Reduce substrate costs, increase digester capacity

IMPRA for more biogas

IMPRA: Wet hammer mill for biomass processing and biogas production

IMPRA for more biogas

Reduce substrate costs, increase digester capacity

Technical Data

Drive power
37 - 75 kW
Space requirement for maintenance
Permitted wight
1650 - 9100 kg
10 - 40 m3 /h depending on type
Energy consumtion
2 - 4 kW/m2

Technical details
  • Consistently high degree of disintegration
    of the entire material
  • high impurity tolerance due to separator
  • minimal effort for maintenance and wear
  • low energy consumption
  • high substrate flexibility
  • robust industrial quality from own production
Machine types
Throughput Capacity (m³/h) 10-20 m³/h 15-40 m³/h
Energy consumption (kW/m³) (compensated by savings on pumps and agitators) 2-4 kW 2-4 kW
Dimensions and Weight
Length (approx. mm) 2700 mm 3200 mm
Width (approx. mm) 1200 mm 1200 mm
Height (approx. mm) 2500 mm 2500 mm
Weight (approx. kg) 1650 kg 2550 kg
Motor hammer mill Impra (kW) 37 kW 75 kW
Motor pump (kW) 5,5 kW 11 kW

*completely equipped with switchgear, additive tank, distribution beam, valve technology and pumps. **is compensated by energy savings in pumping and agitating technology of the fermentation section.

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Optimizes of your biogas plant



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Efficiently, the wet hammer mill IMPRA processes only what your biogas plant cannot manage on its own, and thus increases the biomass yield.

Biomass is taken directly from the digester and returned there after processing or fed into the post digester. IMPRA works like a ruminant: the wet shredder and microorganisms together mobilize hard-to-remove nutrients from lignified fibers and other hard-to-digest materials.


Reduce Substrate Costs, Increase Fermenter Capacity, Reduce Load on the Fermentation

Your Advantages

IMPRA Exzenterpumpe

Reduce Substrate Costs, Increase Fermenter Capacity,
Reduce Load on the Fermentation

  • Up to 15 % more biogas with the same raw material input
  • Impra pays for itself after a few years
  • Makes even difficult substrates usable such as grass and manure
  • Typical substrates: clover, silage, dung or straw, crops such as grain, oilseeds, potatoes and beet
  • More output, higher space load possible
  • Energy savings through less viscosity with Impra
  • Better pumping and stirring properties
  • No floating layer
  • Energyefficiency, interval operation enables load management, savings on pumps and agitators

Reliable Operation and Long Durability

  • Robust welded construction for continuous industrial operation (24/7)
  • Made entirely of corrosion-resistant stainless steel
  • Proven many times in practical use since 2011

High Availability with Low Downtimes

  • High contaminant tolerance due to integrated foreign particle separator
  • Minimal effort for maintenance and wear

High Safety of Personnel and Plant

  • Standstill monitoring with door safety lock
  • Discharge hopper with overfill protection
  • Sensors for bearing temperature monitoring

Increase profitability of the biogas plant

Increase your biogas yield

Up to 15% more biogas with the same raw material input, such as manure, silage or even grain residues

Lower energy consumption

The substrate is more liquefied by Impra and can be pumped and stirred more easily in the biogas plant. This saves electricity, which is used for processing.

Robust technology

The core component of the IMPRA process is the wet shredder, which is made entirely of stainless steel except for the wear parts. Depending on the size, the machine is equipped with a 75 or 37 kW motor.

Increase your biogas yield



IMPRA’s goal is the best possible digestion of energy crops as well as residual and waste materials for the efficiency of your plant. With this technology, usable cellulose contained in grass, solid manure and straw is efficiently utilized for biogas production.

Advantages of optimally digested biomass:

  • Biogas yield increased
  • Lower retention times, for better utilization of the available tank volume
  • Less biomass needed
  • Make difficult substrates usable
  • Reduce required acreage by utilizing residues


Save energy

Low energy consumption increases efficiency of the biogas plant

Another advantage of an integrated IMPRA system is the homogenization of the substrate in the digester. The viscosity is extremely reduced and therefore the content is much better stirrable and pumpable:

  • Energy savings in the operation of the agitator and pumps.
  • No floating layers
Setup and function

Structure and function of IMPRA for biogas plants

Grinding chamber for biomass

In the grinding chamber, fast-rotating, hardened beaters crush the substrate. A screening circle completely closes off the grinding chamber. The screen perforation determines the degree of size reduction for the entire substrate, independent of throughput and wear. Different substrates can be accommodated by adjusting the screens. Wear parts can be replaced quickly and easily via two large housing doors.

Separation of impurities protects biogas plant

Impurities are sorted out and collected in the foreign matter catcher. The housing is protected by armored, replaceable wear segments.

Eccentric pumps meter substrate for biogas plant

Two eccentric pumps ensure exact metering of the material and conveyance into any number of containers. The self-regulating conveying system works load-dependently from the main drive and guarantees the always optimal utilization of the IMPRA system.

Case Study

Increase your biogas yield

Case Study IMPRA
Application Biogas

A wide range of solutions for biogas production

Application Biogas
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For your success

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