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Table 3.2 Continued <br /> Evaluation of Existing Treatment Units Summary <br /> Elk River Wastewater Treatment Facilit <br /> Filters <br /> Number 6 <br /> Size, ft x ft 12 x 20 <br /> Area, ft' 240 <br /> Media Silica Sand <br /> Media Depth,inches 10 <br /> Total Max Capacity 7.0 MGD 5.68 MGD 7.27 MGD <br /> UV Disinfection <br /> No. of Channels 1 Capacity can double with <br /> installation of UV <br /> Max PHWW Capacity 3.0 MGD 5.67 MGD 7.26 MGD equipment in the existing <br /> spare channel <br /> Primary Digester <br /> Diameter, ft 55 <br /> Depth, ft 20 <br /> Volume,gallons 355,000 <br /> Capacity,lbs dry solids/day 4,470 13,400 17,150 <br /> Secondary Digester <br /> Diameter, ft 35 <br /> Depth, ft 19.5 <br /> Volume,gallons 140,000 <br /> Biosolids Storage <br /> Number 1 (with two <br /> basins) <br /> Volume,gallons 700,000 <br /> Volume, ft' 93,583 <br /> Dry Solids Production,lbs/day 2,377 13,400 17,150 <br /> Dry Solids Production After Anaerobic <br /> Digestion,lbs/day 1,379 5,363 6,863 <br /> Number of Days of Storage for Digested <br /> Sludge,at <br /> 2% Solids 84.7 17.8 13.9 <br /> 3% Solids 127.0 26.7 20.8 Storage capacity should <br /> 4% Solids 169.4 35.5 27.8 be a minimum of 180 <br /> 5% Solids 211.7 44.4 34.7 days. <br /> 6% Solids 254.1 53.3 41.7 <br /> City of Elk River—T12.104758 Page 15 <br /> Wastewater Treatment Facility Plan Prepared by Bolton&Menk,Inc. <br />