GMT Composting Systems provides in-vessel composting systems for on-site food waste recycling. Founded in 1992, GMT has developed several systems for small, mid-sized, and large waste generators. Their flagship systems include the Earth Tub for small sites, Earth Flow for mid-sized sites, and CompTainer for large volumes. These systems use aerated vessels and mixing to efficiently compost food waste into soil amendment within 2-3 weeks while controlling odor, vectors and other issues.

1. GMT Composting Systems
Green Mountain Technologies

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GMT Composting History
Founded in 1992 in VT
Began developing small
on-site systems in 1996
Installed first large ASP
system in 1998 in WA
Moved to Seattle in 2001
Developed Earth Flow
System in 2004

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4. Green Mountain TechnologiesGreen Mountain Technologies
Overview of Composting Process
Food Scraps
(Water)
Bulking
Material
Vessel Curing
Air
Process Control:
• recipe
• temp control
• moisture addition
• 14-21 days
Soil
Amendment

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Why On-Island Composting?
Large portion of waste stream
Closed loop recycling!
Produces compost which is valuable for
sandy soils on the Vineyard!
Reduce ferry costs and impacts
Educational opportunities

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Why In-Vessel Composting?
Control of vectors (insects and rats)
Control of odors
Aesthetics
Convenience
Space constraints
High throughput over a small footprint
Speed of composting

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GMT In-Vessel Systems
The CompTainer™
for large on-site waste generators
The Earth Tub ™
for smaller on-site waste generators
The Earth Flow ™
for mid-sized waste generators

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Auger mixes food on
surface into hot compost
The food cooks and
softens in the compost
Mixing blends the cooked
food onto the bulk
material
How the Earth Tub Works

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Earth Tub Concept
Batch concept
One or two tubs
Capacity 150 lbs/
day

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The Development of the Earth Flow
Larger capacity
Higher productivity
Continuous flow
Automation

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Composting in the Earth Flow

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Greenhouse Enclosure
Provides heat gain in
summer/winter
Contains odors and
keeps out weather
Prevents access to
machinery.

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Excellent Odor Control
1. Bulking Material
2. Auger-Driven System
3. In-Vessel Technology
4. Greenhouse Enclosure
5. Biofiltration of Process Air
Have installation inside a
basement in a highrise in
NYC!

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The Containerized Compost System ™
BFI Food Composting Facility San Jose, CA

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Mixing of Recipe
4 Auger Design
Provides Complete
Mixing
10 Minute Cycle Time
Integrated Scales
Stationary or Mobile
Design

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The CompLoader Conveyor
Makes mixing and loading a
single step process

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The CompTainer Vessel
All-weather composting
Patented aeration design
Perforated stainless floor
Insulated construction
Gasketed doorways
Roll-off truck transportable
Sealed Container for Composting

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75 TPD
52 CompTainers
Installed in 2002
Odor Control thru
biofiltration
Foodwaste Composting on PEIFoodwaste Composting on PEI

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CompDACS™™ Data Logging
Records Temperatures
for each CompTainer
Averages
Temperatures
Provides graphs and
Excel output
Full EPA 503
Compliant Record
Keeping

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Produces fine product
Recovers bulking agent
Removes contaminants
Reduces volume of compost
CompLoader IntegratedCompLoader Integrated
with Trommel Screenwith Trommel Screen
Compost ScreeningCompost Screening

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ASP and AEP Composting

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(above ground piping system)
ASP Installations in Oregon
35,000 tons per year on 6 acres

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Covered ASP Systems
60,0000 Ton Per Year Facilty

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Positive w/Biofilter layer Negative with Biofilter
ASP In-Slab Aeration

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AEP System Inside Building
The Compost Factory
Tacoma, WA

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What are the challenges with Food
Waste Composting?
Collection
Plastics contamination
Frequency of Collection
Liquids
Comingling with
yardwaste
Biodegradable plastics
Composting
Low pH
Higher Odor Potential
Variable Composition
Vectors
Salts

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Thanks for Your Interest in
Food Waste Composting!
Willows Lodge, Woodinville, WA