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 collecting

Biogas is collected and stored in a gasholder on top of the post-digestor or in an external gasholder.

Gas conditioning

Biogas is dried in a chiller, pressurized by a gas compressor. Sulfur is removed by means of an activated charcoal filter. The purified biogas is pumped for combustion

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Substrate loading
Supply of substrates
Biogas collecting
Gas conditioning

Technology Description

The distinctive features of this biogas technology are a biogas 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 mixer creates a vortex flow, raising the substrate at the walls of the reactor up and lowering it in the center of the reactor. And heat goes up itself.  Heat and electric power consumption is 2-3 times less compared with a horozontal CSTR biogas reactor where heating is by pipes on the reactor’s walls  and many side mixers.

Vertical biogas 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 optimal mass- and heat-exchange, thus energy saving
  • requires less space than the horizontal CSTR
  • central mixer, that is easy maintained from outside
  • dry matter inside of the reactor up to 10%
0,3 to 20 MW
power capacity

Suitable substrates:

  • ethanol distillery stillage, vinasse
  • brewery spent grain, draff
  • sugar beet pulp
  • milk whey
  • potato pulp, tapioca pulp
  • city sewage sludge
  • fruit and vegetable pulp
  • paper pulp

Realized objects


Città di Castello



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