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Table 3.1: <br />Leachate Flow <br />(gpm) <br />Leachate Percentage <br />Average Plant <br />Flow (MGD) <br />of Total Flow <br />Percent of Total Average <br />Plant Flow UVT <br />6.7 <br />1.34 <br />0.72% 65.5% <br />13 <br />1.34 <br />1.40% 64.0% <br />18 <br />1.34 <br />1.93% 56.5% <br />21 <br />1.34 <br />2.26% 49.4% <br />25 <br />1.34 <br />2.69% 47.8% <br />1.8 <br />1.6 <br />1.4 <br />(D 1.2 <br />7 1 <br />3 <br />0 <br />E: 0.8 <br />0.4 <br />0.2 <br />0 <br />9/22 <br />Elk River WWTF Flow <br />10/2 10/12 10/22 11/1 11/11 11/21 <br />Figure 3.3: Elk River WWTF Flow <br />D. Bench -Scale Chlorination Test Results <br />As noted earlier, chlorine is a strong disinfectant and has a strong oxidation potential. <br />The goal of the chlorination study was to determine what dose of chlorine would be <br />optimal for increasing the UV transmittance. The lowest recorded UV transmittance <br />occurred after 837 hours of run time with a value of 44.5%. The leachate flow rate at <br />the time was 25 gpm. Samples of the effluent wastewater were collected and stored to <br />test the dose of chlorine required to increase the UV transmittance. The bench -scale <br />chlorination testing results are shown in Table 3.2. <br />Prepared by: Bolton & Menk, Inc. Results and Discussion <br />Waste Management/Elk River Leachate Pilot Study I T21.109643 Page 13 <br />