At a recent virtual meeting of the USDA’s Northeast Climate Hub Leadership we were invited to speak about our smaller digesters for dairy farms of 200-700 adult cows. Following our presentation, questions were asked about the profitability, amount of greenhouse gas mitigation and operational requirements.
In response we explained that this digester is less expensive because it is slurry only, one-size-fits-all rather than custom, and assembled/constructed above ground rather than in-ground. In addition, increasing environmental payments related to RECs, carbon credits and perhaps eRINS should compensate for the low prices paid for green electricity in most states.
Farms will reduce methane gas by 75%/yr. using the Climate Action Reserve’s Livestock Methane protocol calculation.
Due to past experience the attendees were surprised by the fact this German made system has minimal operational requirements. We explained that this was due to the fact that slurry only digesters are largely manure and manure is a much less problematical feedstock than food waste. A consistent supply of manure stimulates the biogas process and buffers the system against challenges presented by other substrates. (Agricultural Digesters has an available video link upon request to the manufacturer and a farmer/operator discussing that the operational requirements of his manure only system may be…just 15 minutes per day.)
More detail about the medium size digester system is available here:
A Smaller, Affordable, Digester | Agricultural Digesters