Waste Water Treatment
The City of Aurora’s 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. In 2012 The City of Aurora did a $2.852 million Plant Expansion Project, which doubled the size of the plant. The WWTP has a Hycor spiral screen for debris removal, 2 one-million-gallon oxidation ditches which hold 1-millon gallons each, two fifty-foot clarifiers that hold 220,000 gallons each and a 60-foot clarifier that holds 318,000 gallons.
The Plant has four 360,000-gallon aerobic digesters and we dewater using a 2.1-meter Ashbrook belt press. The Plant produces 700 tons of biosolids each year that are stored on site until they are land applied each spring and fall. 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 averages 900,000 gallons per day 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 NPDES permit requires us to discharge less than 25 mg/L of B.O.D. 30 mg/L of T.S.S.
Some of our other discharge permit limits are winter ammonia of 2.95 mg/L, spring ammonia of 1.55 mg/L and summer ammonia rates of .86 mg/L. The WWTP also has a maximum kilogram per day limit on the above-mentioned discharges. The City of Aurora WWTP discharges its wastewater into the Lincoln Creek.
In 2017 the City added a 480kW solar field at the Wastewater Treatment Plant. This project was done by GenPro Energy Solutions and was designed to offset 84% of the Plant’s electricity cost.