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Honorable Chairman and <br />Board of County Commissioners <br />9/16/91 <br />Page 24 <br />Odor Control <br />Odor control equipment is provided for the following processes: <br />o Solids Processing Building <br />o Sludge, Septage, and Grease Receiving/Pretreatment <br />o Belt Filter Presses <br />o Equalization Basin <br />o Grease Concentrator <br />The basis of design is a counter -current, packed -tower wet scrubber system. <br />This system is capable of reducing the hydrogen sulfide concentrations to <br />Tess than one part per million. The system utilizes two towers followed by <br />discharge to the atmosphere. A sodium hydroxide solution is fed through the <br />tower packing and interacts with the odorous air flowing in the opposite <br />direction. The air then travels through a second scrubber which utilizes a <br />chlorine solution as a scrubbant. The air travels through a mist eliminator <br />at the top of the tower before discharge to the atmosphere. <br />Sidestream Treatment and Equalization <br />Sidestream treatment is necessary to handle the underflows and supernatants <br />of the various sludge, septage. and grease treatment processes. Treatment of <br />the Regional Sludge Facility sidestream will be provided by existing capacity <br />at the Central Subregional WWTP. As additional capacity is required, an <br />expansion may be warranted. <br />M. VRB2,'5 <br />