycled back to the landfill. Volatile components in leachate that go in the exhaust air stream could be treated separately, if required [18]. Conventional treatment of landfill leachate may require several unit operations to remove the various contaminants to acceptable levels. Leachate treatment by evaporation may offer the advantage of dealing with the leachate on the landfill site by employing fewer unit operations as compared to a conventional treatment process composed of several sequential unit operations. Evaporation allows separation of volatile from non-volatile components. Solids and metals can be concentrated into a small volume after evaporation. [18]. Landfill gas produced by the decomposition of landfill refuse might be used as an energy source for evaporation of leachate [17]. Leachate evaporation is a good option for landfills where leachate disposal in a publicly owned treatment works plant is unavailable or expensive. Evaporators are available in sizes to 3 treat 38 - 114 m /day of leachate. LFG is used to evaporate leachate to a more concentrated and more easily disposed effluent volume. 39PDF Image | Landfill Gas Energy Technologies
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