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Ei•3UIPMENT 8PEC7i=IC.aTi0iV8 SECTION II SECONDARY TREAT`tE";T SYSTF~t PAGE J 6. AER.4TI0`I CFi.1ttBER 6.1. There shall be supplied, an aeration chamber to work in conjunction •~ith the clarifier chamber. The aeration chamber shall conform to the follow- ing specifications: 6.2 The aeration chamber shall be of sufficient capacity to provide a ninimum ~ of 24 hours retention of the average daily floe, and/or a minimum of 80 cubic feet per pound of GODS of applied loading. The vessel shall 'oe so shaped on each side to prevent sludge accumulation, to enhance rotation of the vessel contents, and to prevent scum and froth accumulation. To insure maximum retention and eliminate short circuiting of rav sewage particles, the aeration chamber shall be constructed with air diffusers, placed longitudinally along one side of the chamber so as to, in con- junction with the E1ow control baffles, enhance the spiral rotation of the chamber contents. To insure adequate circulation velocity the proportion of the chamber vidth to depth, in the direction of rotation, shall not exceed 1.33 to 1. The velocity of rotation shall be sufficient to scour the bottom and prevent sludge Filleting as yell as to prevent the escape to the surface of miniscule air diffusion bubbles and by so causing their entrapment to provide maximum oxygenation efficiency. 6.7 An air distribution manifold shall be installed longitudinally on one , side of the tank with diffuser drop assemblies connected thereto. Each diffuser drop assembly shall be equipped with an air regulating and/or shutoff valve, a disconnecting union and a diffuser bar with non- clog air diffuser nozzles mounted thereon at approximately 6" centers. With this spacing, the air flow per diffuser shall range from 1 to ~ C:';t. This minimum air velocity shall be maintained to insure sufficient velocity for self-cleaning. The diffusers shall be parallel to and near the base of the vessel side wall and ac an elevation •.rhich will provide the optimum diffusion and mixing of the vessel contents. The oxygen transfer capacity of each diffuser shall be such that an adequate sunoly of oxygen will be maintained in the aeration chamber to meet treatment requirements of the design sewage load. 7. CLARIFIER CHA.`iBER 7.1 There shall be furnished a clarifier chamber to work in conjunction Frith the aeration chamber of that system. The clarifier shall conform to the followin;, specifications: ~IYDAD•AE~O~IC';