Wastewater Treatment Facility Expansion Project Update
Major Milestone Reached
The completion of the membrane bioreactor (MBR) marks a major milestone in the Owatonna Wastewater Treatment Facility (WWTF) Expansion Project. The MBR is the final step of the biological treatment process where liquids and solids are physically separated to allow only a high level of water quality to be discharged. All wastewater flow coming into the facility is now treated through the membrane bioreactor (MBR) process before discharging to the Straight River.
The startup of this process included over a month of equipment testing and fine-tuning, this testing resulted in the system working immediately upon operation. There were a few issues to work through once everything was operating together, which is expected with the amount of equipment involved. However, the system’s capacity allowed the team to work through these bugs while effectively treating the wastewater to an exceptional level. The coordinated effort among the plant operations team, contractor, equipment supplier, and engineer has contributed to the successful implementation of the MBR process.
Other recent work at the WWTF has included the construction of the anaerobic digester covers which are being built and painted next to the existing digesters and then will be lifted into place on the tanks. Progress has been made in the Solids Thickening Building and other areas throughout the plant including process piping, electrical and mechanical systems installation. The remodeling effort in the Administration Building is well underway and will result in updated office spaces, larger conference and meeting rooms, a new kitchen, upgraded showers and locker rooms and a plant control center.
The WWTF Expansion Project has been steadily progressing since July 2022. The initial anticipated completion date has been pushed to 2025 largely due to supply chain issues, specifically with necessary electrical components. Visit owatonna.gov for more information.