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• ~ <br />• ~ <br />• <br /> IEC3LIIPMENT SPEC:~IC T7CN8 - <br />SECTIOV II SECO?7DARY TREAT`fE"IT SYSTc t p?C'c 4 <br />7.2 The clarifier chamber shall be of such size as to provide a minimum of <br /> four (4) hours retention, based upon the same design flow rate govern- <br />. ing the aeration chamber, and shall have proper baffling to prevent <br /> short circuiting and to provide maximum uniform retention. The clarifier <br /> inlet shall be baffled to prevent short circuiting and provide maximum <br /> uniform solids settling area. The bottom of the chamber shall be forn:ed <br /> into an inverted pyramidal hopper or hoppers. The flat bottom area of <br /> each hopper shall not exceed one square foot. The slope of the hopper <br /> walls shall not be less than 1.7 vertical to 1.0 horizontal. Sett'_ed <br /> sludge shall be returned from the clarifier sludge hopper to the aeration <br /> chamber by the positive sludge return system, consisting of an airlift <br /> pump. The clarifier effluent shall pass over the edge of the baffled <br /> adjustable effluent weir into the effluent trough and then out of the <br /> chamber. <br />8. SLUDGE RECIRCULATION S'{STEM <br />8.1 There shall be installed within the clarifier chamber, a positive sludge <br /> recirculation system, consisting of N/A ,_ diameter airlift sludge <br /> return assembly, meeting the following specifications: The airlift pump <br /> system shall have the recirculation capacity ranging from 07. to 150: of <br /> the design flow. The air line supplying air to the pump shall be equipped <br /> with a needle valve varying the capacity of the pump. The airlift pump <br /> shall be firmly supported and shall be equipped with a cleanout plug to <br /> allow for easy cleaning and maintenance. <br />9. SCUM RECIRCULATION SYSTE"t <br />9.1 There shall be installed within the clarifier chamber a positive scum and <br /> skimming recirculation system consisting of N A airlift skimming device(s) <br /> meeting the following specifications: 'The skimming device shall 6e of <br /> the positive airlifC pump type, located in a position to skim and return <br /> floating material to the aeration chamber. The air line supplying air to <br /> the skimming device shall be equipped with a needle valve to regulate the ~ <br /> rate of return. The scum intake shall be equipped with an adjusta~le <br /> assembly which will enable exact positioning of the skimmer at water level <br /> without placing a hand under the water. <br />10. AIR SUPPL't BLO[JF.R MOTOR IPIITS <br />10.1 A total of 2 positive displacement blower motor unit(s) shall Se <br /> supplied, capable of providing a minimum of 2,500 cubic feet of air <br /> per pound of 80 D5 plane loading, and/or a minimum of 3 CF?1 per lineal <br /> foot of aeration tank length to meet the air requirement of the total <br /> system. Tl~e blower(s) are to be located on the plant as shown on tie <br /> plans. <br /> }IYD"~0•~C~OgIC~ <br /> •IIP IIYY ~{ <br />