Prince George’s County Western Branch Composting Facility

Systematically Scaling from Mobile to Bunker

The Challenge

Putting the SG MobileTM To The Test

In 2013, Prince George’s County was in need of a composting solution that was capable of composting food waste as well as green waste.

Project Details
  • Ownership: Maryland Environmental Service
  • Location: Upper Marlboro, MD
  • Start-Up: 2013
  • Product: SG Mobile™ System with GORE® Covers
  • Input quantity: 12,000 TPY
  • No. of Heaps:8 Heaps, 6 covered, 82 ft. x 26 ft. x 12 ft. each
  • Treatment Time:8 weeks in 3 phases
  • Aeration:Above Ground
  • Control Parameters:Oxygen Control Mode
  • Input material:Source Separated Organics / Yard Waste
  • Equipment:Pre-Treatment (Grinders) / Front-end-loaders / Mobile Screen
  • End Product:High quality Finished Compost: Leaf Grow®

The SG Solution

Pilot Scale Demonstration Project

Prince George’s County implemented a SG Mobile™ System with GORE® Covers (covered aerated static pile) Pilot-Scale Demonstration Project in 2013 as a way to test the following:

Green Waste Composting
Food Waste Composting


Of significant importance to the Pilot-Scale Demonstration Project was that the 8-week SG Mobile™ System with GORE® Covers process outperformed the existing 8-month windrow turning process for quality, time to manufacture and performance.

In addition, the demonstration validated the PGC Western Branch’s ability to compost food waste at mix levels up to 50% resulting in a quality product manufactured within quality specifications with positive results for odor control. Finally, the demonstration project validated positive results for operational modeling and ability.

Results Delivered

A Solution That Scales At The Right Pace

Prior to the demonstration project, PGC Western Branch was composting only green waste, no food waste.

Year 2 – Post Pilot-Scale Demonstration Project – Prince George’s County continued to utilize the SG Mobile™ System with GORE® Covers for one year in a batch processing operating model to meet the demand of the food waste haulers who had come to rely on the PGC Western Branch as a necessary food waste recycling facility and destination point for their food waste materials.

Year 3 – PGC Western Branch expanded the operation adding one more SG Mobile™ unit and phase III heap so they could transition the operation to a continuous manufacturing model.

Year 4 – PGC Western Branch expanded the operation by adding 4 more SG Mobile™ units to meet the continuing demand for food waste disposal, making the operation a 12,000 TPY facility configured with SG Mobile™ units.

Currently – PGC Western Branch is developing a 12-windrow SG Bunker™ System with GORE® Covers facility with in-ground trenching for leachate capture and re-use, making it a 57,000 TPY compost facility.

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