Alta Wastewater Treatment Plant

Alta, IA | Water

Overview

After an evaluation, ISG designed a new activated sludge treatment system that is more energy-efficient and has a smaller footprint.


Opportunity

Originally constructed in the 1950's, the City of Alta's wastewater treatment plant could not meet recently updated water quality standards.

Solution

The City of Alta wastewater treatment plant utilized a trickling filter treatment system that was constructed in the 1950's and upgraded several times. Recent changes to the water quality standards required lower ammonia nitrogen and bacteria discharge limits that the treatment efficiency of the existing system could not meet.

Following an in-depth evaluation, ISG recommended that the City abandon the trickling filter plant and construct a new Aero-Mod, Inc. SEQUOX activated sludge system. This activated sludge treatment system is an innovative system that incorporates aeration tanks, clarifier tanks, and digester tanks into one unitized design. This system results in a more energy-efficient operation and a smaller footprint compared to other activated sludge designs, thereby lowering capital costs.

The new treatment system showed significant improvements over the existing system, yielding significant reductions of CBOD5, TSS, and ammonia compared to the former facility.


Market News

Toe Wildlife Management Area Receives 62-Acres of Wetland Restoration

December 22, 2020 (Mankato, Minnesota) – After nearly four years of planning, design, and construction, ISG is proud to report the successful completion of a 62-acre wetland restoration project within the Toe Wildlife Management Area (WMA). Situated in rural Jackson County, an area of southern Minnesota where less than 1% of original wetlands remain, the project is part of a larger initiative of the Heron Lake Watershed District to protect and restore nearly 350-acres of wetlands in the Toe WMA.
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Mankato MoonDogs’ Franklin Rogers Park to be Renamed ISG Field

October 20, 2020 (Mankato, Minnesota) – Building on a series of successful partnerships and projects to bolster its ballpark, the Mankato MoonDogs, a member of the Northwoods League, has exercised its rights with the landlord, the City of Mankato, to lease the naming rights of Franklin Rogers Park to ISG. The ballpark will be named ISG Field after the professional design and engineering firm that was founded in Mankato in 1973. ISG Field represents the MoonDogs’ commitment to providing top quality local baseball and an enriching fan experience. This is the latest update for the team, which has unveiled a new logo and has implemented several renovations for the ballpark in recent years.
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