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Honorable Chairman and <br />Board of County Commissioners <br />9/16/91 <br />Page 20 <br />mode. This type of operation is suited to applications where septage is <br />dumped from hauler trucks for treatment or storage. An important advantage <br />of the cyclone degritter is that it generates fewer odors since no forced <br />aeration takes place. The primary design control factor is the flow velocity <br />which is controlled by the pumps that feed the degritting units. For the <br />cyclone degritter to operate efficiently, the solids feed concentration <br />should average' Tess than two percent. The solids concentration of the <br />septage is expected to be in the one to three percent range. Solids <br />concentrations of less than two percent can be maintained by the addition of <br />dilution water. Therefore. due primarily to lower costs and batch operation <br />of the system, the cyclone degritter is used as the basis of design. <br />Grease Concentration <br />A grease concentrator is a process unit that is appropriate for use with only <br />grease loads or mixed loads of septage and grease wastes. The principle of <br />the process is that the unit relies on the difference in specific gravities <br />between grease wastes and other materials. The grease wastes float to the <br />surface and are removed by a skimming device. The concentrated grease is <br />then hauled to the County, landfill and disposed of as a food service sludge <br />or recycled if that option becomes available. The underflow from the grease <br />concentrator is pumped to the sidestream treatment facility for treatment. <br />Belt Filter Press Dewatering <br />Dewatering is the removal of water from wastewater solids to achieve a volume <br />reduction greater than that achieved by thickening. Dewatering sludge from <br />M. VRB2/5 <br />