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Honorable Chairman and <br />Board of County Commissioners <br />9/16/91 <br />Page 18 <br />the treatment facility. The holding tank is equipped with two torque flow <br />pumps which transfer the septage from the holding tank to the degritting <br />units. Due to the wide variations in solids concentrations of the septage, <br />the holding tank provides for dilution water additions to allow adequate <br />mixing and pumping of the incoming wastestreams. Following the holding tank, <br />there is a degritting system to remove sand and other fine particles not <br />removed by screening. After degritting, the septage is discharged into the <br />sludge holding tank. <br />The grease holding tank provides over 40 hours of storage capacity for the <br />incoming grease. The tank has a rotary lobe pump to transfer the grease from <br />the holding tank to the grease concentrator unit. One rotary lobe pump is <br />provided for backup. but is not installed. <br />The sludge holding tanks provide 25 hours of storage capacity for the <br />incoming waste activated sludge. The sludge holding tanks are divided into <br />two separate holding tanks with a storage capacity of 12-1/2 hours each. The <br />design of sludge holding tanks provides two rotary lobe pumps plus one backup <br />rotary Tobe pump to transfer the sludge to the solids processing building. <br />Table 4 summarizes the design criteria for the receiving facilities. <br />TREATMENT FACILITIES <br />Septage Degritting <br />Cyclone degritters are effective in the pretreatment of septage to remove <br />grit. Cyclone degritters are designed to be operated in the batch operation <br />M. VRB2/5 <br />