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FINAL CLARIFICATION CHAMBER The final clarification chamber shall consist of 5 functionally independent zones operating together to provide satisfactory settling and clarification of the equalized flow. An inlet zone shall be provided and shall dissipate transfer turbulence at the flow inlet of the clarification chamber. Its performance shall also eliminate turbulence in other zones of the clarifier. Liquid shall be hydraulically displaced from the inlet zone to the sludge return zone. Hydraulic currents shall sweep settled sludge from the hoppered walls and return these solids via the inlet zone to the aeration chamber. As solids are removed,liquid is displaced to the hopper zone of the clarifier. In this zone,settling by gravity takes place. Three of the four sidewalls are slanted to form a hopper which directs all settled material back to the sludge return zone. Clarified liquid from the hopper OPTIONAL AERATOR FRESH AIR VENT ASSEMBLY zone shall be displaced into the final settling zone to EXTENSION RISER P 9 OPTIONAL BLUE CRYSTAL provide additional clarification of the liquid. The liquid SINGULAIR AERATOR CHLORINATION SYSTEM is finally displaced to the outlet zone for final filtration AERATOR OPTIONAL BIO-NEUTRALIZER and discharge from the system. Non-mechanical MOUNTING CASTING DECHLORINATION SYSTEM equalization of the flow, through all 5 independent UNDERGROUND POWER _ _ OPTIONAL BIO-KINETIC SUPPLY CABLE TOSINGULAIR SYSTEM EXTENSION zones,shall provide optimal settling and clarification. CONTROL CENTER RISER PRETREATMENT ° BIO-KINETIC SYSTEM BIO-STATIC® SLUDGE RETURN ACCESS COVER ® ° MOUNTING CASTING e -e A Bio-Static sludge return shall be installed into the — = FLOW LINE o cast-in-place opening(s) in the aeration/clarification EFFLUENT LINE chamber wall to provide positive return of settled solids. INLET LINE Aeration chamber hydraulic currents shall enter the a BIO-KINETIC SYSTEM sludge return(s)and be directed into the sludge return zone of the clarification chamber. The Bio-Static sludge PRETREATMENT ° CLARIFICATION CHAMBER CHAMBER return shall accomplish resuspension and return of settled solids without disturbing the clarified liquid in EXTENDED AERATION SECTION VIEW BIO-STATIC SLUDGE the final settling zone and outlet zone. CHAMBER RETURN MECHANICAL AERATOR Each Singulair aerator shall be installed in a concrete aerator mounting casting above the aeration chamber. Fresh air shall be supplied through a molded plastic vent assembly cast into the concrete access cover above the aerator. The Singulair aerator shall include plated mounting brackets,NEMA6 rated electrical connector,UL recognized fractional horsepower motor,molded plastic lifting handle, molded plastic air intake screens, LIFTING HANDLE FRESH AIR VENT ASSEMBLY molded plastic foam restrictor,stainless steel aspirator shaft and molded glass-filled nylon aspirator tip. The motor shall VENT ANTI-ROTATION contain recision manufactured o-ring type seals installed MOISTURE RESISTANT LUGS P 9 YP ELECTRICAL CONNECTOR between the motor shell and the machined aluminum endbells AERATOR BRACKET to insure watertight integrity is maintained. Molded Viton MOUNTING GROOVE elastomer shaft seals shall be utilized to protect the bearings VENTED COVER p from contamination. Only the stainless steel aspirator shaft and glass-filled nylon aspirator tip shall be installed in contact UNDERGROUND _ with the liquid. There shall be no submerged electrical motors, POWER CABLE. Q_ OPTIONAL AERATOR ROUTE DIRECTLY ° RISER CASTING bearings or fixed air piping in the aeration system. Singulair TO EDGE OF TANK. Q ° DO NOT ALLOW CABLE - e Q aerator motors shall be designed not to exceed the motor TO CROSS INSPECTION COVER ON TANK TOP. ° ce nameplate rating when installed and operated as AERATOR MOUNTING recommended for the system. The fractional horsepower ower Y p aerator motor shall be equipped with a foam restrictor to GROUT OR SYNTHETIC protect the motor against high water and foam. The motor SEAL MOUNTING CASTING AND POWER shall be 4 pole, 1725 RPM, 115 volt,60 Hertz,single phase, CABLE ENTRANCE. SINGULAIRAERATOR ball bearing constructed with a 1.0 service factor. It shall DESIGN FLOW LINE draw less than 4.0 amps when operating at the rated AERATION CHAMBER FOAM RESTRICTOR nameplate voltage. Aerator motors without LIL recognition have not demonstrated compliance with international electrical standards for safety and reliability and shall not be ASPIRATOR SHAFT ASPIRATOR TIP considered for this application.