Community Research and Development Information Service - CORDIS


3A-BIOGAS - Three step fermentation of solid state biowaste for biogas production and sanitation, Final Publishable Report

Project ID: ENK6-CT-2002-30026
Funded under: FP5-EESD


Most of the organic material containing high dry matter percentage is treated in an aerobic way like composting. Regarding process energy balance in this biological treatment at least mechanical power has to be added for periodic turning of the substrates. Secondly it is impossible to use the energy accruing during the process.
Treating such substrates in conventional liquid biogas plants high volumes of water are necessary, which remain in most cases as wastewater subsequently. In relation to the quantities of feed material, high plant and process energy costs are incurred for material conveyance and maintaining temperatures. Process
The development of the new 3A-biogas batch-process for solid state biowaste can reach the best available synergies of composting and fermentation technology. It combines biogas- and compostproduction including sanitation of the compost. The 3A process itself was patented in 1988 by Dr. Ing. Heinz Steffen as a discontinuous procedure.
The biological decomposition takes place during three operating phases (aerobic, anaerobic, aerobic) in a closed domain without intermediate movement of substrates. The procedure was improved in 1996 by the patented crosswise percolation-water feed. Using the experience gathered in extensive laboratory experiments, the new 3A-biogas batch system has to be up-scaled to prototype size in the project.

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Record Number: 6903 / Last updated on: 2005-06-28
Category: PROJ