At the newly expanded 30 MGD (million gallons daily) Wastewater Treatment Facility in American Fork, Utah, Landia has completed a successful pump and mixer retrofit that has transformed eight existing oxidation ditches into new high-rate activated sludge bioreactors with biological nutrient removal, solids dewatering, and UV disinfection.
A total of 48 Landia submersible mixers and 16 Landia axial flow pumps are achieving complete mixing and nitrate recycling in a new activated sludge process at the site run by the Timpanogos Special Service District, close to Utah Lake, which serves 10 cities in the region.
Working in close conjunction with leading Utah and Idaho engineering firm Bowen Collins & Associates, Inc to select long-lasting equipment that would give optimum performance, mixers from Landia now mix the sludge in the anaerobic and anoxic tanks, whilst internal Landia Recycle Pumps send nitrified mixed liquor from the aeration basin onto the anoxic tanks.
Operating at low propeller speed, each Landia mixer is equipped with large surface area propeller blades to ensure gentle treatment of the activated sludge.
The axial flow pumps operate on Variable Frequency Drives, by which each pump’s flow rate is optimized for the required Nitrate recycle rate.
Ed Yates, Maintenance Coordinator for Timpanogos Special Service District, commented: “The move to bioreactors has been a learning experience for us, with a great deal of hard work put in to achieve the required mixing and recirculation. Landia’s pumps and mixers are performing well and the support we’ve been given by the company to help get the equipment up and running to our satisfaction has been exemplary”.
The ($77M) project, which also features a new headworks and influent pump station, has increased the capacity of the treatment plant from 18.3 mgd to 30 mgd.
Over the past 25 years, Landia has installed thousands of mixers and axial flow pumps in U.S. wastewater treatment plants for mixing and pumping of activated sludge.
Serving the water, wastewater, general, electrical and environmental industries, Bowen Collins & Associates’, numerous successful projects include the a Sewer Master Plan and Asset Management Assessment for Salt Lake City’s sewer system, which consists of approximately 640 miles of pipe, 8,500 manholes, and 33 lift stations.