Metropolitan Water Reclamation District of Greater Chicago
Calumet Compost Project

Preparing For a 27 Bunker Composting System

The Challenge

27 Bunker System with 6 Week Treatment Times


The Metropolitan Water Reclamation District of Greater Chicago (MWRD) needed a composting system that is capable of meeting EPA 503 Regulations during the harsh cold and windy winter weather conditions of the Great Lakes region.

Project Details
  • Ownership: Metropolitan Water Reclamation District of Greater Chicago (MWRD).
  • Location: South Side Chicago, IL
  • Design: In Process
  • Product: SG Bunker™ System with GORE® Covers
  • Input quantity: Biosolids (20% Solids) – 62,500 Wet TPY
  • No. of Heaps: 27 Bunkers, 27 covered, 164 ft. x 27 ft. x 12 ft. each
  • Treatment Time: 6 weeks in 2 Phases
  • Aeration: In-floor
  • Control Parameters: Oxygen Control Mode
  • Input material: Biosolids (20% Solids) / Wood chips and yard waste for bulking agent
  • Equipment: Pre-Treatment (Automatic Conveyor and Hopper System) / Front-end-loaders / Windrow Turning Machines
  • End Product: Class A EQ Finished Compost

The SG Solution

Standing Up To 4 Seasons of Rigorous Testing


Sustainable Generation provided two SG Mobile™ Systems with GORE® Covers for the testing in order to analyze two different mix recipes simultaneously.  During the initial test, in the dead of winter, the results proved that EPA 503 Regulations would be met using the technology.  Next the demonstration project focused on testing various mix recipes to gather data to optimize the system throughput.  After four seasons of testing, the SG technology using GORE® Covers was proven to perform and provide the necessary results in the Chicago climate.

MWRD engaged the Greeley and Hansen Engineering Firm in 2016 to perform a technology evaluation for a full-scale Covered Aerated Static Pile (CASP) composting project. The SG Bunker™ System using GORE® Covers was chosen for the full-scale project at the Calumet Water Reclamation Plant. The SG team has been working with Greeley Hansen and MWRD in the design and construction of the facility.

Results Delivered

Proven Capabilities in Preparation of Construction and Beyond


This project is in the design phase.  It is a 27 Bunker System with 6 weeks treatment time using the SG Bunker™ System with GORE® Covers for the active and maturation phases of composting followed by windrow turning using a turning machine to finish the production of Class A EQ Finished Compost.

Discover More Details Now

Download Full Project Profile