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Landfill Gas Energy Technologies

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Landfill Gas Energy Technologies ( landfill-gas-energy-technologies )

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Picture 9. Infrared Heaters. Source: INiG picture. 2.1.3 Leachate Evaporation The gas coming from the landfill can be used to evaporate leachate in situations where leachate is fairly expensive to treat. The principle of Leachate Evaporation Systems (LESs) is simple and direct: use LFG collected at the site as an energy source to evaporate H2O and combust the volatile organic compounds in the leachate. Depending on local requirements, the highly concentrated (hence very low volume) effluent is returned to the landfill or shipped off-site for disposal. Less concentrate and precipitate metals, primarily as salts, while stripping organics to a thermal oxidizer (e.g., flare) or reciprocating engine for destruction [15]. Evaporation is the only "treatment" technology available today that actually rids the water component from water-based waste streams. It can, for example, reduce the total volume of leachate to less than 5% of original volume [16]. Landfill-gas-fuelled evaporation is a technology that effectively integrates the control of landfill gas and landfill leachate. During recent years several forms of evaporation utilizing LFG as a fuel have emerged. The different types of evaporation fall into the categories of: • evaporation vessels; • spray-type dryers; • direct injection-devices. 35

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