|
|
|
|
|
|
||
|
|
|
|
|
|
||
|
|
||
|
|
||
|
|
||
|
|
||
|
|
||
|
|
||
|
|
||
|
|
||
|
|
||
 Click to Enlarge |
The Yorkville-Bristol Sanitary District has one wastewater treatment facility that is designed to treat three million, six hundred thousand (3,600,000) gallons of wastewater per day, or serve a population of thirty six thousand (36,000) people. The boundaries of the Sanitary District encompass an area of 6.6 square miles, and the population equivalent (PE) is about 18,000.
The District is an independent municipal corporation under the provisions of the Illinois Sanitary District Act of 1917. The formation of the District was authorized by referendum at the elections of December 27, 1954, and confirmed by order of the County Court of Kendall on January 5, 1955.
The wastewater treatment facility is managed and operated by six full time employees. The treatment facility is an activated sludge process, without the use of primary sedimentation. The wastewater enters the plant via 8.0 miles of intercepter (large trunk lines) sewers, ranging from 12 inches to 48 inches in diameter. After the grit, plastics, and rag materials have been removed, the wastewater is pumped directly into the aeration tanks where aerobic bacteria absorb and adsorb the solids and break them down to a stable odorless product.
The bacteria then form a floc that is sent to the settling basins (final clarifiers) where they settle out under quiescent conditions, and a clear supernate (clear water) is carried out over a weir (trough). The clear water then goes to a ultra violate (UV) contact tank for disinfection, and aeration, then directly to the Fox river. The excess solids that are produced by bacteria multiplication (binary fission) is wasted (pumped) to an autothermic thermophilic aerobic digester (ATAD). The ATAD process produces a high heat, and stabilizes the sludge to meet a Class “A” biosolids. After the digestion process is complete, the excess solids are taken to a landfill for disposal.