Several past studies have indicated that off-gases resulting from soil and groundwater remedial operations can be treated economically by using biofilters to reduce air pollution. The efficiency of a biofilter depends on several factors such as: vapor retention time, uniformity of vapor flow, composition of the filter, type of microorganisms available for biodegradation, moisture content, and temperature. This paper presents the results of bench scale tests performed on two biofilters at room temperature to evaluate their performance at different gas flow rates and gaso-line contaminant concentrations. Based on the test results it was possible to identify some of the key parameters affecting the design and operation of biofilters and to develop rational procedures for the application of biofilters to the treatment of gaso-line vapors.
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