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<br /> <br />C. <br /> <br /> <br /> <br /> <br />Influent Screening <br />Influent Flow Equalization <br />Influent Pumping Station <br />Mixed Liquor Aeration <br />Secondary Sedimentation <br />De-nitrification System <br />Return Sludge System <br />Waste Sludge System <br />Effluent Filtration System <br />Ozone Disinfection System <br />TC2K Computerized Controls <br />I. Aerobic Solids Digestion <br />Solids Handing Process: <br />As an addition to the base Bio_PureTM process for Castello Estates, Waste Activated <br />Sludge from the process will be treated separately. The process selected for solids <br />stabilization is "Aerobic Digestion". Aerobic digestion is an extention of the extended <br />aeration activated sludge process utilized in the Bio_PureTM process. The process, as its <br />name implies, is aerobic and functions under free and dissolved oxygen conditions. <br />Basically this means it functions without obnoxious odors. Digestion will take place <br />under aeration in an enclosed digestion tank. Waste activated sludge from the Bio- <br />PureTm system will be periodically transferred to the digestion system for treatment, <br />reduction and stabilization. As illustrated in the BioPureTM Technical Description in <br />Section #1 of this report, waste activated sludge production in this process is considerably <br />less than standard activated sludge treatment systems. Periods of transfer will depend on <br />the overall cell growth rate in the BioPureTM system and will be determined shortly after <br />plant startup. In all probability the transfers will take place only once each week. This <br />operation, as are others within the overall process, will be controlled by 7-H's TC2K <br />Computerized Control and Monitoring System. Clarified supernatant from the aerobic <br />digestion process will be directed back to the plant influent equalization tank for re- <br />treatment in the plant. Stabilized and digested solids will be removed from the system in <br />liquid form at approximately 2.5% solids concentration. Removal will be by use of a <br />septic pumper truck. Frequency of pumping is calculated to be about once every three (3) <br />months. Each pumping will be in only the hundreds of gallons range, not thousands. <br />Wastewater Treatment Plant Effluent Quality: <br />In Section #1 of this report, the processes are explained in detail and identifies the <br />capabilities of this system to produce a very high quality effluent. The Castello Project is <br />4