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process in a slightly modified enclosed flare [Organic Waste Technologies, Inc. (OWT)]. Another variation combusts the evaporated vapours and LFG in an RIC (Reciprocating Internal Combustion) engine to produce electricity; the waste heat from the engines is used to aid in evaporating the leachate (Power Strategies L.L.C.) [15]. OWT offers two LESs. The LES is marketed through its Omni-Gen Technologies, Inc. subsidiary. OWT is also a licensee of the Technair system (Italy). A view of the LES is 3 presented in picture 10. A process flow diagram for a 38 m LES with typical flow quantities is presented in figure 9. Leachate is continuously fed to the evaporator vessel. A LFG-fired burner introduces hot gas into the leachate as fine bubbles below the surface (gas sparging) and direct heat transfer occurs between the liquid and hot gas. The leachate is maintained at o 82 – 88 C. Direct contact of hot gases with leachate acts to strip most of the organic compounds within the leachate to the vapour phase. Organics are transferred from the liquid leachate phase to the exhaust vapour phase by a process analogous to air stripping (i.e., contaminants partition between the vapour and liquid phases according to their respective vapour pressures and concentrations within the liquid). As the process occurs at elevated temperatures, the stripping action is generally more efficient than that obtained with most conventional air strippers operating at ambient temperatures. Figure 9. Leachate Evaporation Diagram. Source: [7]. 38PDF Image | Landfill Gas Energy Technologies
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