What is anaerobic digestion?

Anaerobic digestion (AD) uses microorganisms to break down organic materials in the absence of oxygen.

The process produces biogas, consisting primarily of methane. Methane gas is the same hydrocarbon (CH4) as the prime constituent of natural gas. The process also produces a liquid product that contains all the plant nutrients of raw manure, but in more biologically accessible forms.

The anaerobic digestion process can be operated under three conventional temperature levels:

  • at low temperature: psychrophilic, 5°C to 25°C;
  • at medium temperature: mesophilic, 35°C to 45°C;
  • at high temperature: thermophilic, 60°C.

The Bio-Terre process operates at unconventional temperatures in the psychrophilic range from 5° C to 25° C. The process uses bacteria conditioned to thrive in low-temperatures to digest a variety of organic substrates, making it ideal for farm use in North America’s cold climate. Over a decade of scientific research backs the technology. This cost effective process was developed specifically for the North American climate and animal production system.

Each temperature regime has advantages. At high temperature, the microorganisms rapidly break down organic matter, but systems may be more sensitive to upsets due to temperature variations. At low temperature, process stability is high, but the process requires larger digester volume.

The Bio-Terre system operating at low temperature is stable even under large variations of temperature, feeding interval, and loading rate.

Bio-Terre Technology reduces operating costs and improves reliability over conventional anaerobic digester technology.


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