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  • Generating gas from waste

    Our biogas facilities use municipal biological waste, energy crops and natural fertilizer.

    These organic substances are supplied to us by farmers or local authorities with whom we cooperate closely. We not only generate energy from biogas, but also prepare it for feeding into the natural gas grid. Furthermore, we take on the planning, realization and operation of plants for recycling of materials in the form of energy and the generation of biogas.

    The biogas we use comes from the fermentation of organic matter. This involves organic waste, energy crops such as maize, or agricultural residues such as natural fertilizers. In our combined heat and power plants, biogas is used to generate electricity and heat.

    We are responsible for the entire process of generating energy from biogas, from preparation to generation and supply.

    Preparation

    Delivery of solid and liquid biomass such as slurry, manure, energy crops (e.g. knotgrass) and organic waste (e.g. residues from the foodstuffs industry).

    In some plants, the biomass is first mixed (homogenization).

    If biogas plants process substrates of animal origin, the installation of a hygienization stage is essential. The substrate must then be heated to a temperature of at least 70 °C for at least one hour. The germs are killed in this way.

    Power generation

    In a fermenter, the biomass is degraded by microorganisms in the absence of light and oxygen. The biogas is produced from this fermentation process.

    The biogas, which contains combustible methane, is desulfurized and dehumidified.

    Heat and electricity are generated in a combined heat and power unit (CHP) consisting of an internal combustion engine (biogas engine) powered by biogas.

    The waste heat of the biogas engines from engine cooling and exhaust gas is used to heat the fermenter, to supply heat to buildings or to dry the fermentation residue.

    Power supply

    We feed the electricity generated into the public grid.

    We supply hot water to private and public buildings as local or district heating for space heating purposes or for water heating.

    We market the high-quality and transportable fertilizer from the fermentation residues in agriculture.