Client:
City of Estherville, Iowa

Estherville, IA

Key Features:

  • New dual membrane digester covers on primary and secondary digesters w/ high velocity mixing system.
  • Digester gas production and capture increase with equipment upgrade.
  • Prioritizing plant improvements to existing equipment and infrastructure.

Key Experience:

  • Evaluation of treatment plant and analyzing available technologies to determine the best solution for the client.
  • Determining necessary plant improvements not directly related to NPDES permit compliance.

Digester Improvements Project

Analyzed digester cover and mixing system alternatives due to condition of existing plant equipment. Selected cover and mixing system to best fit the City’s request for potential future digester gas re-use to reduce plant operational expenses. Dual membrane cover with high velocity nozzle mixing was selected based on life cycle analysis of alternatives.

Performed a plant evaluation of the existing equipment and infrastructure to prioritize improvements to the facility that will not affect potential future improvements to the facility to meeting compliance with the newly issued NPDES permit.

Featured Projects

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  • Electrical Power
  • Survey
  • Wastewater
  • Water

Site Development

DGR Engineering (DGR) worked with the City and the project architect for all aspects of the project including topographic survey, site design, construction survey, construction observation and administration.

Site Development
Sioux City, Iowa

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.

Sanitary Sewer Rehabilitation
Rembrandt, IA

Wastewater Treatment Facility

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

Wastewater Treatment Facility
Sanborn, IA

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.

Floodplain Analysis
Sutherland, IA

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.

Distribution Conversion
Redwood Falls, MN

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.

Street & Utility Improvements
Sioux City, IA