Process of „Bioextrusion by LEHMANN®”

- Dintegration process -

The disintegration process Bioextrusion was developed by us and is based on hydrothermal (thermo-mechanical) disintegration and has proven its worth for material and energetic usage of fiber plants.
During the process the substrate is decomposed into its cell structure by a double-screw extruder with pressure with that high temperature and  resulting of alternating load and multiple pressure/relaxation cycles in the machine.
The biogas yield increases due to a better biochemical-availability and a strong enhanced surface area. The fiber is ideal culture medium of metabolizing bacteria.

 

This leads to the formation of new bacteria stains and an improved C/N-ratio, because celluloses and hemicelluloses is decomposed and liberated from the embedding lignin layer.  The 5- and 6-times sugar is faster available. Low-molecular and fast transforming substances like alcohol and other compounds develop. 



Lignocellulose substrate -until now only limited usable- no problem for biogas plants

The sustainability and efficiency of biogas production is primarily determined by the substrate costs. It is necessary to exploit new substrates and to increase the energetic utilization ratio of the used substrates. Till now, highly lignocellulosic substrates or residues like straw or landscaping residue materials as “not or limited usable for biogas production”.

The raw fibre is also degradable by bioextrusion. The fermentable organic dry matter (FoDM) will be transformed by 100% and the max. organic dry matter (oDM) will metabolized.
The high lignin content, but also the distinct pith structure with cavities and layers of fat are not an obstacle to their use in biogas plants, since the substrate tends no longer to float.

 

The Fraunhofer institute IKTS in Dresden and LEHMANN Maschinenbau GmbH Jocketa have investigated to to what extent these difficult substrates are suitable for biogas production:
It depends on the proper disintegration.

 


Read also the following professional article

2012-10_Landtechnik-Stroh_statt_Feldfruechte.pdf

"Straw instead of field crops", Landtechnik, 05/2012

2.2 M

Extruder series for research and small industrial use

  mode of drive
E- Motor
OUTPUT
material
OUTPUT
performance* [t/h]
dimension
L x W x H [m]
weight
[t]
Laborextruder 3 kW biomass dep. material 1,0x0,5x1,2 0,25
MSZ B 15e 15 kW biomass dep. material 2,2x1,0x1,3 0,9
MSZ B 22e 2x11 kW biomass dep. material 2,7x0,9x1,3 1,2

Extruder series for industrial and agricultural use

  mode of drive
E- Motor
OUTPUT
material
OUTPUT
performance* [t/h]
dimension
L x W x H [m]
weight
[t]
MSZ B 44e 2x22 kW Biomasse 1,8 - 3,5 3,9x1,1x1,2 3,1
MSZ B 60e 2x30 kW Biomasse 2,0 - 4,5 4,5x1,0x1,3 3,8
MSZ B 74e 2x37 kW Biomasse 3,0 - 7,0 4,1x1,2x1,3 4,1
MSZ B 110e 2x55 kW Biomasse 4,5 - 9,0 4,9x1,4x1,3 6,2

Bioextruder – heavy-duty- series- for wet substrates


for the digestion of  organic waste, wet waste, soaked manure, rich-textured sludge, old potatoes, apples, aqueous slaughterhouse meat, bones and communal waste. The extended, expanded line of bioextruders enhances the degree of digestion
As the wet commodity enters the extruder it comes to a segregation/eduction of water through a sieve filter and worm gear for example into a receiver tank or after-fermenter. The dry substrate has a higher friction and will stable defibred.

 

Significant advantages of Bioextrusion

  • An increase in biogas productivity and a higher degradation of 10-40% in biogas plants.
  • The input of a specific comminution energy of max. 10% of the surplus amount. Not included is the low agitation energy due to the shorter holding time, better controllability of the substrate and lowering of the viscosity.
  • Plants with a low cqapacity can convert more substrates and produce more biogas (enhancement of the digester chamber load).
  • The construction of smaller and compacter plants; the retrofitting of the existing plants.   
  • The usage of up to now difficult to use substrates with a lignin and dry mass content.

Application possibilities of the extruder

  • for thermo mechanical disintegration
  • for exterior wall agglomeration
  • for plastification / compacting
  • for mixing / compounding
  • for dewatering / substance separation (amino acid- lactic acid separation)
  • for conversion of biomasse (hydrothermal conversion) for alcohol production or HTC
  • for food pellet production for pigs, chicken and small animals

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