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a valve to regulate the rate of return. The scum intake will have an adjustment assembly <br />that will enable exact positioning of the skimmer at water level. <br />K. Chlorine Contact Chamber <br />A chlorine contact chamber will be provided for proper disinfection of the treated <br />wastewater prior to discharging from the plant. The chlorine contact tank will have 30 <br />minutes of retention based on the design flow. Sufficient flow baffles will be supplied to <br />ensure proper mixing of the chlorine solution with the plant effluent. A tablet style <br />chlorinator feeder will be provided for use with Sanuril 115 tablets. <br />L. Air Diffusion System <br />An air distribution manifold constructed of rectangular hollow steel tubing with diffuser <br />drop assemblies will be installed longitudinally on one side along the entire length of the <br />plant. <br />Each diffuser drop assembly will be equipped with an air regulation and/or shut-off cock <br />valve, a disconnecting union and a diffuser bar with air diffuser nozzles mounted thereon. <br />The diffusers will be parallel to and near the base of the vessel sidewall and at the proper <br />elevation providing optimum diffusion and mixing of the vessel contents. <br />Each air diffuser will be constructed with an integral air check diaphragm designed to <br />handle a wide range of airflow. The oxygen transfer capacity of each diffuser will be <br />such that an adequate supply of oxygen will be maintained in the aeration chamber to <br />meet treatment requirements of the design sewage load. <br />M. Blower/Motor Units <br />To meet the air requirements of this wastewater treatment system, two (2) positive <br />displacement blower/motor units will be supplied. The blower/motor units shall be <br />mounted at a remote location as indicated on the plans. The blower/motor units will be <br />capable of providing a minimum of 2050 cubic feet of air per pound of BOD5 plant loading. <br />Each blower unit will be capable of delivering 73 CFM when operating at 5 PSI. The <br />motor will be 3 HP, ODP type, for operation on 230 volt, 3 phase, 60 cycle service. <br />Each blower/motor unit assembly will be mounted on a molded fiberglass base. The <br />base structure will be adequately reinforced to support the blower/motor unit. <br />The blower/motor will be enclosed within a molded fiberglass weatherproof hood <br />mounted to the base. The fiberglass -locking hood is designed for easy access to service <br />the unit. <br />To help reduce blower vibration and noise, the blower/motor base will be mounted on <br />vibration dampeners. <br />P6013'Afest L2ne MHP 4 <br />