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Prince George’s County, Maryland, USA – Put the SG MOBILE® System to the test, then expanded to an SG BUNKER® System

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 / Full Scale Expansion 2018
Product: SG MOBILE® System & SG BUNKER® System
Input quantity: 12,000 TPY / 57,000 TPY
No. of Heaps: 8 Heaps, 6 covered, 82 ft. x 26 ft. x 12 ft. each + 12 Bunkers
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: LeafGro Gold®


THE SG SOLUTION

Pilot Scale Demonstration Project

Prince George’s County implemented an 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 process outperformed the existing 8-month windrow turning process for quality, time to manufacture, and performance.

In addition, the demonstration validated Prince George’s County’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.


PROJECT GALLERY

SG MOBILE® System & SG BUNKER® System at Prince George’s County Compost Facility

 


RESULTS DELIVERED

A Solution That Scales At The Right Pace

Before the demonstration project, Prince George’s County was composting only green waste, not 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 facility as a necessary food waste recycling facility and destination point for their food waste materials.
Year 3 – Prince George’s County 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 – Prince George’s County expanded the operation by adding four 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.
Today, full scale, with the addition of the 12 SG BUNKER® Systems with GORE® Covers, the facility, with in-ground trenching for leachate capture and re-use to help protect the Chesapeake Bay ecosystem, is a 57,000 TPY full-scale organics composting facility.

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