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ABSTRACT: A pilot-scale biotrickling filter was installed at the Hyperion Treatment Plant in Los Angeles, California, to study hydrogen sulfide (odor) and volatile organic compound (VOC) removal from headworks waste air. The performance of the reactor was continuously monitored during a 10-month period. At an average empty bed gas residence time of 24 seconds, 10 to 50 ppm of hydrogen sulfide was consistently removed at greater than 98% efficiency, corresponding to an average volumetric elimination capacity of 5.2 g/m^sup 3^*h. Concentration profiles over the height of the reactor indicated nearly complete removal in the first section of the reactor, suggesting that elimination capacities up to 30 g/m^sup 3^*h could be obtained. The odor reduction (as dilution to threshold) was 98%, which correlated with the efficiency of removal of hydrogen sulfide as the primary pollutant. Volatile organic compounds were present at concentrations up to 225 ppb. Moderate but significant removal of toluene and benzene was observed when the biotrickling filter was operated with pH control to neutralize sulfuric acid production from hydrogen sulfide oxidation. Xylenes and chlorinated VOCs were not removed regardless of experimental conditions in the reactor. The results led to the conclusion that VOC removal is the limiting process in biotrickling filters for the simultaneous removal of hydrogen sulfide and VOCs at publicly owned treatment works. Water Environ. Res., 74, 557 (2002).
KEYWORDS: biotrickling filter, biological waste air treatment, publicly owned treatment works, hydrogen sulfide, odor, volatile organic compounds.
Introduction
The University of California at Riverside, the University of California at Davis, and the City of Los Angeles (California) Bureau of Sanitation Hyperion Treatment Plant have been testing pilot-scale biotrickling filters and biofilters as alternatives to chemical scrubbers for odor treatment and removal of volatile organic compounds (VOCs) from odorous waste gases (Converse et al., 2001, accepted for publication; Cox et al., 2001). Waste gas from the headworks at the Hyperion Treatment Plant (1.7 X 10^sup 5^ m^sup 3^/h) contains 10 to 50 ppm of hydrogen sulfide (HZS) as the principal odor-causing agent as well as a broad variety of chlorinated and nonchlorinated VOCs at concentrations ranging from 0 to 225 ppb. The current use of chemical scrubbers has proven to be satisfactory with respect to odor and hydrogen sulfide treatment. However, chemical...