Client:
City of Sanborn, IA

Sanborn, IA

Key Features:

  • New moving bed biofilm reactor (MBBR) wastewater treatment facility
  • Designed to treat up to 2.61 million gallons of water and 5,000 pounds of BOD/day
  • Pretreatment including two mechanical spiral screens and non-mechanical grit removal
  • New final clarifier and aerobic sludge digester
  • New outfall line
  • 400 kW backup generator & automated systems

Key Experience:

  • Maintaining the use of the existing facility and utilities while constructing the new system within a congested site
  • Coordinating treatment capacity, selection, and funding with a large industrial user
  • Working with the Iowa DNR, Iowa Finance Authority, and the EPA to properly abide by the requirements of the SRF funding

Wastewater Treatment Facility

DGR worked jointly with the City of Sanborn, Iowa and a large industrial user to evaluate multiple treatment alternatives. Ultimately, the selection of the MBBR was chosen based on cost, operational flexibility and most importantly, limited land availability. Due to the large fluctuations in the industrial loading, a fixed film treatment technology was selected in lieu of activated sludge. Construction of the project started in the beginning of 2019 and was completed in Spring 2020.

Click here to see the facility in action.

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Sanitary Sewer Rehabilitation

The project was bid and came in under budget. Manhole lids were raised to provide better access in some areas, and rehabilitation of the sewer system was completed to give another 50 years of life to the City’s much-needed infrastructure.

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Wastewater Treatment Facility

MBBR technology was chosen based on cost, operational flexibility and most importantly, limited land availability.

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Floodplain Analysis

DGR employed a Geographic Information System (GIS) in conjunction with the U.S. Army Corps of Engineers to first determine the 100-year flood elevations and delineate the floodway boundaries.

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Distribution Conversion

Due to concerns with the age and condition of the structures, along with safety clearances to energized equipment and conductors, a project was undertaken to replace the old infrastructure with new underground lines and associated padmount equipment.

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Street & Utility Improvements

Morningside Avenue was reconstructed totaling approximately 1,300 linear feet. The project included new sanitary sewer, water main, storm sewer, fiber conduits, decorative street lighting, and 9-inch concrete paving with colored concrete sidewalks.

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