Sewer and Waste Water Treatment
The City of Aurora’s Sewer Department and Wastewater Treatment Facility has responsibility for wastewater collection, lift stations and the operation of the wastewater treatment plant.
Aurora's Wastewater Treatment Plant was built between 1995 and 1996. The WWTP has a Hycor spiral screen for debris removal, a one million gallon oxidation ditch and two fifty foot clarifiers witch each hold 225,000 gallons.
The Plant has four 360,000 gallon aerobic digesters and we dewater using a 2.1 meter Ashbrook belt press. The bio solids are stored on site in the field until they are land applied each spring. We also have a 14 acre facultative lagoon that we use in times of trouble.
The City of Aurora Wastewater Treatment Plant is a State of Nebraska Class II facility. Currently, the plant has a staff of two operators. In-house daily and weekly testing for pH, T.S.S., B.O.D., conductivity, ammonia and nitrate is performed by the staff.
The plant has averaged 750,000 gallons per day since start up in 1996 with an ethanol producer and pet food manufacturer as the City’s main industrial wastewater customers. The City has a population of approximately 4,500 people. Our discharge permit requires us to discharge less than 30 mg/L of B.O.D. 30 mg/L of T.S.S.
Some of our other discharge permit limits are winter ammonia of 5.57 mg/L, spring ammonia of 4.86 mg/L and summer ammonia rates of 2.70 mg/L. The WWTP also has a maximum kilograms per day limit on the above mentioned discharges. The City of Aurora WWTP discharges its wastewater into the Lincoln Creek.
Recently, the City of Aurora awarded a $2.852 million Plant Expansion Project to Rutjens Construction of Tilden, Nebraska. The expansion projects will double the existing treatment capacity of the plant. Specifically, the project will add another 1 million gallon oxidation ditch with one 60 foot diameter clarifier, electrical and controls system. There will also be upgrades made to the existing ditch and to the main lift station. The WWTP Expansion Project is scheduled to be completed in early summer of 2012.