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GreenWhey Energy Food Waste-to-Energy Project

Turtle Lake, WI


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Owner: GreenWhey Energy, Inc.
Completion: November 2013

Additional Resources:

Project Description:

The GreenWhey Energy project is a greenfield development that recycles food waste from the dairy industry and generates electricity. Miron has been integrally involved in the development of this project from active participation in the conceptual design, initial estimating, permitting, and assembly to the leading of the detailed design, value engineering, and constructability reviews. Miron also provided rigorous involvement and support of project financing, balance of plant equipment procurement, construction, and start-up/commissioning.

Miron’s scope of work included the following:

  • Complete balance of plant design engineering and process integration.
  • Construction of an integrated masonry and reinforced concrete complex that includes office areas, a maintenance shop, control room/laboratory, two electrical rooms, raw waste unloading bays, a chemical room, biogas conditioning room, engine room, utility room, two electrical rooms, a blower room, and a filter press room.
  • Lined reinforced concrete equalization tanks.
  • Lined reinforced concrete preconditioning tank.
  • Reinforced concrete anaerobic reactors with floating membrane covers.
  • Process integration and installation of all equipment furnished by process technology providers direct to GreenWhey Energy.
  • All above- and below-grade mechanical piping and HVAC, electrical, controls, and instrumentation.
  • Coordination of all required utility interconnections.

High strength wastewater from area dairies is piped and trucked to the site and unloaded into one of several lined reinforced concrete equalization tanks. The contents of these tanks is pumped to a lined reinforced concrete preconditioning tank where the feedstock is blended and fed into two 2 MG reinforced concrete anaerobic digesters that consume and break down the organic material and produce methane. The methane is then supplied to two CAT 3520 biogas engine generators that generate 3.2 MW of electricity that is sold to Xcel Energy for distribution on their grid. Hot water from the biogas engine generator heat recovery systems is captured and utilized for building heat, preheating of the feedstock in the preconditioning tank, and maintenance of the temperature of the anaerobic digesters.