University of Wisconsin CASE STUDY

In-Vessel Composting

Operator: University of Wisconsin
Location: Green Bay, WI
Feedstock: Food Waste & Green Waste
Capacity: 208 T/year
Year Installed: 2020
Project Components:
  • Food scraps, wood chips
  • EF 20’x8’
  • Automatic Mixing & Aeration
  • Biofilter
  • Cold Climate Insulation Package

Client’s Requirements

The University of Green Bay aimed to enhance its campus sustainability efforts with the procurement of a fully enclosed, standalone commercial composting system. Their goal was to efficiently compost a minimum of 250 gallons of both pre and post-consumer food waste from their dining facilities each week, exclusive of the woodchip bulking agent. The selected technology needed to withstand Wisconsin's challenging climate, particularly the harsh winter months characterized by an average temperature of 20°F with sub-zero conditions. This initiative prompted the university to issue a bid request in March 2020.

Our Solution

In April 2020, GMT successfully secured the bid with our advanced 20’ Intermodal Earth Flow solution. This state-of-the-art in-vessel composter is capable of processing approximately 750 gallons of waste each week, efficiently converting it into compost within a 14-day timeframe, followed by an additional curing period of 1-2 months. The Earth Flow system is thoughtfully equipped with a range of engineering controls, which effectively deter pests and eliminate odors. These controls include automated mixing, bulking agents, positive aeration, and bio-filtration, all seamlessly integrated within GMT's renowned in-vessel system. Notably, this technology has proven its year-round resilience, functioning even in the most challenging winter conditions. It's a remarkable solution for on campus waste management that promotes environmental education & sustainability.