Biosolids Replacement Project


The biosolids processing equipment is being replaced at the City of Northfield’s Wastewater Treatment Plant. The equipment takes a liquid sludge and processes it to a dirt like substance that can be used as fertilizer on agricultural fields. The project will include installation and replacement of all of the biosolids processing equipment along with integrating it into the City’s control system.

On May 29, 2018, the City’s biosolids processing building experienced a fire. The equipment inside the building was a total loss. Currently, the City is operating temporary equipment for processing its biosolids.

Project history

May 29, 2018: fire in biosolids processing building at the City’s wastewater treatment plant.

June 5, 2018: Council approves resolution declaring a local emergency.

July 3, 2018: City procures temporary biosolids processing equipment.

January 8, 2019: Council approves plans and specifications and authorizes advertisement for bid for the Wastewater Treatment Plant biosolids processing equipment.

Presentation to City Council on Biosolids Improvement Project (January 8, 2019)

February 19, 2019: Council approves resolution accepting bids and awards project for the Wastewater Treatment Plant biosolids processing equipment to Shank Constructors, Inc.

Construction timeline

July-August 2019: equipment arrives onsite

August-October 2019: install equipment

November-December 2019: substantial completion

February 2020: final completion


Final construction plans