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ROTARIA Digestate Heat Exchangers

Heating the digestate with an exterior heat exchanger provides a good and cost efficient alternative to digester heating with heating coils fixed to the inside of the digester wall.


During the pumping intervals, the digestate is directed through the pipe heat exchanger. The pipe filled with digestate has got a jacket filled with heating water. On the path through the heat exchanger, heat energy is transferred from the heated jacket to the digestate.

Advantages of the exterior heat exchanger:

  • The digester content is heated during the pumping process
  • Very even heat distribution in the digester
  • One heat exchanger can heat any number of digesters
  • The external heat exchanger can be fitted later