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7th of May 2010

More Biogas through “Bioextrusion®”

Author / Source: Summary of press release by FNR 03.05.10

Far more than three years, from 2006 to 2009, intensive tests were carried out on Bioextrusion-technology by the company Lehmann Maschinenbau GmbH in laboratories as well as in praxis. The Federal Ministry for Food, Agriculture and Consumer Protection (BMELV) supported this project through the Agency for Renewable Resources (FNR). The Bioextrusion® technology means, biomass is mechanically crushed through double screw extrusions. Through the water content in the cell structure a hydro-thermal extraction is activated due to high pressure and temperature. This leads to an increase in the surface of cells which improves the fermentation process.

Tested raw materials included dung, maize and grass silage as well as a mix of straw and silages from maize and grass. As a result, yields of methane increased for all extruded substances. In addition, with the help of this technology other substances, like a mix of straw and dung, can be used for fermentation, which are only of limited use at the moment. In detail the results for improved fermentation are different for each substrate, ranging between 11% for poultry dung, 14% for maize silage, 26% for grass silage up to 84% for dehydrated fermentation residues.

Trials at three agricultural plants approved the positive results. Moreover, implementation of this technology is financially rewarding within 2 to 4 years which could be shown by a profitability analysis.

The Bioextrusion® technology won two innovation awards in Germany.

The original press release and final report is available in German language at www.fnr.de



This project is implemented through
the CENTRAL EUROPE Programme co-financed by the ERDF