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Page 3 <br />Permit MN0020788 <br />Facility Description <br />The Elk River Wastewater Treatment Facility (Facility) is located in the NF %, Section 3, Township 32 <br />North, Range 25 West, city of Elk River, Sherburne County, Minnesota. This is a Class A facility. <br />Major components of the Facility include: <br />Collection with gravity and/or Pressure Sewer <br />2 Bar Screens - mechanical <br />Influent Flow Meter <br />1 Grit Removal <br />2 Primary Clarifiers <br />2 Trickling Filters <br />1 Activated Sludge - contact stabilization, conventional, step feed <br />Phosphorus Removal —chemical <br />Sodium Hypochlorite chemical feed system <br />3 Secondary Clarifiers <br />Filter --six-cell sand filter with backwash <br />Ultraviolet Light <br />2 Anaerobic Digesters - complete mixed, heated - mesophilic <br />2 Storage Tanks <br />Land Application <br />The existing Class A wastewater treatment facility consists of two mechanically cleaned bar screens, <br />screenings wash press, influent ParshaII flume, vortex -type grit removal system, two primary clarifiers, <br />two trickling filters (currently run in series mode), aeration basin (no diffusers or blowers were <br />provided/installed), chemical feed system for phosphorus removal, sodium hypochlorite chemical feed <br />system, three secondary clarifiers, pump station, six -cell dual media sand filter with backwash, and <br />ultraviolet (UV) disinfection. Biosolids treatment consists of anaerobic sludge digestion using one <br />primary and one secondary anaerobic sludge digester. Biosolids are stored in two sludge storage tanks <br />and eventually land applied. <br />The proposed facility will continue to use the existing pretreatment facility. The proposed facility will <br />expand the existing design flow from 2.2 million gallons per day (mgd) to 4.54. mgd. The existing <br />primary clarifiers will be rep urposed as anaerobic tanks for blologicaI phosphorous removal. The existing <br />trickling filters will be removed and a new extended aeration activated sludge basin that can be <br />operated in series or parallel will be added. The existing final clarifiers will remain, however, new covers <br />will be added. The existing final clarifier sludge wet well will be removed and a new Return Activated <br />Sludge/Waste Activated Sludge lift station and building will be installed. The existing sand filters will <br />remain but new chlorine and dechlorination equipment will be added. The existing UV disinfection <br />process will remain as will the existing chemical feed system for phosphorous removal. A new biosolids <br />and blower building will be constructed and the existing control building and garage will be removed to <br />make room for the required improvements and a new operations building and garage will be <br />constructed. Biosolids treatment will consist of converting the existing anaerobic digesters to aerobic <br />digesters and the existing biosolids storage tanks will also be converted to aerobic digesters and storage. <br />The liquid biosolids will be run thorugh a screw press to produce a cake product. The blosolids will be <br />disposed of as a cake product to either a landfill or to the Facility"s existing permitted land application <br />sites. <br />