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The results of a field-scale experiment on biofiltration of landfill gas (LFG), which aimed to remove selected volatile organic compounds (benzene, toluene, ethylobenzene, xylenes and p-cymene), are presented in the paper. Examinations were carried out in the closed municipal solid waste landfill in Kraśnik (Poland). The experimental biofilter, situated in a neighborhood of the landfill, was filled with a mixture of a municipal solid waste compost and expanded clay pellets (1:1 volumetric ratio). The aim of the experiment was to evaluate the removal efficiency of BTEXs and p-cymene from landfill gas in various conditions. The research lasted 10 months (from June 2012 to March 2013). Average concentrations of benzene, toluene, ethylobenzene, o-xylene, m-xylene and p-cymene in LFG entering the biofilter were: 3.27; 2.43; 8.84; 5.10; 7.52 and 9.27 μg m-3, respectively. All of these trace gases concentrations were not practically detected in LFG leaving the biofilter.
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