Site work for a water / sewer project in Madison, Wisconsin. Completed plans call for site work for a water / sewer project.

As part of the District's mission of resource recovery, Nine Springs Wastewater Treatment Plant (NSWWTP) utilizes a phosphorus recovery process to produce a commercial struvite product for beneficial reuse as a fertilizer. Removal of phosphorus from the waste stream allows the District to produce a beneficial product for reuse and reduces the labor and cost involved with removing nuisance formations of struvite in the solids handling processes. The struvite harvesting process takes place in the Struvite Harvesting Building dedicated to this use at NSWWTP. The Struvite Harvesting Building was constructed in 2013 as part of the 11th Addition Project, which was primarily focused on solids handling at NSWWTP. The struvite harvesting process is fed digested sludge filtrate and waste activated sludge filtrate from a series of gravity belt thickeners. The filtrate is fed through two parallel process trains. The filtrate is screened and fed into the reactors. Magnesium chloride is added to provide additional magnesium to maximize struvite production, and sodium hydroxide is added to maintain pH to optimize precipitation of the struvite. Precipitated struvite produced in the reactors is then fed to the vibrating dryers where it is heated with the plant hot water loop. The exhaust passes through a cyclone system to remove fine particles before being discharged out the side of the building. During the time the struvite harvesting process has been in operation, some issues have been observed with these first-generation drying and seeding processes which will be addressed under this project to improve reliability, safety, and production capacity. Firms are invited to tour the wastewater treatment plant with District staff and view the key system components included in the study. Attendance is NOT mandatory, and the consultants can choose whichever date/time is most convenient for them. Consultant team members must provide their own PPE. The tours will begin and end outside of the Operations Building at the Nine Springs WWTP, located at 1610 Moorland Rd, Madison, WI 53713. No verbal statement made by a MMSD employee or anyone else is binding, nor shall such a statement be considered an official part of this public proposal. MMSD is federal and state tax exempt and reserves the right to reject any or all proposals or to waive any technicality and accept any proposal which may, in its opinion, be advantageous to MMSD.