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Operating Principle The STS Tablet Feeder is a one-piece system which operates on the flow-through principle to provide a constant, controlled dosage of chlorine to the effluent of wastewater treatment plants. The entire flow of treated wastewater passes into the tablet feeder through the inlet pipe. As the stream of water flows past the feed tubes containing the SANURIL tablets, active chlorine is released into the wastewater by the dissolving action of the water stream in contact with the tablets. Each tablet feeder is furnished with a selection of weir plates, with weirs ranging in size from 1 to 3 inches in width for insertion at the outlet end to control the internal water level, depending upon plant capacity and the residual chlorine required. Each weir plate is calibrated, enabling the user to tell, instantaneously, the flow rate of the plant. The weir in turn automatically controls the chlorine concentration regardless of surges of wastewater flow. As the incoming flow rate increases, the water level in the tablet feeder rises, immersing a greater number of SANURIL tablets. When the incoming flow decreases, the water level in the tablet feeder drops, exposing fewer tablets to the water. Since the amount of SANURIL tablets dissolved depends on the number of tablets immersed in the water, the chlorine concentration remains constant regardless of the rate of waterflow through the tablet feeder. The chlorinated wastewater then flows into the chlorine contact tank where it is held for the required time to permit effective bacteria killing action. Each tablet feeder is furnished with four feed tubes. The number of tubes to be filled with SANURIL tablets is determined by the average daily flow -rate and the required residual chlorine content or dosage. Specifications The tablet feeder is made of tough, corrosion resistant rotomolded polyethylene. Compact and easy to handle, the tablet feeder measures 26 inches long, 18 inches wide and 16 inches deep. The feed tubes are 24 inches long with an outside diameter of 3 1/2 inches. Each tube holds 29 SANURIL tablets which measure 2-5/8 inches in diameter and are 13/16 of an inch thick. The Model 1000 has a 6 inch diameter inlet pipe size, the Model 1001 has a solid inlet end for easy field adaptation to the outlets of existing plants. Installation The EIC Tablet Feeder is designed for installation in any sewage plant having sufficient space to permit mounting. The tablet feeder can be located on or preceding the chlorine contact tank as near as possible to the inlet so as to channel entire plant flow through the tablet feeder before it enters the chlorine contact tank. Other Applications In addition to wastewater chlorination, the Model 1000 & 1001 Tablet Feeder can also be used for dechlorination and the chlorination of drinking water. For dechlorination, the Model 1000 & 1001 is used in conjunction with the EIC D- CHLORTM tablets. These tablets are a sodium sulfite based formulation having compatible dimensions for use in the EIC Model 1000 & 1001 Tablet Feeder. For drinking water chlorination, the Model 1000 & 1001 is used in conjunction with the STS AQUAWARD® chlorinating tablets. The AQUAWARD tablets are a calcium hypochlorite based formulation also having dimensions compatible for use in the STS Model 1000 & 1001 Tablet Feeder. This system is ideal for open channel flow operation and/or remote installations where other methods of disinfection are not practical or economical. For additional information and literature on the D -CHLOR and AQUAWARD Systems, please contact Exceltec. 1110 Industrial Boulevard • Sugar Land, Texas 77478 Telephone: 800 621 9189 or 281 240 6770 Fax: 281 240 6762 • e-mail: dvega@severntrentservices.com EIC -6271 12/02 RMIS West Lane MHP 16 29