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ODOR CONTROL STUDY from the headspace under the covers . A new 2-stage scrubber system would be required to scrub the odorous air. The scrubbers would be approximately 3 feet in diameter. These new scrubber facilities would be designed in accordance with National Fire Prevention Association ( NFPA ) Standard 820 . The overall scrubber removal efficiency would be expected to be at least 90 % efficiency and perhaps greater than 95 % . . The construction and engineering costs for this alternative are estimated to be approximately $450 , 000 . The operating costs are estimated to be $ 17 , 000 per year, mostly for chemicals and power. 3 . 1 . 3 Cover and Control with New Biofilter Instead of using a new scrubber to treat emissions from the Anoxic Tank , a modular or custom biofilter could also be used to treat the air from this source . Biofilters consist of porous , moist media , which support the growth of microorganisms . Odorous gas is passed through the biofilter, where odorous compounds are absorbed into the liquid film at the surface of the media and adsorbed on the media and microorganisms . As the odorous compounds come into contact with the surfaces inside the biofilter, microorganisms utilize nutrients in the media to biologically oxidize the odorous compounds . Biofilters are considered a broad -spectrum odor control technology. Biofilters are capable of achieving high removal efficiencies for 1-12S and many VOCs . Organic sulfur removal has been generally good , but less predictable . Compost, bark , sand , peat, and soil are often used as media for biofilters . A modular biofilter is a packaged unit that contains all air and water distribution systems , biofilter media , fans , and ancillary equipment associated with the biofilter. The unit is pre-assembled and shipped on a skid . It is ready to be installed as an end -of-duct treatment device . BIOREM , BioCube , US Filter, and others manufacturers make modular biofilters . The advantages and disadvantages of modular biofilters include the following : Advantages • Easy construction and installation • Small footprint • Low operations and maintenance costs • Good 1-12S and VOC control • Able to be relocated , if necessary Disadvantages • Possible poor removal of organic sulfides • Periodic replacement of media • Relatively high capital costs A custom biofilter is a site-specific biofilter that is constructed of readily available commercial building materials . The materials are assembled on -site , in a sequential manner. Customized biofilters are generally larger than manufactured biofilters because PM61 16 Indian River County, Central Wastewater Treatment Facility PBS&J #071230, February 2003