When organic waste is sent to landfill, it decomposes and releases methane, a potent greenhouse gas. Anaerobic digestion is a process that converts organic waste under controlled conditions into bio-methane, which can be purified to become renewable natural gas. Greenfield works closely with partners, suppliers, and municipalities to find ways to convert municipal and industrial waste into renewable natural gas — addressing two vexing societal problems at the same time.


Learn more about our projects:


  • In collaboration with municipal partners, we have developed a large-scale anaerobic digester adjacent to our Varennes ethanol plant to convert organic waste into biogas (methane and CO2).
  • The enterprise is known as Société d’économie mixte de l’est de la couronne sud (SEMECS).
  • This project will remove 40 000 metric tons of organic waste each year from local landfills.
  • The biogas is piped into Greenfield’s ethanol plant, thereby significantly lowering the carbon intensity of the ethanol produced.

Advanced Anaerobic Digestion Technology

  • In Chatham, Ontario, we are developing a new advanced anaerobic digestion (AD) technology that accelerates the process of turning waste into renewable natural gas and hydrogen.
  • Greenfield’s patented technology accelerates the AD process, and can handle a much higher organic loading rate than conventional anaerobic digestion systems, thereby producing bio-methane with less energy, and with a smaller footprint than traditional AD systems.

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