The aim is to develop a compact high-performance biogas plant that uses a new type of fixed-bed fermenter to produce biogas from different feedstocks with a methane content of at least 70% in a much shorter process (compared to conventional processes) in a decentralized and flexible manner. Furthermore, investigations are being carried out into the biochemical conversion of combustion gas from a combined heat and power plant and electrochemically produced hydrogen (from surplus renewable electricity) into methane. This will be realized in a newly developed high-performance fixed-bed gas fermenter in order to minimize theCO2 emissions of the downstream combined heat and power plant. A system for treating the process wastewater is also being developed, whereby the minerals contained in the process wastewater (e.g. phosphate) are recovered and used for the production of natural fertilizers, for example. The "salt-free" process wastewater thus achieves a quality that can be discharged into the wastewater system.
The measures presented here - incineration waste gas utilization and treatment of the process waste water - serve to realize ecological and environmentally friendly material cycles.
