_O & M MANUAL - WEST LANE MOBILE HOME PARK

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As the incoming water flow rate increases, the water level in the unit rises, immersing a greater number of SANURIL tablets. When the incoming flow rate decreas- es, the water level in the unit drops, exposing fewer ( 'its to the water. Since the amount of SANURIL dis- ed depends upon the number of tablets immersed in __ water, the initial chlorine concentration remains con- stant, regardless of the water level in the feeder. From the feeder, the chlorinated wastewater flows into the chlorine tank where it is held for a sufficient time to permit effective bacteria killing action. Although each model 1000 or 1001 is furnished complete with four feed tubes and a selection of weirs, the actual number of tubes to be filled with SANURIL tablets and the weir to be used are determined by the average daily flow rate through the plant and required residual chlorine content. Sizing a SANURIL Installation Before the Model 1000 or Model 1001 is put into opera- tion, the system must be sized and "set' to provide the required dosage of SANURIL. This is accomplished by determining the amount of SANURIL required to deliver the desired levels of chlorine, selecting the appropriate number of feed tubes to use and selecting the proper size opening. Initial sizing of the Model 1000 or del 1001 is simple and easy; just follow the steps out- mied below: Determine the Plant Flow Rate - The average daily plant flow rate can be determined in a number of ways. It may be obtained from lift station pump starts, flow rate meters, integra- tor flow counters or other devices which indicate the amount of sewage flowing through the plant in a 24-hour period. As a reminder, the Model 1000 or the Model 1001 Tablet Feeder is designed to handle up to 50,000 gpd. Higher flow rates can be handled with multiple units installed in parallel. If multiple feed- ers are required and the flow split is not equal through each feeder, the sizing should be done separately on each feeder using the appropriate flow rate. If the flow is split equally, siz- ing should be done on one (1) feeder and the final results should be multiplied by the number of feeders being used. 2. Determine the Chlorine Dosage Required - The required level of chlorination is determined by the total amount of chlo- rine to satisfy the chlorine demand of the system added to the amount of residual chlorine desired after a predetermined con- tact or detention time. If the chlorine demand is not readily known, an estimation can be made by using the general guidelines for chlorination requirements as published by the EPA. An abbreviated summary of these guidelines can be found in Figure 7. For example, if you have an extended aeration treatment plant (activated sludge) and do not know what the chlorine demand is, refer to Figure 7. The typical dosage for activated sludge is 3. between 2 to 8 mgll chlorine. For sizing purposes, take a value somewhere near the mid -point of this range (5 mg/1). Once the system has been sized and set, allow the system to operate for one (1) hour to 1 112 hours before sampling the effluent. If the levels are not exactly what is desired, adjust the unit as described in the Trouble Shooting Section. CHLORINATION TREATMENT FOR: TYPICAL DOSAGE: PPM SEWAGE FRESH RAW 6-12 SEPTIC RAW 12-25 TRICKLING FILTER 3-10 ACTIVATED SLUDGE 2 - 8 SAND FILTER 1 - 5 SLIME 1 -10 DISINFECTION 25-50 SULFUR BACTERIA 1-10 SWIMMING POOL 1 - 10 TASTE 1 - 10 WATER COOLING 1 -10 CHILLING 5-25 WASHDOWN 25-50 WELL 1 - 5 SURFACE 1 - 10 Figure 7 - General Guidelines Chlorine Dosage Requirements Determine the Amount of SANURIL Required To Provide The Desired Chlorine Residual - The quantity of SANURIL necessary to meet the desired chlorine dosage established in Step 2 can be determined by following the calculations provid- ed in the SANURIL SIZING WORKSHEET shown in Figure 8 (Equations 1-3). You are encouraged to use this worksheet by filling in all the necessary information to size your installation. If additional worksheets are needed, please contact the Customer Service Department. Enter the amount of chlorine required in 1 (a) and multiply by 0.0000083 to give the desired amount in lbs. of Clz/ gal. The 0.0000083 factor includes all the conversions to change the units from mg/I to lbs/day. In Equation 2, the value from 1 (b) is then divided by 70% to convert the value from lbs. CIdgal to lbs. SANURILIgal. The SANURIL tablets contain a minimum of 70% available chlorine. In Equation 3, multiply the value from 2 (c) by the flow rate of the plant (3d). This will give you the lbs. SANURIL/day (3e) required to deliver the amount of chlo- rine desired. EXAMPLE: A system with a flow rate of 10,000 gpd needs to deliver 5 mg/I of chlorine; 5 mg/I (1a) X 0.0000083 = 0.0000415 lbs. C12/gal. (1b); 0.0000415 divided by 0.70 (70%) = 0.0000593 lbs. SANURIL/gal. (2c) ; 0.0000593 X 10,000 gpd (3d) = 0.59 lbs SANURIL/day (3e).