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30 <br />25 <br />J <br />E 20 <br />N <br />7 <br />15 <br />ry <br />c <br />10 <br />W <br />5 <br />N <br />Effluent BOD <br />+Effluent Phosphorus <br />+Effluent TSS <br />Fecal Coliform (MPN/100 mL) <br />--O--Leachate Flow Rate (gpm) <br />-N' <br />11 OGS �°� �°� �0 �0 <br />` ' NII N tis" V a' N'h <br />Figure 3.1: WWTF Effluent Results <br />B. Effects on the Disinfection System <br />C <br />25 <br />E <br />Q <br />20 <br />N <br />ry <br />15 0 <br />aD <br />10 co <br />U <br />N <br />U <br />J <br />6� <br />L <br />The City of Elk River uses an Ultraviolet (UV) disinfection system at the WWTF. <br />UV disinfection has several advantages such as improved disinfection, no need to use <br />chlorine or other chemicals, and the system is easy to maintain. However, there are <br />some disadvantages to UV disinfection. One of the primary disadvantages is that <br />when particles or other substances are present in the wastewater, the UV light will <br />reflect off the particles reducing the effectiveness of UV disinfection. Organisms can <br />be attached to or behind these particles and the UV light will not reach them, thus <br />ineffectively inactivating them. The color and fine particles in leachate can adversely <br />affect the performance of UV disinfection systems. <br />Even though the biological processes performed very well in removing CBOD, <br />ammonia, and phosphorous, however, the biological process was not able to remove <br />color introduced in wastewater by the leachate. One practical tool for measuring the <br />effectiveness of the UV disinfection system is to measure the UV transmittance. <br />Prepared by: Bolton & Menk, Inc. Results and Discussion <br />Waste Management/Elk River Leachate Pilot Study I T21.109643 Page 9 <br />