Michael Stivala Suburban Propane CEO

Michael Stivala | President & CEO

Suburban Propane

John Rulfs ADK Farms

Jon Rulfs | CEO

ADK Farms

Suburban Propane logo red

“Through our Suburban Renewables platform, we continue to grow our portfolio of renewable energy options in support of an economy-wide transition to a sustainable energy future. To effectively tackle environmental challenges, innovative new renewable energy sources are required to complement the clean air and climate benefits offered by traditional propane.”

John Rulfs ADK Farms

Jon Rulfs | CEO

ADK Farms

green ADK Farms logo

“Farmers are the original stewards of the land, and we do our part to reduce greenhouse gas emissions. At Adirondack Farms, we constantly evolve and innovate to ensure we remain viable in a competitive marketplace while preserving of our natural resources. Our partnership with Suburban Renewables provides us with the tools needed to take our recycling efforts to a new level, resulting in the production of renewable natural gas.”


Harnessing the power of organic matter

There are over two thousand biodigester sites in the United States.1 Dairy farms across the country are using biodigesters to reduce greenhouse gas emissions and create revenue opportunities.

A biodigester is a device in which organic waste matter is digested by bacteria to produce biogas and a nutrient-rich slurry. The nutrient-rich slurry is used as fertilizer and the biogas is either burned directly in an electric generator to produce renewable electricity or it is processed into renewable natural gas (“RNG”). RNG is a drop-in replacement for natural gas that can be blended with existing natural gas and moved through the existing natural gas transmission and distribution system.

biodigester machines
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Anaerobic digestion takes place in an oxygen-lacking (anaerobic) container with temperatures and conditions favorable to microorganisms, the powerhouse of the digestion process. Biodegradable material such as manure, wastewater sludge, food waste, etc. is fed into the system. The microorganisms break down, or “digest” the organic material, creating biogas and digestate. Biogas contains mostly (50 – 75%)2 methane, plus carbon dioxide, hydrogen sulfide, water, and trace compounds. Biogas can be used in place of fossil-based natural gas to generate electricity, heat, or even bioplastics, and can be further conditioned into renewable natural gas and transportation fuels. And the solid and liquid portions of the digestate have many beneficial uses--fertilizer, animal bedding, crop irrigation, soil amendment, sustainable building materials, etc.

Benefits of anaerobic digestion

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Reducing potent greenhouse gases

Methane is 25 times more potent than carbon dioxide at trapping heat in the atmosphere.3 Managing methane from farm operations and manure provides climate benefits.

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Removing odor and pathogens

The digestion process removes odors and pathogens from manure, improving the quality of life for those on the farm and those in surrounding communities.

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Improving solid health

The liquid portion of the nutrient-rich slurry from the biodigester is used as fertilizer helping to improve soil quality and crop yields. The solid potion of the nutrient-rich slurry is used as bedding material for livestock on the farm.

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Multiple end-use applications

Biogas RNG can be injected into the existing natural gas pipelines and used as a sustainable alternative anywhere conventional natural gas is used—electricity, heating, transportation fuel, and much more.

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