Pre-treatment for anaerobic digestion


 Input material:

  • Maize silage
  • Biowaste from agriculture
  • Wheat
  • Straw
  • Green waste (i.e. hops)


 Output material:

  • Open fiber material optimal for anaerobic digestion


 Features of output product:

  • Open fibers
  • Low density
  • Small particle size
  • High homogenity


The lignocellulose rich material as straw, wheat and maize silage are mechanically crushed into fibers through the Promeco Bioextruder ©, to increase their surface area accessible to the bacteria. This treatment is necessary before AD to destruct the lignocellulosic structure and to release sugar contained in the biomass.




Advantages of the treatment with Promeco Bioextruder


Increasing of the digestion of maize silage of over 40% (considering 12 days’ retention time). The study has been carried out by the University of Linköping, Sweden.

To produce 1 MWh power 18.000 ton/year of extruded maize silage are needed instead of 25.000 ton/year of unextruded material.



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Maize silage



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Materials to be recycled

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Engineering  for waste recycling

Complete plant engineering


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Promeco spa
Via Tevere 51
22073 Fino Mornasco (CO) Italy
phone +39 031 267331


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