Vertical reactors


Substrate loading

A frontal loader delivers substrates into the hopper where they are crushed and fed to the horizontal auger.

Supply of substrates

Substrates are transported by means of a horizontal auger to the biomix pump. Here, the substrates are mixed with the biomass from the reactor and pumped back into the reactor.


Biomass inside the reactor is pumped to the external heat exchanger and returned to the reactor. No pipes on reactor walls


Substrates are constantly mixed by the central roof mixer.


Anaerobic bacteria digest the substrates, producing biogas.

Biogas conditioning

Biogas is collected and stored in a gasholder on top of the post-digestor or in an external gasholder. The biogas is then dried in a chiller and pressurized by a gas compressor.


Sulfur is removed by means of an activated charcoal filter. The purified biogas is pumped for combustion into the co-generator.

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Substrate loading
Supply of substrates
Biogas conditioning

Technology Description

The distinctive features of this technology are a reactor with a height greater than the diameter and a central dome mixer. This design provides the best heat and mass transfer. Another positive feature is lower electric energy consumption for stirring.

The substrate is heated in an external spiral heat exchanger. Heat consumption is 2-3 times less compared with a classic reactor where heating is by pipes on the reactor’s walls. The mixer creates a vortex flow, raising the substrate at the walls of the reactor up and lowering it in the center of the reactor. The effective mixing allows more complete fermentation and increased biogas yields.

Vertical reactors are particularly suitable for food industries.

Firstly, vertical reactors take up less space compared to the classical horizontal ones. This is especially important for food industry enterprises, which are usually located in cities and have minimal free space.

Secondly, unlike enterprises in rural areas, industrial enterprises have full-time technical specialists capable of servicing complex but more efficient plants.

Distinctive features:

  • the reactor height is greater than the diameter
  • central dome mixer
  • supply of raw materials by biomix pumps
  • heating using an external heat exchanger
  • sulfur removal by activated charcoal filters
  • biogas cooling in the chiller
1 to 10 MW
power capacity

Suitable substrates:

  • sugar beet pulp
  • brewery spent grains
  • fruit pulp
  • post-alcohol distillery wastewater
  • starch pulp
  • distillery wastewater from citric acid plant

Realized objects


Citta di Castello



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