Wastewater Treatment Plant Expansion

Capacity increase means being prepared for Owatonna’s future growth

Construction of the Wastewater Treatment Facility Upgrade and Expansion has been progressing since July. The foundations for the MBR (Membrane Bioreactor) and Fine Screen Buildings have been completed. The walls for the MBR building are starting to take shape with a significant amount of rebar work happening week after week and concrete pours continuing as rebar is completed for the cast-in-place part of the structure. Excavation for the Solids Thickening Building has started and will continue over the next few weeks. 

Things will really start to look different on the southwest side of the site come the first week of December when the precast walls for the Fine Screen Building are scheduled to be installed. This building is the tallest of the new structures with 42-foot walls. The delivery and installation of the three new fine drum screens within the building are also scheduled for the first part of December. 

The project is expected to be completed in late 2024. An expansion of Owatonna’s existing wastewater treatment plant was initiated in 2017. The plant has been operating at or above its capacity for the past several years. In 2021, plans got underway to expand the plant from its current capacity of five million gallons per day (MGD) to more than nine MGD, an 80 percent increase to continue meeting the needs of the growing community. 

Below is a short video Nero Engineering put together showing construction progress through October 4th from a bird’s eye view!