bert (Biogas Express Reactor Technology) is the AD (anaerobic digester) technology developed by Innsbruck University and commercialised in more than 8 countries to date and I s based on Mesophilic digestion system.
A bert reactor has a unique patented Thermo-Gas-Lift  (TGL) design that offers:

• Free, mixing, heating, desulphurization.
• It can handle a cocktail of waste
  streams
• Produce high volume gas production 15-20% more than single chamber plants and
• has a small footprint due to dual-chamber within a single reactor structure.

Picture 1. Thermal image of material moving inside the bioreactor