Existing odor control scrubbers used by the City and County of Honolulu wastewater facilities have been largely ineffective and costly to operate. As a result, the City began a study in 2000 to demonstrate the effectiveness of using biofilters to remove odor. This study determined
that ideal biofilter media is locally available in large quantities, is free or may be purchased at reasonable cost, and may even be derived from waste products generated from City activities (composted green waste and biosolids). The study also gathered data that could be used to design full-scale
biofilters. Based on the findings of this study, the City is now using biofiltration as an odor control strategy in traditional and innovative ways. Since biofilters traditionally require large open spaces for installation, innovative approaches are required to use biofilter technology
within the limited space that is usually available at existing facilities without impeding the movement of the operators and maintenance personnel.
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