Zero Waste Energy, LLC.

- Dry Anaerobic Digestion (AD) System


Zero Waste Energy can design facilities for 5,000 TPY to 100,000 TPY of almost any organic material utilizing SMARTFERM proprietary technology.  SMARTFERM is a state-of-the-art dry anaerobic digestion system for organic waste processing. Like other dry fermentation, it is well suited for the production of biogas from stacked solid organic waste in a non-continuous batch process.  Unlike other dry fermentation technologies, SMARTFERM offers a sub-grade percolate tank, which significantly reduces percolate and biogas process piping runs as well as the size of motors and fans to move them.  The sub-grade percolate tank also greatly enhances the overall thermal efficiency of the process.  The SMARTFERM design allows for a thermophilic mode of operation and is offered on two platforms: a shop fabricated steel digester system or as a cast-in-place concrete digester system.


The biogas is collected in air-tight tanks and processed through a combined heat and power engine to produce renewable electricity or further cleaned and processed into transportation fuels such as compressed natural gas ('CNG'). At the end of the digestion cycle, a material commonly referred to as 'digestate' is produced and is generally allowed to mature for a few weeks before being screened, blended, and prepared for use as compost.

Kompoferm Dry Fermentation AD
There are two types of anaerobic digestion, 'wet' fermentation and 'dry' fermentation. Our Kompoferm technology is a 'dry' process.

Wet anaerobic digestion is currently being used to produce biogas in the United States and Canada. These existing systems generally utilize high moisture waste streams such as manure and wastewater treatment plant solids. Wet systems generally require costly pre-processing and a waste stream containing a very low (8-10%) solids content.
Zero Waste Energy's patented Kompoferm 'dry anaerobic digestion system', contains unique features that make it the most cost-effective and productive AD system available:

  • Pre-processing is not required. Dry solids can be in excess of 50% of the input.
  •  The 21 day batch average cycle time compares favorably (up to 25% more productive) than other systems.
  •  Digesters are biologically self-heated through the air system and re-circulation of the liquid percolate through the material, effectively optimizing energy usage.
  •  The liquid percolate contains the necessary biological constituents to negate the use of previously digested material needing to be used to start subsequent batches.
  •  Plants require a smaller footprint than traditional systems, creating opportunities for urban applications, and lowering infrastructure and operating costs.
  •  Odor is controlled through the injection of oxygen into the digester at the end of the process, which helps to strip odors and results in a superior product.
  •  The 'digestate' emerging at the end of the process contains the lowest moisture content of any available system, making it easier to compost through our patented In-Vessel Composting ('IVC') system.

All of these features allow for a much greater portion of the waste stream to be diverted from the landfill, minimizing disposal costs and creating new revenue opportunities in the form of renewable energy and high-quality compost.

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